Realistic TRC-410 User manual

Service
CB 40-CHANNEL TRANSCEIVER
TRC-410
Catalog Number • 21-1504
CUSTOM MANUFACTURED FOR RADIO SHACK MA DIVISION OF TANDY CORPORATION

CONTENTS
1.
SPECIFICATIONS 
3 - 4
2.
BLOCK DIAGRAM 
5
3.
ALIGNMENT INSTRUCTIONS 
6 - 9
4.
FREQUENCIES GENERATED AND MIXED TO OBTAIN EACH CHANNEL

9
5.
TRANSISTOR LEAD IDENTIFICATION AND IC INTERNAL CONNECTION .. 10 - 11
6. TROUBLESHOOTING

12
7. TRANSISTOR AND IC VOLTAGE CHART

13
8.
PRINTED CIRCUIT BOARD (TOP VIEW)

14 - 15
9.
PRINTED CIRCUIT BOARD (BOTTOM VIEW)
 16 - 17
10.
ELECTRICAL PARTS LIST

18 - 21
11.
EXPLODED VIEW PARTS LIST

21
12.
SCHEMATIC DIAGRAM

22 - 23
13.
EXPLODED VIEW/DISASSEMBLY INSTRUCTIONS 
24 - 25

1. SPECIFICATIONS
GENERAL SPECIFICATIONS
Description
Transmitter

Crystal controlled PLL synthesizer, amplitude modulation
Receiver

Crystal controlled double conversion, superheterodyne system
Communicating frequencies
All 40 CB channels (26.965 to 27.405 MHz)
Voltage operation
12 — 16 V DC
(positive or negative ground vehicles)
Temperature and Humidity range
—30
°
C to + 60
°
C and 10% to 90%
Electronic
STANDARD TEST CONDITIONS
Battery supply voltage

13.8 V DC
Modulation

1000 Hz, 30%
Receiver "outputpower

500 mW at external SP.
Receiver output impedance

8 ohms, non-inductive
Ant. load impedance of transmitter

50 ohms, non-inductive
Ambient conditions
temperature 
17 to 23 ° C
humidity 
40 to 70%
TRANSMITTER SPECIFICATIONS
Description 
Nominal

Limit
RF power output  . 4.0 watts (max.) . . . .... 3.6-4.4 watts
Emission 8A3
Modulation capabilities
 +90%, —95%
AMC Range at 1 kHz
 40 dB 
> 30dB
Frequency accuracy 0 002% . .... . . . . . ...
 0.005%
Transmitter/Receiver switching

Spurious radiation & Harmonic
signal radiation ratio from fundamental
Current consumption
unmodulated 
80% modulated 
Envelope distortion 
Hum and Noise level

Stability against variation of
antenna impedance

1050 mA 
1400 mA
1600 mA 
1950 mA
10% max. 1000 Hz, 50% mod.
40 dB min. below max. mod.
Satisfactory when dummy antenna
is varied from 40 ohms to 200 ohms.

—65 dB

—60 dB

RECEIVER SPECIFICATIONS
Description

Nominal 
Limit
Intermediate frequency
1st IF 
10.695 MHz
2nd IF 
455 kHz
Sensitivity for 500 mW output 
0.25 ,uV

0.5 ,uV
Sensitivity at 10 dB S + N/N 
0.6 ,uV  1.2 AN
Adjacent channel rejection 
60 dB 
56 dB
Image rejection (1st IF/2nd IF)

45 dB 
35 dB
IF rejection ratio (1st IF/2nd IF)

70 dB
 60 dB
Signal-to-Noise ratio
at 1 mV input

40 dB 
34 dB
Distortion at 1 mV input,
50% mod. (500 mW out)

3% 
6%
AGC Figure of merit at 50 mV input

90 dB

70 dB
Power output at 500 ,uV Input
Undistorted (10% THD) 
3.5 W 
3.0 W
Maximum 
6.0 W 
4.0 W
Electrical fidelity compared to 1000 Hz
450 Hz 
—5 dB 
—6+3 dB
2500 Hz

—5 dB 
—6+3 dB
Cross modulation 
50 dB 
45 dB
Squelch
Adjustable from 0.6 AN to 1 mV
Current consumption (no signal)

190 mA

280 mA
"S" meter sensitivity to light 4th LED

10 ,uV 
5 — 20 pV
OTHER ITEMS
Fuse 
2 Amp.

General power requirement
12 — 16 V DC
Dimensions 
(H) 1-18/32"(40mm) x (W) 4-30/32"(125mm) x (D) 8-5/32"(207mm)
Weight

2 lb 2 oz. (1 kg)
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.
4

2. BLOCK DIAGRAM

Q15 Base of
oo
Output of CF3
Base of 04 1
Frequency Counter
output of CF-3
Figure 2
R7I / R 72
DC VOLT METER
I
Figure 3
Base of QI5
RF V.T.V.M.
3. ALIGNMENT INSTRUCTIONS
Bose of 017
A. PLL SECTION
1. Test Equipment Required
a.
Frequency Counter
b. DC Power Supply (13.8 Volt, 2.5 Amp.)
c.
DC Volt Meter (above 100 KQ/V)
T8

TI I
 ©I
=,3 fiR72
1-10
J 3R71
CF3
C75
T5
R2I

04

T3
T
T4
VR4
D VR5
017
5
015 L5
O

L4
ANT. JACK
EXT .SP. JACK
NOTE: Figure 1 provides test point and
alignment location information.
2. Alignment Procedure
CHANNEL
SQUELCH
VR 2
VOLUME
VR I
Figure 1
TI
al
STEP
OUTPUT INDICATOR
CONNECTION
ADJUST
ADJUST FOR
1
MIC: Receive, POWER: "on", VOLUME: Optional, SQUELCH: Optional, Channel Selector: Optional.
2
Connect Frequency Counter to output
of CF-3 (Figure 2).
C75 If the frequency is not 10.240 MHz ± 400 Hz,
change value of C75 (18-39 pF).
3
MIC: Transmit, Channel Selector: Channel 40.
4
Connect DC Volt Meter to R71/R72
(Figure 3).
T8
Alignment of VCO
Adjust for 6.0 Volt indication on DC
Volt Meter.
5
MIC: Receive, Channel Selector: Channel 1.
6
Same as step 5.
Check for indication on DC Volt Meter; must be 2.5-3.5 Volt.
If DC Volt Meter does not indicate 2.5-3.5 Volt, readjust T8
(return to step 4).
B. TRANSMITTER SECTION
1. Test Equipment Required
a.
RF Output Power Meter
b.
50 Ohm Load (non-inductive)
c. RF Attenuator
d. Oscilloscope
e. Audio Generator
f.
DC Power Supply (13.8 Volt, 2.5 Amp.)
g. Field Strength Meter (or Spectrum Analyzer)
h.
Frequency Counter
i.
Coupler
NOTE: Figure 1 provides test point and alignment location information.
2. Alignment Procedure
Figure 4
STEP
SIGNAL SOURCE
CONNECTION
OUTPUT INDICATOR
CONNECTION
ADJUST
ADJUST FOR
1
Set Channel Selector to Channel 18.
2 Disconnect R95 (or short base of Q17 to ground with 0.01 ,u F).
3
Connect RF V.T.V.M. to base
of Q15 (Figure 4).
T10
Alignment of
Pre-driver Stage
4
T11
Adjust for maximum
indication on RF V.T.V.M.

RF Power Meter
Dummy Load
Antenna
Jack
Audio Gen. 
Oscilloscope
Figure 7
Coupler
SET .
RF Power Meter Dummy Load
Q17(Short base with 0.0IpF) or R95(Disconnected)
SET
Antenna
Jack
Coupler
Frequency
Counter
DC
Power Supply
TOP VIEW
Figure 5 
Figure 6
— 7
111111111111111
12171117151
00
0.0IpF
STEP
SIGNAL SOURCE
CONNECTION
OUTPUT INDICATOR
CONNECTION
ADJUST
ADJUST FOR
5
TMake
sure that the level (at base of Q15) of Channel 1 and Channel 40 is above 450 mV on RF V.T.V.M.
I
Make sure that the differential level (at base of Q15) of Channel 1 and Channel 40 is below 50 mV on RF
V.T.V.M. If the differential level is above 50 mV and /or level is below 450 mV, repeat steps 3 and 4 as
necessary to obtain maximum output.
6
Re-connect R95 (or remove shorting capacitor). (Figure 5).
7
Connect Dummy Load and
Frequency Counter through
Coupler to RF Power Meter.
Connect RF Power Meter to
EXT. ANT. Jack on Set.
(Figure 6).
L5
Alignment of Driver
and Final Stage
L4
8
Adjust for maximum
indication on RF Power
Meter.
L3
9
10
Repeat steps 7 through 9 as necessary to obtain maximum output.
11
Adjust the core of L5 up (1/4 turn).
12
Connect Dummy Load and Frequency
Counter through Coupler to RF Power
Meter. Connect RF Power Meter to
EXT. ANT. Jack on Set. (Figure 6).
Check that RF output power is
3.7 to 4.3W on all channels with
no modulation. 
If it is not within
the above range, go back to steps 3
through 10 and readjust. 
If still
improper, change R95 value
(0-15 ohms).
13
Audio Generator (1 kHz)
across C115 or to Microphone
Connector, pin 4. (Figure 7)
Adjust audio signal level to
obtain 80-100% modulation
level.
Connect Dummy Load and
Oscilloscope through Coupler to
RF Meter. Connect RF Meter to
EXT. ANT. Jack on Set.
(Figure 7).
Check scope pattern for proper
modulation.
14
Connect Dummy Load and Field
Strength Meter through Coupler
to RF Power Meter. Connect RF
Power Meter to EXT. ANT. Jack
on set. (Figure 8)
Tune to 2nd harmonic Frequency
(54.35 MHz) on Field Strength Meter.
or
Connect Spectrum Analyzer and
RF Attenuator through RF Power
Meter to EXT. ANT. Jack on Set.
(Figure 9)
Check level of fundamental and 2nd
harmonic frequency (54.35 MHz).
Check suppression of 2nd harmonic
frequency (54.35 MHz) compared to
fundamental (must be better than
—63 dB).
Check all Channels and if necessary,
make sure that is more than —63 dB
on all channels with no modulation.
If it is NG, adjust L2 and L1
(stretch or squeeze).
15
Same as step 12.
Adjustment of Transmitter Frequency
Make sure that the transmitter
frequency is 27.175 MHz ± 600 Hz
indication on Frequency Counter.
Change crystal.
16
Same as step 12.
VR5
Alignment of
L 
RF Meter
Adjust so fourth LED lights
at 3.5 watts of RF output
power.

0
RF Power Meter Dummy Load
RF Power Meter
Spectrum Analyzer
63dB
00
RF ATT
b
(-40 dB)
SET
Antenna
Jack
DC
Power Supply 
2nd Harmonic
Fundamental
Figure 9
SET
Antenna
Jack
DC
Power Supply
da
o
10
Figure 8
Coupler
Field Strength
Meter
000OO
2. General Alignment Conditions
1.
Signal input must be kept as low as possible, to avoid overload and
clipping. (Use highest possible sensitivity of output indicator.)
2.
Standard modulation is 1000 Hz at 30% amplitude.
3.
A non-metallic alignment tool must be used for all adjustments.
4.
Power supply adjusted for 13.8 V DC, 2A.
NOTE: Figure 1 provides alignment location information.
3. Alignment Procedure
STEP
SIGNAL SOURCE
CONNECTION
OUTPUT INDICATOR
CONNECTION
SET SIGNAL
ADJUST
ADJUST FOR
1
Set Channel Selector to Channel 18.
2
Turn VR-2 (SQUELCH) fully counterclockwise.
3
Turn VR-4 (VOLUME) fully clockwise.
4
Connect RF Signal
Generator (455 kHz,
30%) to base
of Q4 through 0.01
p F
Capacitor.
Connect V.T.V.M.
across EXT. Speaker
Jack with 8 Q Dummy
load. (Figure 10)
455 kHz, 1 kHz 30%
Modulation. Adjust the
output of RF Signal
Generator to a minimum
level, so the IF circuit
is not saturated.
T4
Alignment of
2nd IF
Adjust for maximum
output.
T5
5
6
Connect RF
Signal
Generator to
Antenna
Connector.
Connect V.T.V.M. and
Distortion Meter across
Ext. Speaker Jack with
8 Q Dummy load.
(Figure 11)
27.175 MHz
1 kHz, 30%
Mod.
T1
Overall Adjustment
Adjust for maximum
indication on V.T.V.M.
Reduce output from
RF SG so that audio
output remains about
500 mW (2 V).
T2
7
T3
8
T4
9
10
Repeat steps 6 through 9 as necessary to obtain maximum output.
11
Same as
step 6
Same as
step 6.
27.175 MHz 1 kHz,
80% Mod. Set
Output of RF SG to
1 mV.
T5
Alignment of T5
Adjust for minimum
indication on Distortion
Meter.
12
Same as
step 6
Same as
step 6.
27.175 MHz 1 kHz, 30%
Mod. Set output of RF
SG to 0.316
pV.
R21
Adjustment of IF Gain
Confirm 2V indication
on V.T.V.M.
If not 2V, change value
of R21 (330-1K)
13
Same as
step 6
Same as
step 6.
27.175 MHz 1 kHz,
30% Mod. Set Output
of RF SG to 1 mV.
VR3
Adjustment of
SQUELCH
Turn VR-2 (SQUELCH)
fully clockwise. Adjust
output "on".
14
Same as
step 6
Same as
step 6.
27.175 MHz 1 kHz,
30% Mod. Set Output
of RF SG to 50
pV.
VR4 Adjustment of LED
S-Meter
Adjust so fourth LED
on S/RF Meter lights.
C. RECEIVER SECTION
1. Test Equipment Required
a.
RF Signal Generator
b.
V.T.V.M.
c.
Distortion Meter

Figure 10
8 ohm Dummy Load
Figure 11
8 ohm Dummy Load
RF SIG. GEN.
(27.175MHz)
SET
V.T.V.M. 
Distortion Meter
Antenna EXT.
Jack

SP.
Jack
1
RF SIG.GEN
(455 kHz )
Base of Q4
4. FREQUENCIES GENERATED AND MIXED TO
OBTAIN EACH CHANNEL
RECEIVE
*VCO FREQUENCY = ((N/2048) x (REFERENCE FREQUENCY (10.240 MHz))
TRANSMIT
*VCO FREQUENCY = ((N/2048) x (REFERENCE FREQUENCY (10.240 MHz))
*TRANSMIT FREQUENCY = VCO FREQUENCY + (REFERENCE FREQUENCY (10.240 MHz))
CHANNEL
NUMBERS
BCD INPUT TO
IC-1
RECEIVE
TRANSMIT
IC-1
PIN NUMBERS
8765  4 3 2 1
N
VCO
FREQUENCY
(MHz)
N
VCO
FREQUENCY
(MHz)
TRANSMIT
FREQUENCY
(MHz)
1
0 0 0 0
0 0 0 1
3254 16.270
3345 16.725 26.965
2
0 0 0 0
0 0 1 0
3256
16.280 3347
16.735
26.975
3
0 0 0 0
0 0 1 1
3258
16.290 3347
16.745 26.985
4
0 0 0 0
0 1 0 0
3262
16.310
3353
16.765 27.005
5
0 0 0 0
0 1 0 1
3264 16.320
3355
16.775
27.015
6
0 0 0 0
0 1 1 0
3265
16.330 3357
16.785 27.025
7
0 0 0 0
0 1 1 1
3268
16.340
3359
16.795 27.035
8
0 0 0 0
1 0 0 0
3272
16.360
3363
16.815 27.055
9
0 0 0 0
1 0 0 1
3274
16.370
3365
16.825 27.065
10
0 0 0 1
0 0 0 0
3276
16.380 3367
16.835 27.075
11
0 0 0 1
0 0 0 1
3278
16.390
3369
16.845 27.085
12
0 0 0 1
0 0 1 0
3282 16.410
3373
16.865 27.015
13
0 0 0 1 0 0 1 1
3284 16.420
3375
16.875
27.115
14
0 0 0 1
0 1 0 0
3286
16.430 3377
16.885 27.125
15
0 0 0 1
0 1 0 1
3288
16.440
3379
16.895 27.135
16
0 0 0 1 0 1 1 0
3292 16.460 3383
16.915
27.155
17
0 0 0 1
0 1 1 1
3294
16.470
3385
16.925 27.165
18
0 0 0 1
1 0 0 0
3296
16.480 3387
16.935
27.175
19
0 0 0 1 1 0 0 1
3293
16.490
3389
16.945 27.185
20
0 0 1 0
0 0 0 0
3302
16.510
3393
16.965
27.205
21
0 0 1 0 0 0 0 1
3304
16.520
3355
16.975
27.215
22
0 0 1 0
0 0 1 0
3306
16.530
3397 16.985
27.225
23
0 0 1 0 0 0 1 1
3312
16.560
3403
17.015
27.255
24
0 0 1 0 0 1 0 0
3308
16.540
3399
16.995
27.235
25
0 0 1 0
0 1 0 1
3310
16.550
3401
17.005
27.245
26
0 0 1 0 0 1 1 0
3314 16.570
3405
17.025
27.265
27
0 0 1 0
0 1 1 1
3316
16.580
3407 17.035
27.275
28
0 0 1 0 1 0 0 0
3318
16.590
3409
17.045
27.285
29
0 0 1 0
1 0 0 1
3320
16.600
3411 17.055
27.295
30
0 0 1 1 0 0 0 0
3322 16.610
3413
17.065
27.305
31
0 0 1 1
0 0 0 1
3324
16.620
3415
17.075
27.315
32
0 0 1 1 0 0 1 0
3326 16.630
3417 17.085
27.325
33
0 0 1 1
0 0 1 1
3328
16.640
3419
17.095
27.335
34
0 0 1 1
0 1 0 0
3330
16.650
3421
17.105
27.345
35
0 0 1 1
0 1 0 1
3332
16.660
3423
17.115
27.355
36
0 0 1 1 0 1 1 0
3334
16.670
3425
17.125
27.365
37
0 0 1 1 0 1 1 1
3336
16.680
3427 17.135
' 
27.375
38
0 0 1 1 1 0 0 0
3338
16.690
3429
17.145
27.385
39
0 0 1 1 1 0 0 1
3340
16.700
3431 17.155
27.395
40
0000 0000
3342 16.710
3433
17.165
27.405

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5. TRANSISTOR LEAD IDENTIFICATION AND
IC INTERNAL CONNECTION
IC-2 TA7310P
IC-LC7131
20 
11
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1 
10
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0
LC7131

7 6
VOLTAGE
REGU—
LATOR
IC-3 NJM4558D

IC-4 MB3712
8
IC-5 TL-489
ANALOG  DIGITAL OUTPUTS
INPUT
A 
Vcc 
Q5  Q4
GND 
0 I 
02 
03
DIGITAL OUTPUTS

6. TROUBLESHOOTING
SYMPTOM
'
CAUSE/REMEDY
A) UNIT WILL NOT
TURN ON.
1.
Defective power switch S3: Replace.
2.
Fuse blown: Replace.
3.
Broken DC power cable: Replace.
4.
Poor solder connection or other open connection in circuit:
Repair or replace.
5.
Defective IC-1: Replace.
B) NO RECEIVE
SOUND.
1.
Defective external Speaker jack: Repair or replace.
2.
Poor contact on microphone connector: Repair as required.
3.
Defective push switch on microphone: Repair or replace MIC.
4.
Defective internal Speaker: Replace Speaker.
5.
Defective D4, VR3, VR2, IC-3 or semiconductor in RX circuit:
Replace the defective component(s).
6.
Defective VR-1: Replace.
C) NO NOISE
1.
Defective Q7: Replace.
2.
Measure transistor & IC voltages in all audio states and receiver
section. Compare with voltages noted on the IC Et TRANSISTOR
VOLTAGE CHART.
3.
Improper local oscillator adjustment: Readjust.
4.
Defective SQUELCH Circuit (IC-3, VR2, VR3): Replace the
defective component(s).
D) NO TRANSMISSION
1.
Defective microphone: Repair or replace microphone.
2.
Defective push switch on microphone: Repair or replace.
3.
Improper adjustment of carrier oscillator or local
oscillator: Readjust.
4.
If you have checked all channels and obtain no RF output, check
V.C.O. and/or signal trace through transmitter circuit.
5.
Defective Antenna connector: Repair or replace.
6.
Defective L1: Repair or replace.
7.
Defective Q14 (E-C short): Replace.
E) NO MODULATION
1.
Defective microphone: Repair or replace microphone.
2.
Poor audio output/Defective modulator: Repair or replace
defective component(s).
3.
Inoperative microphone amplifier (Q13, IC-4): Replace
component(s).
4.
Defective microphone connector: Repair or replace.
5.
Defective AMC circuit (Q11, D7, Q12): Replace component(s).
F) NO SQUELCH
1.
Defective Q7, IC-3 circuit: Replace component(s).
2.
Improper adjustment of VR-3: Readjust.
G) LED METER DOES NOT
OPERATE BUT CB
OPERATES NORMALLY
1.
Defective LED (D11-1 - D11-5): Replace.
2.
Defective IC-5: Replace.
3.
Defective D3, VR-5: Replace.
H) MODULATION
INDICATOR
DOES NOT LIGHT
1.
Defective D15, Q10: Replace.
2.
Check Modulation: Refer E) NO MODULATION.

7. TRANSISTOR AND IC VOLTAGE CHART
TRANSISTOR VOLTAGE CHART
TRANSISTOR
NUMBER
EMITTER
(SOURCE)
COLLECTOR
(DRAIN)
BASE
(GATE)
RECEIVE
TRANSMIT
RECEIVE
TRANSMIT
RECEIVE
TRANSMIT
Q1 2.0
1.3
2.0 1.3
8.0
0.6
Q2 0.7
0
7.5
0
1.1
0.4
Q3
0.5
0
8.1
0
1.2
0.4
Q4
0.7
0
6.4 0
1.1
0.4
Q5
0.8
0
9.0
0
1.4
0.4
Q6 1.5
0
8.1
0
2.1
0
Q7
0
0
7.9 0.5 0.5
0
Q8
0.1
0
0.1
0.4
0.5
0.5
Q9
8.1
8.0
0.5
0.5
0
0
Q10 2.8
11.6
0
0
13.0
11.0
Q11 3.6
3.6
0.7
0
4.3
4.3
Q12 0
0 0
0
0.7
0
Q13 0.6
0.6
3.5
3.3
1.2
1.2
Q14 13.7
13.5
1.2 13.5
13.3
12.8
Q15
9.4
2.4
13.7 13.8
3.5
2.6
Q16 0
0
13.3
13.8
0 0
Q17
-0.3
0
13.3
13.8
0 0
NOTE: All voltage values are indicated in volts with no signal measured with V.T.V.M. PLL in
locked condition. Channel is 19.
IC VOLTAGE CHART
IC-1
LC7131
PIN NO.
1
2
3
4 5
6
7
8
9 10
RECEIVE
TRANSMIT
6.4
6.4
0
0
0
0
6.4
6.4
0
6.4
0
0
0
0
0
0
0
0 0 0
PIN NO.
11
12
13
14 15
16
17
18
19
20
RECEIVE
TRANSMIT
3.2
3.2
3.1
3.1
0
0
2.0
1.4
1.5
1.4
1.5
0
3.5
5.1
6.4
6.4
2.8
2.8
6.3
0.7
IC-2
KIA7310
PIN NO.
1
2
3
4
5
6
7
8
9
RECEIVE
TRANSMIT
2.6
2.5
1.9
1.9
1.2
1.3
1.6
2.4
0
0
1.2
13.2
2.0
1.9
7.2
8.2
1.2
13.2
IC-3
NJM4558
Squelch (on/off)
PIN NO.
1
2
3 4
5
6
7 8
RECEIVE
TRANSMIT
1.3/4.4
4.4
1.3/4.4
4.4
1.0/4.4
4.4
0/0
0
1.4/1.4
1.4
2.7/0
0
1.3/7.8
7.9
8.5/8.5
8.5
IC-4
MB3712HM
PIN NO.
1
2
3
4
5 6
7 8
RECEIVE
TRANSMIT
6.8
6.8
13.7
13.6
13.0
12.9
0
0 0
0
0
0
0.6
0.6
0.6
0.6
IC-5
TL489C
PIN NO.
1
2
3
4
5 6
7 8
RECEIVE
TRANSMIT

ON
( LED
RF/S METER OFF
0
0
0
12.3
0
1.5
12.3
0
12.1
12.2
0
12.1
12.3
0
12.1
12.2
12.1
12.1
13.7
13.6
13.5
0
0.9
0

8. PRINTED CIRCUIT BOARD (TOP VIEW)

9. PRINTED CIRCUIT BOARD (BOTTOM VIEW)

17 -

12. SCHEMATIC DIAGRAM

Q14 2SA733(P) or (Q) or

QI5 2SC1175(D)

Q16 2SC2086

Q17 2SC2166
2SA1015(0)
 or 2SC2314(E)or(F)

NOTE ( I ) 
ALL RESISTANCE VALUES ARE .
INDICATED IN "OHM" (K=10 3
OHM, M=10 6
OHM)
(2)
ALL CAPACITANCE VALUES ARE INDICATED IN ".uF " ( P=10
6 11F)
(3)
* MAY VARY FROM UNIT TO UNIT FOR BEST PERFORMANCE.

RADIO SHACK M A DIVISION OF TANDY CORPORATION
U.S.A.: FORT WORTH, TEXAS 76102
CANADA: BARRIE, ONTARIO L4M 4W5
TANDY CORPORATION
AUSTRALIA

BELGIUM 
U. K.
280-316 VICTORIA ROAD

PARC INDUSTRIEL DE NANINNE

BILSTON ROAD, WEDNESBURY
RYDALMERE, N.S.W. 2116

5140 NANINNE 
WEST MIDLANDS WS10 7JN
10A0

Printed in Japan