Shure SLX 2 Wireless Transmitter Service Manual

SLX2 Wireless Transmitter Service Manual

25A1090

SLX2 WIRELESS HANDHELD TRANSMITTER

PRODUCT DESCRIPTION

The Shure Model SLX2 is a µP (microprocessor) controlled frequency agile UHF handheld transmitter operating over the frequency range of 518 to 865 MHz (in eight different 24 MHz-wide frequency bands). The transmitter will operate for a minimum of 8 hours using two "AA" alkaline batteries. The User Interface includes "mode" and "set" buttons, and an LCD that displays battery status, group/channel, and transmitter/ receiver frequency synchronization. The SLX2 has a plastic enclosure, and utilizes an internal antenna for optimum range and reliability. This product is intended for use in entry-level presentation, installed, and performance markets.

SLX mute select

FEATURES

©

2006, Shure Incorporated

25A1090 (Rev.3)

1.

Frequency agile; microprocessor controlled. Model number extension determines frequency band of operation.

2.

Minimum of 12 compatible systems per SKU in the U.S. Additionally, a minimum of 12 compatible systems in the top 50 U.S. markets across all three domestic SKU's (H5, J3, and L4).

3.

Operating frequency programmable locally or from the receiver using a built-in IR link.

4.

Designed for use with "AA" alkaline batteries (2 required). May also be used with rechargeable "AA" batteries. Note: battery condition indicator is calibrated for alkaline batteries and may not be accurate with rechargeable types. Electrical reverse battery protection is included.

5.

Minimum battery life of 8 hours with new "AA" alkaline batteries.

6.

Designed for use with SM58, BETA 58, SM86, and BETA 87A&C microphone heads. Compatible with "active load" or standard heads (active load circuitry to be incorporated in heads).

7.

Tone key squelch.

8.

Power/Mute and Select buttons with LCD display for frequency group/channel selection and control. LED backlight for easy reading of LCD display.

9.

Bicolor, green/red LED for power "on" and low battery, mute and infrared link indications.

10.

Rugged plastic construction.

11.

Utilizes Shure Patented ARC (Audio Reference Companding) audio processing.

DETAILED DESCRIPTION

Features

1

2

3

SLX

1 Interchangeable microphone head (SM58 pictured)

2 Power / Infrared (IR) / Mute indicator

Green: ready

Amber: mute on

Flashing red: IR transmission in process

Glowing red: battery power low

Pulsing red: battery dead (transmitter cannot be turned off until batteries are changed)

3 LCD screen

4 On-off / mute switch

Press and hold to turn on or off. Press and release to mute or unmute.

5 Select switch

6 IR port

Receives infrared beam to synchronize frequencies. When using multiple systems, only one

transmitter IR port should be exposed at a time.

4 mute select 5

6

SLX mute select

Adjusting Gain

Access the gain adjustment switch a

by unscrewing the head of the microphone.

Two gain settings are available on the SLX2. Choose a setting appropriate for vocal volume and for the performing environment. Use the tip of a pen or a small screwdriver to move the switch.

• 0dB: For quiet to normal vocal performance.

• –10dB: For loud vocal performance.

BIAS

AUDIO

0dB

-10dB a b

SLX mute select

25A1090 (Rev.3)

2

a

Incompatible

MASTER LIST

GROUP CHANNEL

i8 i8 select b

Incompatible

MASTER LIST

GROUP

CHANNEL

i8 i8 select

SLX2 Transmitter Programming

Manually Select a Group and/or Channel

select

5

1.

Press and hold the select button until the GROUP and CHANNEL displays begin to alternate.

2.

To change the group setting, release the select button while GROUP is displayed a

. While GROUP is flashing, pressing select increases the group setting by one.

3.

To change the channel setting, release the select button while CHANNEL is displayed b

. While

CHANNEL is flashing, pressing select increases the channel setting by one.

Incompatible

MASTER LIST

GROUP CHANNEL

i8 i8

Lock or Unlock Transmitter Settings

select

+

Press the mute/ and select buttons simultaneously to lock or unlock the transmitter settings. When locked, the current settings cannot be changed manually. Locking the transmitter does not disable in-

frared synchronization.

Incompatible

MASTER LIST

GROUP CHANNEL

i8 i8

Incompatible

MASTER LIST

GROUP CHANNEL

i8 i8

Battery Status

Indicates charge remaining in transmitter batteries.

Master List Indicator

Indicates that a master list frequency is currently in use. No group or channel information is displayed.

Note: the transmitter cannot be used to change master list settings.

Incompatible

MASTER LIST

GROUP CHANNEL

i8 i8

INCOMPATIBLE Frequency Warning

The INCOMPATIBLE warning indicates that the receiver and transmitter are transmitting on different frequency bands. Contact your Shure retailer for assistance.

25A1090 (Rev.3)

3

AUDIO/RF BLOCK DIAGRAM

User Gain

Control Switch

Preemphasis

VCA

2-pole,

17kHz,

LPF

Audio Input

(mic head)

EPROM

Limiter

IR

LCD

Photodetector

32.768 kHz

LCD

Driver

Microcontroller

Tone Key

Frequency

Synthesizer control

Channel

Select,

Power Mute

Compressor

RF Muting

Audio Muting

Deviation Trim and Tone Key

Sum Amp

RMS

Detector

VCO (Carrier

Range)

LPF

AA Battery

Supply

RF

Amp

Pad

0-4 dB (Band dependent)

DC-DC

Converter

+5V DC

Source

RF

Amp

Pad

0-4 dB (Band dependent)

Loop

Filter

Frequency

Synthesizer

16

MHz

CIRCUIT DESCRIPTION

AUDIO CIRCUIT DESCRIPTION

AUDIO SECTION

Audio enters the transmitter board through pin 4 of the mic-jack board connector (CON100).

Pin 2 of the connector provides 5 Vdc bias for the mic head. Pin 6 supplies the ground connection. The audio preamp (IC150-2) provides either 0 or 10 dB of gain (user switchable via

SW100). Capacitor C140 couples the signal into a pre-emphasis network formed by R140, R141, and C141.

Next, the audio signal enters the patented Shure ARC™ processor. The main elements in this section are the VCA (IC100-5) and the RMS Detector (IC100-4). The VCA, or Voltage Controlled

Amplifier, is a DC controlled amplifier. Following the VCA, the signal enters a 3-pole 17kHz lowpass filter stage (IC100-2) that protects the RMS detector from energy above the audio band.

Next, the signal is coupled to the RMS detector (IC100-1), which converts it to a DC voltage. A

+1 dB increase at the input to the detector produces a +6 mV increase at its output. The detector output is fed to the compression threshold stage (IC150-2). This stage provides the transition from uncompressed to compressed signal. At low levels, the audio is uncompressed because diode D169 is turned off. As the AC level increases, the output of IC150-2 decreases enough to turn the diode on. As D190 conducts, the compression ratio changes from 1:1 to 5:1. Once D190 is turned fully on, the audio compression ratio remains fixed at 5:1. An additional diode in the bias

4

25A1090 (Rev.3)

network (D162) provides temperature compensation for changes in the V

Y

, or "cut-in" voltage of

D190. After the compression threshold stage, the DC control signal is amplified by a 40 dB fixedgain stage (IC100-5). It is then sent to the VCA control voltage input (EC+).

Following the ARC™ processor section, the audio signal must pass through a muting network consisting of R199, R200, C205, and Q205. A trim pot (TR200) allows the audio deviation level to be set. Next, audio enters the tone key summing amp (IC150-4). Here, tone-key is added to the audio before passing to the RF section for transmission. The tone key signal is used in the receiver to provide audio output only when the tonekey signal is present with the transmitted signal; therefore, if the tone key or the transmitter is turned off, the receiver will be muted. The tone key squelch will eliminate receiver noise associated with loss of the carrier, which usually sounds like a "pop". The tone key signal is generated by a square wave from the mP (IC300). It is then filtered by active filter stage Q185 and attenuated by R188/R189 (under µP control) before being fed to the summing amplifier. The combined audio/tone-key signal is then sent to the VCO through R504.

POWER SECTION

Two "AA" batteries supply power to the transmitter through FET Q410, which provides electrical reverse battery protection. Next, power enters switching boost converter IC400, which supplies regulated 5V power. To turn on the transmitter, SW325 shorts the base of Q480 to ground, enabling the converter and powering up the unit. The microprocessor keeps Q480 disabled until shutdown.

Power is turned off by a "shutdown" signal from the microprocessor, which can be initiated manually by the user (by holding down SW325 for 2.2 seconds) or automatically by the system

(e.g., when the battery is too weak for proper operation). At this time, the microprocessor enables

Q480 and shuts down the converter. When the unit is off, Q480 and its bias circuitry draw less than 30 µA, so the effect on battery life is negligible. The converter and microprocessor are disabled.

LOW BATTERY SHUT DOWN:

A software battery shutdown routine allows the battery supply to run down to 2.05 V before shutdown, and will not turn the system back on until a voltage greater than 2.25 V is present. The hysteresis keeps the system in a controlled state when the batteries are low, and also helps prevent weak batteries from being used from the start.

RF CIRCUIT DESCRIPTION

RF SECTION

The system block diagram is shown above. The SLX2 uses a PLL system with direct carrier frequency modulation. Processed audio enters the VCO through a passive "reflection" network before being applied to the varactor diode (D500) through choke L503. The VCO is shielded to prevent external RF fields from affecting its operation, and to help control radiated emissions of its harmonics. Power for the VCO and PLL circuitry is supplied by the main 5 V regulator. Power and signal lines in the VCO area are heavily decoupled and bypassed to remove noise.

The VCO has a tuning bandwidth of more than 30 MHz on all bands, with a tuning voltage range of approximately 1 to 4 volts. The VCO employs separate stages for the oscillator (Q502) and buffer (Q501) to minimize phase noise and load pulling. The VCO output is isolated by capacitive and resistive dividers, before being applied to the frequency control pin of the PLL synthesizer (IC501) through C538. The synthesizer's internal circuitry divides the RF signal down as necessary to achieve a tuning precision of 25 kHz. The synthesizer circuit contains a quartz-controlled reference oscillator operating from a 16 MHz reference crystal (Y801) that is adjusted by means of trimmer CV501. The transmitter output frequency is user selectable in groups of compatible channels within each of the eight available bands. Frequency selection is made via microprocessor controller IC300, which interfaces with the user by means of the Group and

Channel switches, SW324 and SW325. The output of the synthesizer is a series of pulses that are integrated by a passive loop filter consisting of C532, R514, C533, R513, and C531 to produce the control voltage signal.

The VCO output is coupled to the RF buffer stage (Q600) by a matching network consisting of R602, C614, and L610. R600 and R603 provide base bias for the transistor, while R605 sets its operating current. RF choke L600 provides power and decoupling for the stage, in conjunction

25A1090 (Rev.3)

5

with C600 - C604. The collector of Q600 feeds the power amplifier stage via an impedance matching network consisting of L602, C611, and C618.

The bias voltage for the RF power amplifier (Q601) is supplied by R601 and R604. Its operating current is controlled via emitter resistor R606. RF choke L601 provides power and decoupling for the stage, in conjunction with C605-C609. For Japanese systems only, the output power is trimmed via TR640. L603, C612, and L604 provide the output impedance matching into the low pass filter, which consists of L604, L605, L606, C615, C616, and C617. The low pass filter output couples to the battery antenna via C641 and L607. Connector CON640 and C613 are only used for Japanese (JB) units. Coupling capacitor C610 is used to ensure that both batteries are driven equally.

The transmitter is capable of delivering up to +15.0 dBm to the antenna (depending on band and country). During transmitter power-up and frequency selection, the RF output is muted by bringing the base of Q631 low, which removes bias from Q630 and shuts down power to the RF stages. The RF output is also muted during the transmitter power-down sequence. This is done so that the carrier signal will not interfere with other transmissions when the loop becomes unlocked.

DIGITAL CIRCUIT DIAGRAM

Backlight

LED

RF Band

DC Level

Power LED

Battery DC

Level

Power Mute

Button

Microprocessor

(Motorola

MC68HC908GR16)

LCD Driver

(Rohm

BU9729k)

LCD

Sythesizer

(National

Semiconducter

LMX2335)

VCO

RF Power

Select

Button

Softstart

Shutdown

Infrared

Photodetector

(Sharp GP1U10X)

EEPROM

(MicroChip

93AA46 )

Audio Mute

Tonekey

Squarewave

Tonekey

Level

25A1090 (Rev.3)

6

DIGITAL SECTION

ACCESSING DIFFERENT MODES

ATE MODE

If TP_PB0 is held to TP_EGND, or logic level 0, at startup, the microcontroller will enter ATE

Mode. To ensure proper operation, TP_PA0 and TP_PA1 should be held to TP_EGND at startup.

In ATE Mode, each band has a three test frequencies that are controlled by the logic levels at test points TP_PA0 and TP_PA1.

Test Frequencies (MHz)

SLX2

Low

Center

High

H5

518.400

529.500

541.800

J3

572.400

583.500

595.800

Frequency

Low

Center

High

JB

806.125

807.500

809.750

L4

638.400

649.500

661.800

TP_PA0 TP_PA1

0

0

1

0

1

1

P4

702.100

714.000

725.900

Q4

740.125

746.325

751.875

R5

800.525

810.275

819.800

S6

838.100

851.300

864.800

RF BAND RESISTORS

Two resistors (R

A

and R

B

) are responsible to start the microcontroller in a RF band. They determine the voltage at test point TP_RFBAND.

This table shows R

A

's and R

B

's reference designators and how the voltages at the test points reflect the operating RF band.

SLX Reference Designators

SLX2

R

A

R319

R

B

R320

.

This figure depicts the voltage divider feeding the microprocessor analog to digital converter.

25A1090 (Rev.3)

7

This table shows the variant resistor values and resulting voltages at TP_RFBAND for each band.

Rb

R5

S6

P4

Q4

JB

RF BAND

H5

J3

L4

1.00k

2.99k

4.99k

7.50k

12.10k

18.2k

30.1k

49.9k

TP_RFBAND(+/- 0.10V)

0.30V

0.76V

1.10V

1.41V

1.81V

2.13V

2.48V

2.75V

Note: Voltages are calculated with a 3.30V (+/- 0.10V) reference from the power

supplies. If power section supports less than 3.30V, thresholds need to be adjusted.

µC DECISIONS BASED ON ANALOG VOLTAGES

BATTERY_A2D

Measured @ 3V block battery clips

Continuous Operation Battery Thresholds

RF Level

- dBC

Display Logic

>=

Voltage (V)

2.25

- dBC < 2.25

- dBC

-8 dBC

<

<

2.14

2.05

Note: There is a dead battery lock voltage set at 2.30 Volts. If the transmitter is powered on with a voltage of less than 2.30 Volts, the system will lock, forcing the user to either recharge or replace the batteries. During the dead battery lock out, the battery gauge is empty and the red led flashes.

25A1090 (Rev.3)

8

NOTES

25A1090 (Rev.3)

9

FUNCTIONAL TEST

REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):

Spectrum analyzer or power meter

Digital multimeter

Audio Analyzer

Frequency Counter

Power Supply

Shielded test lead

BNC (Male) to BNC (Male) cable (1)

UA820 Antenna

Audio Test Head

Brass Ring

HP8590L/Agilent E4403B/Agilent E4407B

Fluke 87

HP 8903B

HP 53181/HP 5385A

Power Supply must be able to supply 3Vdc with an internal ammeter.

Shure PT1838F

Shure PT1838A

Frequency Dependent

PT1840

PT1838Y

LISTENING TEST

Before completely disassembling the transmitter, operate it to determine wether it is functioning normally and try to duplicate the reported malfunction. Refer to pages 2 and 3 for operating instructions, troubleshooting, and specifications.

Review any customer complaint or request, and focus the listening test on any reported problem. The following, more extensive, functional tests require partial disassembly.

FUNCTIONAL TEST

Refer to the Disassembly section to partially disassemble the transmitter for the following functional tests.

TEST SETUP

1.

Remove the PCB from the handle.

2.

Set gain switch to “0” dB.

3.

Connect the (+) terminal of the power supply through a milliammeter to the (+) battery terminal and the (-) power supply terminal to the (-) battery terminal.

4.

Connect a DC Voltmeter across the power supply and set the power supply for 3Vdc.

5.

Connect the audio analyzer to the microphone via the microphone test head (PT1840) as needed.

DISPLAY TEST

1.

Power unit ON.

2.

Verify that all display segments are displayed for approximately 2 seconds. This includes a full battery indication and "1818" displayed for group and channel.

REVERSE BATTERY PROTECTION TEST

1.

Adjust power supply to -3.0 ± 0.1 V dc.

2.

The current should be less than 0.5 mA.

VOLTAGE REGULATION TEST

With power applied properly, and the unit switched on, measure the DC voltages at the following test points. All test points are located on the top side of the PCB. Refere to the component diagram.

• TPBATT+ (Battery input) = 3 ± 0.2 Volts

• TP5V (Power Converter) = 5 ± 0.2 Volts

• TP3.3V (Power Converter) = 3.3 ± 0.2 Volts

• TPA1 (Audio Preamp) = 2.5 ± 0.2 Volts

• TPA3 (Tone Key Summing Amp (IC150 Pin 14)) = 2.5 ± 0.2 Volts

• TPVREF (IC100 Pin 5) = 2.5 ± 0.1 Volts

CURRENT CONSUMPTION TEST

1.

With +3V applied to the battery terminals and the unit powered on.

2.

Verify the current drain is 130 ± 15mA.

10

25A1090 (Rev.3)

25A1090 (Rev.3)

FREQUENCY RESPONSE TEST

1.

Set the audio generator as follows:

• Frequency = 1 kHz

• Amplitude = -20 dBu

• Filters = 30 kHz LPF

2.

With the audio analyzer, probe TPA2 (top side), it should read -3.4dBu ± 0.5dB. Record this level using the Ratio button. This level will be used as your reference level for the following test.

3.

Change the generator's frequency to 100Hz and measure the level at TPA2 to be -2.2dB ± 0.2dB relative to the 1kHz reference level.

4.

Change the generator's frequency to 10kHz and measure the level at TPA2 to be +2.3dB ± 0.2dB relative to the 1kHz reference level.

5.

Disengage the Ratio button.

DISTORTION TEST

1.

Set the audio generator frequency to 1kHz with an amplitude of -20.0dBu.

2.

Activate the 30kHz LPF on the audio generator.

3.

Measure the total harmonic distortion and noise (THD+N) at TPA2 to be less than 0.7%.

RADIATED RF OUTPUT POWER AND FREQUENCY STABILITY TEST

1.

Choose any group and channel free of interference. Using a spectrum analyzer with the appropriate-band UA820 antenna, measure the approximate near field radiated power as follows:

• SPAN=100 MHz

• REF LVL=10dBm

• FREQUENCY=(Look at tables on pages 18 thru 23)

2.

Extend the UA820 away from the analyzer into the horizontal plane (straight out). Align the SLX2 antenna parallel to the UA820 as close as possible. Move the unit along the UA820 antenna until you find a maximum peak.

3.

Do a peak search and measure the power to be at least 2 dBm for H5, J3, L4, and P4 bands and at least 0 dBm for Q4, R5, JB, and S6 bands.

4.

Set SPAN to 200 KHz. Measure the frequency to be within +/- 3 kHz of the nominal frequency you are testing. (See frequency tables on pages 19 to 24).

TONE KEY LEVEL TEST

1.

Set Power Supply to 3.0VDC

2.

Find transmitting carrier on the spectrum analyzer with a span of 200 kHz. Use the "Peak Search,

Marker Delta, Next Peak" soft-keys on the analyzer.

3.

Measure the 32.768 kHz tone key level to be -21 dBc ± 1.5 dB.

4.

Set Power Supply to 2.1 V (1 segment on LCD battery icon).

5.

Measure the 32.768 kHz tone key level to be -14 dBc ± 1.5 dB.

OCCUPIED BANDWIDTH TEST (JB model only)

1.

Set transmitter gain to maximum.

2.

Set up the HP-8591E spectrum analyzer to measure Occupied Bandwidth with the following settings:

• Percentage Power = 99.5%

• Channel Spacing = 250 kHz

• Bandwidth = 110 kHz

3.

Connect the audio generator to TQG connector CON90. Use a 1 kHz tone with a level that gives -

23.47 dBu (52mV) at TPA3.

4.

Increase the audio level by 36dB.

5.

Measure Occupied Bandwidth to be less than 110 kHz.

ADJACENT CHANNEL POWER TEST (JB model only)

1.

Set the spectrum analyzer, and audio input level to the same settings as stated in “Radiated RF

Output Power and Frequency Stability” and “Distortion Test”.

2.

Measure Extended Adjacent Channel Power to be less than -60 dB.

IF ALL TEST PASSED, THIS MEANS THE UNIT IS PROPERLY FUNCTIONING, AND

NO ALIGNMENT IS REQUIRED.

11

ASSEMBLY AND DISASSEMBLY

!CAUTION!

Observe precautions when handling this static-sensitive device.

EXPLODED VIEW

25A1090 (Rev.3)

0008

0009

0010

0012

0014

0015

0016

0017

I.D. #

0001

0002

0003

0004

0005

0006

0007

0018

0019

0022

Description

Cartridge

Tuned PCB assembly

PCB assembly, IR

PCB, head board

Contact

Frame, internal

Retaining ring bezel, painted/printed

Pushbutton actuator, silicone

Battery cup, painted

Shield cover, steel, plated

3 pin interconnect

PCB Screw, hi-lo #4

Handle assembly

Battery holder assembly

Battery holder, Machine screw, #2–56

Nameplate, frequency

Battery cover assembly

Part Number

200--082

190A098-01

190-057-03-34

53F2039A

65B8467

30A1314

65A8475B

66A8070

65BA8451

53A8590A

170A74

30J1245

95A9047B

95B9048

30D443E

39--8466

95A9068

12

SERVICE PROCEDURES

MEASUREMENT REFERENCE

NOTE: Audio levels in dBu are marked as dBm on the HP8903.

dB Conversion Chart

0dBV = 2.2 dBu

0dBu = 0dBm assuming the load = 600 ohms

Be aware that dBu is a measure of voltage and dBm is a measure of power. The HP8903, for example, should be labeled dBu instead of dBm since it is a voltage measurement. These two terms are often used interchangeably even though they have different meanings.

REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):

Spectrum analyzer or power meter

Digital multimeter

Audio Analyzer

RF Signal Generator

Frequency Counter

Receiver

50 ohm, RG-174 BNC to open (stripped) coaxial cable or "rocket launcher" tip (P/N

95A8278). For JB, Murata cable #

MXGS83RK3000 may be used.

Audio Test Head

Brass Ring

BNC (Male) to BNC (Male) Cable (2)

DC Blocker

XLR (Female) to Banana Plug Adapter

20 dB Attenuator

Toray non-inductive tuning tool - BLUE

Toray non-inductive tuning tool - PINK

HP8591E/Agilent E4403B/Agilent E4407B

Fluke 87

HP 8903B

HP 8656B or HP E4400B

HP 53181/HP 5385A

Matching SLX4 Receiver

Shure PT 1824

Shure PT1840

Shure PT1838Y

Shure PT1838A

Shure PT1838W

Shure PT1841

Shure PT1838T

Shure PT1838K

Shure PT1838L

25A1090 (Rev.3)

13

ALIGNMENT PROCEDURE

Alignment and Measurement Procedure

The alignment procedure is sequential and does not change unless specified. Use RG58 or other low loss 50 ohm cables for all RF connections. Type RG174 (thin) 50 ohm cables can be used for short (e.g. 6 inch) runs. Keep RF test cables as short as possible. Include the insertion loss of the cables and the connectors for all RF measurements. DC voltages are present at most

RF test points. Use DC blocks to protect the test equipment, if necessary. All audio analyzer filters should be OFF unless otherwise specified.

VOLTAGE REGULATION CHECK

With power applied properly, and the unit switched on, measure the DC voltages at the following test points. All test points are located on the top side of the PCB. Refere to the component diagram.

Test Points

TPBATT+ (Battery input)

TP5V (Power Converter)

TP3.3V (Power Converter)

TPA1 (Audio Preamp)

TPA3 (Tone Key Summing Amp,

(IC150 Pin 14))

TPVREF (IC100 Pin 5)

Voltages

3 ± 0.2 Volts

5 ± 0.2 Volts

3.3 ± 0.2 Volts

2.5 ± 0.2 Volts

2.5 ± 0.2 Volts

2.5 ± 0.1 Volts

Frequency

Level

LOW

MID

HIGH

GRP. 1 /

CH. 1

GRP. 4 /

CH. 7

GRP. 6 /

CH. 12

H5

INITIAL SETUP

1.

Proper adapters should be used to connect the test equipment.

2.

Apply +3 V to the battery terminals with the proper polarity.

3.

Set audio gain switch SW100 to "-10 dB".

4.

Remove L641 to disengage the antenna (ALL EXCEPT JB).

5.

Solder the center of a 50

Ω unshielded test cable (PT1824) to the node between L606 and

L641, and the shield to ground.

6.

Connect the audio generator output to the Mic Test Head input of the transmitter as required.

7.

Turn on the SLX2 by pressing and holding the POWER button, SW325

.

J3 JB L4 P4 Q4 R5 S6

GRP. 1 /

CH. 1

GRP. 4 /

CH. 7

GRP. 6 /

CH. 12

GRP. 1 /

CH. 5

GRP. 1 /

CH. 2

GRP. 5 /

CH. 4

GRP. 1 /

CH. 1

GRP. 4 /

CH. 7

GRP. 6 /

CH. 12

GRP. 14 /

CH. 1

GRP. 14 /

CH. 5

GRP. 15 /

CH. 10

GRP. 1 /

CH. 1

GRP. 1 /

CH. 5

GRP. 1 /

CH. 8

GRP. 4 /

CH. 1

GRP. 4 /

CH. 7

GRP. 2 /

CH. 11

GRP. 13 /

CH. 1

GRP. 14 /

CH. 7

GRP. 3 /

CH. 13

RF TUNING

The removal of L641 (prevents antenna loading of output).

VCO Tuning

:

1.

Set transmitter to its LOW frequency as indicated in the table above.

2.

WIth a DC meter probe TP_PLL_TV (top).

3.

Tune CV500 to obtain 1.10-1.40 Vdc at TP_PLL_TV. For Q4 units, this voltage should read between 1.45-2.25 Vdc. For JB units, this voltage should read between 1.75-2.05

Vdc.

4.

Set the transmitter to HIGH frequency.

5.

Verify voltage at TP_PLL_TV is less than or equal to 4.3 V DC.

14

25A1090 (Rev.3)

25A1090 (Rev.3)

FREQUENCY ALIGNMENT :

1.

Set the transmitter to MID frequency (see table on page 14).

2.

Connect the 50

Ω cable to a frequency counter.

3.

Adjust variable capacitor CV501 until the frequency counter measurement matches the appropriate frequency on the table below, ± 1 kHz. .

GROUP CODE

H5

J3

JB

L4

P4

Q4

R5

S6

FREQUENCY RANGE

529.500 Mhz ± 1 kHz

583.500 Mhz ± 1 kHz

807.500 Mhz ± 1 kHz

649.500 Mhz ± 1 kHz

714.000 Mhz ± 1 kHz

746.325 Mhz ± 1 khz

810.275 Mhz ± 1 kHz

851.300 Mhz ± 1 kHz

RF OUTPUT POWER

The output power measurement ensures that the output signal is strong enough for sufficient range when the system is in use. The output power measurement also verifies tha the output power is not above the specified maximum level, to ensure compliance with regulatory angencies’ standards.

1.

RF output power is only adjustable on and JB units. Use RG58 (PT 1824) or any other low loss 50

Ω cables for all RF connections.

2.

Include the insertion loss of the cables and connectors in rf conductive power measurements.

3.

Connect the RF output of the transmitter to a spectrum analyzer.

4.

Set the spectrum analyzer center frequency to match the transmitter frequency.

5.

Using a power meter or spectrum analyzer, verify the output power matches the range indicated in the table below. JB models can be adjusted at TR640.

GROUP

H5

J3

JB

L4

P4

Q4

R5

S6

Pout RANGE

14 dBm ± 2 dB

14 dBm ± 2 dB

7.0 - 10.8 dBm

14 dBm ± 2 dB

14 dBm ± 2 dB

10 dBm ± 2 dB

13 dBm ± 2 dB

10 dBm ± 2 dB

6.

Remove the BNC to unterminated test cable (PT1824) and replace L641 to reconnect the antenna.

DEVIATION ADJUSTMENT

Deviation must be set to make sure the companding systems between the transmitter and receiver correctly track each other. The level coming out of the transmitter’s audio compressor must match the level going into the receiver’s audio expander. A fixed gain structure does not ensure exact match, primarily because of variations in voltage-controlled oscillators (VCO’s).

USING A SLX4 RECEIVER

The following procedure requires a SLX4 receiver. It is recommended that a properly tuned receiver be used to perform the transmitter deviation adjustment.

15

25A1090 (Rev.3)

RECEIVER SETUP

SLX4 RECEIVER

Output:

Unbalanced

Gain:

Maximum

Toke Key:

Disabled (R280)

AUDIO ANALYZER

Measurement: AC level

Filters:

Low-Pass (30 kHz): ON

High-Pass (400 Hz): ON

RF SIGNAL GENERATOR

INT: FM

FM RATE: 1kHz

Amplitude: -50 dBm

Deviation: 33 kHz

1.

The SLX2 transmitter should be powered OFF for this procedure.

2.

Connect the rf signal generator to any of the antenna inputs on the receiver. Make sure the

dc block is on the rf signal generator.

3.

Set rf signal generator to the same frequency as the SLX2 transmitter.

4.

Set rf signal generator modulation to 1 kHz and deviation to 33 kHz.

5.

Set the amplitude of the rf signal generator to -50 dBm.

6.

Disable tonekey by shorting the pads of R280 on the receiver.

DEVIATION REFERENCE LEVEL

1.

Power ON the receiver.

2.

Connect the unbalanced output of the SLX4 receiver to the audio analyzer input.

3.

Note the voltage obtained. This is the deviation reference voltage.

4.

Disconnect the rf signal generator from the SLX4.

5.

Power OFF the receiver and remove the short on the R280 pads to enable tonekey.

RADIATED DEVIATION REFERENCE VOLTAGE

SLX2 TRANSMITTER

Power:

+3 Vdc

Atennuation:

-10 dB

Channel:

See Table

Group:

See Table

AUDIO ANALYZER

Measurement: AC level

Output: 1 kHz

Filters:

Low-Pass (30 kHz): ON

High-Pass (400 Hz): ON

1.

Connect the audio analyzer output to the Mic Test Head input of the transmitter.

2.

Power ON the receiver.

3.

Apply +3V to the battery terminals on the SLX2 and power up the unit.

4.

Set the audio analyzer frequency to 1kHz.

5.

Adjust the audio analyzer amplitude level (typically = -6.5 dBu) to obtain -13 dBu ± 0.1dB at TPA1. (This corresponds to -9 dBu ± 2dB at the audio input (TPA0)).

6.

Adjust TR160 to obtain -3 dBu ± 0.15dB at TPA2.

7.

Place the transmitter closer than 12 inches (36 cm) to the receiver.

8.

Connect both antennas on the receiver.

9.

Connect the unbalanced output of the receiver to the audio analyzer.

10.

Adjust TR200 until the ac voltmeter connected to the receiver unbalanced output reads the same deviation reference voltage ± 0.1dB, as measured above.

(TR200 adjusts the deviation for 33 kHz, 100% modulation.)

If successful in the alignment of the unit, assemble it back together as indicated on page 12. If not successful refere to our Bench Checks section on page28.

16

NOTES:

25A1090 (Rev.3)

17

FREQUENCY TABLES

H5: 518.000 - 542.000 MHz

4

5

2

3

1

Preprogrammed frequencies in total: > 120

Group 1

518.400

Group 2

519.250

521.500

523.575

525.050

527.425

520.500

522.225

524.725

526.350

8

9

6

7

10

11

12

Explanation of group content

529.200

532.450

533.650

535.275

537.775

539.500

540.750

Full Range even distribution for each

TV-CH (option 1)

527.550

530.800

532.575

534.950

536.425

538.500

541.600



Group 3

518.200

519.675

520.800

522.450

523.750

526.200

528.325

532.225

534.525

536.575

539.600

541.575

Full Range max. # of frequencies for CH-

22 (option 1)

Group 4

519.775

522.500

524.200

525.600

526.700

528.250

529.500

533.100

535.425

537.450

538.775

540.900


23 (option 1)

Group 5

519.100

521.225

522.550

524.575

526.900

530.500

531.750

533.300

534.400

535.800

537.500

540.225


24 (option 1)

Group 6

518.425

520.400

523.425

525.475

527.775

531.675

533.800

536.250

537.550

539.200

540.325

541.800


25 (option 1)

J3: 572.000 - 596.000 MHZ


6

7

4

5

2

3

1

8

9

10

11

12


Group 1

572.400

575.500

577.575

579.050

581.425

583.200

586.450

587.650

589.275

591.775

593.500

594.750

Full Range even distrobution for each


Group 2

573.250

574.500

576.225

578.725

580.350

581.550

584.800

586.575

588.950

590.425

592.500

595.600

Full Range even distrobution for each


Group 3

572.200

573.675

574.800

576.450

577.750

580.200

582.325

586.225

588.525

590.575

593.600

595.575


31 (option 1)

Group 4

573.775

576.500

578.200

579.600

580.700

582.250

583.500

587.100

589.425

591.450

592.775

594.900


32 (option 1)

Group 5

573.100

575.225

576.550

578.575

580.900

584.500

585.750

587.300

588.400

589.800

591.500

594.225


33 (option 1)

Group 6

572.425

574.400

577.425

579.475

581.775

585.675

587.800

590.250

591.550

593.200

594.325

595.800


34 (option 1)

18

25A1090 (Rev.3)

JB: 806.000 - 810.000 MHZ

Preprogrammed frequencies in total: 21

2

3

1

4


Group 1

806.250

807.500

809.625

Group 2

806.375

808.625

809.750

Group 3

806.125

807.375

809.500

Full Range max. # of compatible frequencies (option

1)


2)


3)

Group 4

806.500

807.375

808.625

809.625


4)

Group 5

806.125

807.375

808.375

809.750


5)

Group 6

806.250

807.250

808.500

809.375


6)

L4: 638.000 - 662.000 MHZ

10

11

12

8

9

6

7

4

5

2

3

1


Group 1

638.400

Group 2

639.250

641.500

643.575

645.050

647.425

640.500

642.225

644.725

646.350

649.200

652.450

653.650

655.275

657.775

659.500

660.750

647.550

650.800

652.575

654.950

656.425

658.500

661.600






Group 3

638.200

639.675

640.800

642.450

643.750

646.200

648.325

652.225

654.525

656.575

659.600

661.575


42 (option 1)

Group 4

639.775

642.500

644.200

645.600

646.700

648.250

649.500

653.100

655.425

657.450

658.775

660.900


43 (option 1)

Group 5

639.100

641.225

642.550

644.575

646.900

650.500

651.750

653.300

654.400

655.800

657.500

660.225


44 (option 1)

Group 6

638.425

640.400

643.425

645.475

647.775

651.675

653.800

656.250

657.550

659.200

660.325

661.800


45 (option 1)

25A1090 (Rev.3)

19

P4: 702.000 - 726.000 MHZ

3

4

1

2

Preprogrammed frequencies in total:

148

12

Group 1

12

Group 2

702.200

704.200

707.200

709.425

703.750

705.975

707.200

708.850

7

8

5

6

9

10

11

12


711.000

713.675

715.575

717.050

719.150

720.800

722.025

724.250

Full Range max. # of compatible frequencies

(option 1)

710.950

712.425

714.325

717.000

718.575

720.800

723.800

725.800

Full Range max. # of compatible freque-cies

(option 2)

12

Group 3

703.650

705.650

708.650

710.875

712.450

715.125

717.025

718.500

720.600

722.250

723.475

725.700


(option 3)

10

Group 4

702.750

704.500

705.750

708.250

711.250

712.500

10

Group 5

703.750

705.750

708.250

711.750

714.500

715.750

9

Group 6

702.100

704.025

705.500

708.500

710.100

712.025

9

Group 7

704.775

706.225

710.500

712.025

714.225

716.900

10

Group 8

702.300

704.975

706.775

709.100

710.300

712.225

11

Group 9

703.000

706.025

708.000

710.300

712.225

716.000

715.250

718.750

721.250

723.250

718.750

721.250

722.500

724.250

713.500

717.300

725.300

718.500

720.775

725.300

714.775

716.700

724.000

725.900

717.100

719.000

720.225

722.775

724.700

France preferred:

User Group A

(option 1)


User Group A

(option 2)


User Group B

(option 1)


User Group B

(option 2)


User Group C

(option 1)


User Group C

(option 2)

P4: 702.000 - 726.000 MHZ CONTINUED

7

8

5

6

3

4

1

2

9

10

11

12


6

Group 10

702.200

703.300

704.700

705.800

707.675

708.775

6

Group 11

710.200

711.300

712.700

713.800

715.675

716.775

Optimized TV channels: TV ch.

50 702-710 MHz


51 710-718 MHz

5

Group 12

718.200

719.300

10

Group 13

702.550

705.600

720.700

721.800

707.500

709.000

723.675

711.500

715.100


52 718-724 MHz

717.000

720.000

723.500

725.900

Compatible setup for use with

PSM400-P3 (P4 >

P3)

8

Group 14

702.100

704.700

710.300

712.400

714.000

716.500

719.400

721.300


PSM400-P3 (P4 =

P3)

10

Group 15

702.700

704.700

709.450

711.500

714.500

716.550

719.900

722.000

724.700

725.900


PSM400-HF (P4 >

HF)

8

Group 16

702.500

705.500

707.000

712.200

714.100

716.400

719.500

722.200


PSM400-HF (P4 =

HF)

25A1090 (Rev.3)

20

Q4: 740.000 - 752.000 MHZ

7

8

5

6

3

4

1

2


36

Group 1

740.125

Group 2

740.125

741.500

743.375

741.950

743.500

744.600

746.325

745.675

747.400

748.500

750.050

748.625

750.500

751.875

751.875

9

10



(option 1)

Full Range max. # of compatible freque-cies

(option 2)

Group 3

740.125

741.225

742.925

744.325

745.425

746.875

748.925

750.175

751.200

751.875


(option 3)

Group 4

740.125

740.800

741.825

743.075

745.125

746.575

747.675

749.075

750.775

751.875


(option 4)

25A1090 (Rev.3)

21

R5: 800.000 - 820.000 MHZ

3

4

1

2


113

11

Group 1

11

Group 2

801.250

804.825

806.975

808.800

801.225

804.800

806.950

808.775

7

8

5

6

9

10

11


810.325

811.550

813.175

815.275

816.650

818.650

819.750

Full Range max. # of comp. Frequencies & FIN

/ NOR / DEN

(option 1)

810.300

811.525

813.150

815.250

816.625

818.625

819.800

Full Range max. # of comp.

Frequencies &

FIN / NOR / DEN

(option 2)

11

Group 3

800.950

802.950

804.325

806.425

808.050

809.275

810.800

812.625

814.775

818.350

819.775

Full Range max. # of comp.

Frequencies &

FIN / NOR / DEN

(option 3)

9

Group 4

800.525

801.925

803.650

804.850

807.400

808.525

8

Group 5

801.475

803.025

805.800

806.950

809.125

810.575

9

Group 6

800.600

802.050

804.275

805.750

806.850

808.550

9

Group 7

800.650

803.125

804.450

806.150

807.250

808.725

810.275

811.550

811.725

813.800

809.875

812.350

810.950

812.400

813.775

813.450

813.500

Germany preferred: User

Group 4 800-814

MHz (option 1)

Germany preferred: User

Group 4 800-814

MHz (option 2)

Sweden preferred: 800-

814 MHz (option

1)

Sweden preferred: 800-

814 MHz (option

2)

R5: 800.000 - 820.000 MHZ CONTINUED

3

4

1

2

7

8

5

6


7

Group 8

806.000

807.100

808.500

809.600

811.475

812.575

813.975

7

Group 9

806.025

807.425

808.525

810.400

811.500

812.900

814.000


EUT-TL-TV (R5

> TL-TV)


PSM400-MN (R5 >

MN)

3

Group 10

801.400

808.300

8

Group 11

800.900

802.100

816.400

806.200

809.300

814.100

816.100

817.200

819.600


PSM400-MN (R5 =

MN)


PSM200-R8 (R5 >

R8)

6

Group 12

801.200

803.800

805.900

807.000

809.200

811.700

8

Group 13

803.850

807.000

809.700

811.050

813.900

816.500

817.600

819.500


PSM200-R8 (R5 =

R8)


EUT-TL-TV (R5

> TL-TV)

6

Group 14

806.150

811.650

814.400

816.500

817.450

819.300


PSM400-MN (R5 >

MN)

25A1090 (Rev. 3)

22

S6: 838.000–865.000 MHZ

3

4

1

2


119

13

Group 1

13

Group 2

838.200

841.450

843.275

846.225

838.150

839.375

841.300

842.475

9

10

11

12

7

8

5

6

13


847.350

850.125

852.575

854.575

856.200

860.125

861.300

863.225

864.450

Full Range max.

# of compatible frequencies

(option 1)

846.400

848.025

850.025

852.475

855.250

856.375

859.325

861.150

864.400

Full Range max.


(option 2)

13

Group 3

838.550

839.775

841.700

842.875

846.800

848.425

850.425

852.875

855.650

856.775

859.725

861.550

864.800

Full Range max.


(option 3)

6

Group 4

854.200

855.300

856.700

857.800

859.675

860.775

BEL / TUR preferred: opt. TV ch.69

854-862 MHz

3

Group 5

855.475

857.425

860.600

U.K. preferred:

"CH69 Coordinated" SET

1

3

Group 6

855.075

857.775

860.725

6

Group 7

854.750

855.850

857.250

858.350

860.225

861.325

U.K. preferred:

"CH69 Coordinated" SET

2 or SET 3

U.K. preferred:

"Co-ordinated frequencies"

INDOORS

6

Group 8

854.750

855.850

857.250

858.350

860.225

861.325

U.K. preferred:


OUTDOORS

(option 1)

S6: 838.000–865.000 MHZ CONTINUED

7

8

5

6

3

4

1

2

9

10

11

12

13


6

Group 9

854.425

855.525

857.400

858.500

859.900

861.000

U.K. preferred:


OUTDOORS

(option 2)

2

Group 10

863.200

864.500

European harmonized band: optimized for 863 -

865 MHz

10

Group 11

838.200

839.900

841.000

842.375

844.400

846.100

847.350

849.400

851.800

853.200


EUT-TW-TZ (S6

> TW-TZ)

13

Group 12

838.900

842.600

845.900

847.500

848.600

850.100

852.100

853.300

855.100

857.210

858.650

859.800

861.900


EUT-VR-VT (S6

> VR-VT)

9

Group 13

838.100

841.100

842.700

847.000

849.200

850.400

852.500

854.100

855.300


PSM400-KE (S6 >

KE)

7

Group 14

838.700

842.800

844.800

846.300

847.400

849.200

851.300


PSM400-KE (S6 =

KE)

9

Group 15

838.400

840.600

842.100

844.700

846.600

848.100

850.700

851.850

853.700


PSM200-S5 (S6 >

S5)

25A1090 (Rev. 3)

23

AGENCY APPROVALS

Note: Consult Global Compliance for latest applicable standards

FCC

IC

ETS

TELEC

(H5, J3, L4) - Part 74

(H5, J3, L4) - RSS-123

(H5, J3, L4, P4, Q4, R5, S6,) - EN 300 422 and EN 301 489

(JB) - RCR STD-22

PRODUCT PERFORMANCE CHARACTERISTICS

SPECIFICATION

Operating Frequency (H5)

Operating Frequency (J3)

Operating Frequency (L4)

Operating Frequency (P4)

Operating Frequency (Q4)

Operating Frequency (R5)

Operating Frequency (S6)

Operating Frequency (JB)

Number of User Selectable Channels

Type of Emission

Oscillator

RF Conducted Power Output

Tonekey Signal

Maximum FM Deviation

Dynamic Range

Total Harmonic Distortion

Audio Adjustment Range

Operating Voltage

Power Consumption

Battery Life

Value

518.100 to 541.900 MHz

572.100 to 595.900 MHz

638.100 to 661.900 MHz

702.100 to 725.900 MHz

740.100 to 751.900 MHz

800.100 to 819.900 MHz

838.100 to 864.900 MHz

806.125 to 809.750 MHz

See frequency table

120KF3E

PLL-controlled synthesizer

Band Dependent (See Table 1)

32.768kHz

38 kHz

> 100 dB

< 0.7% (38 kHz deviation, 1 kHz)

-10, 0, or +15 dB; user selectable

3V (2 x AA; alkaline or rechargeable)

130mA ± 15mA @ 3V

> 8 hrs (alkaline batteries)

JB MODEL (CHANGES FROM R5 MODEL)

Operating Frequency

Number of User Selectable Channels

Frequency Stability

Reference FM Deviation1 kHz audio level

Output Power

806 to 810 MHz

16 (125 kHz Spacing)

± 10 ppm

5 kHz -23.47 dBu (52 mV) at TPA0

See Table 1

25A1090 (Rev.3)

24

NOTES

25A1090 (Rev.3)

25

PRODUCT SPECIFICATIONS

MECHANICAL

Overall Dimensions

64 mm x 109 mm x 19 mm (2.50 x 4.30 x 0.75 in.)

Weight

73 grams (2.6 oz), without batteries

Housing

Molded ABS case and battery cover

GENERAL

Frequency Range and Transmitter Output Level

R5

S6

JB

Q4

Band

H5

J3

L4

P4

Range Transmitter output

518–542 MHz 30 mW/15 dBm

572–596 MHz 30 mW/15 dBm

638–662 MHz 30 mW/15 dBm

702–726 MHz 30 mW/15 dBm

800–820 MHz 20 mW/13 dBm

838–865 MHz 10 mW/10 dBm

806–810 MHz 10 mW/10 dBm

740–752 MHz 10 mW/10 dBm

NOTE: This Radio apparatus may be capable of operating on some frequencies not authorized in your region. Please contact your national authority to obtain information on authorized frequencies for wireless microphone products in your region.

Operating Range Under Typical Conditions

100m (300 ft.)

Note: actual range depends on RF signal absorption, reflection, and interference

Audio Frequency Response (+/– 2 dB)

Minimum: 45 Hz

Maximum: 15 kHz

Total Harmonic Distortion (ref. +/– 38 kHz deviation, 1 kHz tone)

0.5%, typical

Signal-to-Noise Ratio

>100 dB A-weighted

Operating Temperature Range

–18°C (0°F) to +50°C (+122°F)

Note: battery characteristics may limit this range

Transmitter Audio Polarity

Positive pressure on microphone diaphragm (or positive voltage applied to tip of WA302 phone plug) produces positive voltage on pin 2 (with respect to pin 3 of low impedance output) and the tip of the high impedance 1/4-inch output.

Gain Adjustment Range

25 dB

Audio Input Level

-5 dBV maximum at mic gain position

+10 dBV maximum at 0 dB gain position

+20 dBV maximum at -10 dB gain position

Input Impedence

1 M

Ω

26

25A1090 (Rev.3)

ENVIRONMENTAL

RF Transmitter Output

30 mW maximum (dependent on applicable country regulations)

Dimensions

254 mm H x 51 mm dia. (10x2 in) including SM58 cartridge

Weight

375.6 grams (13.25 oz) without batteries

Housing

Molded ABS handle and battery cup

Power Requirements

2 “AA” size alkaline or rechargeable batteries

Battery Life

>8 hours (alkaline)

Temperature Storage

7 days at +165 F (+74 F) degrees, unpackaged.

7 days at -20 F (-29 C) degrees, packaged.

After each 7-day storage period, units must be allowed to stabilize for 24 hours before testing.

Units must operate per Section V.

Temperature Cycling

5 cycles from -20 F (-29 C) degrees to +165 F (+74 C) degrees. Allow 24 hours for stabilization before testing. Units must operate per Section V specifications mechanically and electrically.

Operational Temperature

Operate units as described in Section V at +0 F (-18 C) and +135 F (+57.9 C) degrees. Allow three hours for stabilization of each temperature before testing. Units must operate per Section V specifications.

Steady State Humidity

Perform a 10 day test at 90% RH at room temperature. Evaluate units for visual and mechanical defects after 1, 3, 5, 7, and 10 days. At the end of the 10-day period allow the units to recover for 24 hours. Units must pass Section V specifications.

Operational Humidity

Operate units as described in Section V at 90% RH at room temperature.

Allow two days for stabilization.

Moisture Resistance

Perform a 10-day test at 90% to 98% RH with temperature cycled between +14 F (-10 C) and

+150 F (+65 C) degrees. Allow the units to recover for 24 hours. Product must meet Section

V specifications.

Mechanical Shock

Handheld Drop Test: Drop product from a height of 6' onto a hardwood floor for a total of 10 drops. The unit must pass Section V specifications.

Stand Drop Test: Place product on a stand with the appropriate size swivel adapter. Drop unit from a height of 5' onto a hardwood floor for total of 10 drops. The product must meet Section

V specifications.

Electrostatic Discharge

Product will be subjected up to a ± 15 kV air discharge and ± 4 kV contact discharge. Units must operate per Section V specifications.

25A1090 (Rev.3)

27

TROUBLESHOOTING

Servicing will be more efficient when the history of the unit is known and can be taken into account. The service strategy should be different when a unit fails on the production line than when it fails in the field, because if it fails on the line there is a possibility of incorrect or missing parts.

If the unit has failed in the field, check for signs of tampering or hand soldering that could indicate that the customer has modified the unit or has attempted to repair it.

PRELIMINARY TESTS

1.

Install two fresh "AA" batteries and turn the unit on. Verify normal display operation. Set the unit to the lowest frequency in the group.

2.

Observe the radiated output on a spectrum analyzer by holding it near the analyzer's antenna. Measure the frequency and RF power output level and verify that they are within expected limits.

3.

Speak into the microphone. Observe the modulation on the spectrum analyzer display and listen to the audio output on a matching SLX4 receiver tuned to the same channel; preferably the customer's unit, if this is a field return. Check for normal audio level. Listen for distortion, noise, or any unusual sounds.

4.

Change the frequency to the highest frequency in the group. Repeat steps 2 and 3 above and verify that operation is normal.

RF FREQUENCY OR SIGNAL PRESENCE PROBLEMS

If there is no carrier present at the transmitter antenna port or measured RF power is unusually low, check the earlier stages to verify decent continuity of the signal path. An amplifier stage or filter may have a part placement error or other defect. Usually the first step is to visually examine the board for skewed / missing parts before going in with a probe. If there is no signal out of the

VCO output then check the control voltage at TP_PLL_TV when the transmitter is set at the lowest channel in the group. If the voltage is not tunable into the 1.1-1.4 V window but can be tuned to a lower or higher voltage, this means the VCO might be built for the wrong band or has a wrong part.

Check the values of the caps C522, C523, C528, C525, C534, and inductor L505 one by one and try to tune into the window. (Note that these caps are Low-ESR series!) If the voltage at

TP_PLL_TV is 0 V and does not respond to tuning CV500, the loop is unlocked.

Check Y500 for a 16 MHz oscillation by setting the analyzer to CENTER FREQ=16 MHz, REF.

LEVEL=-40 dBm, SPAN=1 MHz. Hold the probe right above the crystal and look for a spike-like signal. If one is present, check the parts in the VCO, including parts other than the capacitors mentioned above to see if anything is not soldered correctly.

Check bias voltages on the transistors to verify that they are powered and biased correctly. If an oscillation exists at the output and is close to the nominal center frequency (within 100 kHz) but cannot be tuned to the +/- 3 kHz window via CV501, check the value of the caps C536 and

C537.

Check that the trimmer CV501 is soldered correctly.

LOW RF OUTPUT POWER

If RF signal is present at the right frequency with low power, compare the RF power measurements with a known good board at various points moving from the antenna backwards towards the VCO. Look for signal discontinuities in the path (sudden large drop in measured power by more than a few dB).

Check the board visually for missing/skewed parts. Try to confine the problem to a specific circuit segment, and then check solder connections and part values or DC voltages for error. If the power out of the VCO is very low, check the bias voltages on the transistors and the values of

L502, C551, C543, C530.

EXCESSIVE CURRENT DRAIN

Try isolating different sections of the transmitter, such as the RF, Audio, and Digital circuits.

Look for reversed polarity capacitors, wrong resistor values, poorly soldered components, and shorted traces.

28

25A1090 (Rev.3)

DEVIATION PROBLEMS

If TR200 can't be adjusted to obtain proper deviation, try to isolate the problem to the Audio or RF section. To check the RF section, set the transmitter frequency to the frequency listed in

Table 1.2 in Section IV and verify that the tuning voltage of the VCO is correct. To check the audio section, apply -10dBu at 1kHz to TPA0. Set the gain to "0 dB". Check for audio with a scope at

TPA1. The level should be approximately 0dBu. Next, check the audio level at TPA2 for -0.8dBu.

Finally, check the level at pin 14 of IC150-4. If the level is correct, check the values of R504,

R510, R511, and C513-C5126 in the VCO area. If there is no audio, or the level is wrong, the problem is in the audio section. Trace backwards through the audio stages until you find the problem.

MICROCONTROLLER TROUBLESHOOTING

This paragraph describes what digital signals need to be seen to have audio running through a SLX system. The first thing that needs to be checked is, if the microcontroller is running its software.

If you see numbers or only fragments of numbers on the display after the unit has powered up, the microcontroller is running fine. Fragments of numbers in the display point to an open LCD driver pin or an intermittent LCD panel connection.

To test the microcontroller for normal operation, please test the following pins and conditions.

Microcontroller Pin Number

1 to gnd

4 to gnd

Across 10 and 9

Across 20 and 21

Across 28 and 29

31 to gnd

Net Name

~RST

~IRQ

VDD and VSS

VDDAD and

VSSAD

VDDA and

VSSA

OSC2

Condition

3.3V

3.3V

3.3V

3.1V

3.3V

Square Wave f0=32768Hz

The turn on procedure of the SLX transmitters includes several stages:

T = 0.000s: The power is turned on (soft switch). 5V and 3.3V are established approximately at the same time.

T = 0.480s: 32.768KHz crystal oscillates in a stable manner (~300ms) and internal reset cycle (~180ms) is over. From now software gets executed.

T = 0.???s: Microcontroller pin 5 (RF_VCC_OFF) goes from 5V to 0V. Synthesizer is powered on.

T = 0.???s: PLL data gets sent. You should see a signal similar to the graphic on an oscilloscope.

25A1090 (Rev.3)

29

(1) = PLL_LE @ pin 34, (2) = PLL_DATA @ pin 35, (3) = PLL_CLOCK @ pin 36

T = 1.800s: Microcontroller pin 6 (RF_GND_ON) goes from 0V to 5V. RF carrier gets unmuted.

T = 2.000s: Tone-key is turned on. You will see a square wave (Vpp = 5V, f0=32768Hz) at microcontroller pin 18 (TONEKEY_SQUARE).If these stages can be captured with the scope, the microcontroller did its part to let audio go through the system. If audio is still not being transmitted, please involve RF spectrum analyzer and oscilloscope to debug the RF and audio stage of the transmitter.

25A1090 (Rev.3)

30

REPLACEMENT PARTS

PRODUCT CHANGES

PARTS DESIGNATIONS

The following comments apply to the parts list and the schematics:

Resistors: Unless otherwise noted, all resistors are surface-mount with 1/10 W rating and 1% toler-

ance.

Capacitors: Unless otherwise noted, non-polarized capacitors are surface-mount NPO dielectric types

with a 100 V capacity and a 5% tolerance, and polarized capacitors are tantalum types.

COUNTRY

CODE

Q4

R5

S6

JB

H5

J3

L4

P4

SLX2 MODEL VARIATION

FREQUENCY

RANGE

COUNTRY

DESIGNATION

554-590 MHz

572-596 MHz

638-662 MHz

702-726 MHz

740-752 MHz

800-820 MHz

838-865 MHz

806-810 MHz

U.S.A. and CANADA

U.S.A. and CANADA

U.S.A. and CANADA

EUROPE / CHINA

KOREA

EUROPE

GREAT BRITAIN

JAPAN

SLX2

RF-AUDIO

PC BOARD NUMBER

200H510304

200J310304

200L410304

200P410304

200Q410304

200R510304

200S610304

200JB10304

25A1090 (Rev.3)

Reference

Designation

A1

A2

A3

A4

MP1

MP2

MP3

MP4

MP5

SLX2 HARDWARE REPLACEMENT PARTS

Description

IR Assembly

IR Detector 40kHz

3 Pin Male Connector Strip

Handle Assembly

Aluminum ID Ring

IR Bezel

Battery Cover Assembly

Foam Pad

Battery Holder Assembly

Headboard PCB

Copper Contacts

3 Pin Interconnect Strip

Retaining Ring

Internal Frame

Shure

Part Number

190A10302

188A617

170A76

95A9047B

53A8594

65A8474

95A9068

36A814

95B9048

190-057-03-34

53F2039A

56E8074

30A1314

65B8467

31

25A1090 (Rev.3)

MP6

MP7

MP8

MP9

MP10

MP11

MP12

MP13

MP14

MP15

MP16

MP17

Bezel

Pushbutton Switch Actuator (Power/Mute/Select)

Battery Cup

Frequency Nameplate

PCB Screw

Battery Nest Screws

RF Shield Cover

LCD Holder/Backlight

LCD Bezel

LCD

LCD Zebra Connector

Compression Pad (For Positive Battery Contact)

65A8475B

66A8070

65BA8451

39__8466

Provide

Frequency Code

In The Space

30J1245B

30D443E

53A8590A

65A8452

53A8573B

95A8991

80A8257

38D189

SLX2 REPLACEMENT PARTS (TOP)

Reference

Designation

Description

C100

C162

Capacitor, Tantalum, SMD1206, 15uF, 10V, 10%

Capacitor, Tantalum, SMD1411, 10uF, 16V, 10%

C531 Capacitor, Tantalum, SMD1206, 0.1uF, 35V, 10%

C432, 548, 549 Capacitor, Tantalum, SMD1411, 100uF, 6V, 10%

DS375

DS420

E408, 500

IC1

Chippled Green LED

Bicolor (Red/Green) LED

Bead, Ferrite, SMD 805, 600 OHM

L.C.D. Backlight Holder

IC100

IC370

IC350

IC430

Q185

Q410

SW324, 325

Y331

28 Pin QSOP Compander (THAT4320)

1K Microwire EEPROM (93AA46AT-I/OT)

Segment-Type, LED Driver

3.3V CMOS LDO Regulator (SP6213EC5)

Low Noise Transistor (MMBT5089L)

Transistor, Power, Mosfet (NSD355AN)

Switch, Pushbutton, Momentary, SPST

Crystal, Quartz, SMD, 32.768 kHz

Shure

Part Number

151AC156KA

151AD106KB

151AG104KA

151AB107KB

184A77

184A39

162A12

65A8452

188A568

188A577

188A506

188A590

183A38

183A74

155A21

40A8010

Reference

Designation

CON100

CON301

CON600

CON601

CON640

CV500

CV501

D162, 190

D400, 480

D500

D600

E100

IC150

IC400

IC501

SLX2 REPLACEMENT PARTS (BOTTOM)

Description

3 Pin Socket Strip (Female) For headboard

3 Pin Socket Strip (Female) For IF cable

Positive Battery Contact

Negative Battery Contact

Connector, COAX w/Switch (ONLY JB models)

Trim Cap., SMD, 0.65 - 2.5pF

Trim Cap., SMD, 3.0 - 15pF

Switching Dual Diode, SMD (MMBD2836L)

Common Anode Schottky Diode (BAT 54A)

Variable Capacitance Diode

Dual Schottky Diode (BAT 54S)

Bead, Ferrite, SMD 805, 600 OHM

Quad Op. Amp., SO-14 (MC33179)

Sync Boost Converter (LTC3400ES6)

Low Power Dual Synthesizer (LMX2335LTM)

Shure

Part Number

170C15

95A9054

53A8591

95A9064

170A36

152A04

152E05

184A07

184B69

184A72

184A69

162A12

188A49

188A479

188B388

32

L404

L501, 503

L600, 601

L611

Q205

Q475

Q501, 502

Q600

Inductor, SMD 2518, 4.7nH

Inductor, SMD 603, 100nH



Transistor, TMOS, SOT-23 (2N7002L)

Transistor, Power, Mosfet (NSD355AN)

Transistor, High Frequency (2SC5006)

Transistor, SOT-23 (AT-41533)

162A64

162A25

162AE56

162N25

183A30

183A74

183A66

183A49

Q601

Q630

SW100

TR160, 200

TR640

Y500

Transistor, Bipolar, Silicon (AT-41486)

Transistor, PNP, SOT-23 (MMBT2907L)

Q375, 480, 631 Transistor, Low Noise, SOT-23 (MMBT5089L)

SW324, 325 Switch, Pushbutton, Momentary, SPST

183A44

183A27

183A38

155A21

Switch, Slide, 2-Position 155A32

Trim-pot., Line, 100K

Ω 146E10

Trim-pot., Line, 470

Ω

146A10

Crystal, Quartz, SMD, 16MHz 140A26

Frequency

Code

C506

C522

C523

C525

C528

C534

C543

C551

C603

C611

C612

C615

C616

C617

C618

C619

C651

C97

E301

E302

E303

MICROCONTROLLER (IC300) SELECTION

Shure Part Number Country

Code

Q4

R5

S6

JB

H5

J3

L4

P4

188A585A

188B585A

188C585A

188D598A

188E585B

188F585A

188G585A

188H585B

H5

FREQUENCY DEPENDENT PARTS**

J3 L4 P4 Q4 R5

120pF

3.9pF

10pF

2.7pF

10pF

6.8pF

12pF

120pF

8.2pF

DNP

600

Ω

600

Ω

600

Ω

150pF

6.8pF

3.3pF

3.9pF

3.3pF

3.9pF

12pF

8.2pF

68pF

2.7pF

6.8pF

2.2pF

12pF

8.2pF

10pF

68pF

68pF

5.6pF

3.9pF

3.9pF

1.5pF

3.9pF

10pF

5.6pF

6.8pF

DNP

DNP

DNP

DNP

68pF

2.7pF

6.8pF

2.2pF

12pF

8.2pF

5.6pF

68pF

68pF

4.7pF

2.7pF

2.2pF

2.2pF

2.7pF

4.7pF

4.7pF

4.7pF

DNP

DNP

DNP

DNP

68pF

2.2pF

6.8pF

2.2pF

12pF

8.2pF

3.9pF

68pF

68pF

3.9pF

2.2pF

2.2pF

1.0pF

2.7pF

4.7pF

4.7pF

2.2pF

DNP

DNP

DNP

DNP

68pF

3.9pF

10pF

2.2pF

12pF

8.2pF

6.8pF

68pF

68pF

3.9pF

3.9pF

1.8pF

2.7pF

2.2pF

6.8pF

5.6pF

5.6pF

DNP

DNP

DNP

DNP

68pF

3.9pF

10pF

2.2pF

12pF

8.2pF

6.8pF

68pF

68pF

3.3pF

2.2pF

1.8pF

1.5pF

2.2pF

6.8pF

5.6pF

5.6pF

DNP

DNP

DNP

DNP

S6

68pF

3.3pF

5.6pF

3.3pF

10pF

8.2pF

4.7pF

68pF

68pF

3.3pF

2.2pF

1.8pF

1.0pF

2.2pF

6.8pF

5.6pF

5.6pF

DNP

DNP

DNP

DNP

25A1090 (Rev.3)

33

JB

68pF

3.9pF

10pF

2.2pF

12pF

8.2pF

6.8pF

68pF

68pF

3.3pF

2.2pF

1.8pF

1.5pF

2.2pF

6.8pF

5.6pF

5.6pF

DNP

DNP

DNP

DNP

R606

R607

R612

R613

R614

R640

R650

R651

R1

R2

R201

R3

R320

R4

R5

R6

R652

R653

R7

R8

L602

L603

L604

L605

L606

L607

L640

L641

E603

L301

L302

L303

L400

L401

L502

L505

22nH

DNP

18nH

15nH

15nH

15nH

DNP

6.8nH

600

Ω

DNP

DNP

DNP

470nH

470nH

15nH

5.4nH

1K

DNP

121K

DNP

1K

DNP

DNP

DNP

22.1

Ω

DNP

499

Ω

10

Ω

499

Ω

DNP

499

Ω

10

Ω

499

Ω

22.1

Ω

DNP

DNP

22nH

DNP

18nH

12nH

12nH

8.2nH

DNP

8.2nH

600

Ω

220nH

220nH

220nH

470nH

470nH

15nH

5.4nH

DNP

1K

150K

DNP

3.01K

DNP

DNP

DNP

22.1

Ω

DNP

499

Ω

10

Ω

499

Ω

DNP

499

Ω

10

Ω

499

Ω

22.1

Ω

DNP

DNP

8.2nH

180nH

8.2nH

6.8nH

6.8nH

8.2nH

DNP

12nH

DNP

180nH

180nH

180nH

220nH

220nH

6.8nH

2.55nH

DNP

DNP

121K

DNP

30.1K

DNP

1K

DNP

22.1

Ω

DNP

221

Ω

22.1

Ω

221

Ω

DNP

221

Ω

22.1

Ω

221

Ω

22.1

Ω

DNP

DNP

15nH

DNP

12nH

8.2nH

8.2nH

DNP

DNP

1.2nH

600

Ω

220nH

220nH

220nH

470nH

470nH

12nH

3.85nH

DNP

DNP

121K

DNP

18.2K

1K

DNP

DNP

22.1

Ω

0

Ω

499

Ω

10

Ω

499

Ω

DNP

499

Ω

10

Ω

499

Ω

22.1

Ω

DNP

DNP

18nH

DNP

12nH

8.2nH

8.2nH

12nH

DNP

10nH

600

Ω

220nH

220nH

220nH

470nH

470nH

15nH

3.85nH

DNP

DNP

121K

1K

4.99K

DNP

DNP

DNP

22.1

Ω

DNP

499

Ω

10

Ω

499

Ω

DNP

499

Ω

10

Ω

499

Ω

22.1

Ω

DNP

DNP

8.2nH

180nH

10nH

6.8nH

6.8nH

12nH

DNP

12nH

DNP

180nH

180nH

180nH

220nH

220nH

6.8nH

2.55nH

DNP

DNP

150K

DNP

12.1K

DNP

DNP

DNP

22.1

Ω

DNP

DNP

10

Ω

DNP

DNP

221

Ω

22.1

Ω

221

Ω

10

Ω

1K

DNP

8.2nH

180nH

8.2nH

6.8nH

6.8nH

8.2nH

DNP

12nH

DNP

180nH

180nH

180nH

220nH

220nH

6.8nH

2.55nH

DNP

DNP

121K

DNP

7.5K

DNP

DNP

1K

22.1

Ω

DNP

DNP

0

Ω

DNP

DNP

499

Ω

18.2

Ω

499

Ω

10

Ω

DNP

DNP

8.2nH

180nH

8.2nH

6.8nH

6.8nH

8.2nH

12nH

DNP

DNP

180nH

180nH

180nH

220nH

220nH

6.8nH

2.55nH

DNP

DNP

150K

DNP

7.5K

DNP

DNP

DNP

49.9

Ω

DNP

221

Ω

22.1

Ω

221

Ω

33.2

Ω

221

Ω

22.1

Ω

221

Ω

22.1

Ω

DNP

1K

25A1090 (Rev.3)

34

SLX2 PRINTED CIRCUIT BOARD ASSEMBLY - SLX2

TOP VIEW

25A1090 (Rev.3)

BOTTOM VIEW

35

Shure SLX 2 Wireless Transmitter Service Manual

Assistant Bot

SLX2 Wireless Transmitter Service Manual

25A1090

SLX2 WIRELESS HANDHELD TRANSMITTER

PRODUCT DESCRIPTION

FEATURES

DETAILED DESCRIPTION

Features

Adjusting Gain

SLX2 Transmitter Programming

frared synchronization.

AUDIO/RF BLOCK DIAGRAM

CIRCUIT DESCRIPTION

AUDIO CIRCUIT DESCRIPTION

AUDIO SECTION

POWER SECTION

LOW BATTERY SHUT DOWN:

RF CIRCUIT DESCRIPTION

RF SECTION

DIGITAL CIRCUIT DIAGRAM

DIGITAL SECTION

ACCESSING DIFFERENT MODES

Test Frequencies (MHz)

SLX2

H5

J3

Frequency

Low

Center

High

JB

L4

TP_PA0 TP_PA1

P4

Q4

R5

S6

SLX Reference Designators

SLX2

R

R319

R

R320

Note: Voltages are calculated with a 3.30V (+/- 0.10V) reference from the power

µC DECISIONS BASED ON ANALOG VOLTAGES

BATTERY_A2D

Measured @ 3V block battery clips

Continuous Operation Battery Thresholds

RF Level

Display Logic

Voltage (V)

NOTES

FUNCTIONAL TEST

REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):

LISTENING TEST

FUNCTIONAL TEST

ASSEMBLY AND DISASSEMBLY

!CAUTION!

Observe precautions when handling this static-sensitive device.

EXPLODED VIEW

SERVICE PROCEDURES

MEASUREMENT REFERENCE

dB Conversion Chart

REQUIRED TEST EQUIPMENT (OR APPROVED EQUIVALENT OR SUPERIOR MODELS):

Spectrum analyzer or power meter

Digital multimeter

Audio Analyzer

RF Signal Generator

Frequency Counter

Receiver

50 ohm, RG-174 BNC to open (stripped) coaxial cable or "rocket launcher" tip (P/N

95A8278). For JB, Murata cable #

Audio Test Head

BNC (Male) to BNC (Male) Cable (2)

DC Blocker

XLR (Female) to Banana Plug Adapter

20 dB Attenuator

Toray non-inductive tuning tool - BLUE

Toray non-inductive tuning tool - PINK