Microvitec Series 3 1431/1432, 1451, 2030, 2040 Colour Display Monitor, Series 3 1441/1442 High Resolution Monitor Service Manual

MICROVITEC

SERVICE MANUAL

SERIES

— 3

COLOUR DISPLAY MONITORS

GP0019AA2

MICROVITEC SERVICE MANUAL

INTRODUCTION

The contents of this manual are divided into several sections.

We will now look in some detail at the sections and explain how they are to be used to their best advantage.

Factory Pre-set Adjustments:

Some of these adjustments are very critical, not only from an operational point but also from a safety point. The manufacturer recommends that you read and understand the section fully before making any adjustments.

All pre-set adjustments are included in this section. You are given the prefix for example: Field Linearity VR312. If you are not sure of the location of any pre-set (or component) then you should refer to the section containing PCB or CRT base panel layouts. Once you have located the pre-set, you are then told what effect the adjustment will have on the display.

Removal/Installation (Mechanical Detail):

This section gives information (text and illustrated) on how to remove major service items such as: CRT, Main PCB and Tripler etc.

Description and Operation:

These sections will help you to understand the design concept of the Microvitec 'CUB' Monitor. They give very detailed descriptions of each part of the circuit. For example: Line Timebase. Field Timebase etc. It is very important that you read these sections before attempting any of the fault isolation and repair procedures.

Specification:

The first specification list (1431/1432) contains a full specification; subsequent lists contain only the areas that differ from the first list. For example: the supply is 180-265 volts, 48-64 Hz (excluding 110 volt models). This will only be given on the first specification list. Therefore, unless otherwise stated, refer to specification 1.

Circuit Diagram and Parts Listing:

There are many model variants in the Microvitec 'CUB' range and obviously it would not be practical to supply all the circuit diagrams. We have therefore devised one circuit diagram for the main P.C.B. assembly (including

Standard/Medium Resolution Tube Base assembly) and a separate circuit diagram for the High Resolution Tube

Base assembly. In addition there are no component values on the circuit diagrams: you should refer to the Parts

Listing.

Component location is another problem that you may encounter. To assist you in this matter we have also included a full P.C.B. layout.

Fault Isolation and Repair Procedure:

Configured in a boxed flow chart format, it represents repetitive faults encountered by our own Service Technicians.

Each fault is accompanied by a series of boxes which will ask you to check a particular part of the equipment. After you have carried out the check a question is asked (refer to Fig. 1).

INTERMITTENT -

LINE SYNC

Fig. 1

From the result of the question you can then answer YES or NO.

If the answer is NO (as in this case) you must move onto the next box and carry out the next check.

If the answer is YES. the next box will be (refer to Fig. 2).

Fig. 2

Further into the Fault Isolation Procedure you may be asked to check a component: for example (refer to Fig. 3).

Fig. 3

In this case the best method of checking the Tripler Module would be substitution for a serviceable Tripler Module. This would establish very quickly the condition of the Tripler Module, in relation to the fault.

When all the known fault causes have been effected, the chart wil be terminated by a box reading: (refer to Fig. 4).

Fig. 4

If you have reached this stage you should use the circuit diagram and items of test equipment and adopt a logical method of fault isolation and repair.

Illustrated Parts Listing (I.P.L.)

This section contains ail current cabinet designs in the Microvitec 'CUB' monitor range. It is intended to show the service technician how to gain access to the equipment for repair purposes. In addition component part numbers accompany each illustration; this will assist you when ordering a component part.

TECHNICAL SPECIFICATIONS

1.

MODELS - 1431/1432

SYSTEM

SUPPLY

TIMEBASE (LINE)

FRAME FREQUENCY

POSITIONAL ERROR

CONVERGENCE ERROR

EHT

EHT REGULATION

LINE FREQUENCY

DEGAUSING

BANDWIDTH

RESOLUTION

DOT PITCH

CRT

INPUTS MODEL 1431

MODEL 1432

INPUT CONNECTOR

OPERATING TEMP

POWER CONSUMPTION

1 : 625 lines, 50 fields interlaced or 31 2/313 lines, 50 fields non interlaced

2 ; 525 lines, 60 fields interlaced or 262, 263 lines. 60 fields non-interlaced other non-standard systems may be suitable consult MICROVITEC PLC.

Nominal 180 - 265V, 40 to 64Hz

Pull-in range 15 to 16KHz

50Hz - Pull-in range 45 to 65Hz

+ or -3%

0.6mm screen center

1.6mm screen edge

24KV approximately

+ or -1KV

15.625KHz

Automatic at switch ON

18MHz

452(H)x585(V) elements

0.64mm

Rectangular 335.4mm (screen diagonal) 90 deg deflection.

Precision in-line gun vertical stripe screen, high voltage focus

TTL compatible; 1500 ohm R, G, B inputs link selectable, positive or negative video

Linear; 0 to 4V 1500 ohm R, G, B inputs.

Positive video, composite or separate line and field synchronisation - each link selectable positive or negative

10 pin in-line 'SYSTEM 25' Pressac

0 to 55 deg C (max) open chassis

-10 deg C to +40 deg C (max)

65 Watts approximately

2.

MODELS 1441 AND 1442 14" HIGH RESOLUTION

NOTE: As models 1431 and 1432, with the following exceptions:

CONVERGENCE ERROR (MAX)

EHT

BANDWIDTH

RESOLUTION

DOT PITCH

POSITIONAL ERROR

CONVERGENCE ERROR

0.3mm screen center

0.8mm screen edge

Approximately 24KV

18MHz

895(H)x585(V) elements, rectangular 333mm (screen diagonal)

Automatic degausing at switch on. High focus voltage in-line gun.

90 deg. diagonal deflection, 0.31mm dot pitch black matrix screen with pigmented phosphors.

0.31mm

+ or -2%

0.8mm screen edge

3.

MODEL 1451


RESOLUTION

DOT PITCH

CONVERGENCE ERROR

652(H)x585(V)

0.43mm

1.2mm screen edge

4.

MODEL 2030

5.


CONVERGENCE ERROR (MAX)

RESOLUTION

DOT PITCH

CRT

POWER CONSUMPTION

MODEL 2040

0.4mm screen center

1.8mm screen edge

505(H)x585(V) elements, 80 characters on 6 dot, wide matrix

0.8mm

Rectangular 480mm (screen diagonal) 90 deg deflection precision in-line gun vertical stripe screen high voltage focus


NOTE: As models 1431 and 1432. with the following exceptions:

RESOLUTION

DOT PITCH

POSITIONAL ERROR

POWER CONSUMPTION

CONVERGENCE ERROR

940(H)x705(V)

0.47mm

+ or -4%


1.0mm screen edge

ELECTRICAL SUPPLY

Warning

THIS APPARATUS MUST BE EARTHED.

Important

The wires in the mains lead are coloured in accordance with the following code:

GREEN AND YELLOW EARTH

BLUE

BROWN

NEUTRAL

LIVE

As the colours of the wires in the mains lead may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows:

1. Earth

The wire coloured GREEN and YELLOW must be connected to the terminal marked 'E' or by the safety earth symbol or coloured GREEN, or GREEN and YELLOW.

2. Neutral

The wire coloured BLUE must be connected to the terminal marked 'N', or coloured BLACK.

3. Live

The wire coloured BROWN must be connected to the terminal marked ‘L’, or coloured RED.

X-Ray Radiation

X-rays constitute a health hazard on prolonged exposure at dose range unless adequate shielding is provided.

Precautions must be exercised during servicing of display equipment to ensure that the anode voltage and other tube voltages are adjusted to the recommended values.

Replace with a tube of the same type number or recommended replacement to assure continued safety.

Implosion Protection

This tube employs integral implosion protection and must be replaced with a tube of the same type or a recommended replacement to assure continued safety.

Shock Hazard

The high voltage at which the tube is operated may be very dangerous. Extreme care should be taken in the servicing or adjustment of any high voltage circuit Caution must be exercised during the replacement or servicing of the tube since a residual electrical charge may be contained on the high voltage capacitor formed by the external and internal conductive coating of the tube funnel. To remove any undesirable residual high voltage charges from the tube, "bleed off" the charge by shorting the anode contact button, located in the funnel of the tube, to the external conductive coating before handling the tube.

Tube Handling

Wear heavy protective clothing, including gloves and safety goggles with side shields. Handle the tube with extreme care. Do not strike, scratch or subject the tube to more than moderate pressure. Particular care should be taken to prevent damage to the seal area.

OPERATING SAFETY

We recommend — after effecting any Service and/or replacement of any part of the monitor, or after any repair work

— that the SAFETY CHECKS listed following are carried out.

Note

Ensure on re-assembly that ALL earth connections are replaced SECURELY; in particular safety earths and the 'P' band and dag earth 'CRT' earth connections.

Important!

Failure to observe the points noted could affect your own safety, the product's safety and ultimately, that the user.

SAFETY CHECKS

Earth Continuity Check

a) Using a suitable multimeter:

Check between 'Dag' earth on the CRT and mains plug earth pin, (safety earth connection). The reading should be less than 470Kohm (with tube discharged).

b) Check mains earth continuity between mains plug earth pin and:

1) CRT 'P' Band

2) PCB 'Earth' pin on main chassis c) The final assembly/housing should be checked for continuity between the mains plug earth pin and ALL exposed metalwork.

Note

Tests b) and c) should have a resistance of less than 0.5 ohm.

High Voltage Isolation/Insulation Checks

a) On the mains supply 3 pin plug, — check between 'live' and 'neutral' to 'earth' for leakage breakdown.

This test should be made with 1.5KV to 1.6KV AC or DC equivalent.

On Test

1) No breakdown should occur.

2) Earth leakage should be less than 6mA at 1.5KV.

b) Insulation resistance should be greater than 2Megohms at 500V DC.

CAUTION

A MONITOR FAILING ANY OF THE ABOVE CHECKS MUST BE RESTORED TO SAFE WORKING

CONDITION BEFORE BEING RETURNED TO THE USER.

SAFETY STANDARDS

SAFETY AND ISOLATION

UNDER NO CIRCUMSTANCES SHOULD ANY FORM OF REPAIR OR MAINTENANCE BE ATTEMPTED BY

ANY PERSON OTHER THAN A QUALIFIED ENGINEER.

Switched Mode Power Supply

Although the outputs from the power supply are isolated from the incoming mains supply, the bridge rectifier and the ontrol and regulation circuit ARE NOT isolated. Therefore, when servicing the power supply section of the chassis assembly, the SMPSU should be supplied by a MAINS ISOLATION TRANSFORMER OF AT LEAST

300VA RATING.

HANDLING PRECAUTIONS HT

Electrical Charges

The power supply section remains charged with respect to chassis for 30-60 seconds after switching off. Care should be taken when handling the chassis to avoid touching this area during this time.

EHT Charges Horizontal (Line) Output Stage/CRT

Before handling or attempting adjustment or replacement on the horizontal (line) output stage or on CRT areas — always discharge the final anode of the CRT — by using a suitable EHT probe only. Do this by connecting first to

CRT dag earth coating/earth braid assembly, and then to CRT final anode/anode button 'poppy' connector.

Please Note

Very considerable electrical charges can be stored in these areas even for lengthy periods of time after 'switch off'.

In the interests of your personal safety observe the precautions listed.

SAFETY CRITICAL COMPONENTS

Components marked on the parts list and circuit diagram are safety approved types and they should be replaced only with components supplied or approved by our Service Department It is also recommended that the components not marked with the safety symbol should be replaced by parts of the type originally fitted, and this applies particularly to those resistors which are stood off the printed circuit boards.

HANDLING PRECAUTIONS STATIC ELECTRICAL CHARGES

Depending on equipment type and model, the equipment may contain devices which may be damaged by static electrical charges during handling. Generally, these devices are indicated by a symbol.

When replacing or handling these devices or PCBs containing such devices, care should be taken. Soldering irons should be earthed and personnel should use wrist straps earthed via a 1Mohm resistor. If the latter is not practicable they should discharge themselves of any static electricity by touching an earthed point

Static sensitive devices should be packed in suitable conductive containers. Note

Electrostatic discharge does not necessarily 'kill' a component completely — more likely it will 'wound' it

Many static wounded devices will pass normal test both on site and in Service Workshops. In this respect

PCBs containing such 'wounded' devices are a major cause of 'no fault found' problems.

It pays, therefore, to cultivate static safe ways when dealing with such static sensitive equipment

______________PRESET CONTROL ADJUSTMENT______________

GENERAL

Preset controls are initially set up at the factory and normally do not require adjustment unless a change is required in the input configuration — for example, typically to install a different graphics adaptor card in the associated host system. Details of the preset controls with their use and adjustment is described following:

PRESET ADJUSTMENTS

TO PROTECT AGAINST ELECTRICAL SHOCK HAZARD AND TO PROTECT THE MONITOR AGAINST SHORT

CIRCUIT AND DAMAGE — USE ONLY AN INSULATED NON-METALLIC TRIMMING TOOL TO MAKE AD-

JUSTMENTS TO THE PRESET CONTROLS.

Care should be taken when adjusting presets. Adjust only one at a time and note carefully the effects of the adjustment before proceeding on to other adjustments. In some cases, it may be advisable to take note of the original setting position of the preset BEFORE adjustment in case the need arises to return to the original setting.

INTERCONNECTION COMPATIBILITY

On installation and prior to preset adjustments, ensure that video and sync connections from the host system are compatible with: a) The monitor.

b) The interconnecting lead assembly in use.

Having determined these points are correct, proceed with the adjustments required according to the details given in the accompanying table and descriptions following.

PRESET CONTROL SETTINGS

1. To set the preset controls, use a signal generating a display occupying as large a screen area as possible.

For example a full page of upper case letter 'H' would be suitable, or alternatively a suitable test card as appropriate.

2. Preset controls in the table following marked with an asterisk * may be adjusted if required.

However, normally this should not be necessary, as these presets are set accurately at the factory during manufacture.

NOTE: A circle is employed in the screen displays illustrated following, only to demonstrate more clearly the geometric effects of wrong settings.

PRESET LOCATIONS

The physical locations of most of the preset controls referred to in the descriptions following are shown in the illustration contained in the Section preceding.

Notable exceptions are preset controls contained on the TUBE BASE PCB assembly.

The positions of these presets are indicated on the individual PCB's by appropriate ident markings.

PRESET

LINE FREQUENCY

WRONG X

FIELD FREQUENCY

HEIGHT

WIDTH

LINE PHASE*

FIELD LINEARITY*

(VERTICAL

LINEARITY)

EAST/WEST*

CORRECTION

FIELD SHIFT

TABLE OF PRESET ADJUSTMENTS

RIGHT /

INPUT CONNECTIONS AND CUSTOMER CONTROLS 1. T.T.L.

Compatible/Linear input Selection

A. T.T.L. compatible or linear (0 to 4V, 1500 ohm) input level options can be selected by moving 3 links: (1)

TL103 R,G,B located on main PCB: position 1 corresponds with linear levels position 2 with T.T.L. levels

NOTE: Contrast control VR111, inoperative when position 1 is selected.

2. Synchronisation - Input Options

A. Sync inputs must be T.T.L. compatible, the timing of sync pulses should approximately correspond with those used for broadcast purposes (refer to fig. 1 for available options.)

3. Inverse Video

A. To facilitate inversion of T.T.L. compatible video input signals by either moving link TL101 on main PCB to position 1, or removing TL101 and feeding a positive T.T.L. level in to pin 9 of PL101.

NOTE: Monitors are normally despatched wired in composite negative (going) syncs mode, with TL102 not fitted, and TL106 selected to position 1.

Signal input pin connections

Fig. 1

KEY

1 = +12V

2 = No connection

3 = Sync 3; -field sync

4 = Red video

5 = Sync 2; -field sync

6 = Green video

7 = Sync 1; composite sync or line sync

8 = Blue video

9 = Normal/inverse

T.T.L. video

10 = Ground

4. Synchronisation Options

SYNC OPTIONS INPUTS (PL101)

INPUTS (PL101) SYNC OPTIONS

MIXED

-ve going pin 7 pin 7

+ve going

SEPARATE

-ve line

-ve field

+ve line

+ve field

-ve line

+ve field pin 7 pin 5 pin 7 pin 3 pin 7 pin 3

LINK POSITION

LINK POSITION

TL102 not fined

TL106 in position 1

TL102 fitted

TL106 in position 1

TL102 not fitted

TL106 in position 1

TL102 fitted

TL106 in position 2

TL102 not fitted

TL106 in position 1

5. Customer Controls

NOTE: On 'D' series monitors the controls listed below are located on the front of the monitor, concealed behind a downward hinging door.

A. ON/OFF Switch

(1) Mounted rear of the monitor, allows mains to be switched on and off without switching the mains supply off.

B. Contrast/Brilliance Adjustment (VR111)

(1) Mounted rear of main PCB, only active in T.T.L. mode, and allows video gain to be varied from maximum to minimum, at black level.

C. Brightness Adjustment (VR134 when fitted)

(1) Mounted rear of main PCB, next to VR111. Active in all modes of operation allowing brightness of display to be varied above or below cut off.

D. Volume/Audio Adjustment (when fitted)

(1) Mounted rear of the monitor, allows user to adjust volume/audio level of the monitor. Clockwise to increase, anti-clockwise to decrease.

E. Colour Saturation Control (when fitted)

(1) Mounted rear of the monitor, allows user to adjust the colour level of the monitor. Clockwise to increase, anti-clockwise to decrease.

FACTORY PRESET ADJUSTMENTS

NOTE: Certain preset adjustments can be from above or below main panel. Adjustments are best made on a static display, preferably a MICROVITEC test card, details of test equipment are available on application.

1. Set HT VR4

A. Adjusted accurately at the factory to give 124V with a dark picture on, R138/137 (right hand side) 5, and should not be re-adjusted.

WARNING: THIS IS A CRITICAL SAFETY ADJUSTMENT, FAILURE TO COMPLY WITH THE ABOVE WILL

INVALIDATE THE WARRANTY.

2. Line Frequency VR218

A. Set free running oscillator frequency to almost frequency of incoming line syncs.

B. Adjust VR218, feed monitor with R,G,B video and interrupt the mixed sync information to line oscillator by removing sync information on PL101, (sync 1, 2 or 3 etc).

C. Adjust VR218, until picture almost stabilizes then re-connect via PL101 as required. Resulting in a stable picture lock.

3. Field Frequency VR307

A. Control of free running field oscillator frequency is achieved by VR307 being adjusted to give a stable picture lock. For effective lock VR307 should be set to centre of locked picture range.

4. Line Phase VR220

A. VR220, controls positioning of video information relative to raster in line scan direction. B. Ensure the following operations have been effected:

(1) The line frequency has been set (VR218)

(2) The picture width has been set (L202)

(3) The monitor is positioned in its place of use.

NOTE: VR220 when adjusted will shift the picture, right or left.

5. Width L202

CAUTION: CARE SHOULD BE TAKEN WHEN ADJUSTING THIS COMPONENT DUE TO ITS

PROXIMITY TO EHT SECTION. IN PARTICULAR, TRIPLER AND LINE OUTPUT

TRANSFORMER.

A. Using a non-metalic trimming tool adjust L202, to effect picture width adjustment.

6. Height VR306

A. VR306. when adjusted will provide for raster under scan and over scan.

7. Field Linearity VR312

A. Adjust VR312, to give a linear picture in vertical direction.

NOTE: Best results are obtained by using a cross hatch type grid or MICROVITEC test generator.

8. Field Shift VR321

A. VR321, controls positioning of raster in field scan direction.

9. East-West Correction VR328

NOTE: Some models will not require this adjustment, because east-west correction is integral on certain types of CRT.

A. Adjustment of VR328 will achieve straight verticals on left and right hand sides of pictures.

10. Focus

A. Located on end of tripler module, set brightness control to normal viewing level, then make focus adjustment.

11. Adjust Colour Background Controls (black level)

NOTE: These controls are factory preset. If adjustment is necessary, an AVO 8 multimeter and/or oscilloscope will be required. However, best results are obtained by using an oscilloscope.

A. Prepare to adjust colour background controls

(1) Set customer contrast (VR111), brightness (VR134) and A1 (VR932) fully anti-clockwise

(2) Disconnect R,G,B, sync inputs

B. Adjust red, green and blue

(1) Adjust VR9O6 for red cathode (black level) volts

(2) Adjust VR914 for green cathode (black level) volts

(3) Adjust VR921 for blue cathode (black level) volts

(4) The above voltages are:

(a) 150V-14" monitor (TTL or Linear)

(b) 155V-20" monitor (TTL or Linear)

(c) 140V-12"/14" high res monitor (TTL or Linear)

C. Adjust A1 voltage

(1) Adjust VR932 until a raster is just visible.

(2) Raster colour may be neutral. However, it is very likely shaded towards-red, green, blue or a combination of any two colours.

(3) Establish raster colour shading as follows:

(a) Red and Green • Yellow

(b) Red and Blue - Magenta

(c) Blue and Green - Cyan

(4) Reduce black level of remaining one or two guns using VR906, VR914, VR921 or combination until a neutral raster is achieved.

(5) Re-adjust VR932 to just extinguish raster

(6) Input - R,G,B and sync signals, then adjust VR111 clockwise

(7) If correct white balance has not been achieved, repeat operations C. (1) thru (6).

12. Adjust Colour Gain Controls

CAUTION: MAKE THE FOLLOWING ADJUSTMENTS USING A DC COUPLED OSCILLOSCOPE ONLY. A.

Prepare to adjust colour gain controls

(1) Disable beam current limit circuit, by removing TL901 in series with CRT heaters on tube base panel.

(2) Provide a test pattern with peak white and black level information on red, green and blue.

(3) Ensure VR111 is fully clockwise to provide maximum drive voltages to video output stages.

B. Adjust red, green and blue gain controls

(3) Adjust VR903, for red peak to peak drive volts at R926.

(2) Adjust VR910, for green peak to peak volts at R925.

(3) Adjust VR916, for blue peak to peak volts at R924.

(4) Above voltages are:

(a) 70V p-p on 14" monitor - TTL mode

(b) 70V p-p on 20" monitor - TTL mode

(c) 60V p-p on 14"/20" monitor - medium and high resolution

REMOVAL/INSTALLATION DETAILS

WARNING: ENSURE MONITOR IS DISCONNECTED FROM MAINS ELECTRICAL SUPPLY BEFORE

EFFECTING THE FOLLOWING OPERATIONS.

1. Main PCB Removal/Installation (Fig. 1)

A. Disconnect EHT lead (1) from CRT, to ensure no charge remains on tnpler connect to chassis metalwork.

B. Discharge CRT, final anode by connecting it to CRT dag.

C. Disconnect PL201 (2), PL1 (3) and on cabinet versions PL2 (4) (if fitted) and mains plug PL3.

D. Remove tube base panel and CRT earthing braid tag.

E. Remove 'P' band earthing tag (5) from main PCB, located next to tripler module.

F. Release in turn, each of the nylon self locking PCB support clips (6), lifting PCB slightly in each case.

G. Disconnect PL101 (7), PL102 (8), then disconnect tube base from CRT.

H. The main PCB may now be removed by lifting upwards, and withdrawing from the rear.

J. For installation effect the above operations in reverse order.

Removal/Installation Details Fig. 1

CRT Removal/Installation

Fig. 2

2. CRT Removal/Installation (Fig. 2)

A. Effect operations 1.A. thru G., then position monitor so that the CRT is face down on two padded support blocks.

B. Remove two earthing screws (1), then refer to the illustrated mechanical parts section and remove the base of the monitor.

C. Remove the four nuts (2) and large washers (3) securing CRT to cabinet facia (4).

D. Carefully withdraw CRT vertically.

E. Transfer degauss coil (5) and earthing braid (6) and scan coil lead assembly (7) to new CRT.

F. Install main PCB assembly by effecting operations 1.A. thru G., in reverse order.

G. CRT installation safety checks.

(1) Check for correct fitting of CRT earthing braid (6).

(2) Ensure black lead from CRT earth braid to tube base panel is connected.

(3) Check 'P' band earth pin has been connected to main PCB.

3. Line Output Transistor (TR202) and SMPSU Output Transistor (TR2) - Removal/Installation (Fig. 3)

A. Remove Transistor

(1) Remove two M3 screws (1) securing transistor and heatsink to main PCB.

(2) Unsolder base and emitter connections on PC3, then withdraw transistor heatsink (4).

(3} Separate transistor from heatsink, retaining insulating bushes (3) and mica washer (2) for refitment.

B. Install Transistor

(1) Coat underside of transistor with thermally conductive heatsink compound.

(2) Effect operations 3.A.(1) thru (3), in reverse order.

Line Output Transistor (TR202) and SMPSU Output Transistor - Removal/Installation

Fig. 3

4. Tripler - Removal/Installation (Fig. 4)

A. Tripier Removal

(1) Remove EHT lead from CRT and discharge CRT final anode to the earth braid.

(2) Unsolder the following: Lead from line output transformer overwind (1) focus lead (2) to tube base panel at the tripler end.

(3) Unsolder from main PCB: Earth return (3) from focus control, clamp diode earth return (4)

(4) Loosen, but do not remove tripler securing screws (5), then withdraw tripler module (6) from main

PCB.

B. Tripler Module - Installation

(1) Position tripler module (6) on main PCB assembly and secure with screws (5).

(2) Solder on main PCB: Earth return (3) from focus control, clamp diode earth return (4).

(3) Solder : Lead from line output transformer overwind (1) focus lead (2) to tube base panel at the tripler end replace insulation sleeve on connection

(2).

NOTE: Ensure all soldered connections are smooth and connecting wires kept as short as possible, to guarantee adequate voltage clearances.

(4) Connect EHT lead to CRT final anode.

NOTE: Replace the insulation sleeve on connection (2)

Tripler Removal/Installation

Fig. 4

TYRAP POSITIONS ON CABINET BACK COMPONENTS

Note: All tyraps to be fully tight

___________MODIFICATION FOR IBM/APPLE INTERFACES_________

(1) Remove TR1 (BC337) and replace with TIP 120 as shown.

(2) Remove R1 (6 K8) and replace with 8K2 1/4 watt 5%.

(3) Race a 10 microfarad 35V electrolytic as follows: (i) negative side, to top of existing

C4 position (ii) positive side, mechanically wrapped around and soldered to left side of R3.

SWITCH MODE POWER SUPPLY - DESCRIPTION AND OPERATION

The power supply is a variable frequency, self oscillating, switching flyback convertor type, providing mains isolation and three stabilised voltages, of 18V, 124V and 200V.

1. Control Circuit - Description

A. Operating Normally In A Ready State

(1) TR2 turns on a step voltage whose amplitude depends on the instantaneous value of rectified mams across T2 primary.

(2) Current in winding and TR2 collector increases in a linear fashion from zero, in which time energy is stored as flux in the transformer.

(3) During this time D22, D23 and D24 are reverse biased and any load energy is supplied by C27, C28.

C31 and C26, from previous cycle.

(4) TR1 performs a control function, supplied from a reference winding on transformer (nominal

+30V).

(5) During 'ON' time of TR2. the emitter of TR1 is held at a constant with regard to reference rail from D18.

(6) The base of TR1 is fed directly from the reference rail, via R3, VR4 and R5, any voltage change on the reference arising from a change of voltage at the main output will vary causing the constant current source, used to charge C16, to vary in sympathy.

(7) C16 charges on the current available from R10. The voltage across C16 increases until it reaches the gate trigger voltage of TY1. Then TY1 conducts and 'crow bars' base drive to TR2.

(8) TR2 ceases conduction and its collector voltage becomes positive. The dV/dT at TR2 collector, is limited by C17, R12 and D17. As this occurs D22. D23, D24 and D21 become forward biased and stored energy within the transformer is transferred into output capacitors, and their respective loads.

(9) Eventually voltages on D6, D21. D22. D23 and D24 anodes, collapses. TY1 is forced off prior to this stage by negative anode voltage, allowing TR2 to turn on. Full base drive is then sustained by R16.

TR2 BASE Fuse in

TR2 BASE START-UP Fuse out

(10) HT stabilisation

(a) HT stabilisation is achieved by controlling the duty cycle of the switching transistor.

(b) Increasing load = increased duty cycle and peak collector current.

(c) Increasing mains supply * increased operating frequency.

(d) HT adjustment is made by VR4.

(e) Extra damping for C14. R6 and D7. are required to limit Vce of TR2. 015 and D16 provide negative off drive and base current tracking, L2 optimises storage time of TR2 for minimum switching losses.

(11) Max available power is determined by measuring, peak collector current of TR2, and is sensed by R15. If voltage across R15 exceeds voltage across TY1 gate cathode, then TY1 conducts turning TR2 off.

NOTE: This sequence occurs during start-up, at low mains and under fault conditions. 2. Start-

Up Procedure

A. Current required at start-up is small compared with base drive current under normal operating conditions.

B. When turn on of TR2 occurs in this manner (once every 20ms) the oscillation becomes self sustaining.

R8 continues to supply current, but is swamped by forward base drive from R16.

TR2 COLLECTOR Fuse in

3. Over Voltage Protection

A. Controlled by a second feedback loop attached to TY1, consisting of:

(1) A zener diode which senses the reference rail voltage and HT voltage proportionally.

(2) If this reference exceeds zener voltage. 020 conducts, fires TY1 and terminates drive to TR2.

During which time enough volts are developed across TY2 gate-cathode to cause conduction, and latch on.

(3) Drive to TR2 is stopped until C23 is fully discharged (10ms).

(4) Power supply is off until the next mains start-up pulse.

4. Short Circuit Protection

A. Short circuit or over current on any output rail represents an increase in stored energy required from T2. therefore an increase in collector current through TR2. detected by R15. Thus TY1 is fired and TR2 turned off.

B. Now operating in 'Burst Mode', that is, the power supply is initiated under normal start-up conditions, but only operates for a few switching cycles when the over current protection comes into operation terminating drive to TR2.

VIDEO INPUT INTERFACE CIRCUIT - DESCRIPTION AND OPERATION

INPUT: Connections are made at PL101-red, green and blue video, sync options 1, 2, 3 and TTL video normal/invert. All inputs are flashover protected by, resistors and diodes. R,G,B drives are split in two ways:

1. Test selectable links TL103, R,G,B.

2. To IC101

Select Position 1: The input stage is in the linear mode, the video is buffered and level shifted by emitter output stages. These provide temperature tracking with TR103, 104 and 105 resulting in a stable black level.

NOTE: In the linear mode only brightness variations of the video information are possible using VR314.

Select Position 2: TR103, 104 and 105 bases are driven by IC101. This option is used when driving from TTL video sources offering primary/secondary colour and black and white drives.

NOTE: In the TTL mode, signal to noise immunity of system is very good. IC101 can be used with negative TTL level video drives (R,G,B), in order to invert video information.

Video inversion is achieved by toggling video polarity select line at. PL101 pin 2 or TL101:

Normal - 0V

Invert - + 5V

TTL Mode: Contrast of video information is tracked by varying available potential across open collector load resistors,

R114, 115 and 116 which are supplied by TR101 from +12V, the base being driven from the contrast control slider

VR111, R112. C101 form a low pass fitter and ensure smooth operation of contrast control.

CRT Beam Current: Information is fed to D117, 118, from a constant current source derived from 124V main HT rail.

As CRT beam current increases D117, 118 junctions become more negative thus; D117 conducts more heavily causing voltage to TR106 base to decrease. R136, C105 filter the signal, the derived voltage is emitter followed and supplies TR103, 104 and 105 emitters directly. Hence increases in CRT beam current, above a preset limit achieving an automatic reduction in picture brightness.

NOTE: CRT beam limiting is preset depending on monitor model.

Brightness of display in all modes is adjusted by. VR134 enabling parallel adjustment of R,G,B and black levels within a + or -20V range from nominal:

400uA - High and medium resolution 700uA - 14" standard resolution TTL/Linear 900uA - 20" standard resolution TTL/Linear

TR102: A fast switching transistor used to derive mixed blanking pulses for flyback blanking of video information. The base is driven from a potential divider/mixer network, from a line flyback pulse and a frame flyback pulse. Line flyback is advanced in phase with C225, to allow for transistor switching delays. D107, holds TR102 in a semi-saturation state.

TR102 COLLECTOR with 10 to 1 scope probe

IC101 is also used to provide the following sync options:

Composite negative sync: Fed in on PL101, pin 7, ensure TL102 in non-active position, allowing pin 2 of IC101, to be pulled high where upon IC101 performs a sync inversion and provides an attenuated positive sync waveform for driving sync separators of IC201, via R201 and TL106.

Composite positive sync: Fed in on PL101, pin 7 with TL102 in its grounded position. IC101, now provides an output in phase with input and of suitable amplitude for driving IC201 directly, via R201 and TL106.

Separate negative line and field syncs: Ensure TL102 in non-active position, line syncs are fed in on PL101, pin 5.

IC101, performs an exclusive OR function, the output being an inverted composite sync waveform.

Separate positive line and field syncs: Fed in on PL101, pin 7 in its grounded position. TL106, is switched over to inverse field option. IC101, provides an attenuated and buffered line sync feed for IC201, via R201. Positive field sync information is fed directly PL101, pin 3 "sync3" input by, TL106(B) and R202.

LINE TIMEBASE - DESCRIPTION AND OPERATION

1. Line Timebase

A. Line oscillator function is based on IC201, providing three outputs:

(1) Horizontal drive pulses for control of line output stage.

(2) Vertical sync pulses compatible with synchronisation of IC301 field output IC.

(3) A sandcastle pulse providing burst gate and clamping information.

NOTE: This facility is only used with IC TDA3301, currently required by '1 volt 75 ohm' linear/PAL input monitors.

2. Sync Separator

A. IC (TDA1180P), incorporates separate noise gated sync separators for line/field syncs, which accepts positive going sync pulses (or negative going composite video) on pins 8 and 9.

B. Output pulses from the line sync separator are used in conjunction with a sync gate to synchronise line oscillator in a phase locked loop circuit.

3. Line Oscillator - Phase Detectors

A. The line oscillator is timed by a network of resistors and capacitors on pins 14 and 1 5 of IC201, used to derive a pulse of suitable mark space ratio for driving line output stages.

B. IC201 contains two basic control loops, each containing a phase detector.

(1) The first phase detector compares output of the line oscillator with the incoming line sync pulse.

Phase detector output on pin 13, is filtered and fed to the voltage control input of the oscillator on pin 15.

(2) The second phase detector, compensates for delays introduced by the line output stage and compares line flyback pulses at pin 6, with oscillator output. Phase detector output consists of a bidirectional current source used to charge/discharge C213 on pin 5. Voltage derived from C213 is used to control a phase shifter, which regulates the phase of the output pulse on pin 3. Pin 5 also provides a 'line shift' function, by offsetting voltage developed across C213. charged from VR220,

R221 and R222 allowing phase shift of + or -1uS, between line scan and video information.

(3) A 7uS gate pulse from the line oscillator, whose phase position is centred around the horizontal sync pulse. The gated pulse is used to control the arrival of sync pulses at the sync phase detector for a duration of 7uS, allowing latching and de-latching of line oscillator. Obtained by a coincidence detector which compares the phase gate pulse with that of incoming syncs.

(4) When the two signals are not aligned, the coincidence detector is used to switch p.l.l. filter into a short time constant mode, giving a high input impedance at pin 12, thus increasing sensitivity and loop gain of oscillator. The phase locked loop now has a low noise immunity but has a very wide capture range. When aligned coincidence detector activates the time constant switch, causing low impedance on pin 12, achieving a lower sensitivity and loop gain, but providing a high degree of noise immunity. During the 'locked' condition the p.l.l. operates with a long time constant.

NOTE: A short time constant mode, can be achieved manually by connecting the output of the coincidence detector on pin 11, to ground. Allowing the oscillator to follow rapid fluctuations in line period, which may occur on some non-standard signals.

4, Line Driver Stage

A. Horizontal drive pulses from pin 3 (IC201), are D.C. coupled to TR2Q1 and used to control driver transformer (T201), providing the impedance conversion necessary to provide 600mA forward base current, for saturation of line output transistor (TR202). Ringing is damped by R225 and C214 at TR201 turn off, thus limiting its Vce to a safe value. HT supply to the line driver comes from main HT supply rail, prior to R231 and HT scan interlock (PL201 pins 5/6; allowing its operation to be checked independently of the line output stage.

IC201 PIN 3 with 10 to 1 scope probe

TR202 COLLECTOR with 100 to 1 scope probe

5. Vertical Sync Output

A. Output of field sync separator is used to drive vertical sync output stage on pin 10 (IC201).

B. In addition, this pulse is used internally to inhibit the first phase detector during the field sync period, thus preventing 'top flutter' as a result of equalising pulses.

6. Sandcastle Pulse

A. Sandcastle pulse is on pin 7 (IC201), used on models with linear interface PCB assembly consisting of two sections.

(1) Upper portion, suitable for burst gate and clamping operations from the horizontal oscillator, thus ensuring an accurate phase relationship with the video information.

(2) Lower portion, derived from a line flyback 'slice' for line blanking

LINE OUTPUT - DESCRIPTION AND OPERATION A. Line

Output

1. L202. L203 and T202 primary, are tuned during the flyback period by C222. This lasts for 11.8/11. 1uS, on 14"/20" monitors.

2. Line output transistor TR2C2, is driven directly from the secondary winding of T201. 'ON' current is controlled by R227, turn off dissipation is minimised by L204.

3. Line linearity correction is provided by L203, which is damped by C217, R230 'S' correction is provided by C218.

4. Field timebase +25V (IC301), is achieved by rectifying a negative going flyback voltage from a secondary winding on line output transformer. A fusable resistor provides CRT protection under possible fault conditions.

LINE SYNC with 10 to 1 scope probe


B. EHT Supply

1. 23.5kV required for CRT is generated by a tripler module driven from a 7.5kV, overwind on T203.

Inductance of the transformer (between primary and overwind), is tuned to the 7th harmonic of the flyback frequency by tripler input capacitance and self capacitance of the overwind.

2. The 'breathing' performance of the display is further improved by deriving a high focus potential from a resistive thick film/substrate potential divider from the EHT. giving rise to a constant bleed current from EHT, thus lowering output impedance of the EHT circuit.

3. An extra input diode within the tripler has its anode connected to the tube base ground and via a beam current sensing circuit to 0V. C223 and a network of resistors provide a load for the diode and effectively damp out ringing which may occur during scan. The resulting 1000V which occurs across C223 is used to generate A1 potential across CRT.

C. HT Supply

1. Derived from the main secondary winding of the switch mode power supply via R231. R231 is chosen to optimise picture breathing performance and offer protection to TR202, during CRT flashover.

FIELD TIMEBASE* - DESCRIPTION AND OPERATION

The field timebase -..":• ;^ s carried out by ;-.:2C* 2>: -.-: - --_ -. ^~~ :. s determined by VR307, R308 and C303.

produ; ~: j '2C.S : .:c .: -'- 3'': at pin 12 - •? - ; • .-.-;;:- s :?

r ved from potential across C305 and C306 as •--••. :ange towards -25Vsupp . . -j - 11- R305 R306 and R301. When field scan is completed the ' COuS pulse discharges

C305 and C306 ready for charging cycle to be restarted.

1. Field Linearity

A. Sawtooth output on pin ? of IC301 via R?13 and ???? field linearity control.

IC301 PIN 1 with 10 to 1 scope probe

2. Field Flyback

A. In order to achieve a short fieid flyback time, a supply voltage larger than required during scan, must be applied to field deflection coils during flyback period. Made possible by using a separate field flyback generator, within IC301.

B. Main HT supply for IC301 is supplied to pin 5 via D302. During flyback the generator doubles the supply on pin 5, the potential on pin 3 is switched from 0V during scan to +25V during flyback The change in voltage occurs on pin 5 via C304 causing potential to double during flyback.

C. D302 isolates pin 5 from +25V supply. When deflection coil field has collapsed and potential across field scan coils has fallen below +25V pin 3 is switched back to 0V and scan cycle resumed.

D. Synchronisation of IC301 is achieved by feeding a positive going) field sync pulse on pin 8 of IC301

!C301 PIN 8 with 10 to 1 scope probe

3. HT Supply for IC301

A. Derived from a scan rectified rail from the line output stage. C305, C306 are fed via VR306 (height control) from scan rectified supply and 12V rail. Proportions of current and associated time constants

R303, C301 and D301 are used to minimise "picture bounce" thus maintaining accurate tracking of the field scan with line scan amplitude during CRT beam current variations, therefore reducing picture

"breathing" effects.

4. Field Output

A. Sawtooth output on pin 1 is applied to output stage (within IC301) and scan output is available from pin 4 to field deflection coils. Current within coils is sampled by R323, then fed back via

R31 7 to the virtual earth input pin 10 of IC301.

B. Gain of output amplifier is set by the ratio of R314 and R31 7. DC operating point by R318 and R316.

IC301 PIN 4 with 10 to 1 scope probe

5. Picture Geometry

A. CRT E-W pincushion distortion is corrected by modulation of line deflection current in

transductor (T202) actively driven by TR301. which is then fed from the parabolic waveform at the top of the S correction capacitor C311. AC gam from the amplifying driver is used to control amount of correction applied to CRT.


CRT TUBE BASE PANEL - DESCRIPTION AND OPERATION

1. CRT Tube Base Panel (Refer to fig. 1)

2. Circuit Description

A. All CRT electrodes are protected by a resistor, capacitor and spark gap.

(1) Scark gaps on all electrodes (except focus) are formed by a 1 -2kV ring trap gap, positioned within CRT base socket assembly. High focus voltage has a separate 10kV spark gap contained within tube base socket.

(2) CRT cathodes are stood off from video outputs by 220 ohm resistors, the grid 100k and A1's 820k.

(3) Decoupling of grid and A1's is achieved by C910 and C911.

(4) Focus voltage is provided by a potential divider located within tripler module, providing an adjustable voltage of 5-8KV.

(5) A1 voltage is adjusted by VR932, offering a range of 350-820 volts.

(6) CRT heaters may be disconnected by removing TL901, in order to make video adjustments.

(7) CRT cathodes are directly driven from video output stages mounted on CRT panel.

NOTE: The component values given in this section refer to a standard 14 inch model. For equivalent values, refer to the parts listing.

3. Video Output Stages - Circuit Description and Operation

NOTE: Red, Green and Blue video outputs are identical, the following text refers to the red output stage.

A. TR902 forms a class 'A' amplifier, AC gain is derived from the ratio of R935 to R902. VR903 and DC gain by a DC offset current from R905 and VR906.

B. R904 forms video output load and TR902 represents a low impedance drive source to CRT input capacitance during its conduction.

C. During turn off of TR902. the source impedance of the load R904 is considerably reduced by TR901, ensuring a good 'pull-up' performance.

D. Video compensation is achieved by split capacitances, C902, C903 to help maintain a constant amplifier response curve over the full range of VR903.

E. The emitters of TR902. TR904 and TR906 are connected together with a DC reference of approximately

7.5V, used to set video black level voltage.

F. TR907 performs line and field blanking of video information.

(1) TR907 is driven by negative (going) mixed blanking pulses from TR102. TR907 conducts providing a 7.5V black level reference.

(2) During line and field flyback TR907 is turned off, forcing video outputs off.

(3) Beam current information is sensed on tube base panel resistively, across line output ground to 0V line by R937, D117, D118 on main PCB.

R13

R14

R15

R16

R16

R16

R16

R5

R6

R7

R8

R8

R8

R10

R11

R12

R12

R17

R18/20

R21

R22

R23

R23

R24

R25

R26

R27

R29

R29

R30

R3

R3

R3

VR4

R5

R5

COMP REF

R1

R2

R3

R3

PARTS LISTING SERIES 3 SERVICE MANUAL

MODEL NO.

PART NO.

RK105GKO

RF185JJO

RF393DJO

COMPONENT

DESCRIPTION

100K CARBON COMP. RESISTOR 10% 0.5W AXIAL

180K CARBON FILM RESISTOR 5% 1W AXIAL

3K9 CARBON FILM RESISTOR 5% 0.25W AXIAL

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1449/AS)

(1496/LI2U)

(1486/L12U)

(1241 /AS)

(1446/L12)

(1451/MQ3)

(1446/LF)

RF273DJO

RF363DJO

RF473DJO

RF333DJO

RQ103AL2

RF104DJO





1K PRESET POT CARB. MIN. H MTG 20% 0.1W AXIAL

10K CARBON FILM RESISTOR 5% 0.25W AXIAL

(1441/AL)

(1441 /AS)

(1441/MS)

(1441/MS4)

(1449/AS)

(1486/LI2U)

(1496/L12U)

(1486/LI2U)

(1451/AS)

(1451AP/DS)

(1451/DS)

(1496/LI2U)

(1486/L12U)

(1451/AS)

(1451AP/DS)

(1431/DS)

(1451/DS)

RF683DJO

RF323DJO

RW154XJ 6

RF471DJO

RF333JJO

RF224GJO

RF564GJO

RF392DJO

RF221DJO

RW103XJ5

RW103VJ5

RF274DJO

RF102DJO

R0150LJO

RW472ZJ5

RW103XJ5

RW333RJO



15K WW RESISTOR 5% 7W RADIAL

47R CARBON FILM RESISTOR 5% 0.25W AXIAL

3K3 CARBON FILM RESISTOR 5% 1W AXIAL









1R5 METAL OXIDE RESISTOR 5% 2W AXIAL

470R RESISTOR 5% 1 1W RADIAL


3K3 WW RESISTOR 5% 5W RADIAL

(1441/AL)

(1486/LI2U)

RW103VJ5

RG336GJO

RF394GJO

RF392DJO

RF682DJO

RF104DJO

RF683DJO

RF224DJO

R0470UO

RL470GJO

RF125DJO

RF185DJO

RF684DJO

WL2214TU1


! 3M3 METAL GLAZE RESISTOR VDE/BS415 APPROVED

5% 0.5W AXIAL

39K CARBON FILM RESISTOR 5% 0.5 AXIAL







! 4R7 FUSIBLE METAL RESISTOR 5% 0.5W AXIAL




LINK 5mm x 14mm x 5mm

R140

R201

R202

R203

R204

R205

R206

R207

R208

R112/113

R114-116

R117

R118

R120-123

R124

R125

R126

R127/128

R130

R131-133

VR134

R135/R136

R137

R138

R138

COMP REF

R32

R101

R102-107

R108

R110

VR1 1 1

VR11 1

VR111

MODEL NO.

PART NO.

COMPONENT

DESCRIPTION

(1431AP/MS)

(1431AP/DS)

(1451AP/DS)

(2040/CS5) RF392DJO

RF103DJO

RF152DJO

RF474DJO

RF474DJO

KP0025A05

(1451/AS)

(1441/AS)

(1241/AS)

(1439/AS)

(1431AP/MS4)

(1431AP/DS)

(1435/MS)

(1439/MS)

RQ104CL1

KP0026A08

RF103DJO

RF472DJO

RF632DJO

RF222DJO

RF153DJO

RF472DJO

RF153DJO

RF103DJO

RF222DJO

RF222DJO

RF102DJO

RQ103AL2

RF103DJO

RF185DJO

RF105DJO

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1496/LI2U)

(1486/LI2U)

(1451/AS)

(1451/MS)

(1451/DS)

(1451AP/MS4

(1451AP/DS)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT) RF1850JO

RF474DJO

RF273DJO

RF223DJO

RF686DJO

RF156DJO

RF226DJO

RF394GJO

RF103DJO

RF101DJO



150R CARBON FILM RESISTOR 5% 0.25VV AXIAL

47K CARSON FILM RESISTOR 5% 0.25W AXIAL


PLUG 5-WAY 20/3445

10K PRESET POT CARB MIN 20% 0.15W V.MTG

PLUG 8-WAY PRESSAC 2S/20/3448/BDFH



53CR CARBON FILM RESISTOR 5% 0.25W AXIAL





IK CARBON FILM RESISTOR 5% 0.25W AXIAL




1K PRESET POT CARBON MIN 20% 0.1W H.MTG








6M8 CARBON FILM RESISTOR 5% 0.25W AXIAL






R228/230

R231

R232

R233/234

R235

R236

R237

R301

R302

R303/304

R305

VR306

VR307

R308

R310

R311

VR312

R313/314

R314

R314

R315

R316

R316

COMP REF

R210

R211

R212

R213

R214

R215

R215

R216

R217

VR218

VR220

R221

R222

R223/224

R225

R226

R227

R227

MODEL NO.

PART NO.

(1441/AL)

(1496/L12U)

(1431/DS)

(1439/AS)

(1439/MS)

(2030/CS5)

(2031/CS5)

(203 VAX)

(2032/AM)

(1486/LI2U)

(1451/MS)

(1451/DS)

(1456/LI2)

(1241/AS)

(1241/AT) R0100JJO

RW682PJO

RX1518J6

R0101LJO

RF394GJO

RL101GJO

RF155JJO

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

RF825DJO

RF123DJO

RF363DJO

RF105DJO

RF225GJO

RF104DJO

RF913DJO

RF324DJO

RF224DJO

RQ224AL1

RQ225AL1

RF225DJO

RF155DJO

RF222DJO

RW333LJ5

RX223PJO

RF100JJO

(1241/AS)

(1441/AL)

(1241/AS)

RW220PJO

RF685DJO

RF124DJO

RF475DJO

RF685DJO

RQ475AL1

RQ105AL1

RF155DJO

RF183DJO

RF563DJO

RQ105AL1

RF474DJO

RF155DJO

RF3340JO

RF225DJO

RF184DJO

RF394DJO

COMPONENT DESCRIPTION










22K PRESET POT CARBON MIN 20% 0.1W V.MTG |

220K PRESET POT CARBON MIN 20% 0.1W V.MTG




3K3 WW RESISTOR 5% 2W (PLUG)

! 2K2 FUSIBLE WW RESISTOR 5% 2W RADIAL

1RO CARBON FILM RESISTOR 5% 1W AXIAL


680R WW RESISTOR 5% 4W AXIAL

! 15R FUSIBLE WW RESISTOR 5% 2W8 RADIAL

10R METAL OXIDE RESISTOR 5% 2W AXIAL


! 10R FUSIBLE METAL RESISTOR 5% 0.5W AXIAL


2R2 WW RESISTOR 5% 4W AXIAL










100K PRESET POT CARBON MIN 20% 0.1 W V.MTG







COMP REF MODEL NO.

PART NO.

R317

R317

R318

R313

R320

VR321

R322

R323

R323

R324

R325

R326

R327

VR328

R801

R802

R803/804

R805

VR806

R807

VR808

R309

R810

R811

R811

R812

R813

R

814/815

R816

VR817

R818

R819

VR820

R821

R822

R822

(1241/AS)

(1241/AS)

(1441/AL)

(1441)

(1442)

R823/824

R825

VR826

R827

VR828

R829

R830/831/832

833

R833

RF224GJO

RF183DJO

RQ103AL2

RF223DJO

RF331DJO

RQ473AL2

R0154LJO

RL103GJO

(1441/AL)

(1441/AS)

(1441/MS

(1442 ALL MODELS)

(1241/AS) RL102GJO

RF224GJO

RF183DJO

RQ103AL2

RF223DJO

RQ473AL2

RF331DJO

RK222GKO

(1441/AL)

(1441/AS)

(1441/MS)

(1442 ALL MODELS)

(1486/LI2U)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2) RK105GKO

RF563DJO

RF154DJO

RF184DJO

RF274DJO

RF330DJO

RS103PL2

RF332JJO

RF100DJO

RF333DJO

RF103DJO

RF182JJO

RF152GJO

RF331DJO

RQ222AL2

R0154LJO

RL102GJO

RF224GJO

RF183DJO

RQ103AL2

RF223DJO

RQ473AL2

RF331DJO

RF103DJO

RF472DJO

RF331DJO

R0154LJO

RL102GJO






3R3 CARBON FILM RESISTOR 5% 0.25W AXIAL

1K PRESET POT CARB MIN WW H.VTG 20% 4W

330R CARBON FILM RESISTOR 5% 1W AXIAL




180R CARBON FILM RESISTOR 5% 1W AXIAL



220R PRESET POT CARB MIN 20% 0.1W H.MTG

15K METAL OXIDE RESISTOR 5% 2W AXIAL

! 100R FUSIBLE METAL FILM RESISTOR 5% 0.25W AXIAL



1K PRESET POT CARS MIN H MTG 20% 0.1 W


4K7 CARSON POT CARB MIN MTG 20% 0.1W









1K PRESET POT CARB MIN H MTG 20% 0.1W



4K7 PRESET POT CARB MIN H MTG 20% 0.1W


! 1K FUSIBLE METAL FILM RESISTOR 5% 0.25W AXIAL

! 100R FUSIBLE METAL FILM RESISTOR 5% 0.25W AXlAL







220R CARBON COMP RESISTOR 10% 0.5W AXIAL

100K CARBON COMP RESISTOR 10% 0.5W AXIAL

COMP REF

C4

C5

C6

C7

C8

C10

C10

C11

C11

C12

C13/14

C15

R824

R835

R836

R933

R934

R934

R935

R936

R937

C1

C2/3

R923

R924-926

R927

R928

R931

VR932

R933

VR837

R838

R840

VR901

R901

R902

VR902

VR903

R904

R905

VR906

R907

R908

VR910

R911

R912

R913

VR914

R915

VR916

R917

R918

R920

VR921

R922

MODEL NO.

PART

NO.

RF273DJO

RF475DJO

RK825GKO

RF472DJO

RK222GKO

RK105GKO

RF475DJO

RK825GKO

RQ226CL2

RF155JJO

RF185JJO

RF185JJO

RF225JJO

RF474JJO

RL102GJO

RF273DJO

CX225NL6

CY103NL6

RQ2260L2

R??????0

???????

RQ103AL1

RF103DJO

RF223DJQO

RF222DJO

RQ102AL2

R0154LJO

RF223DJO

RQ473AL2

RL102GJO

RF223DJO

RQ103AL2

RF474JJO

RG154LJO

RF223DJO

RQ473AL2

RF223DJO

RQ103AL2

RF474JJO

R0154LJO

RF223DJO

RQ473AL2

RL102GJO

(1496/LI2U)

(1486/LI2U)

CD472YL6

CM104TL6

CD472YL6

CM554RK6

CM105NL6

CA108RM7

CA288QM7

CA476HM6

CM105RL6

CD473KK6

COMPONENT

DESCRIPTION


470K CAPBON FILM RESISTOR 5% 0.25W AXIAL


2M2 PRESET POT CARB H MTG 20% 0.15W



1K PRESET POT CARB MIN - MTG 20% 0.1W AXlAL


2K2 PRESET POT CARB MIN H MTG 20% 0.1W AXIAL



1 5K METAL OXIDE RESISTOR 5% 2W AXIAL







1 5K METAL OXIDE RESISTOR 5% 2W AXIAL











220R CARBON COMP RESISTOR 10% 0.5W AXIAL




2M2 PRESET POT CARBON H MTG 20% 0.15W






! 100R FUSIBLE METAL RESISTOR 5% 0.5W AXIAL


! 220nF 250V AC MET POLY CLASS X CAP 20% RADIAL

! 1000pF 250V AC CERAMIC DISC CAPACITOR CLASS Y

20% RADIAL

AS C1

470pF 2KV CERAMIC CAPACITOR 20% RADIAL

10nF 630V MET POLY CAPACITOR 20% RADIAL

470pF 2KV CERAMIC CAPACITOR 20% RADIAL

AS C6

56nF 400V POLY CAPACITOR 20% RADIAL

100nF POLY CAPACITOR 20% RADIAL

100uF 385V ALUM ELECT CAPACITOR - 20+50% RADIAL


4.7uF 35V ALUM ELECT CAPACITOR - 20+50% RADIAL


4700pF 100V CERAMIC CAPACITOR 20% RADIAL

COMP REF

MODEL

NO.

PART NO.

C16 CR104MKO

C17

C13

C20

CL223XJ6

CA106JL0

CY103NL6

C222

C222

C223

C224

C225

C301

C302

C201/202

C203

C204

C205

C206

C207

C208

C210

C211

C212

C213

C214/215

C216/217

C218

C220

C221

C222

C21

C22

C23

C24

C25

C26-28

C30

C31

C32,33

C34

C101, 102

C103. 104

C105

C106

CM1C5RL6

CD223FL6

CA476HM6

CM105NL6

CD472RL6

CA477NM6

CD472RL6

CA478FM6

CM105ML6

CA228FM6

CA107FM6

CM105ML6

CM225KL6

CD102FL6

CM475KL6

CM225KL6

CM105ML6

CA685JLO

CA476HM6

CM104TL6

CP473GGO

CM105ML6

CA228FM6

CM474NK6

CM105NL6

CD104YL6

CL335KN6

CM104TL6

CM475RL6

CL753XJ6

C222 (ALL 1441, 1442 MODELS)

(1446/LF)

(1446/L12)

(1451/MQ3)

(1241/AS)

(1241/AT)

CL563YJ6

CL333XJ6

CL473YJ6

CM684XK6

CA109IN7

CD561RL6

CM225KL6

CM105NK6

C

303

C304

C305/306

C306 (1241/AS)

(1241/AT)

CM155KK6

CA108HM6

C307

C308

C310

C311

C312

CM225KL6

CD122RL6

CA107FM6

CM105NK6

CA478HM6

CA228FM6


10nF 160V POLYSTYRENE CAPACITOR 2.5% AXIAL

! 2200pF 2000V POLYPROPYLENE CAPACITOR 5% RADIAL

1uF 50V ALUM ELECT CAPACITOR 20% AXIAL

! 1000pF 250V AC CERAMIC DISC CAPACITOR CLASS Y

20% RADIAL











10uF ALUM ELECT CAPACITOR - 2+50% RADIAL


AS C101






680nF 50V ALUM ELECT CAPACITOR 20% AXIAL



4700pF 30V POLYSTYRENE CAPACITOR 2.5% AXIAL


220uF 25V ALUM ELECT CAPACITOR - 2O+50% RADIAL



10nF 2KV CERAMIC CAPACITOR 20% RADIAL

! 0.33uF 250V POLYPROPYLENE CAP 10% RADIAL

10uF 630V MET POLY CAPACITOR 20% RADIAL


! 7500pF 1500V POLYPROPYLENE CAP 5% RADIAL

5600pF 2000V POLYPROPYLENE CAP 5% RADIAL

3n3 2000V POLYPROPYLENE CAP 5% RADIAL

4700pF 2000V POLYPROPYLENE CAP 5% RADIAL

68nF 1 500V POLY CAPACITOR 20% RADIAL







AS C302



10uF 25V ALUM ELECT CAP - 20+50% RADIAL




COMP REF

C801

C802/804/806

C803/805/807

C808

C810

C811

C901

C902,904,906

C903,905,907

C910.911

C913

D1-4

D5

D6

D7

D8, 10-14

D11-13

D15,16

D17

D18

D20

D21

D22

D23

D24

D25,116

D101-107

D108,110,111

D108,110,111

D117

D118

D201

D301

D302

D801-803

D804

MODEL

NO.

PART NO.


CM105NL6 100nF 250V METAL POLYESTER CAPACITOR 20% RADIAL

CP271GGO

CP561GG0



10nF 2KV CERAMIC CAPACITOR 20% RADIAL CD104YL6

CM105NL6 100nF 250V METAL POLYESTER CAPACITOR 20% RADIAL

CD104YL6 10nF 1-2KV CERAMIC CAPACITOR 20% RADIAL

CM105NL6

CP271GGO

CP122GG1

CD104YLS

CM105NL6

100nF 250V METAL POLYESTER CAPACITOR 20% RADIAL

27pF POLYSTYRENE CAPACITOR 2.5% AXIAL

120pF POLYSTYRENE CAPACITOR 2.5% AXIAL

10nF 2KV CERAMIC CAPACITOR 20% RADIAL

0.1uF 250V METAL POLYESTER CAPACITOR 20%

DP4007UMO POWER RECTIFIER DIODE IN4007 MOTOROLA AXIAL

OP4005UMO

DF0157UEO

DF0159UEO

DS4148UTO

DS4148UTO

DP4002UMO

DF0159UEO

DZ3875CFCO

D279331FCO

DP4002UMO

DF0159UEO

DF0818UMO

DF0157UEO

DP4002UMO

DS4148UTO

DZ79560FCO

POWER RECTIFIER DIODE IN4005 MOTOROLA AXIAL

FAST RECOVERY DIODE BA157 MOTOROLA AXIAL


SMALL SIGNAL DIODE IN4148 THOMPSON AXIAL


POWER RECTIFIER DIODE 1N4002 MOTOROLA AXIAL


ZENER DIODE BZY88C7V5 400mW 5% AXIAL

ZENER DIODE BZX79C33V 400mW 5% AXIAL



FAST RECOVERY DIODE MR818 MOTOROLA AXIAL




ZENER DIODE BZX79C5V6 400mW 5% AXIAL

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/MS4)

(1431/BS)

(1431/LS1)

(1431/MB4)

(1431/MZ3)

(1431/MZ4)

(1431/MR4)

(1435/MS)

(1436/LS1)

(1436/MS4)

(2030/CS5)

(1439/AS)

(1439/MS4)

(1439/MS)

(1451AP/DS)

(1449/AS) DZ79430FCO

DZ79121FCO

DF0157UEO

DS4148UTO

DP4005UMO

DS4148UTO

DZ79750FC1


ZENER DIODE BZX79C12V 400mW 5% AXIAL

AS D108


SMALL SIGNAL DIODE 1N4148 THOMPSON AXIAL



ZENER DIODE BZX79C75 400mW 5% AXIAL

COMP

REF

D804

D805-808

D901-906

D907

D907

D908 F1/F2

MODEL NO.

PART

NO.

(1441/AL)

(1441/AS)

(1441/MS)

(1442)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT) DZS8750FCO

DS4148UTO

DS4148UTO

DZ79750FC1

(1496/LI2U)

(1439/AS)

(1439/MS)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1436/LS1)

(1436/MS4)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

(1456/LI2)

(1451AP/MS4)

(1451AP/DS)

(1451/DS)

(1451/MS4)

(1451/MQ3)

(1451/AS) DZ88750FCO

KA2001BAO


DIODE BZY88C7V5

SMALL SIGNAL DIODE 1N4148 THOMPSON AXIAL



ZENER DIODE BZY88C7V5 400mW 5% AXIAL

AS D805 ! FUSE 2AMP (20mm) TIME DELAY

_____________TRIPLE STANDARD - PAL INTERFACE _________

GENERAL

The 'Triple Standard - PAL Interface Assembly' is designed to interface between the Series 3 main chassis PCB assembly and the host system. It is designed to accept RS170 video signals (0.7v p-p video + 0.3v p-p mixed - Ve

Sync into 75R). In wire-frame chassis format, output connections from interface to main chassis PCB are made via hard-wired flexible leads and rnultiway plug-in connectors PL102 and PL103, located on the mam chassis.

On some models, an interface input wiring harness lead assembly is provided. This is supplied with one end only of the harness terminated in a 17-way connector, the opposite wire ends being unterminated. Circuit details and connections for this harness lead assembly are given in the accompanying diagram - ' 1 7-Wav Harness Connections' and Table of Options'.

DOUBLE STANDARD/TRIPLE STANDARD INPUTS

Depending on how the interface assembly is installed, input modes for either double or triple standards may be accommodated as follows:

1. TTL and PAL Video Mode - Double Standard

2. TTL, 1 volt 75 ohm and PAL Video Mode - Triple Standard

1. Double Standard Input

When wired as indicated in the diagram - TTL' and 'PAL Video' Modes are accommodated. Either one of these two modes may be selected by a 'single pole change-over' switch as shown in the diagram.

2. Triple Standard Input

Wiring details to accommodate Triple-Standard inputs and the various input options are given in the' 17-Way Harness Connections' Diagram and the accompanying Table of Options'.

Suitable additional switching may be incorporated to accommodate the various options, depending on user require-ments.

OPERATIONAL NOTES

1. PAL/Sync Input

When this input (PL1-pin 16) is used as the separate sync input of a 1v/75R R.G.B. + sync video source, the amplitude of the sync MUST BE between 0.2v p-p and 0.7v p-p, nominally 0.3v peak to peak. If the amplitude exceeds these values, an 'In-Line' B.N.C. attenuator must be used.

2. Sync-On Green Option

Setting Plug Link TL1' on the PAL Interface PCB to 'Position 2', allows a 'sync-on-green' 1V/75R

RGB Video Source to be used.

NB: Note that the 'Green' 1V/75R video input (PL1-pin 12) now also becomes the PAL input.

See wiring diagram and Table of Options'.

BRIGHTNESS CONTROL LIMIT

If required - a resistor of 5K6 ohms 0.25W - may be incorporated in series with the 'brightness' control to limit the control's range of 'brightness' variation - as shown in the diagram.

AUDIO STAGE

On some versions of the interface, either single channel or twin channel audio amplifier stages may be incorporated, depending on model and specification.

Inputs and outputs for the audio stage(s) are marked as left-hand channel (L) and right-hand channel (R) and are terminated in 2-pin connectors. Normally, only a single channel audio stage is provided in most applications.

Audio input to the stage may be fed across a 47k 'gain control' pot, with the slider taken to the audio stages input.

1

2

3

4

T SERIES CABINET - 14 INCH MODEL

A foam polyurethane moulded cabinet incorporating a swivel base assembly T SERIES

IDENT NO.

CABINET COMPONENT PARTS

PART NO.

DESCRIPTION

PC5047I02

PC5046I01

PC5045IO1

PC5044I01

FACIA. CABINET BEZEL MOULDING

CABINET COVER MOULDING

CABINET BASE MOULDING

CABINET PLINTH MOULDING

1

2

3

4

M SERIES CABINET - 14 AND 20 INCH MODELS

This cabinet is an all metal, rugged construction. The 20 inch model was deleted from production in December

1983.

IDENT NO.

PART NO.

M SERIES CABINET COMPONENT PARTS

DESCRIPTION

MC0066I04

MC0021I05

MC0019I03

MC0094I03

FACIA. CABINET BEZEL

CABINET TOP/SIDE ASSEMBLY

CABINET BASE ASSEMBLY

CABINET BACK ASSEMBLY

1

2

3

4

5

6

L SERIES CABINET - 14 INCH MODEL

This cabinet is constructed of high density structural foam. A modern compact design, available in different colours.

IDENT NO.

PART NO.

L SERIES CABINET COMPONENT PARTS

DESCRIPTION

PC0103I05

PC0104I02

PC0107I02

P00308I01

PC0105I01

M00141I03

FACIA. CABINET BEZEL


CABINET BASE ASSEMBLY (MOULDED)

CABINET BASE PANEL (MOULDED)


INPUT AND CONTROLS BRACKET ASSEMBLY (METAL)

1

2

3

4

D SERIES CABINET - 14 INCH MODEL

This cabin is injection moulded, and is one of the latest designs offered in the MICROVITEC CUB monitor range and is available in different colours.

IDENT NO.

PART NO.

D SERIES CABINET COMPONENT PARTS

DESCRIPTION

PC0124I01

PC0125I01

PC0126I01

M00221I04

FACIA, CABINET BEZEL

CABINET

HINGED DOOR

INPUT BRACKET ASSEMBLY (METAL)

1

2

2

3

4

5

C SERIES CABINET - 20 INCH MODEL

This cabinet is an all metal, rugged construction, incorporating carrying handles fitted on each side.

IDENT NO.

PART NO.

C SERIES CABINET COMPONENT PARTS

DESCRIPTION

PC0136I03

MC0137I04

MC0150I03

M00235I02

MC0139I01

PC0140I01

FACIA, CABINET BEZEL


CABINET TOP/SIDE ASSEMBLY (INCL. SPEAKER)

CABINET BASE ASSEMBLY


BLISTER. FITTED TO CABINET BACK

COMP REF

MODEL NO.

PART

NO.


TR802,805,807

902,904,906

TR802,805,807

902,904,906

TR802,805

TR803,907

TR806

TR807

TR902,904,906

TRIPLER

TY1,2

PCB

QS0787UM1

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1436/LS1)

(1436/MS4)

(1486/LI2U)

(1435/MS)

(1439/AS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1449/AS)

(1241/AS})

(1446/LF)

(1446/LI2)

(1241/AT) QS0869UAO

QS0869UAO

QS4123UMO

QS0393WT1

(1441)

(1442)

(1241/AS)

(1431AP/MS4)

(1431AP/DS)

(1496/LI2U)

(1451/AS)

(1451/DS)

(1451/MS4)

(1451AP/MS4)

(1451/MQ3)

(1451AP/DS)

(1456/LI2)

(2031/CS5)

(2031/AX)

(2032/AM)

QS0869UAO

QS0869UAO

ET001QA1

QY0103UMO

BC0029106

NPN SILICON TRANSISTOR BF787-5 MOTOROLA


TRANSISTOR BF869

NPN SILICON TRANSISTOR 2N4123 MOTOROLA

TRANSISTOR BF393 W1

TRANSISTOR BF869


TRIPLER BG1897

THYRISTOR BR 103 MOTOROLA AXIAL

MAIN PCB ASSEMBLY SERIES 3 (6)

COMP REF MODEL NO.

PART NO.

TR2

HEATSINK

TR2

TR16

TR16

HEAT SINK

TR101

TR102

TR103-105

TR106

TR201

TR201

HEATSINK

TR202

TR202

HEATSINK

TR301

TR801,804,806

901,903,905

TR801-804

QT002AXO

(1496/LI2U)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431 /LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1451/AS)

(1451/DS)

(1451/MS4)

(1451AP/MS4)

(1451/MQ3)

(1451AP/DS)

(1456/LI2)

(2032/AM)

(1486/LI2U)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT)

HEATSINK

QP0753UXO

A00007102

M00205I01

QS0500UMO

OR

QS0500VXO

A00008102

QS0337UTO

QS4123UMO

QS4125UM5

QS0337UTO

QS0460UMO

M00305I01

QS0500UMO

M00205I01

QS0392UMO

(1441,1442)

(1449/AS) QS0393WT1

COMPONENT

DESCRIPTION

NPN DARLINGTON TRANSISTOR TIPL 753A (R3213)

NPN TRANSISTOR TIPL753A (R321 3)

LCCD HEAT SINK (SMPSU) ASSEMBLY

HEATSINK REDPOINT TV3 SPECIAL

NPN SILICON POWER TRANSISTOR MOTOROLA BU500

NPN SILICON POWER TRANSISTOR TEXAS BU500

LCCD HEAT SINK (LOPT) ASSEMBLY

NPN SILICON TRANSISTOR BC337-5 MOTOROLA

NPN SILICON TRANSISTOR 2N4123 MOTOROLA

PNP SILICON TRANSISTOR 2N4125 MOTOROLA

NPN SILICON TRANSISTOR BC337-5 MOTOROLA



NPN TRANSISTOR SIL BU500


AS TR106

NPN SILICON TRANSISTOR BF392 MOTOROLA

TRANSISTOR BF393.W1

COMP REF

TL201

TL201A/B

TL202-2

TL901

TL901

TL901

TL901A/B

TL901A/B

TR1

MODEL

NO.

PART NO.


(2031/CS5)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1436/LS1)

(1436/MS4)

(1441/MS4)

(1449/AS)

(2031/CS5)

(2032/AM)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1486/LI2U)

(1451/AS)

(1451/DS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1456/LI2)

(1241/AT) KL4838Z02

(1435/MS)

(1435/MS)

KM3070Y01

WL2210TU1

KM3070Y01

KL4838Z02

KM0006Y01

KM3070Y01

KL4338Z02

QS0307UM5

LINK TEST 10/4838 PRESSAC

PIN TEST 10/3070 PRESSAC

WIRE LINK 5mm + 10mm + 5mm



PIN TURRET 10/006 PRESSAC



PNP SILICON TRANSISTOR BC307-5 MOTOROLA

COMP REF

MODEL

NO.

TL102A/B,

201A/B

PART NO.


(2030/CS5)

(2031/AX)

(2032/AM)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1451/AS)

(1451/DS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1456/LI2)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT) KM3070Y01 PIN TEST 10/3070 PRESSAC

COMP REF MODEL NO.

PART NO.


TL101.103-1C6

TL102

(2031/AX)

(2032/AM)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1486/LI2U)

(1451/AS)

(1451/DS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1456/LI2)

(1241/AT) KS7859I02

(1486/LI2U)

(1435/MS)

(1446/LI2) KL4838Z02

SOCKET-SHORTING 7859-02

TEST LINK 10/4838 PRESSAC

COMP REF

TL101-106

(1431,AS)

MODEL NO.

PART COMPONENT NO.

DESCRIPTION

(2030/CS5)

(2031/AX)

(2032/AM)

(1431AP/MS4)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1486/LI2U)

(1451/AS)

(1451/DS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1456/LI2)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT) KP0024A03 3-WAY PLUG 20/3423

COMP REF MODEL NO.

PART NO.


TH2 (1496/LI2U)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

(1439/AS)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1486/LI2U)

(1451/AS)

(1451/DS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1456/LI2)

(1241/AT) RT003NNO THERMISTOR 15 OHMS 30% K231

COMP

REF

T1

T1A/1B

T2

T2

T201

T202

T203

T203

TH1

TH1

MODEL

MO.

PART NO.

LM0001UA1

C

OMPONENT DESCRIPTION

LINKS 2 x 14mm

CHOKE (OREGA) 88545-00

TI0004I06

(1496/LI2U)

(1486/LI2U) TL002SU0

TI0009I01

TI0003I01

TI0007I01

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

(1496/LI2U)

(1486/LI2U)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1441/AL)

(1441/AS)

(1441/MS)

(1451/AS)

(1451/DS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1456/LI2)

(1241/AT)

TI0016I01

RT002QL0

RT005QN0

TRANSFORMER SWITCH MODE ISOLATING PC5287 OR

PC5307

TRANSFORMER SWITCH MODE ISOLATING PC3960

TRANSFORMER LINE DRIVER PC4163

! TRANSDUCTOR EAST-WEST PC3396

TRANSFORMER LINE OUTPUT 14" PC3755

TRANSFORMER LINE OUTPUT 20"

THERMISTOR PTH45LC09-BG8ROH140

THERMISTOR 263100P2332T333

I

COMP

REF

PL3

PL101

PL102

PL103

PL103

PL201

MODEL NO.

PART NO.


(1496/LI2U)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1439/MS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS 4)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

(1486/LI2U)

(1451/AS)

(1451/DS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1456/LI2)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT) KP0300D05

KP0026A10

KP0025A05

KP0025A10

5-2 PIN INLINE PLUG MTG SHROUDED LOCKABLE,

PRESSAC 320/3765

10 PIN INLINE PLUG PCB MTG SHROUDED PRESSAC

20/3450

5-2 WAY INLINE PLUG PCB MTG 20/3345

10 PIN INLINE PLUG PCB MTG UNSHROUDED PRESSAC

20/3430

(2030/CS5)

(1431AP/MS4)

(1431AP/DS)

(1435/MS)

(1439/AS)

(1451AP/MS4)

(1449/AS) KP0026A10

KP0222D08

OR

KP0300D08

10 PIN INLINE PLUG PCB MTG SHROUDED PRESSAC

20/3450

8 PIN INLINE PLUG PCB MTG UNSHROUDED PRESSAC

220/1138

8 PIN INLINE PLUG PCB MTG UNSHROUDED LOCKABLE,

PRESSAC 320/3768

COMP REF MODEL NO.

PART NO.


LK 1-5,7,8

10-18,20-22

LK23

PL1

PL1

PL2

PL3

WL2214TU1

(2031/AX)

(2032/AM)

(1451/AS)

(1451/DS) WL2214TU1

KP0220D06

(1496/L12U)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

(1439/AS)

(1439/MS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1486/LI2U)

(1451/AS)

(1451/MS)

(1451/DS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1456/LI2)

(1241/AS)

(1446/LF)

(1446/L12)

(1241/AT) KP0300D06

KP0025A03

KP0220D05

WIRE LINK 5mm x 14mm x 5mm


PIN INLINE PLUG PCB MTG SHROUDED PRESSAC

20/1546

6 PIN INLINE PLUG PCB MTG SHROUDED LOCKABLE,

PRESSAC 320/3766

PLUG 3 WAY 20/3443

5-2 PIN INLINE PLUG MTG SHROUDED PRESSAC 220/2145-

2,4

COMP REF

L925

L926

L926

MODEL NO.

PART NO.


LW154UA5 5uH (IN SERIES WITH R925)

(1496/LI2U)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431 /LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1439/MS)

(1441/MS4)

(1451AP/MS4)

(1451/MS4)

(1451/MQ3)

(1451AP/DS)

(1451/DS)

(1456/LI2)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM) LW154SK2

LW154UA5

CHOKE 15uH B78108-T1153-K

15uH (IN SERIES WITH R926)

(1496/LI2U)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1439/MS)

(1441/MS4)

(1451AP/MS4)

(1451/MS4)

(1451/MQ3)

(1451AP/DS)

(1451/DS)

(1456/LI2}

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM) LW154SK2 CHOKE 15uH B78108-T1153-K

C

OMP REF

L901

L924

MODEL

NO.

PART NO.

(1496/LI2U)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1439/MS)

(1451/AS)

(1451/MS4)

(1451/MQ3)

(1451AP/MS4)

(1451AP/DS)

(1451/DS)

(1456/LI2)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM) LW154SK2

LW154UA5

(1496/LI2U)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/M23)

(1431/M24)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1439/MS)

(1451/AS)

(1451/MS4)

(1451AP/MS4

(1451AP/DS)

(1451/DS)

(1451/MQ3)

(1456/LI2)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM) LW154SK2


CHOCK WIRE ENDED 15uH B78108-T1153-K

15uH (IN SERIES WITH R924)


COMP

REF

L2

L201

L202

L203

L204

L801-804

L801

L802

L803/804

L901

MODEL NO.

PART NO.


(1496/LI2U)

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1439/MS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1486/LI2U)

(1451/AS)

(1451/DS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1449/AS)

(1456/LI2)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT) LW104UA7

LW154SK2

LV001UA5

LN002UA5

LW104UA7

(1441/AL)

(1441/AS)

(1441/MS)

(1442)

(1446/LF)

(1446/LI2)

(1241/AT) LW154SK2

LW154VA5

LW104VA4

LW104VA4

LW154UA5

CHOKE WIRE ENDED 10uH PC5640

CHOKE WIRE ENDED 15uH B78108-T1153-K

COIL WIDTH PC3398

COIL LINE LINEARITY PC5580







COMP REF

FH3A/B

HARNESS

HARNESS

HARNESS

HARNESS

HARNESS

HARNESS

IC1

IC1

(HEATSINK)

IC101

IC102

IC201

IC301

IC301

(HEATSINK)

L2

MODEL

NO.

PART NO.


(2031/CS5)

(2031/AX)

(2032/AM)

(1431AP/MS4)

(1431AP/DS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1451/AS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1451/DS)

(1449/AS)

(1456/LI2)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT)

(2031/CS5)

(1449/AS)

2031/CS5)

(1441/AL)

(1441/AL)

KS0001Y01

A00584I01

A00585I01

A00815I01

A00816I01

A00104I01

A00179I01

IV7812MX3

HH0003HAO

IT74136MM2

IV7805LXO

IL1180PS2

IL1170SS2

HHC001HCO

LW473UA6

FUSE CLIP-PCB MTG (5mm)

TB -NO. 1 (4 LEADS) BR, OR, W, Y.

TB - NO. 2 (8 LEADS)

TB - NO. 1 (4 LEADS) BR, OR, W, Y.




VOLTAGE REGULATOR 1C 78M12

HEATSINK 1 STAVER TYPE V6-2L

OR/TTL LOGIC SN74LS136N

VOLTAGE REGULATOR IC "1" 78L05

LINEAR Bl-POLAR IC TDA 1180P PLASTIC DIL S.G.S.

LINEAR Bl-POLAR IC TDA 1170S PLASTIC DIL S.G.S.

HEATSINK STAVER V8-800


COMP REF

MODEL NO.

PART NO.


FH1A/B,FH2A/B

FH3A/B

(2030/CS5)

(2031/CS5)

(2031/AX)

(2032/AM)

(1431AP/MS4)

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1439/MS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1451/AS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1451/DS)

(1449/AS)

(1456/LI2)

(1241/AS)

(1446/LF)

(1446/LI2)

(1241/AT)

(1496/LI2U)

(1486/LI2U)

KS0003Y01

KS0006Y01

FUSEHOLDER L222/K

FUSE CLIP-PCB MTG (6.3mm)

COMP REF

F2

F3

FH1 A/B

MODEL

NO.

PART NO.

COMPONENT

DESCRIPTION

(1431AP/DS)

(1431/AS)

(1432/AS)

(1431/BS)

(1431/LS1)

(1431/MZ3)

(1431/MZ4)

(1431/MB4)

(1431/MR4)

(1431/MS4)

(1431/DS)

(1435/MS)

(1436/LS1)

(1436/MS4)

(1439/AS)

(1439/MS)

(1441/AL)

(1441/AS)

(1441/MS)

(1441/MS4)

(1451/AS)

(1451/MS)

(1451AP/MS4)

(1451/DS)

(1446/LF)

(1449/AS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1456/LI2)

(1241/AS)

A/B

(2031/AX)

(2032/AM)

(1431/AS)

(1432/AS)

(1431

AP

/MS4)

(1431AP/DS)

(1439/AS)

(1439/MS)

(1451/AS)

(1451/MS)

(1451AP/MS4)

(1451AP/DS)

(1451/DS)

(1241/AS)

(1446/LF)

(1446/LI2)

(1456/LI2)

(1241/AT)

(2031/AX)

(1431/AS)

(1432/AS)

(1431AP/MS4)

KA2001BAO

KA1001BQO

KS0001Y01

! FUSE 2AMP (20mm) TIME DELAY

TYPICAL AUDIO SPECIFICATIONS

Typical specifications for the audio amplifier stage are as follows:

Input impedance: 47 k nominal

Input sensitivity: 100 mV typical

Output: 2 watts max @ 1kHz into 16 ohms

TABLE OF OPTIONS

Connector Available Standards

Pin No.

Wire Colour Coding TTL 1V/75R PAL

10 Brown O/C 0V (S/C) 0V (S/C)

15 Mauve • > 0.7V < 12V (O/C) 0V (S/C)

17 Pink 0V (S/C)

> 10.5V < 12V (O/C) > 10.5V < 12V

(O/C)

NOTES:

- Not Critical (May be 0V to 12V or O/C)

0/C = Open Circuit (No connection)

S/C = Short Circuit (< 10 R) to 0V (Ground)

Circuit Reference

PARTS LIST

Component Reference

Component Description

RESISTORS

R5, 20, 21, 23, 25, 27, 28 RF104DJO

R6, 8 RF562DJO

R7, 30

R9

R10

R11, 12

R13, 18

RF473DJO

RF156DJO

RF183DJO

RF392DJO

RF225DJO

R14, 15

R16

R17

R19

R22, 24, 26

R31

R32

R33

R40

R101, 201

R102, 202

R103, 203

VR1

CAPACITORS

RF123DJO

RF272DJO

RF273DJO

RF184DJO

RF103DJO

RL101DJO

RF392DJO

RF152DJO

RF103DJO

RF104DJO

RF222DJO

RF100DJO

RQ102AL2

C1,2

C3

C4

C5

C6, 8-15

C7

C16, 17, 18, 19, 20, 27

C21

C22

C23

C24

C25, 26

C30

C31

C101, 102, 201, 202

C103, 203

C104, 204

C105, 205

C106, 206

C107, 207

CA337EN6

CK331JJO

CK121JKO

CK681JJO

CK104FLO

CM225KK6

CM105NL6

CK222JKO

CM105NL6

CK103JKO

CK151JKO

CM4758K6

CA107JL7

CA105NL6

CA2268M7

CA107JL7

CM225KL6

CA109HM6

CM105NL6

CA478FM7

RESISTOR C/F 10K 1/4W 5%

RESISTOR C/F 560R 1/4W 5%

RESISTOR C/F 4K7 1/4W 5%

RESISTOR C/F 1M5 1/4W 5%









RESISTOR M/FUS, 10R 1/4W 5%



RESISTOR C/F 1KO 1/4W 5%



RESISTOR C/F 1R0 1/4W 5%

POT PRESET 100R 0.1W H7

CAPACITOR ALUM/ELEC 33uF 16V

CAPACITOR CERAMIC/T 33pF 50V



CAPACITOR CERAMIC/T 10nF 25V 20%

CAPACITOR MET/T 0.22uF 100V

CAPACITOR MET/T 0.1uF 250V


CAPACITOR MET/P 0.1uF 250V

CAPACITOR CERAMIC/T 1nF 50V

CAPACITOR CER/T 15pF 50V AXIAL

CAPACITOR MET/P 470nF 63V

CAPACITOR A/ELEC 10uF 50V 20% RAD PR

CAPACITOR CERAMIC/T 100nF

CAPACITOR A/ELEC 2.2uF 63V PREF

CAPACITOR A/ELEC 10uF 50V 20% RAD PR





Circuit Reference

PL1

PL2

PL102

PL103

PL104

TL1

MISCELLANEOUS

FIT TL1

X1

2 TRACK CUTS

LK1, 2, 3

LK6 7, 8

LK9, 10

LK12, 13

Component Reference Component Description

DIODES

D1, 2, 3

D4, 5

INTEGRATED CIRCUITS

DZ73560FRO

DS4143UTO

IC1

IC2

IC101, IC201

CHOKES & DELAY LINES

IL3301UM3

IG4551UM2

IL19080S2

L1

L2

L3

L4, 5

L11

DL1

DL2

CONNECTORS

LW474SK2

LW105SK2

LW104SK2

LV001TA3

LW154SK2

ED0001P01

ED0002P01

KP0026A17

KP0026A16

KP0025A05

KP0025A03

KP0025A04

KP0024A03

KL9005Z02

XC0014UU6

BC0111I02

WL2214TU1

WL2212TU1

WL2214TU1

WL2212TU1

A01647101

DIODE ZENER BZX79B5V6 2%

DIODE 1N 4148 THOMSON

CIRCUIT INT. TDA3301 SELECTED

CIRCUIT INT. 4551

CIRCUIT INT. TDA 1908

CHOKE 47uH

CHOKE 100uH

CHOKE 10uH

CHOKE KAN K2819XM


DELAY LINE DL470

DELAY LINE DL711

PLUG 17-WAY 20/3457

PLUG 16-WAY 20/3456

PLUG 5-WAY 20/3445

PLUG 3-WAY 20/3443

PLUG 4-WAY 20/3444

PLUG 3-WAY 20/3423

LINK TEST MOLEX 90059-0009 P/0

CRYSTAL IQD TYPE 'P' A124D

PCB PAL INTERFACE





I/FACE ASSEMBLY TPL/STD - MC REV 3

SPECTRUM INTERFACE CARD - DESCRIPTION/OPERATION

1. LUMINANCE CHANNEL (Y)

A. The (-Y) signal contains:

(1) Video information

(2) line sync pulses

(3) frame sync pulse

3. The incoming Y signal is attenuated by the potential divider, R16, R17 the resultant signal is then amplified by TR6.

C. Transistors TR7, TR8 and TR9 have the following functions:-

(1) TR7 - Separates the sync pulses

(2) TR8 - Inverts the sync pulses

(3) TR9 - Buffers the sync pulses

R28 and R29 in the emitter of TR9, splits the voltage swing to produce a 'SYNC TTL' output.

D. The rising edge of the sync output signal is used by C6, R3Q and TR24 to produce a pulse which has the same duration and timing as the colour burst gating pulse on the +/- (R-Y) signal.

E. The luminance signal on the collector of TR6, is clamped to the black level by C10 and TR25.

F. The black level is set by resistor/diode potential divider formed by VR1, (R36. R37, R65 and 2

IN4148 diodes).

2. COLOUR DIFFERENCE CHANNELS

A. The -(B-Y) Channel

(1) The -(B-Y) signal is attenuated by a potential divider network R32 and R34. TR10 inverts and amplifies to produce + (B-Y). TR11 and C9 use the sync pulses to clamp the + (B-Y) signal to the black level.

(2) TR21 merges + (B-Y) clamped signal to +Y clamped signal to produce the BLUE output.

(3) TR22, is an electronic switch that has its threshold set by R56 and R57.

(4) The gain of TR22 is set by R58 and R59 to produce TTL levels. TR23 emitter follows the TTL signal which produces a buffered output.

B. The +/- (R-Y) Channel

This channel is a phase alternating line (PAL) signal, which requires alternate lines, inverted to produce + (R-Y).

(1) The incoming +/- (R-Y) signal is A.C. coupled by C17, C1 and TR1 thus forming a unity gain, phase splitter.

(2) The non inverted output of TR1 drives an electronic switch (TR3). The inverted output of TR1 is buffered by TR2.

(3) The (R-Y) switch is enabled during the colour burst, gating pulse.

(4) A set/re-set flip-flop switch formed by IC 1C and IC 1D works in the following :-

(a) SET - If next line of video is POSITIVE

(b) RESET - If next line of video is NEGATIVE

(5) The outputs of 1C1D enable bi-directional switches which will either:

(a) Connect +(R-Y) through C1

(b) Connect inverted -(R-Y) through C2.

Thus producing +(R-Y). TR4 and TR5 clamp the +(R-Y) to the black level.

(6) The + (R-Y) clamped signal is added to the +Y clamped signal by TR13 to produce +R signal.

(7) TR14 has its threshold set by R43 and R42. the gain is set by R44 and R45, in order to produce TTL levels.

(8) TR15 emitter follows the TTL signal thus producing a buffered signal output.

C. THE (G-Y) OUTPUT

(1) This signal is generated by mixing the following:-

(a) The (B-Y) clamped signal. TR16 performs this mixing function

(b) The (R-Y) clamped signal, TR16 performs this mixing function

(2) The proportions of (B-Y) and (R-Y) clamped signals which are added together are set by R54 and

R40.

(3) G OUTPUTS

(a) This signal is produced by the addition of the following signals:-(i) (G-

Y) clamped signal. TR17 performs this function. (ii) +Y clamped signal, TR17 performs this signal function.

(4) TR18 has its threshold set by R48 and R49. the gam is thus set by, R50 and R51 in order to produce suitable TTL levels. (5) TR19 emitter follows the TTL signal and produces a buffered output.

__________________'PROM' INTERFACE PANEL_________________

GENERAL

1. The 'Programmable-read-only-memory' (PROM) interface panel is used with certain models in the

'SERIES-3' range of colour monitors. Two different versions of the panel assembly may be used depending on model and intended country of operation.

2. Basically, the two versions are very similar.

(1) Versions incorporating R.F.I. filtering networks (L/C components L1 to L3 & C4 to C6), are employed with certain models intended for use in countries other than the UK.

(2) Versions without R.F.I. filtering are currently used for models operating in the U.K.

3. Interface connections:

(1) When installed, this panel assembly interfaces between input connector PL101, located on

'SERIES-3' main chassis PCB and the monitor's 'user' 7-pin Din input socket.

NOTE: The 'customer' contrast control VR111, shown on the 'SERIES-3' main chassis circuit diagram, is not fitted as shown when the PROM interface is used. In this case, the

'customer' contrast control pot is connected to 'PL2', located on the PROM interface panel.

(2) The 'PROM-INTERFACE CONNECTION DIAGRAM' provides wiring interconnection details.

CIRCUIT DIAGRAM

1. The circuit diagram for the 'PROM INTERFACE PANEL' provides circuit details of the panel assembly.

Component values are given in the accompanying LIST of COMPONENTS.

CIRCUIT DESCRIPTION

1. The purpose of the 'PROM' interface panel is to convert 4-Bit digital video signals, normally referred to as

'R.G.B. & Intensity', into Linear R.G.B. signals.

2. Colour Combinations

4

(1) There are 16 possible colours which can be displayed (2 combinations).

(2) IC2, a fusible link PROM, provides sixteen 8-bit outputs corresponding to one of the 16 addresses selected by the R.G.B. and intensity signals.

These outputs use 3-bits for RED and GREEN, and 2-bits for BLUE video, hence; there are 8 levels of Red and Green and 4 levels of Blue available.

(3) Resistors R3 to R10 and resistors R11 to R18 form potential dividers respectively between base and collector resistors of TR101, TR102, TR103, located on the 'SERIES-3' main PCB. Resistors values are selected to 'weight' respective PROM outputs, to 'least significant' and 'most significant' bits.

NOTE: When the 'PROM interface Panel' is installed, the moveable links PL103, shown in the

'SERIES-3' main circuit diagram, should be fitted into linked POSITION (1).

3. +5 Volt Supply

(1) IC1, C2 and C3 provides a regulated + 5V supply for IC2.

4. Protection & Termination

(1) Diodes D1 to D5 provide flash-over protection for IC2 and for computer signal 'in' sources.

(2) Reistors R21 to R26 may be fitted on some models to terminate incoming digital signals.

5. Contrast Control

(1) Transfer TR1, R1 and an external pot connected to PL2 provide for 'customer' control of contrast on some models.

(2) TR1 forms an emitter follower, the voltage at the emitter determining the video output amplitude on

'contrast'.

_________LIST OF COMPONENTS - PROM INTERFACE PANEL____________

GENERAL

1. Components used in the Prom Interface Panel Assemblies, together with possible component variations are listed following;

2. Details of possible circuit variations, used with different versions of the panel, are shown in the accompanying Prom Interface Circuit Diagram.

RESISTORS

1. Most of the resistors employed in the construction are standard carbon film types of 0.25 watt rating.

±5% tolerance.

Component Reference

LIST OF COMPONENTS - PROM INTERFACE

Part No.

Component Description

RESISTORS

R1

R2

R3,6,11,14,20,21,22,23,24,25,26

R4,7,10,12

RF683DJO

RF391GJO

RESISTOR C/F 6K8 0.25W 5%

RESISTOR C/F 39R 0.5W

RF222DJO RF472DJO RESISTOR C/F 220R 0.25W 5% RESISTOR C/F 470R

R15,18

R5,8,13

R16

RF103DJO

RF103DJO

RF683DJO

RF102DJO

0.25W 5%

RESISTOR C/F 470R 0.25W 5%



R9,17

R19

RESISTOR C/F 100R 0.25W 5%


NOTE FOR APPLE MONITORS ONLY; - RESISTOR C/F R9,R17 BECOMES 220R 0.25W 5%

CAPACITORS

C1

C2,3

C4,5,6

CA2268M6

CM105ML6

CK151JKO

DIODES, TRANSISTORS, INTEGRATED CIRCUITS

TR1

IC1

IC2

D1,2-5

CONNECTORS

QS0337UTO

IV7805LXO

IR18030AX2

DS4148UTO

PL1,3

PL2

INDUCTORS

L1,2,3

KP0026A10

KP0025A05

LW104SK2

CAPACITOR ALUM/ELEC 2.2UF 63V

CAPACITOR MET/P 0.1 UF 160V

CAPACITOR CER/T 15PF 50V

TRANSISTOR BC337-5

CIRCUIT INT. 78L05

PROM TBP 18SA030N (PROGRAMMED INDIVIDUALLY

FOR SPECIFIC MODEL)

DIODE IN4148 THOMPSON

PLUG 10 PIN 20/3450 PRES

PLUG 5 WAY 20/3445

CHOKE 10 UH

6. Sync Signals

(1) Sync signals are not required by the PROM circuitry and are passed directly through the interface panel.

7. R.F.I. Filtering

(1) On models requiring R.F.I. filtering, L/C networks formed by L1/C4, L2/C5 and L3/C6 are fitted on

R. G & B outputs.

AMENDMENTS

AFFECTS

All metal cabinet monitors.

DESCRIPTION

Modifications to bring cabinet back vvire routing, dressing and securing in line with current production practice.

IMPLEMENTATION

These modifications only apply whenever a monitor is returned for service.

MODIFICATIONS

With the cabinet top removed check the following:

Signal Wires On Cabinet Back Components

(DIN sockets. BNC sockets, mode switches, brightness/contrast controls etc).

a) It is now the practice to fit a 'tyrap' fastener onto the signal wires on each component. (See diagrams).

A 'tyrap' should be fitted to any component which is found not to have one.

Note: The signal wires are already mechanically twisted onto each pin and then soldered : this modification provides additional wire attachment.

b) If it is possible to move any of these signal wires away from its normal position to touch the small exposed section of the terminals on the main switch then sufficient 'tyraps' should be fitted to these wires to hold them in position.

Note: This does not apply to wires which are already contained within a secondary sleeve. Single

Insulated Mains Wires On Mains Switch

This only applies to the short sections of mains cable from which the outer sheath has been removed to allow the individual wires to be attached and soldered to the mains switch.

If it is possible to move any of these short sections of wire away from its normal position to touch a pin on one of the cabinet back components then sufficient 'tyraps' should be fitted to the mains wires to hold them in position. (See diagram).

Microvitec Series 3 1431/1432, 1451, 2030, 2040 Colour Display Monitor, Series 3 1441/1442 High Resolution Monitor Service Manual

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