Realistic DX 300 communications receiver Service Manual

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Catalog Number: 20-204
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LUSTOM MANUFACTURED FOR RADIO SHACK 1X A DIVISION OF TANDY CORPORATION
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CONTROLS AND THEIR FUNCTIONS
(For complete details on operation, refer to the Owner's Manual.)
SIGNAL STRENGTH &
Battery Meter
Shows relative strength of re
caved signal (or Battery comi
tion when BATT TEST is usec).
| 000
PRESELECTOR TUNE & Dial
Set to approximate frequency
YOU want to tune 19.
| $58 signals).
| СТАЕ тов 1
Crem of ww Em
|
Use to fine tune signals (especially
Digital Frequency Readout
Show the precise frequency the
Receiver is tuned to {in MHz and
kHz).
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RET Y
PRESELECTOR SAND Switch
Sel to appropriate band when
adjusting PRESELECTOR TUNE,
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ATTENuator Switch
Use to attenuate strong locai sig
nais (Does not function when
using a long-wire antenna.)
Speaker
Receive sound comes from here
{unless headphones are con-
nected).
DD Jack
Connect headphones for private
listening or for listening in high
background noise locations.
o ETAPAS a
Mode Switeh
Determines mode of operation.
VOLUME/OFF Controi
LIGHT Switch
When using battery power, use to
check battery condition {BATT
TEST} or tum dial lights an (ON).
With AC power, lights are always
on.
Use ta turn Receiver “on” and
adjust volume of sound,
RF GAIN Control
AUDIO Switch
Set for least interference and best
sound,
Cord Wrapping Posts
Use to wrap the AC Power Cord
for storage or when operating
from Battery power or external
12 VDC. (Screw posts into back
of Cabinet.)
Use to adjust sensitivity of
Receiver. >
Main Tuning
Adjust cuter knob to desired MHz
range.
Adjust inner knob for precise EH
tuning
Coax ANTenna Connector
1
Cord Wrapping
Connect 50 — 7582 antenna lead-
IN ta this,
ANTenna Screw Terminal
Rubber Fest are provided in case you
Plastic Posts
use the Heceiver in portable operation.
Peel off af paper backing and press
onto Left hand side of Cabinet,
Connect long wire .antennas to
this screw terminal.
Battery Compartment
To operate from battery power,
load 8 heavy-duty “C” Barteries
here.
External Speaker Jack
Connect an extemal speaker to
this jack (automatically discon-
nects built-in speaker).
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- 8. AT
KEY Jack
To practice Morse Code, plug a
code key into this jack, tune
Receiver to 1 or 2 MHz and set
Mode to USB/CW or LSB/CW.
0 TAPE QUT Jack
Connect a tape recorder to this
jack and record messages off-the-
air.
GrouND Screw Terminal
Connect a wire between one of
these screws and a good ground
point. The ather is for MUTE
operation,
MUTE Screw Terminal
Can be used for remote muting
of the Receiver (without using
STANDBY Mode switch posi-
tion}. To Mute, connect to a GND
screw.
Le |
Power Cord
Connect to a source of 120 Volts, |
50 Hz AC power.
FUSE
Protects the unit from abnormally
high current. Use only a 0.5 Amp
Type.
DC 12V Jack
For operation from an external!
source of 12 voits DC, connect
red wire ra + ant hiack wiro tn —
SPECIFICATIONS
Description Condition Nominal Spec. Limit Spec.
Frequency Coverage Band A 10 — 150 kHz 10 — 150 kHz
Band B 150 — 500 kHz 150 — 500 kHz
Band C 500 — 1600 kHz 500 — 1600 kHz
Band D 1.6 == 45 MHz 16 -- 45 MHz
Band E 45 ~ 12 MHz 45 ~ 12 MHz
Band F 12— 30MHz 12 — 30 MHz
Sensitivity 50 kHz AM 30uV SSB 30 uV Not specified
(5+N)/N = 10 dB 150 kHz 5 uV 5 uv AM 50 uv SSB 50 uv
AF Qutput = 50 mW 300 kHz T uv 0.5 uv 10V 5 uV
900 kHz 0.5 uv 03 pv TO UV Suv
3.1 MHz 0.5 uV 0.3 pv Z uv 1 uv
7.1 MHz 0.5 pV 0.3 uV 2 uN 1uV
15.1 MHz 0.5 uV 0.3 uv 2 и\ 1 uv
28.1 MHz 0.5 uv 0.3 uv 2 uv 1 uv
Loop Antenna 180 kHz 11 mV 50 mV
Sensitivity 300 kHz 4 mV 15 mV
(S+N)/N = 20 dB 470 kHz 2 mV 8 mv
600 kHz 1 mv 2 mv
900 kHz 550 uV 1.5mV
1.4 MHz 450 uv imV
Image Ratio 10 — 50 kHz Not specified Not specified
100 kHz 70dB 50dB
300 kHz 70 dB 50 dB
900 kHz 0 dB ' 50 cB
3.1 MHz 60 dB 50 dB
7.1 MHz 60 dB 50 dB
15.1 MHz 60 dB 50 dB
28.1 MHz 60 dB 50 dB
Intermediate Frequency 1st 54.5 55.5 MHz
2nd 3i— 2 MHz
3rd 455 kHz
Spurious Rejection between 2 MHz and 150 MHz 60 dB 30 dB
at 7.1 MHz
Birdies at 7.0 MHz (S+N)/N = 10 dB 2.0uV 10uYV
Input Attenuator 0 dB
20dB 22 dB 16 - 28 dB
40 dB 40 dB 34 — 46 dB
Selectivit +10 kHz 94 dB 60 dB
HECHT ~6 dB 5.5 kHz 3.5 — 7,5 kHz
Audio Output 802, 10% T.H.D. 1.5W 1.2 W
Phone Jack Output 8, 0.5 W AF Output 100 mV 50 - 200 mV
7,1 MHz 1 mV (1 kHz 30%
> — A V
Tape Output MOD), 0.5 W AF Output 300 mV 150 — 600 т
7.1 MHz 1 mY (1 kHz 30% Lo
-to- 5
Signal-to-Noise Ratio MOD), 0.5 W AF Output 40 dB 35 dB
Hum & Noise at 842 Speaker Output AM/SSB 2 mV AM/SSB 5mV
(VOLUME : Minimum)
at 8{2 Phone Jack Output
AM/SSB 0.25 mV
AM/SSE 0.5 mV
Description Condition Nominal Spec. Limit Spec.
Meter Sensitivity S-8at 7.1 MHz 30 UV 15 = 100 uv
Audio Response NORMAL 300 Hz -5 de —5 + 6 dB
0 dB NORMAL 1 kHz 3 kHz —14 dB Not specified
WIDE 1 kHz +3 dB +3 +IdB
300 Hz +0.5 dB +0.5 + 6 dB
3 kHz —/ dB Not specified
NARROW 1 kHz — 1 dB —1]1+3dB
300 Hz 0dB 0+6dB
3 kHz —18 dB Not specified
Frequency Display
Frequency Stability
Antenna Impedance
Qperation Temperature
Power source
5-digit LED display (MHz/kHz)
Within +1 kHz after one hour warm up
5082 unbalanced type (50239 type connector)
High impedance type (screw type terminal)
0°C to 43.3°C
AC 120 Y, 60 Hz for USA 8: CANADIAN models or AC 230 V, 50 Hz for
EUROPEAN & AUSTRALIAN models,
DC 12 V (negative ground only) or internal 8 PCS “C”' cells
NOTE: Nominal Specs represent the design specs; all units should be able to approximate these — some will exceed and
some may drop slightly below these specs. Limit Specs represent the absolute worst condition which still might
be considered acceptable; in no case should a unit perform to less than within any Limit Spec.
- PRINCIPLES OF OPERATION
zu
This Receiver is a triple-conversion type and employs a “double tuning’ system. MHz Tuning tunes to the MHz “unir” of ¢
+Ha recailviasn trealiency hs ealarir shim darian 3
LE. 0 = ото …. —— o — = =
(LÉ, SO ECS the Cesired 1 MHZ portion 10 БЕ (ити) and kHz Tuning tunes ro me kHz “unmirts)”
Retgg to the Block Diagram as you read through the following description:
An RF signal picked up by the Antenna goes to AF section via ATTenuator and Preselector. The RE signal 1s amplified by
Q201, and up-mixed in 1st Mixer 0202 and 0203 with 1st Local Oscillator 0401 (MHz Tuning). 0401 produces 55.5 MHz
to 84.5 MHz signals in 1 MHz spreads as required for the MHz portion of the receiving frequency (1.e. 55.5 MHz for “0” MHz
spread... from 10 kHz to 999 kHz, 56.5 MHz for 1 MHz to 1.999 MHz... etc. ...]. The resulting frequency will always be from
55.5 MHz to 54.5 MHz. Note the frequency inversion as well as the up-conversion. This signal is amplified by Ist IF Amp
Q205 and Q214.
The Reference Oscillator generates a 4 MHz crystal-controlled frequency using Q507. This is divided down to 1 MHz by
C502. D501 and D502 are used for the harmonics generator and produce integer harmonics of 1 MHz, which then are mixed
in 10201 with 1st Local Oscillator frequency (55.5 MHz to 84.5 MHz). Of the harmonics mixed with the 1st Local Oscillator
signal, only the 52.5 MHz signal is amplified by Q207 -— Q209, and fed into 0206. In other words, only those harmonics that
will produce 52.5 MHz when mixed with ist Local Oscillator are applied to the 2nd Mixer. For example, to receive a 4 MHz
signal, the 1st Local Osciilator frequency must be 59.5 MHz, so the 7th harmonic from the Harmonics Generator (i.e. 7 MHz)
is used to produce required 52.5 MHz.
This 52.5 MHz frequency is down-mixed with ist IE (65.5 — 54.5 MHz) and produces a 2 — 2 MHz 2nd IF (again note that
the signal is “reversed” -— Le, 3 to 2, not 2 to 3 MHz). The 3rd Local Osciilator produces a signal 455 kHz higher than the 2nd
IF, and is down-mixed with the 2nd IF at Q302, and a 3rd IF of 455 kHz is produced.
Note that the 556.5 — 84.5 MHz Local Oscillator is used both for ist and 2nd mixing. This cancels frequency drift. For
example, if the 1st heterodyning frequency drifts 7 kHz. The 2nd heterodyning frequency also drifts 1 kHz, thus the drift
is cancelled. (
For instance:
When tuned to CB Channel 1, 26.965 MHz, and if the Local Qscillator is running at 81.6 MHz (but it should be 81.5 MHz)
this is what happens.
Actual Shouid be
Tst Mix, 81.6 — 26.965 = 54.635 MHz 81,5 — 26.965 = 54 535 MHz
2nd Osc. 29 MHz 29 MHz
3rd Mix. 81.6 — 29 = 52.6 MHz 81.5 — 29 = 52.5 MHz
2nd Mix. 54.635 — 52.6 = 2.035 MHz 54.535 — 52.5 = 2.035 MHz
Thus, drift is cancelled.
Frequency Readout:
Just as with Tuning, frequency readout is done in two stages: MHz and kHz.
The MHz indicator is mechanical: MHz tuning capacitor VCS is mechanically ganged with SW7.
SW7 makes the switch wafer to readout 0 — 29: it will indicate “0” when 1st Osc. is set ta 55.5 MHz, “1” for 56.5 MHz,
etc. ..
For kHz readout, IC501 counts the 3rd Local Oscillator frequency, which is, as described above, the kHz Tuning. The 3rd
Osc. signal is buffered and amplified by Q307, 0308 and Q506, and applied to IC501. IC501 then converts this signal and
drives the kHz display.
BLOCK DIAGRAM
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OPERATION CHECK/ALIGNMENT PREPARATION
Test instruments required.
Cscilioscope
AC VTVM (RF)
DC VTVM
Spectrum Analyzer (if available) or Monitor Scope (40 MHz — 60 MHz)
Frequency Counter
832 Durnmy Load
RF Signal Generator (10 kHz — 30 MHz)
Audio Signal Generator
Distortion Meter
Sweep Signal Generator (40 MHz — 60 MHz)
Detector
S00R NDC EWN
rly —
NOTE: Prior to alignment allow instruments and unit to warm up for 15 minutes. Maintain Generator output level at
minimum necessary (to avoid saturation and clipping}.
ALIGNMENT LOCATIONS AND POINTS
RF P.C.B. — 1F/AFP.C.B.
TP203 8 e TP202 à TP206
L219
L206 L204 L217 L216 L275
L218
тсзоз L305
vR201 L214 О Q302
L205 70 (S L303 52 D
213 O G1 o $ VR301
TP302 C
&
L212
TP201 @
ТР205 ®
TC201 TC202 TC203 121
Le _e
® B © pan os
= {A С)
1209 L210 1304 Xe
1201 T204 T205 T206 = Side e
T302 7301 .
1202/T203 are bar antenna coil. О О 1303
O
MHz P.C.B.
(Soldering Side View)
1 23 ; .
CLO EL TP401 NOTE: T2071 and T303 happen to be adjustable due to
ee 1401 parts procurement ease. No need to adjust them.
| t
pa VR302 is attached to lug terminal on bottom side
—e TC401
> of IF/AF PCB.
© TC402
AF OPERATION CHECK
( START )
Y
| CONNECTION |
-
Connect AF Generator to “hot” end of VOLUME Control.
Connect AC VivmM, Oscitloscnpe and Distortion Meter to EXT SPKR Jack
J3 across 892 Dummv Load.
See Figure 1. во
DUMMY LOAD
AF SIGNAL SET |
GENERATOR UNDER TEST > OSCILLOSCOPE
43
EXT SPKR
> AC VTVM
DISTORTION
METER
a Figure 1
Control setting: VOLUME (max), AUDIO (NORMAL), Mode (AM)
AF Generator setting: 1 kHz
Check AF Output with 10 - 20 mV input.
AF Output Power should be 0.5 W with 10 — 20 mV input.
Check AF circuit. See Troubleshooting 3).
AF Output Power is not 0.5 W with 10 — 20 mV input and/or Distortion is
over 10%.
AF Output Power is 0.5 W with 10 — 20 mV input and Distortion is less
than 10%.
2ND/3RD IF OPERATION CHECK
(START )
|
]
| CONNECTION |
(STEP 1
STEP 2
1
Ÿ
| REFERENCE |
|
Connect SG to TP 202 through a 2pF capacitor. Lo
Connect AC VTVM and Oscillator to EXT SPKR Jack J3 across as Dummy
Load. See Figure 2.
80
DUMMY LOAD
“a SET
SIGNAL 5 1} o . ле
GENERATOR + UNDER TEST —+ —-JOSCILLOSCOPE
TP202 13
EXT SPKH
AC VTVM
Figure 2
Control setting : Mode (AM), VOLUME (max), RF GAIN (max)
AUDIO (NORMAL)
Signal Generator : 2.5 MHz (1 kHz, 30% Mod.) uo
MHz/kHz Tuning —: 10.500 MHz
Check AF Output level with 700 — 1409 uV input. a
AF Output level should be 3 V with 700 — 1400 uV input. =”
Check 2nd IF Stage, 3rd IF Stage, DET circuit and/or associated circuit
components.
AF Output levei is not 3 V with 700 — 1400 uV input. —
AF Output level is 3 V with 700 — 1400 uV input.
TOTAL GAIN CHECK
| CONNECTION |
Pa
a
3
|
STEP 2
[REFERENCE |
4
¥
(ster a)
|
[REFERENCE]
~——— REPAIR]
|
y
a
STEPS
1 An E AA, E dram N cm Be ‚== - e —— = e ak
Connect SG to ANT Jack À — 1 and DC VTVM to TP 301.
See Figure 3.
RF Act a. TP301
SIGNAL € SET UNDER DC VTVM
GEN. J
Z = 50 oh
om Figure 3
Control Setting — : RF GAIN (max.)
PRESELECTOR BAND (0.01 — 0.15)
MHz/kHz Tuning (100 kHz)
SG Setting : 100 kHz
Increase SG output until 1.5 V readina is obtained on DC
VTVM.
SG output is 7.5 — 20 uV
Check RF and/or IF Stage and/or associated compeaneris,
SG output is more than 30 uV В 3
SG output is 7.5 -— 30 uV
Control Setting :PRESELECTOR BAND (0.15 — 0.5)
MHz/kHz Tuning (300 kHz)
SG Setting : 300 kHz
Increase SG output until 1.5 V reading is obtained on DC
VTVM.
SG output is 0.75 — 3 uV
Check RF Stage and/or associated circuit components.
SG output is mare than 3 uV
SG output is 0.75 — 3 uV
Control Setting : PRESELECTOR BAND (0.5 — 1.6) |
MHz/kHz Tuning (900 kHz) 0
SG output : 900 kHz
Increase SG output until 1.5 V reading is obtained on DC
VTVM.
— 10 —
|
1
( STEP 10)
[REFERENCE]
STEP 12
REFERENCE
| REPAIR |
Check RF Stage and/or associated circuit component.
SG output is more than 2 uV
SG output is 0.5 — 2uV
Control Setting : PRESELECTOR BAND (1.6 — 4.5)
MHz/kHz Tuning (3.1 MHz)
SG Setting : 3.1 MHz
Increase SG output until 1.5 V reading is obtained on DC
VTVM.
SG output is 15 - 6uV
Check RF Stage and/or associated circuit components.
SG output is more than 6 uV
SG output is 1.5 — 6uV
Control Setting : PRESELECTOR BAND (4.5 — 12)
MHz/kHz Tuning (7.1 MHz)
SG Setting — : 7.1 MHz
Increase SG output until 1 V reading is obtained on DC VTVM.
SG output is 0.75 — 3 uV
Check RF Stage and/or associated circuit component.
SG output is more than 3 uV
SG output is 0.75 — 3 uV
Control Setting: PRESELECTOR BAND (12 - 30)
MHz/kHz Tuning (21.1 MHz)
SG Setting : 21.1 MHz
Increase SG output until 1 V reading is obtained on DC VTVM.
SG output is 1.5 — 6 uV
Check RF Stage and/or associated circuit component,
SG output is less than 6 pV
SG output is t.5 — 6 uV
1ST IF OPERATION CHECK
| START ;
1
| CONNECTION |
i
( STEP 1
Connect 5G to TP201 and DC VTVM to TP202. See Figure 4,
ТР201 a
Y
SIGNAL 8 o SET
GENERATOR |-+ e UNDER TESY DC VTVM
y
Hot side of L209 ;
{for 2ND LOCAL FREQ. AMP OPERATION CHECK {Page 13] }
Figure 4
NOTE
1. Connect Pin-2 of TP401 to Pin-3 of TP401 in order to inhibit the 1st
Local Osciliator.
2. Supply GND level to the point where C240 and a coaxial cable is jointed
in order to inhibit the output af Harmonics Generator (D501, D502)
Control Setting : Mode (АМ)
PRESELECTOR BAND (4.5 - 12 MHz)
PRESELECTOR TUNE (10 MHz}
| MHz/kHz Tuning (10,5 MHz)
Signal Generator
Setting : 55 MHz (No Mod.)
Increase SG output until 100 mV (250 mV) reading is obtained on DC VTVM.
SG output is 2.14 — 4.22 mV (21.4 — 42.2 mV).
Check 1st IF stage and/or associated circuit components,
SG output is not 2.14 — 4.22 mV (21.4 — 42.2 mV).
SG output is 2.14 — 4.22 mV (21.4 — 42.2 mV).
1ST LOCAL OSC OPERATION CHECK
e ( START Y
X I 4 Р i tes
CONNECTION Connect Frequency Counter to TP401 through a Bagfer circuit;
See Figure 5.
TP401 NOTE:
SUETER CIRCUIT The leads 1, 2 and 3 must be
SET | | no longer than necessary.
UNDER TEST | 25K19 | |
НЕ oF FREQUENCY
1 YY
| 9 À 1 COUNTER
| 1kn = | 1
CTT. 1
Figqure5 |
f
| REPAIR] The following readings should be obtained on Frequency Counter in accord-
Ш ance with MHz Tuning.
MHz Readout Frequency Counter Readings
(MHz) (MHZ)
0 55.5 + 0.1
1 | 56.5 + 0.1
2 . 57.6 + 0.1
28 83.5 + 0.1
0 29 84.5 + 0.1
f See 1ST LOCAL OSC ALIGNMENT on page 19. ‘
> E | The reading does not meet the chart
The reading meet the chart.
2ND LOCAL FREQ. AMP OPERATION CHECK
(START)
1
| CONNECTION| Connect SG to “hot” side of 1.208 and DC VTVM to TP202.
See Figure 4.
STEP 1 Control Setting : Mode (AM)
PRESELECTOR BAND (4.5 — 12 MHz)
PRESELECTOR TUNE (10 MHz)
MHz/kHz Tuning (10.5 MH2z)
Signal Generator
| Setting : 52.5 MHz (No Mod.)
(sTEP 2) Increase SG output until 160 mV (350 mV) reading is obtained on DC VTVM.
[REFERENCE] SG output is 2.14 — 4.22 mV (21.4 — 42.2 mV).
O | Check Q207 — Q209 and/or associated circuit componen,
SG output is not 2.14 — 4.22 mV (21.4 — 42.2 mV).
SG output is 2.14 — 4,22 mV (21.4 — 42.2 mV).
PRESELECTOR DIAL CALIBRATION
„ант
wi
| CONTROL SETTING
CITE Me NU ТРЕ Е FEB ol mmm als beh ream E A EAT A
i
| CALIBRATION
eT mE EA AE A TA = == олень AE LE кожные вы это се
Set PRESELECTOR TUNE fully counter-ciockwise. |
Hold PRESELECTOR TUNE knob with your hand, and set the gear (1) , shown in
Figure 6, so that the Preselector Dial is as shown in Figure 7. |
Г
Figure 6
| OS 1.6 4.5 12
; | |
KL. y
| OC OC CO
NT J
PRESELECTOR TUNE
Figure 7
LINKAGE ADJUSTMENT OF MHz SWITCH
PRECAUTION: Do the mechanical adjustment only it is actually necessary after CHECK or you replaced some parts.
CONTROL SETTING
QFF/ VOLUME : ON
MHz Tune : fully clockwise
CHECK
ADJUSTMENT
Check the MHz Tuning indication; rotating the MHz Tuning in the counter-clockwise
direction causes the MHz Tuning display to vary in 29, 28,
eventually disappear.
неее... 1, 0, sequence and
Loosen screw on MHz Switch shaft. Turn the shaft of MHz Switch in the direc-
tion that results in a MHz sequence indication of OQ, 1, ....... 28, 29; tighten screw (1)
at the precise point where the 2% MHz indication disappears. To avoid miss tracking
be sure to make this shaft setting very precisely.
3RD IF ALIGNMENT
1
TEST SIGNAL |
STEP | INSTRUMENT CONTROL SETTINC SENERATCR | ADJUSTMENT REMARKS
CONNECTION SETTING
OFF/VOLUME: ON Adjust T301 and T302 for max.
Refer to Mode: AM 455 kHz reading (approx. —2.3 V) on DC
1 Fi о RF GAIN: Max. 1mV +3d8 T301, T302 VTVM.
gure MHz Tuning: 1 MHz (NO MOD.)
kHz Tuning: 500 kHz
455 kHz Adjust T3071 and T302 for max.
2 Same as Step 1 Same as Step 1 | 10mY +3dB | Same as Step 1 | reading (approx. —Z.5 V} on DC
(NO MOD.) | VTVM.
Q302 (Gate 1) TP301
|
50% 0.01uF
SIGNAL A IL SET
GENERATOR ' DC VTVM
— о UNDER TEST
Figure 9
ALIGNMENT OF kHz TRACKING
STEP CONTROL SETTING ADJUSTMENT REMARKS
OFF/VOLUME: ON
Mode: AM
MHz Tuning: 1 MHz |
1 Set FINE TUNE to minimum receiving frequency with TC303 roa for kHz Read-
FINE TUNE knob set to 9 o'clock position. Preset kHz outo
Tuning to fully counterclockwise and return it approxi-
mately 1-1/4 turns from the point when slipping starts.
OFF/VOLUME: ON
Mode: AM
5 MHz Tuning: 1 MHz L305 Adjust L305 for kHz Read-
Set FINE TUNE to 3 o'clock position, and set kHz Tuning
fully clockwise and return it approximately 1-1/4 turns
from the point when slipping starts.
out of 999”.
3 Repeat Steps 1 and 2 a couple of times.
2ND IF ALIGNMENT
| TEST SIGNAL |
STEP, INSTRUMENT CONTROL SETTING GENERATOR ı ADJUSTMENT ACIARÁS
CONNECTION = SETTING
OFF/VOLUME: ON 2.1 MHz Adjust L301 and L303 for max.
Mode: AM 1 mV (10 mV) reading (approx. 3 V (3.5 V}]
Refer to RF GAIN: Max. +3 dB on AC VTVM.
L301
Figure 10 VOLUME: Max. 1 kHz 01. 1.303
MHz Tuning: 2 MHz 30% Mod.
kHz Tuning: 900 kHz
OFF/VOLUME: ON 2.9 MHz Adjust TC301 and TC302 for
Mode: AM 1 mV (10 mV) max. reading (approx. 3 Y
RF GAIN: Max. +3 dB (3.5 М) ] оп АС УТУМ.
2 Same as Step 1 VOLUME: Max. 1 kHz TC301, TC302
MHz Tuning: 2 MHz 30% Mod.
kHz Tuning: 100 kHz
3 Repeat Steps 1 and 2 until no further improvement can be obtained.
TP 202 EXT SPKR J3
85
DUMMY LOAD
SIGNAL 502 oF SET :
A IL. ; 5
GENERATOR L_ $ 1, © UNDER TEST | msn АС УТУМ
N |
Figuse 10
NOTE:
Remember, 2nd IF is “reversed”; 3 to 2 MHz, not 2 to 3 MHz. Thus SG frequency should be 2.1 MHz for 2.9 MHz
reception and 2.9 MHz tor 2.1 MHz reception.
ALIGNMENT OF 2ND LOCAL FREQ. AMP
FREQUENCY (MHz)
Figu'e 12
Fiqure 13
| TEST SIGNAL
STEP | INSTRUMENT CONTROL SETTING GENERATOR | ADJUSTMENT REMARKS
CONNECTION SETTING
OFF/VOLUME :ON Center Frea. Set marker frequency to
Mode : AM 52.5 MHz 52.5 MHz.
PRESELECTOR BAND Adjust L212 ~ L217 to peak on
; Refer to : 4.5 — 12 MHz Sweep Width L212 ~ L217 monitor scope.
Figure 11 PRESELECTOR TUNE 52.5 + 2 MHz ;
: 10 MHz
MHz Tuning : 10 MHz
kHz Tuning : 500kHz |
Set marker frequency to
5725 MHz
Adjust L210 ~ L217 to obtain
2 Refer to Same as Step 1 Same as L210 ~ L217 the cl aracteristic curve as
Step 1 shown in Figure 12.
Figure 11 CL .
The core position af each coil
should be approximately as
Mustrated in Figure 13.
Hot side of L209 (Step 1) MONITOR SCOPE
liz (Step 2)
JAN
SWEEP A SET A
*DETECTOR © ©
GENERATOR | Y y UNDER TEST +1,‘ H | T
— MARKER
(for 1ST IF ALIGN- (SSG)
MENT on page 18)
« DETECTOR CIRCUIT
470P 1№60 4.7K - .
N T _ > _ & NOTE
| | 1. Connect Pin-2 of TP401 to Pin-3 of TP401.
1N60 À 470P = 470K 2. Keep leads between DET. and TP202 as short as
| | possible.
© ° ¢ Figure 11
ee — 1/64”
' * L210
* L212
, L214
; L216
—60 dB
|
( - 1/16”
L211 _
£213
| L215
51.5 52.5 53.5 L217 |
1ST IF ALIGNMENT
FREQUENCY (MHz)
Figure 14
| H |
TEST 1 SIGNAL
STEP | INSTRUMENT CONTROL SETTING GENERATOR | ADJUSTMENT REMARZS
CONNECTION SETTING
Set marker frequency to
OFF/VOLUME : ON Center Freg. 54.5 MHz, 55.0 MHz and
Made : AM 55 MHz 55.5 MHz
PRESELECTOR BAND Adjust L203 ~ 206. L218 and
1 Refer to > 4.5 = 12 MHz Sweep Width L203 ^^ L206 L219 ta obtain the charac.
Figure 11 PRESELECTOR TUNE 55 + 2 MHz 1.218, L219 teristic curve as shown in Figure
: 10 MHz 14.
MHz Tuning: 10 MHz The core positions of each coil
kHz Tuning : 500 kHz should be approximately as
Mustrated in Figure 15.
= 1/64”
L203
| 3-6 dB 205
= 1.218
=
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2
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&
Ln
w
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L204 7 у; | 1/16
L206 '
L218 | `
54.5 55 55.5 | Za | |
Figure 15
PRECAUTION FOR VR201 AND 1ST LOCAL OSC ALIGNMENT
Any adjustment of VR201, TC401, TC402 and T401 must be made with great precision. Do not atiempt any adjustment
unless absolutely necessary.
VR201 ALIGNMENT
NOTE: VRZ201 affects the MHz tracking. Thus, if you find it mandatory to adjust VRZ201, do so before finalizing MHz
tracking. If Y R201 adjustment has little effect, return it to the original setting.
TEST SIGNAL :
STEP | INSTRUMENT CONTROL SETTING GENERATOR | ADJUSTMENT REMARKS
CONNECTION SETTING
OFF/ VOLUME : ON 500 kHz Adjust VR201 for max. reading
Mode : AM output : on S-Meter.
RF GAIN : Max. For approx.
PRESELECTOR BAND | “3-5”
Refer to .
1 Figure 16 : 0.15 — 0.5 MHz | reading on Y R201
PRESELECTOR TUNE | S-Meter
: 0.5 MHz
MHZ Tuning: O MHz
kHZ Tuning : 500 kHz
1ST LOCAL OSC ALIGNMENT
TEST
INSTRUMENT
CONNECTION
STEP
CONTROL SETTING
SIGNAL
GENERATOR
SETTING
ADJUSTMENT
REMARKS
>
Refer to
Figure 16
OFF/VOLUME : ON
VOLUME
: For the desired audio
output.
Mode : AM
RF GAIN : Max.
ATTEN : 0dB
PRESELECTOR BAND
: 1.6 — 4.5 MHz
PRESELECTOR TUNE
: 35 MHz
MHz Tuning : 3 MHz
kHz Tuning : 500 kHz
3.5 MHz
T401
Set trimmers TC401 and TC402
to mid-capacity point.
Adjust T401 to receive SG signal.
Same as
Step 1
OFF/VOLUME : ON
VOLUME
: For the desired audio
output.
Mode : AM
RF GAIN : Max.
ATTEN : 0dB
PRESELECTOR BAND
: 12 — 30 MHz
PRESELECTOR TUNE
: 28 MHz
MHz Tuning : 28 MHz
kHz Tuning : 000 kHz
3.5 MHz
TC402
Adjust TC402 to receive the 8th
harmonic of SG signal {28 MHz).
3 Repeat Step 1 and Step 2. Check tracking at 10.5 MHz, 17.5 MHz and 24.5 MHz.
Adjust TC401 as required for optimum tracking.
As a final check, make sure 1 MHz step tracking is correct ali the way from 500 kHz to 29 MHz,
RF
SIGNAL
500
(A-1)
SET
GENERATOR
NOTE
Set SG to precisely 3.5 MHz.
—
О UNDER
TEST
FREQUENCY
COUNTER
Figure 16
RF STAGE ALIGNMENT
NOTE 1. Maintain SG output level at minimum necessary to obtain usable output (3-4 readinas on S-Mater).
=. T2C2, 203 (Ba: Antena) : Heler to Wiring Diagram.
TEST SIGNAL
STEP, INSTRUMENT CONTROL SETTING GENERATOR | ADJUSTMENT REMARKS
CONNECTION SETTING
OFF/VOLUME : ON Adjust T202 for
VOLUME : For the desired audio max. reading on
output. S-Meter.
Mode : AM
RF GAIN : Max.
Refer to ATTEN :0dB 300 kHz
1 PRESELECTOR BAND 1 kHz T202
Fiqure 16 ; 0.15 — 0.5 MHz 30% Mod.
MHz Tuning : To the point where the
max. noise appears with
~ MHz readout at “0”.
kHz Tuning : 300 kHz
PRESELECTOR TUNE : 300 kHz
PRESELECTOR BAND Adjust T203 for
- 0.5 — 1.6 MHz 900 kHz max. reading on
2 Same as Step 1 PRESELECTOR TUNE : 900 kHz 1 kHz T203 S-Metei.
kHz Tuning : 900 kHz 30% Mod.
Other Controis Setting: Same as Step 1
PRESELECTOR BAND Adjust T204 for
: 1,6 — 4.5 MHz 1.8 MHz max. reading on
3 Same as Step | PRESELECTOR TUNE : 1.8 MHz 1 kHz T204 S-Meter.
MHz/kHz Tuning : 1.8 MHz 30% Mod.
Other Controls Setting: Same as Step 1
PRESELECTOR BAND | Adjust TC201 far
: 1,6 — 4,55 MHz 4.5 MHz a max. reading on
4 Same as Step 1 | PRESELECTOR TUNE : 4.5 MHz 1 kHz TC201 S Meter.
MHz/kHz Tuning : 4.5 MHz 30% Mod.
Other Controls Setting : Same as Step 1
5 Repeat Steps 3 and 4 until no further impravement can be obtained.
PRESELECTOR BAND Adjust T205 for
. 4.5 —~ 12 MHz 5.010 MHz max. reading on
6 Same as Step 1 | PRESELECTOR TUNE :5.010 MHz 1 kHz 1205 S-Meter,
MHz/kHz Tuning: 5.010 MHz 30% Mod.
Other Controls Setting: Same as Step 1
FRESELECTOR BAND : Adjust TC202 for
: 4.5 — 12 MHz 11.010 MHz max. reading on
7 Same as Step 1 PRESELECTOR TUNE : 11.010 MHz 1 kHz TC202 S-Meter.
MHz/kHz Tuning: 11.010 MHz 30% Med.
Other Controls Setting: Same as Step 1
8 Repeat Steps 6 and 7 until no further improvement can obtained.
PRESELECTOR BAND : 12-30 MHz 13.010 MHz Adjust T206 for
о Same as Step 1 PRESE LECTOR GUNE : 13.010 MHZ î kHz T206 max. reading on
| MHz/kHz Tuning : 13.010 MHz 20% Mod S-Meter.
Other Controls Setting : Same as Step 1 © ;
PRESELECTOR BAND : 12—30 MHz 28.010 MHz Adjust TC203 for
10 Same as Step 1 PRESELECTOR TUNE : 28.010 MHz ; kHz TC203 max. reading on
| MHz/kHz Tuning : 28.010 MHz “30% Mod | S- Meter.
Other Contrals Setting : Same as Step 1 TOC |
11 Repeat Steps 9 and 10 until no further improvement can be obtained.
+ |
BFO ALIGNMENT
NOTE : Set each contral for max. reading on S-Meter.
'
TEST SIGNAL
STEP, INSTRUMENT CONTROL SETTING GENERATOR | ADJUSTMENT REMARKS
CONNECTION SETTING
OFF/VOLUME : ON Adjust L309 for
VOLUME : For the desired audio zero-beat,
Mode :LSB/CW Set Mode to USB/
Refer to PRESELECTOR BAND 7.1 MHz CW and adjust
1 :4.5— 12 MHz 100 y V L309 kHz Tuning to
Figure 16 PRESELECTOR TUNE : 7.1 MHz (No Mod.) obtain zero-beat.
RF GAIN : Max. At this time kHz
ATTEN : 0dB Readout must be
MHz/KHz : 7.1 MHz “108” — “109”,
Alternate between
i.SB and USB and
Set MHz/kHz Tuning for max. Same as Same as adjust L309 so
2 Same as Step 1 reading on S-Meter. (7.1 MHz) Step 1 Step 1 the zero-beat is
Other Controis Setting : Same as Step 1 obtained at the
same level on
S-Meter.
S-METER ALIGNMENT
NOTE
1. After checking the specified sensitivities in all bands, adjust S-Meter sensitivity.
2. Set each control for max. reading on S-Meter.
3. VR302 : Refer to Wiring Diagram.
TEST : SIGNAL
STEP | INSTRUMENT CONTROL SETTING GENERATOR | ADJUSTMENT REMARKS
CONNECTION SETTING
OFF/VOLUME : ON Adjust VR301 for
Mode : LSB/CW full-scale reading
Refer to PRESELECTOR BAND 7.1 MHz on S-Meter.
; : 4.5 — 12 MHz 1 mV VR301
Figure 16 PRESELECTOR TUNE : 7.1 MHz 1 kHz
RF GAIN : Max. 30% Mod.
ATTEN : 0dB
MHz/kHz Tuning : 7.1 MHz
7.1 MHz Adjust VR302 for
O 2 Same as Step 1 Same as Step 1 Sony VR302 e Mere of 9 on
30% Mod.
TROUBLESHOOTING GUIDE
Syimpiom
Pricerhle Cares
-— r — =
1) Pilot Lamp does not light and/or set fails
Aj
Faulty power cord.
to operate when power is ON. B) Defective Q315 and/or associated circuit com-
ponents.
C) Defective lamp.
2) Fuse blows, Al Short-circuit in the DC regulator circuit.
В) Shortcircuit in the power amplifier circuit.
3) Pilot Lamp lights but no sound on any band. A) Defective Speaker.
В) Defective PHONE and/or EXT SPKR Jack.
С) Defective IC301 and/or associated circuit com-
ponents. Proceed to A.F. OPERATION CHECK
on page 9.
D) Defective Mode switch SW-3.
4) No audio on any band. A) Faulty Local Oscillator and/or associated circuit
components. Proceed to 1ST/ZND LOCAL OSC
CHECK on page 13.
Bl Faulty RF and/or IF Stage and/or associated
circuit components. Proceed to TOTAL GAIN
CHECK on page 10 — 11.
5) LSB/CW, USB/CW Mode does not function, A) Defective SSB/CW Detector D306 ~ D309 and/or
AM Mode is OK. associated circuit components.
В! Defective BFO 0311 and/or associated circuit
Components.
6) Noisy A) Faulty RF Stage amplifier and/or associated
circuit components. Proceed to TOTAL GAIN
CHECK on page 10 — 11.
В) Faulty IF Stage amplifier and/or associated circuit
components. Proceed to TOTAL GAIN CHECK
on page 10 — 11.
C) Defective AF amplifier IC301. Proceed to AE.
OPERATION CHECK on page 9.
7) Incorrect MHz reading. A) The 1st Local OSC is out of order. See 1ST
LOCAL OSC ALIGNMENT on page 18.
В} MHz switch and linkage. See LINKAGE ADJUST:
MENT OF MHz SWITCH on page 14.
8} Incorrect kHz reading. A) Mistracking of kHz Tuning. See ALIGNMENT OF
kHz TRACKING on page 15.
B) IF Stage is out of order. See 1ST/2ND/3RD IF
ALIGNMENT.
9) kHz Display is blanked. A) 3rd Local Osc and/or associated circuit is defective.
B) The Reference OSC (4 MHz) is defective.
С) Frequency Counter (C501) is defective.
SPECIAL NOTE:
(1)
(2)
If a user is annoyed by excessive birdies, which can not be eliminated by proper adjustment of the
MHz tuning dial and/or the preselector and band switch, the problem may be caused by 1 MHz
harmanics being passed through the 2nd I.E.
The best solution is to be sure that the shield case for the counter PCB is properly grounded
(through the two wires from the RF PCB and the 4 screws). Be sure all shielding is secure. Also, try
moving wires to see if you can obtain lower level birdies. Birdies with a level of more than 10 uV
(S + N/N equals 10 dB) are out of spec; nominal spec is no more than 2 uV at 7.1 MHz.
Typically you can rule out any possibility of image response being responsible for birdies. Consider
the following example for the image of 7.1 MHz...
Fi = Fr + 21F Fi: Image Frequency
Fr : Receiving Frequency
For instance :
Fr = 7.1 MHz Fi = 7.1 + (2 х 55.4) = 117.9 МН?
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ELECTRICAL PARTS LIST
NOTE: Temperature characteristics
(Cr... NFO
{U}... N7EC
X)..... N2200
CAPACITORS
Voit Toler
Raf. No. Value 298 ance Material
(М) (9%)
C1 220pF 50 +10 Ceramic
e Not used
C3 2pF 50 10.25pF | Ceramic (C)
C101 Not used
Ci02 O.OSEUF 50 +10 Mylar
C103 0.022uF 50 +10 Mylar
C104 1uF 50 — 10, +75 Electrolytic
С105 0Q.033uF 50 +10 Mylar
C106 0.033uF 50 +10 Mylar
C107 0.027uF 50 10 Mylar
C108 47uF 10 —10, +50 | Electrolytic
c201 Not used
C202 270pF 50 +5 Polystyrene
C203 0.0474 25 —20, +80 | Ceramic
C204 0.01uF 25 —20, +80 | Ceramic
C205 0.01uF 25 —20, +80 | Ceramic
C206 0.01uF 25 —20, +80 | Ceramic
C207 3pF 50 *0.25pF | Ceramic (С)
C208 33pF 50 +16 Ceramic (C)
cz09 33pF 50 +10 Ceramic (C)
C210 pF 50 0.250É | Ceramic (C)
C211 27pF 50 +10 Ceramic {C]
C212 50F 50 10.250F | Ceramic (C)
C213 0.01uF 25 —20, +80 | Ceramic
C214 22pF 50 +10 Ceramic (C)
C215 22pF 50 +10 Ceramic {C)
C218 100pF 50 +10 Ceramic
0217 47pF 50 +10 Ceramic
218 0.07uF 25 —20, +80 | Ceramic
C219 33pF 50 +10 Ceramic (С)
C220 Spf 50 10.25pF | Ceramic (С)
C221 0.01uF 25 --20, +80 | Ceramic
C222 15pF 50 +10 Ceramic {C)
C223 0.01uF 25 —20, +30 | Ceramic
C224 0.01uF 25 —20, +80 | Ceramic
C225 3pF 50 10.25pF | Ceramic (C)
C226 0.01uF 25 —20, +80 | Ceramic
C227 82pF 50 +10 Ceramic
C228 0.01uF 25 —20, +80 | Ceramic
C229 0.01uF 25 —20, +80 | Ceramic
C230 22pF 50 +10 Ceramic (C)
C231 0.01uF 25 —20, +80 | Ceramic
C232 10pF 50 +0.5pF Ceramic (C)
C233 5pF 50 40.25pF Ceramic (C)
C234 22pF 50 +10 Ceramic (C)
C235 10pF 50 T0.5pF Ceramic (C)
C236 0.047uF 25 —20, +80 | Ceramic
C237 0.047uF 25 —20, +80 | Ceramic
C238 0.047uF 25 —20, +80 | Ceramic
C239 0.047uF 25 —20, +80 | Ceramic
C240 0.01uF 25 —20, +30 ¡ Ceramic
C241 0.001uF 50 +10 Ceramic
C242 2pF 50 0.25pF Ceramic (C)
!
| Volt Tolar-
Raf. No Value age ACA Material
(М) 1%)
C243 47pF 50 10 Ceramic
C244 0.01uF 25 «20, +80 | Ceramic
C245 0.01uF 25 --20, +80 | Ceramic
C246 ÎpF 50 10.25pF | Ceramic (С)
£247 47pF 50 =10 Ceramic
C248 0.01uF 25 —20, +80 | Ceramic
C249 QOTuF 25 —20, +30 | Ceramic
C250 0.01uF 25 —20, +50 | Ceramic
C251 ÎpF 50 20.25pF | Ceramic (C)
C252 0.001uF - 50 +10 Ceramic
C253 0.01uF 25 —20, +80 | Ceramic
C254 9.01 uF 25 —20, +80 | Ceramic
C255 0.01uF 25 —20, +80 | Ceramic
C256 SpF 50 10.25pF | Ceramic (С)
C257 3pF 50 0.25pF | Ceramic (С)
C258 Naot used
C259 Not used
C260 _ Not used
C261 Not used
C262 27pF 50 +10 Ceramic (C)
C263 47pF 50 +10 Ceramic
C264 0.01uF 25 —20, +80 1 Ceramic
C265 3pF 50 +0.25pF | Ceramic (C)
C266 0.0TuF 25 —20, +80 | Ceramic
C267 Not used
C268 0.047uF 25 —20, +80 ! Ceramic
C269 0.01uF 25 —20, +80 | Ceramic
C270 Not used
C271 ТЫ Е 50 — 10, +75 | Electrolytic
C272 0.01uF 25 —20, +80 | Ceramic
C273 10pF 50 10.5pF Ceramic
C301 150pF 50 +5 Polystyrene
C302 0.01uF 25 —20, +80 | Ceramic
c303 0.047uF 25 —20, +80 | Ceramic
C304 0.047uF 25H —20, +80 | Ceramic
C305 0.047uF 25 —20, +80 | Ceramic
C306 150pF 50 +5 Polystyrene
C307 OOTuF 25 —20, +80 | Ceramic
C+08 0.01uF 25 —20, +80 | Ceramic
C309 0.01uF 25 —20, +80 | Ceramic
C310 0.01uF 25 —20, +80 | .Ceramic
C311 0.047uF 25 —20, +80 | Ceramic
C312 0.01uF 25 —20,+B0 | Ceramic
C313 0.047uF 25 —20, +80 | Ceramic
C314 2pF 50 -0.25pF | Ceramic (C)
C315 0.047 F 25 —20, +80 | Ceramic
C316 0.047uF 25 —20, +80 | Ceramic
C317 Nat used
C318 0.047uF 25 —20, +80 | Ceramic
C319 0.047uF 25 —20, +80 | Ceramic
C320 0.01uF 25 —20, +80 | Ceramic
C321 0.0TuF 25 —20, +80 | Ceramic
C322 O.luF 50 +10 Myiar
C323 10uF 16 —10, +50 | Electrolytic
C324 0.01uF 50 +10 Mylar
C325 O.1ufF 50 +10 Mytar
C326 0.01uF 25 —20, +80 | Ceramic
C327 120pF 50 +10 Ceramic (C)
C328 680pF 50 +5 Polystyrene
C329 1000pF 50 +5 Polystyrene
C330 330CpF 50 +5 Polvstvrene
LUILS & TRANSFORMERS
Hef. No. Description RS Part No. MFR’s Part No.
L201 Not used
L202 BPF Coil СА-5014 BNNB-134
L203 RF Coil (82.5 -- 55 MHz) CA-5022 10558-127
1.204 RF Coil (52.5 — 55 MHz) CA-5027 108SB-127
L205 RE Cail (52.5 — 55 MHz) CA-5022 10SSB-127
L206 RF Coil (92.5 -— 55 MHz) CA-5022 10SSB-127
L207 Inductor {330 uH) LFi-331K
|208 Choke Coil (1.2 gH) CB-2437 4LNC-135
L203 Choke Coil {0.84 uH) CB-2195 4LNC-027
L210 RF Coil (52.5 — 55 MHz) CA-5022 10SSB-127
L211 RF Coil (52.5 — 55 MHz) CA-5022 10SSB-127
1212 RF Coil (52.5 — 55 MHz) CA-5022 10558-127
1.213 RF Coil (52.5 — 55 MHz) CA-5022 10SSB-127
1214 RF Coil (52.5 — 55 MHz) CA-5022 10SSB-127
L215 ВЕ Coil (52.5 — 55 MHz) CA-5022 10SSB-127
1.216 RF Coil (52.5 — 55 MHz) CA-5022 10SSB-127
L217 HE Cail (52.5 - 55 MHz) СА-5022 10SSB-127
L218 RF Coil (52.5 — 55 MHz) CA-5022 10SSB-127
1.219 RF Coil (52.5 — 55 MHz) CA-5022 10SSB-127
L220 Inductor (1 mH) CB-2434 LF5-102K
L301 IF Coil (3 — 2 MHz) CA-7955 10SSA-128
L302 Inductor (4.7 uH) CA-3891 LF4-4R7K
L303 IF Coil (3-2 MHz) CA 79585 10SSA-128
L304 Inductor (4.7 uH} CA-3891 LF4-4R7K
£.305 OSC Coil (3 — 2 MHz) CA-5012 19550-129
L306 Inductor (100 uH) CB-2427 LF1-101K
L307 Inductor (27 uH) CA-3730 LF1-270K
L308 Inductor (270 uH) СВ-2429 LF1-271K
L.309 BFO Coil (455 kHz) CA-5016 10850-131
L 310 Inductor (470 uH} C-0835 LF1-471K
L317 inductor (1 mH) CB-2434 LF5-102K
L501 BPF Coil CA-5014 ENNE-134
L502 Inductor (8.2 zH) СВ-2438 LF4-8R2K
L503 Inductor {1 mH) CR 2434 LF5-102K
L504 Inductor (8.2 uH) CB-2438 LF4-8RZK
T1 Power Transformer (See APPENDIX for Australian, EC, TA-0708 TK-1284
UK and Canadian Models)
T201 Antenna Coil (0.01 — 0.15 MHz) CA-5017 10SSA-123
T202 Bar Antenna Coil (0.15 — 0.5 MHz) CA-0676 12BNA-143
T203 Bar Antenna Coil (0.5 — 1.6 MHz) CA-0676 12ВМА-143
1204 Antenna Coil {1.6 — 4.5 MHz) CA-5018 6PNA-124
T205 Antenna Coil (4.5 — 12 MHz) CA-5019 GPNA-125
T206 Antenna Coil (12 — 30 MHz) CA-5020 EGPNA-126
1301 IF Transformer (455 kHz) CA-7953 10551-132
T302 IF Transformer (455 kHz) CA-7954 1055!-133
T303 IF Transformer (455 kHz) CA-7954 10SSI-133
T401 MHz OSC Coil CA-5013 10SSO-130
CERAMIC FILTERS & CRYSTALS
NOTE 1: Unless otherwise specified all resistors are carbon film,
wattage 1/4W, tolerance 35%.
NOTE 2: R2 is not used for Australian/Euronean Models.
Ref. No. Description RS Part No. | MFR's Part No.
CF301 Filter (455 kHz) | C0978 KBF455R4A RESISTORS
Xi X tal MX-2378
(4.000 MHz) Watt- | Tolar-
Raf. No. Value HS Part No. age ance Material
tw) (%)
RI 1802 NEG-0144 1 +5 Мета!
+В? 1.8MQ NEF-0521 1/2 +5 Carbon
DIODE R3 1.8M2 | NEF-0521 | 1/2 | +5 Carbon
Ref. No. Description RS Part No, | MER's Part No. R101 820 NEE-0122
D101, 102 Silicon DX-0270 | 151555 R102 | 820 NEE-0122
R103 | 1k NEE-0196
0201 Germanium DX-0161 | 1NG6O R104 ik NEE-0196
R105 | 1.8MO NEF-0521 | 1/2 | +5 Carbon
D301, 302 Germanium CS-0161 | 1N6O R106 | 3.3kn NEE-0230
D303 Not used R107 10k NEE-0281
D304 — 309 | Germanium DX-0161 |1N60 R108 | 2.2kQ NEE-0216
D310 Zener (9 V) DX-0110 | EQA01-09 (R) R103 | 390% NEE-0162
D311 Zener (10 V) DX-1213 | EQA01-10 (S) R110 | 3.3k82 NEE-0230
D312 - 316 | Silicon DX-1108 | ERB12-01
D317 Rectifier DX-1212 | 1B4B or R201 | Not used
1BaB1 R202 33k NEE-0324
D318 Zener (4.7 V) DX-1214 | 02BZ4.7V R203 | 100k | NEE-0371
D319 Zener (4 V) DX-1216 | HZ4B3 R204 | 2209 NEE-0149
D320 Zener {4.7 V) DX-1214 | 02BZ4.7V R205 | 5602 NEE-0176
R206 | 2209 NEE-0149
D501, 502 Germanium DX-0161 | 1N60 R207 | 5602 NEE-0176 |
D503 Zener (6 V} DX-1217 | EQA01-06 (R) R208 | 100k | NEE-0371
DSC4 — 508 | LED TLR312 R203 | 22kQ NEE-0311:
R210 | 2202 NEE-0149
D601 — 606 | LED DX-0496 | TLR102 R211 | 100kQ | NEE-0371
R212 | 33k NEE-0324
R213 | 33kQ NEE-0324
R214 | 220 NEE-0149
R215.| 220% NEE-0149
INTEGRATED CIRCUITS R216 | 100k | NEE-0371
R217 | 220q NEE-0149
Ref. No. Description RS Part No. | MER's Part No. R218 100k 2 NEE-0371
R219 | 2200 NEE-0149
10201 Mixer MX-3809 SN76514N R220 tk NEE-0196
R221 | 4705 NEE-0169
[C301 AF Amp MX-3383 | uPC575C2 R229 2200 NEE-0149
R223 | 27kQ NEE-0316
1C501 Freq. Counter MX-3807 M54826P R224 6.8k0 МЕЕ-0262
1C502 Divider MX-3808 SN74LS74N R225 1kQ NEE-0196
R226 | 2209 NEE-0149
R227 | 56kQ NEE-0345
R228 | 22kg NEE-0311
R229 | 6.8k2 NEE-0262
LAMPS R230 1k NEE-0196
R231 2207 NEE-0149
Ref. No. Description RS Part No. | MFR's Part No. R232 15kQ NEE-0297
PLT, 2 Preselector Dial | L-0990 | L50-F12V50 R233 | 47k | NEE-0247
(12 V, 50 mA) R234 | 1kQ NEE-0196
PL3 Meter (12 V, L-0990 | L50-F12V50 R235 | 228 NEE-0078
R236 Nat used
50 mA)
R237 Not used
R238 Not used
R239 Not used
R240 Not used
J anne
TELE WR Ey ws
Watt- | Toler- Watt- |Tolar-
Ref. No. Value RS Part No. | aga | ance Material Raf. Na. Value RS Pari No, | aga | ance viaterial
W) | (%] (wi | (%)
R241 Not used R349 1002 NEE-Q132
R242 33k NEE-0374 R3SO 2.2k$2 NEE-0216
R243 Not used R351 220k2 NEE-0396
R244 22k NEE-0311 R352 2200 NEE-0149
R245 6.8K1 МЕЕ-0262 R353 4.7kS$2 NEE-Q247
R246 1k$2 NEE-0196 R354 47k $y NEE-0340
R247 2200. NEE-0149 R355 10002 NEE-0137
R248 Not used R356 3.3kQ2 NEE-0230
R249 Not used R357 1.5MO NEE-0450
R250 47k 2 NEE-0340 R358 1kQ NEE-0196
R251 47k2 NEE-0340 R358 4.7k82 NEE-0247
R252 2200 NEE-0149 R360 2208 NEE-0149
R361 470k NEE-0423
R301 56k 2 NEE-0345 R362 1.5M NEE-0450
R302 47k NEE-0340 H363 1Oks2 NEE-0281
R303 10k NEE-0281 R364 5.6k52 NEE-0257
R304 100k 2 NEE-0371 R365 4702 NÉE-O169
R305 47k2 NEE-0340 R366 3.9k0 NEE-0237
R306 68k NEE-0354 R367 22k NEE-0311
R307 10092 NEE-0132 R268 33k NEE-0324
H308 4702 NEE-0169 R369 330 NEE-0097
A309 2.2K5 NEE-0216 R370 АЗК NEE-0337
R310 2200 NEE-0149 R371 150k NEE-0384
R311 56k NEE-0345 R372 100k©2 NEE-0371
R312 100k? NEE-0371 R373 39057 NEE-0162
R313 MO NEE-0445 R374 2.2k82 МЕЕ-0216
R314 100k? NEE-0371 R375 15k £2 NEE-0297
R315 2200 NEE-0149 R376 10k NEE-0281
R316 2208 NEE-0149 R377 1052 NEE-0063
R317 1.5k2 NEE-0206
R318 -1.5kQ NEE-0206 H401 22% 52 NEE-0311
R319 3.3k§2 NEE-0230 R402 4.7k 2 NEE-0247
R320 220k $2 NEE-0396 R403 680 2 NEE-0183
R321 10002 NEE-0132 R404 1002 МЕЁЕ-0132
R322 1k МЕЕ-0196 R405 10022 NEE-0132
R323 220 2 NEE-0149
R324 3.AK0 NEE-0230 R501 100k NEE-0371
R325 Tk NEE-0281 R502 4.7k82 NEE-0247
R326 152 NEE-0074 R503 4.7k5 NEE-0247
R327 47080 NEE-0169 R504 10052 NEE-0132
R328 2200 NEE-0149 R505 Not used
R329 4700 NEE-0169 R506 10082 NEE-0132
R330 10kS2 NEE-0281 R507 1002 NEE-0132
H331 33k NEE-0324 R508 3.3k0? NEE-0230
R332 470k NEE-0423 A509 2.282 NEE-0216
R333 10k NEE-0281 R510 180k $2 NEE-0384
R334 470ks7 NEE-0423 R511 3302 NEE-0159
R335 470k NEE-0423 R512 4708 NEE-0169
R336 3.9k2 NEE-0237 R513 270k? NEE-0402
R337 22k2 NEE-0311 R514 KO NEE-0281
R338 33k 2 NEE-0324 R515 1002 NEE-0132
R338 180 NEE-0303 R516 22kQ NEE-0311
R340 33kQ NEE-0324
R341 1k2 NEE-0196 R701 15k2 NEE-0297
R342 1kQ NEE-0196 R702 2.2kQ2 NEE-0216
R343 100k&2 NEE-0371 - =
R344 1002 NEE-0132
R345 2.2kQ2 NEE-0216
R346 1k 2 NEE-0196
R347 100k? NEE-0371
R348 2208 NEE-0149
RESISTCR ARRAYS | TAANSISTORS
Ref. No. Description RS Part No. | MFR’s Part No. Ref. No. Description RS Part No. | MFR’s Part No.
RA701 1.5kf2x 7 RX-0090 EXB-R7152M
RA702 1.5 ка х 7 AX-0090 | EXB-R7152M 0201 RF Amp. 35K45(81-9
Q202 1st Mixer 25K19(Y) or
2SK19(GR)
203 15% Mixer 25K19(Ÿ} or
2SK19(GR)
Q204 Gain Contra! 25C1B15(GR)
0205 1st IF Amp. 35K45{B)-9
SWITCHES 0206 2nd Mixer 3SK45(B)-9
Ref. No. Description | RS Part No. | MFR's Part No, 0207 52.5 MHz Local 28С1323(8)
Freq. Amp /
SW1 Lever Switch 5-0919 SLR-523 Q208 52.5 MHz Local 25C1923(0)
(ATTEN) Freq. Amp
ЗУМ2а = * | Rotary Switch 5.1326 SRN3066N Q209 52.5 MHz Local 25C1923(0)
(PAESELECTOR Freg. Amp
BAND) Q210 Not used
Swia—c | Rotary Switch S-1327 SAN2045N Q211 Not used
(Mode) 0212 Not used
Swáa—c | Lever Switch s-0920 SLA-643-02 Q213 Switching 25C1815(GR)
(LIGHT/BATT) Q214 1st IF Amp. 25C1923(0)
Sw5a, b Lever Switch s-0919 SLA-523
(AUDIO) 0301 2nd IF Amp. 35K45(B)-9
SW6a, b Power Switch Q302 3rd Mixer 3SK45(B)-9
included in VOL- Q303 3rd IF Amp. 2SC1815(Y)
UME Control VR? Q304 3rd IF Amp. 2SC1815(Y)
SW7 Rotary Switch 35-1325 CB-2-29 Q305 AGC Switch 2SC1815(GR)
(included in MHz/ Q306 3rd Local OSC 25C1815(Y)
kHz Tune Ass'y) Q307 Buffer Amp. 25K19(GR)
Q308 Buffer Amp. 2SK19(GR)
Q309 Not used
Q310 AGC Amp. 2SC1815(GR)
Q311 BFO 25K19(GAR)
Q312 AF Preamp. 25C1815(GA)
Q313 Buffer Amp. 2SC1815(GRA)
Q314 Buffer Amp. 2SC1815(GR)
THERMISTOR Q315 Regulater 25D526(0)
Q316 Meter Calibrator 2SC1815(GR)
Ref. No. Description RS Part No, | MER's Part No.
0401 tst Local OSC 25C1923(0)
TH301 10kQ T-1012 M-10K
Q501 Driver Amo, ASC18i5(GA)
502 Regutator 25052610}
Q503 kHz Display Driver 28C1815(GR)
O504 kHz Display Driver 25C1815(GR)
Q505 kHz Display Driver 2SC1815(GA)
Q506 Buffer 25C1815(GR)
Q507 2nd Local OSC 25C1815{GR)
Q508 Gain Controi 25C1815(GA)
Q701 MHz Display SW 250526(0)
Q702 MHz Display SW 2SC1815(GR)
VARIABLE CAPACITORS
—— o
—
Ref. No. Description RS Part No. MFR's Part No.
TC201 — 203 Trimmer (50pF) C-0979 ECV-1ZW50X32
TC301 — 303 Trimmer (50pF) C-0561 ECV-1ZW50X32
TC401 Trimmer (50pF) C-056 1 ECV-1ZW50X32
TC402 Trimmer (10pF) C-0870 ECV-1ZW50X53
NA" PRESELECTOR TUNE inciuded in Preselector Dial C-4671 C123A214
Ass'y 129)
VC2 — 4 kHz Tune included in MHz/kHz Tune Ass'y (30) C-4673 PYC-20G311-10H
VCS MHz Tune included in MHz/kHz Tune Ass'y (30) (4764 C521C133
\/Сб FINE TUNE C-4675 FT7-25 NE
VARIABLE RESISTORS
Ref. No. Description RS Part No. MFR’s Part No.
Y R201 Semi-fixed (4.7 kS2 B} P-1936 SR19R3 4.7kB
Y R301 Semi-fixed (50002 B) EVN-JOAAQOBSZ
VH302 Semi-fixed (20 k? 8) EVL-TOAA00B24
Y HT RF GAIN Cantral (50 k? 8) Р.1937 VM10A620C-50kB
V R2/(SWE6) VOLUME Control (50 k2A) w/Power Switch P-1938 VMITAAJOC-
5M1222-50kA
MISCELLANEQUS N
Ref. No. Description RS Part No. MFR’s Part No.
RF P.C. Board GE-22C-6688A
IF/AF P.C. Board GE-22C-6695C
AUDIO/ATT P.C. Board GE-22C-6698A
MHz P.C. Board GE-220-6696A
MHz Switch P.C. Board GE-22C-6949A
_ Counter P.C. Board GE-22D-6948
LED P.C. Board | GE-22D-6947
Band Display P.C. Board GE-22D-6946
A ANT Jack J-1009 NC-552-D
J1 KEY Jack J-0840 S-G8022
J? Phone Jack J-1013 S-G7625
J3 External SPKR Jack J-(1840 S-G8022
J4 DE 12 Y Jack J-1010 ND-409
Jb TAPE QUT Jack J-1011 NR-205-2
8P Wire Connector Ass’y GE-23D-7082
9P Wire Connector Ass'y GE-23D-7083
Connector (8P : male) 5048-08A
Connector (9P : male) 5048-09A
TP401 Connector (3P : male) for Test Point 5048-03A
TP201 — 206 Test Point CHP-01
TP301, 302 Test Point CHP-01
TP501, 502 Test Point CHP-01
MECHANICAL PARTS LIST
O NOTE: " Australian, EC, UK and Canadian Models employ different part. Refer to the APPENDIX for these models.
uy Ref. No. Description RS Part No. MFR's Part No.
(1) RF GAIN Control P-1937 VM10A620C-50k8
(2) VOLUME Control with Power Switch P-1938 VM11AAQQC-
5M1222-50kA
(3) Rotary Switch (Mode) S-1327 SRN2045N
(4) Rotary Switch (PRESELECTOR BAND) 5-1326 SRN3066N
(5) Variable Capacitor (FINE TUNE) C-4675 FT7-25-NE
(6) Knob (PRESELECTOR TUNE) K-3326 СЕ-230-7069
(7) Knob (FINE TUNE) K-3327 GE-23D-7036
(8) Knob (VOLUME/RF GAIN/PRESELECTQOR ВАМО/Мосе) K-3330 GE-23D-7070
(9) Knob (ATTEN/LIGHT/AUDIO) K-3331 GE-23D-7071
(10) Knob {kHz Tune) K-3328 GE-23B-7068
(11) Knob (MHz Tune) K-3329 GE-23B-7067
(12) IF/AF P.C. Board Ass'y X-8002 GE-23E-7389
(13) RF P.C. Board Ass'y X-8003 GE-23E-7390
(14) MHz P.C. Board Ass'y X-8004 GE-23E-7391
(15) MHz Switch P.C. Board Ass’y X-8005 GE-23E-7392
(16) Audio/Att P.C. Board Ass’y X-8006 GE-23E-7393
(17) Counter P.C. Board Ass'y X-8007 GE-23E-7394
(18) LED P.C. Board Ass'y X-8008 GE-23E-7395
(19) Band Display P.C. Board Assy X-8009 GE-23E-739¢
(20) Speaker S-4793 SR-305-10B
(21) Meter (S/BATT) M-0412 49C334
A-2 (22) 4P Screw Terminal Strips {ANT/GND/MUTE) J-4584 UB-1004
0 (23) ANT Jack J-1009 NC-552-D
(24) FUSE Holder (0.5 A) F-1069 S-N1301
(25) DC 12 V Jack J-1010 ND-409
(26) TAPE QUT Jack J-1011 NR-205-2
(27) KEY Jack/SPKR Jack J-0840 S-G8022
(28) PHONE Jack J-1013 S-G7625
(29) Preselector Dial Ass’y D-3264 GE-23E-7398
Preselector Gear Ass'y RA-2664 GE-23-E-7197
Dial D-0407 GE-23C-7196
Variable Capacitor C-4671 C123A214
(30) MHz/kHz Tune Ass'y C-4672 GE-23E-7399
MHz/kHz Gear Ass'y GE-23E-7198
Rotary Switch S-1325 CB-2-29
Variable Capacitor C-4673 PVC-20G3J1-10H
VC P.C. Board X-8010 GE -22D-6990
Variable Capacitor C-4674 C521C133
(31) Bar Antenna CA-0676 12BNA-143
(32) Holder for Bar Antenna No. 152
* (33) Power Transformer TA-0708 TK-1284
(34) Front Panel Ass'y Z-4522 GE-23A-7064
Front Panel
Preselector Window
Frequency Window
(35) Chassis GE-23A-7058
(36) Cabinet GE-23A-7059
(37) Rear Panel Ass'y Z2-4523 GE-23E-7401
Rear Panel GE-23A-7065
0 Battery Terminal (A), + HB-8335 GE-230-7117
Battery Terminal (B), — HB-8336 GE-23D-7118
Battery Terminal (C), + HB-8337 GE-23D-7119
Battery Tube B-0384 GE-23D-7384
(38) Battery Cover DB-0265 GE-238-7066
Ref. Na.
Description
(39)
(40)
(41)
(42)
(43)
(44)
(45)
(46)
(47)
(48)
(49)
(50)
(51)
(52)
(53)
(54)
(55)
(56)
(57)
(58)
(59)
(60)
(61)
(62)
(63)
(64)
(65)
(66)
(67)
(68)
(69)
(70)
(71)
(72)
Bracket for RF GAIN/VOLUME Cantrois and Mode SW
Bracket for PRESELECTOR BAND SW
Bracket for Meter ,
Bracket for Preselector Dial Lamp
Lug Terminal {2P)
Lug Terminal (5P)
Shaft, PRESELECTOR BAND SW
Coupler, Shaft and PRESELECTOR BAND SW
Bracket for Front Panel (A)
Bracket for Front Panel (B)
Foot (L)
Foot ($)
Hand Strap
Shield Case (Top) for Counter P.C. Board
Shield Case (Bottom) for Counter P.C. Board
Pressure Terminal
Solder Lug Terminals
Wrapping Posts
Insulator for Band Display P.C. Board
Protection Cloth for Lever SW (ATTEN/LIGHT/AUDIO)
Protection Cloth for FINE TUNE Controi
Protection Cloth for Rear Panel
Protection Cloth for Counter Case and Cabinet
Protector for Hand Strap
Lamp, Meter and Preselector Dial
Lamp Grommet for Meter
Lamp Grommet for Preselector Dial
Wire Clip
Wire Clip (A1)
Wire Binder
Wire Grommet
* AC Power Cord (6 Feet, UL, Black)
*
Cord Strain Relief
Wrapping Post for AC Power Cord
Fuse
Fuse Caution Label (0.5 A)
Causion Label
Model Label
Screws
Pan-Head Taptite Screws
Pan-Head Taptite Screws
Binding-Head Self Tapping Screws
Pan-Head Self Tapping Screws
Pan-Head Self Tapping Screws
Round-Head Self Tapping Screws
Binding-Head Screws
Binding-Head Screws
Binding-Head Screws
Binding-Head Screws
Binding-Head Screws
Pan-Head Screws
Pan-Head Screws
Pan-Head Screws
Pan-Head Screws
Fiat-Head Screws
Pan-Head Screws
Binding-Head Screws
RS Part No.
e E rd
HB-8339
HB-8340
HB-8341
НВ-8342
RT-1953
HB-8344
F-0249
F-0250
H-6250
H-6251
L-0990
HB-1182
HB- 8338 ©
HF-0025
HD-3020
HD-3026
HD-2057
HD-3108
HD-3030
HD-3047
HD-3049
HD-2044
HD-2054
HD-2055
HD-2057
HD-4019
HD-1181
MEFR's Part No.
pa aa LAA LADA O MEd AL AAN A CE NAM DA, a
GE-23D-7241
GE-23D 7062
GE-23D-7061
GE-23D-7063
1L2P
TLSP
GE-23D-7120
GE-23D-7194
GE-23D-7060
GE-230-7060
NO. 7112
NO. 7105
GE-23D-7121
GE-23C-7115
GE-23C-7116
1-50
Зо
1.2 х 12.5 mm
GE-23D-7313
GE-23D-7374
GE-23D-7375
GE-23D-7472
GE-20D-5297
GE-23D-7404
L50F 12V50
BU687
GE-23D-7243
220-1D4852 10-01
GE-23D-7319
BK-1
OCB-500
KP-10, AWG-18
SA-3P4
GE-18D-4215
0.5A, UL
GE-23D-7537
GE-19D-4860
GE-22D-6998
3x 10 mm
4x8 mm
2.6 x 7 mm
3 x 6 mm
3x 8 mm
3 x 6 mm
2 x 6 mm
3x 12 mm
4 x 8 mm
4 x 10 mm
4 x 15 mm
2.6 x6 mm
3x 5mm
3x6 mm
3 x 8 mm
3 x 6 mM
3 x 6 mM (Nylon)
3 x 6 mm (Black)
Ret. No. _— Descrintion no Part No. MEFR's Fart No. |
(73) Internal Star Lock Washers HD-8045 2.6 9
(74) Internat Star Lock Washers HD-8041 30
(75) Flat Washers 36 ;
(76) Hex Nuts HD-7003 Зо
(77) Hex Nuts HD-7088 9 ¢ (Black)
(78) Speed Nuts HE-7013 PSN-3
ACCESSORY LIST
Ref. No. Description RS Part No. MFR’s Part No.
DC Power Card Ass'y DC-1021
Fuse Caution Label ; GE-23D-7491
Antenna Ass'y A-0323 GE-23E-7402
Antenna
Connector (Plug)
Rubber Feet SJ-5112
APPENDIX TO PARTS LIST
For Australian, EC, UK and Canadian Models, some parts are changed.
models.
Australian model
Following parts list information applies to thesa
Ref. No. Description RS Part No. MFR's Part No.
(33) Power Transformer K6218
AC Power Cord , SAA 3p 2m
Strain Relief SR-5N-4
Model Label GE-23D-7332
Terminal Block 12 pins 3012PT-12
Fiber for Terminal Block GE-23D-7435
R2 Not used
EC model
Ref. No. Description RS Part No. MER's Part No.
(33) Power Transformer K6218
AC Power Cord KP-419C, LTCE-2F
Strain Relief SR-4N-4
Mode! Label = GE 23D-7184
Cord Label
Az Not used
UK model
Ref. No. Description RS Part No. MER's Part No.
(33) Power Transformer K0218
AC Power Cord BS 2p 2m
Strain Relief SR-4N-4
Model Label GE-23D-7184
Cord Label
R2 Not used
Canadian model
Ref. No, Description RS Part No. MFR's Part No.
(33) Power Transformer — TK1284B
AC Power Cord CSA 6 feet 3p
Strain Relief SR-SN-4
Model Label GE-23D-7183
PIN 8
TAB
SN74LS74A
(3)GH-—{> eux
à |-—(6)(8) TWO F.F.S
CLA IN ONE PACKAGE
ce
TRUTH TABLE
INPUTS
OUTPUTS
D | CLOCK | PRESET { CLEAR | OQ Q
+ Y ac
H 1 H H H L 5
с ; TIA | Ÿ
1 : POSITIVE TRANSITION L t ANY
= >
SN76514N (3
PIN 8
PIN 14
ET 3
—e
ODE) GD : ne E
TRANSISTOR LEAD IDENTIFICATION
(A);
(В);
(С);
(D);
M54826P
2SK19(Ÿ)
2561815, 25C1923
250526
ISK45(B)-9
NOTE
1 Notused
2 Notused
3
4 } 4 MHz Crystal Oscillator
5 Ground
6 INPUT (2456 ~ 3455 kHz)
7 Count Mode/Preset Selection Input S1: Low
8 Count Made/Preset Selection Input S2; Low
9 Count Mode/Preset Selection Input S3: Low
10 Count Mode/Preset Selection Input Sá: Low
11 Notused .
12 Segment Output:
13 Segment Output:
14 Segment Output:
15 Vee (+5 V)
16 Segment Output;
17 Segment Cutput;
18 Segment Output;
19 Segment Output;
20 Not used
21 Not used
22 Digital Cutput; D506
23 Digital Qutput; D507
A CO
Nu Oa co
24 Digital Output: D508
SEMICONDUCTOR VOLTAGE READINGS
u
I
a Vals = "a Value ; Value
Raf Nn (м оС) Ра’. No. (V DC) | Het. No. {V DC)
Gi 1.3 B 46 PB 23
201 G: 5.3 Q303 С 8.0 0504 С 0.3
D 3.2 E 3.9 E 0
5 1.85 В 2.2 В 0.15
G 0 Q304 с 8.4 Q505 С 03
0202 D 9.2 É 1.5 E 0
$ 1.8
В - 0.65 В 0.4
с a 0305 С [a Q506 С 1.65
0203 D 9.2 E 0 E 0
$ 1.8 8 2.3 B 10
B 0.65 Q306 С 38 0507 С 3.8
07204 С e o E 1.8 E 0.65
Е 0 G 0 B 0.75
Gi 0 0307 D 5.6 0508 С 0
07208 Gz 44 S 0.6 E 0
D 8.9 5
5 0.6 . G 1 Г 1.4
азов D 5.6 2 1.8
GI 0 S 0.75 3 0.2
В Gz 0 4 0.65
0706 D 9.3 Q309 Not used 5 0
$ 0.23 В 0.2 6 1.65
9310 С 8.5 7 0
B 1.8 а
Q207 с 9.2 = 8 o
E 1.05 G 0 10
B 2.1 0311 2 13 11 0.15
0208 С 9.1 ; C501 12 ee | 09
E 1.35 B 1.6 13 0.9
5 >> 0312 С 28 14 0.9
0208 С 95 E 0.95 15 50
16 0.9
E 1.5 В 23
0313 С 45 17 0.9
Q210 Not used E 165 18 0.9
- 19 0.9
Q211 Not used НИ a a5 * 20 05
©0212 Notused Q314 € 3.9 2 0.5
| B 065 © Е 3.3 23 oe
@213 С ... o 8.5 В 10.3 a - O5
E 0 0 0315 с 13.8
5 55 E 9.6 1 1.65
Q214 С 9.2 | B 0.6 2 1.65
Е 1.6 0316 С 0 3 5.0
É О 4 15
1 — 5 1.65
2 8.75 1 1.75 6 5.0
3 8.75 2 135 . 7 4.5
à 4 35 3 13.0 1C502 8 5.0
5 28 4 79 9 1.6
6 0 1301 5 6.8 10 0.75
7 13.8 11 5.0
1201 8 - 7 0.24 12 16
9 2.8 8 1.9 13 1.6
11 43 В 15 14 9
12 435 Q401 C 8.4 B | 0 0.65
: E 1.3 Q701 С *** | 35 0
13 8.75
14 _ B 1.0 E Loo
GI 1.7 9501 С 0.5 В 0.65 0
G2 2.7 E 0 Q702 С sow 0.65
Q301 Е 0 0
D 9.3 B 5.6
с 2.3 0502 С 13.8
G1 O E 5.0
Ga 0.36 B 0.15
0302 D 8.5 Q503 С 0.3
$ 0.5 E 0
NOTE
1. DC voitage measured with DC VTVM (input impedance = more than 100 k$2) under the following conditions ;
RF GAIN : Maximum
No input signal
2. (*) The voltage readings are under the condition that PRESELECTOR BAND switch is set to ranges of 0.01 — 1.6 MHz.
3. (**) The voltage readings of IC501 are under the condition of kHz readout “000”.
4. (***) The voltage readings are under the condition that MHz readout is blanked.
SCHEMATIC DIAGRAM OF DIGITAL FREQUENCY READOUT SECTION
- | < Vce [+5
—
wn
INPUT (2456 - 3395 kHz)
TS} 4 MHz CRYSTAL OSILLATOR
—* Тео в |6 Бол Г сл Та} 60
H7G1 15k
R702 2.2k0
RA7O! RA702 15k) x 7
D504 ~ 508 TLRI2x5
0503 - 506 25C1815IGA) x 3
Q701 25052610)
0702 25CIBISIGAI
1С501 M54826P
kHz
DIGITAL FREQUENCY READOUT |——]
ROTARY SWITCH SW7 (FOR MHz READ OUT) LEDs (D504- 508} FREQUENCY COUNTER IC501 LEAD IDENTIFICATION
*
1. TERMINAL DESIGNATIONS (Soldering Side View) 1. LEAD IDENTIFICATION UP/DOWN COUNT MODE ; DOWN COUNT
Mounting Side ‘Soldering Side View $ Not used
- | 1 Segment Aa ot used
8 —Р Фо © 8 , ? Segment Ff 3 | 4 MHz Crystal Oscillator
y. : 5 | О NE | J Segnent Ee 5 Ground
© 7 © > | (9) Y 1 (2) 4 Segment Dd 6 INPUT (2456 ~ 3455 kHz)
6 ©@— в ©- ? (8) "===" © 5 Common Cathode ? Count Mode/Preser Selecuon Inpur S1: Low
7 A (©) N = \ 6 Segment Cc 8 Count Mode/Preser Selection Input S7: Low
~~ — 0 — 6 (7) y vu (a) 7 Do Anode 9 Count Mode/Preset Selection Input 53: Low
5 NY O0-— 5 ОВ ==> 8 Segment G.g © unt Mode/Preser Selection lapur 54; Low ;
| | - 9 Segment Bb 12 Segment Cutout. g
1 | | | 10 Common Cathode 13 Segment Output: t
| 14 Segment Output; €
8 A O а 15 Vee (+5V)
2. EQUIVALENT CIRCUIT 16 Segment Output: d
3 ——(0)—— ! 17 Segmen: Output: €
E———O- 3 18 Segment Output: b
2 —t (Ee — 1 2 3 4 68 7 8 9 19 Segment Output; a
i (а) [| (e)— 2 20 Not used
"| © © 11414173 de Den ou, 0506
= Y Y Y Y 2 Lhaital Quipus, 0506
, | (4) | (Mm) Lol * N TY * * 23 Digital Queput: 0507
| | TT д 0 24 Digital Output, OSCR
si ®2 53 sa
5 10
2. CONTACT FOR LED SEGMENTS
LED Segments Contact
Sia
Sia
Sm
Sar
523
Sar
Jr
Si
Ss
Sn
Saz
Si:
Si
Dp (Decimal Point)] Sn
monas
D505
i= AD Ow
M — While the rotary switch steps UP,
DOWN to next contact. Sar con-
tacts and It Not only drsables LEDs
(D504, 505) but mute the unit.
2 -- Common (+5 V)
O- Not used
3. FREQUENCY READOUT POSITIONAL WEIGHT
10 MHz ---D504
? MHz =--D505
100 kHz -—-D506
10 kH7 =--0507
TkHz -=-0508
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Service formen
Catalog No.: 20-204 /
Description: DX-300 - Communications Receiver
ale -
NOTE: First shipments of the DX-300 showed varivus problems with
| spurious responses on the bands and improper centering of BFO
(for SSB reception). The manufacturer has instituted a number
of changes which help to reduce or eliminate such “birdies” and
“spurs”, plus the BFO setting. This addendum covers those and
0 other changes.
Modification for improvement of 2nd Local Oscillator Circuit (From Date Code ЗАЗ)
See Figure 1.
1. Resistor R227 location has been changed and PC pattern is cut as marked.
2. Resistor R251 iocation has been changed and PC pattern is cut as marked.
You may want to make both of these changes on all units brought in for service/repair which have
a date code prior to 3A9. Be sure to realign the 2nd Local Oscillator as stated on page 17 of Service
Manual since above changes affect frequencies of L212 and L214.
—Top View-— OLD
—Bottom View-—
ra FATE SE
CORREAS
TA PEC,
) Jun -
0203 A + De
р в > Do. So ‘cass | ;
q az |
Là €
O fad
MHz c240_
| 1 ue A 1] > = == .
ВЫ | et NE - [TP204
E e
— Top View-- NEW —Bottom View--
“т orne res tomar gp > R231 ad I "= — y 6248” . Tre oc =;
ig
а _ EA eT ”
Cut the pattern
Figure 1: RF P.C. BOARD PARTS LOCATION
3. At an early stage of production, coaxial lead for 2nd IF input to L301 was soldered as shown
—- in “old” of Figure 2. If a unit with such wiring is brought in far renair/service, change the wiring
` ! r 48 ir oon
— as shown in “new” figure.
. OLD
—Top View-— —Bottom View-—
as: NEW
o .. —lop View— -Battom View.
Figure 2 : [F/AF P.C.BOARD PARTS LOCATION
Modification of BFO (From Date Code 3A9)
C345 was changed from 43pF (NPO) to 27pF (N?P0). Units which have a date code prior to 3A9
should have this change made. After the change, realign BFO as stated on page 21 of Service Manual.
Modification for improvement of 2nd !F circuit (From date code 4A9)
~~" To avoid oscillation when the kHz readout is indicating below “050”.
R301 was changed from 56 K ohms to 33 K ohms. Units which have a date code prior to 4A9 should
haus + Был mama AA
“
— a ne a a A A A AAA Aa
Modification of AGC time constant for improvemen: for SSB reception (From Date Code 3A9)
To lengthen the release time of AGC when receiving strong SSB signals, make the following changes.
Cr ira ra >
Yar Vr bw A gd Awd “ай
1. Dalets 2243 22,2 Е alectralyvtic capacitar
2. Change R353 from 4.7kQ te 10kQ.
3. Add following parts.
Q317 Transistor 2SC1815(GR)
C376 Electrolytic Capacitor 100uF/16WV CEO2W1C101C
C377 Electrolytic Capacitor Tu F/50WV CEO4W1H010
C378 Electrolytic Capacitor 1j F/50WV CE04W1H010
R378 Carbon Film Resistor 10kQ2. 1/4W +5% R25-103J
R379 Carbon Film Resistor 6.8kQ 1/4W +5% R25-682J -
R380 Carbon Film Resistor 100k? 1/4W +5% R25-1041
Lug Terminal > TL3P
Do O Rare 6.8K2,
carr *ecazg |
| ©. | WF $8361 в СЗа4
0310 | 25CI8ISIÓN) |
| J D304
— | R378 10KS2 te
_ (C5
| + > | mare
map Row
| Ï N | | °
Te]
| STAND BY]
| USE AMAN]
12
Figure 3
i
me
}
e
MODE SELECTOR sW3a
| FROM
Connect to MODE C376
~ SELECTOR SwW3a ;
RF GAIN
SINE
ORG
BACK VIEW OF WAFER A
1L 3P LUG TERMINAL Figure 4
RADIO sHack BE a DIVISION OF TANDY CORPORATION
U.S.A.: FORT WORTH, TEXAS 76102
CANADA: BARRIE, ONTARIO L4M 4W5
TANDY CORPORATION
AUSTRALIA BELGIUM ик.
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