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SERVICE MANUAL
T- 1 D
AM/FM Stereo Tuner
CONTENTS
1 SPECIFICATIONS 2
2 ADJUSTMENTS AND CHECKS 3
3 EXPLODED VIEWS AND PARTS LIST 6
4 PC BOARDS AND PARTS LIST 8
NOTES
PC boards shown are viewed from parts side.
The parts with no reference number or no parts number in the
exploded views are not supplied.
As regards the resistors and capacitors, refer to the circuit diagrams
contained in this manual.
£ Parts marked with this sign are safety critical components. They
must be replaced with identical components - refer to the appropriate
parts list and ensure exact replacement.
Effective : December, 2002 S-0075A
1 SPECIFICATIONS
FM Tuner Section
(Without notes 98 MHz, 65 dBf)
Tuning Range: 87.5 MHz 108.0 MHz (50 kHz steps)
Usable Sensitivity (IHF):
Mono: 11.2 dBf
50 dB Quieting Sensitivity:
Mono: 15 dBf
Stereo: 20 dBf
Total Harmonic Distortion (1 kHz):
Mono: 0.4%
Stereo: 0.5%
Frequency Response: 30 Hz 15 kHz, +1/ 1.5 dB
Stereo Separation (1 kHz): 40 dB
Signal-to-Noise Ratio:
Mono: 72 dB
Stereo: 70 dB
AM Tuner Section
Tuning Range: 522 kHz 1,620 kHz (9 kHz steps)
Usable Sensitivity: 55 dB/m
Total Harmonic Distortion: 0.8% at 85 dB/m
Signal-to-Noise Ratio: 45 dB at 85 dB/m
General
Power Requirements: 230 V AC, 50 Hz
Power Consumption: 8 W
Dimensions (W x H x D): 435 x 102 x 270 mm
Weight (net): 3.6kg
Standard Accessories:
AM Loop Antenna x 1
FM Lead-type Antenna x 1
Power Control Cord x 1
Improvements may result in specifications and features
changing without notice.
2
2 ADJUSTMENTS AND CHECKS
ALIGNMENT INSTRUCTIONS
EQUIPMENT NEEDED:
AM Signal Generator
FM Signal Generator
Oscilloscope
VTVM(AC, DC)
Test loop antenna (AW Adjustment)
Dummy antenna (FM Adjustment)
Stereo signal modulator
Frequency counter
Distortion analyser
IMPORTANT
1. Check power-source voltage.
2. Set the function switch to band aligned.
3. Keep the signal input as low as possible to adjust accurately.
4. Modulation and modulation frequency.
Item
Modulation Modulation frequency
Band
AM 30% 400Hz
FM 100%(75KHz Dev.) 400Hz
ADJUSTMENT POINT
TVR3
T4 T3-2 T3-1
L2
TVC2 T1
TVR4
TVR2 TP1 T1
TVR1 RF1
TVC1
TVR5
T5 T2 P6
P5
MAIN PCB
3
1. AM TRACKING VOLTAGE ADJUSTMENTS
DC VOLTMETER ........................... CONNECT TO TEST POINT P5 and GND
NO. Band Frequency Adjust for Adjustment
1 AM 603KHz 2.2V T1
2 AM 1620KHz 9.0V TVC1
P5
GND
2. AM RF ADJUSTMENT
Signal Generator ........................ Connects to the AM ANT. Coil through the loop antenna.
Adjust for the indication of VTVM of the wave form of scope to be maximum.
BAND Step Frequency Adjust for Adjustment
1 630KHz Maximum sensitivity L2, T2
AM 2 1422KHz Maximum sensitivity TVC2
3 Repeat steps 1 and 2 several times.
3. FM 19kHz REJECTION ADJUSTMENT
NO. Frequency Adjust for Adjustment
1 97.8MHz L rejection T4
2 97.8MHz R rejection T5
3 97.8MHz L, R rejection TVR3
4
4. FM MONO DISTORTION ADJUSTMENT
DC VOLT METER ........................Connect to TP1(-), TP1(+) Through the choke coll (100 H)
Signal Generator........................Connect to FM ANT Jack (FM IN) through the dummy.
Distortion Meter .........................Connect to the output.
NO. Frequency Adjust for Adjustment
1 97.8MHz DC Voltmeter 0V T3-1
TP1(-)
TP1(+)
2 97.8MHz Minimum T.H.D T3-2
3 97.8MHz Minimum T.H.D T1
4 Repeat steps 1 and 2 Several times.
5. FM/AM AUTO STOP LEVEL ADJUSTMENT
FM SIGNAL GENERATOR ........................Connect to FM ANT Jack (FM IN) through the dummy
AM SIGNAL GENERATOR.........................Connect to AM ANT, Coil through the Loop antenna
BAND STEP SIGNAL GENERATOR Adjust for Adjustment
FM 1 97.8MHz 16dB TUNED Display ON TVR1
AM 1 630KHz 74dB TUNED Display ON TVR2
6. FM SEPARATION ADJUSTMENT
NO. Frequency Adjust for Adjustment
1 97.8MHz L separation TVR5
2 97.8MHz R separation TVR4
5
3 EXPLODED VIEWS AND PARTS LIST
a
p
d
t o
u
y
w
s
6
4
5 i
2
r
e
g
q
9
0
8
3
7
1
f
6
EXPLODED VIEW LIST
£
£
£
£
INCLUDED ACCESSORIES
7
4 PC BOARDS AND PARTS LIST
B4230/B4231 PCB
B3850 PCB B3852 PCB
8
KEY PCB ASSY TUNER PCB ASSY
£
£
£
£
B4231 PCB ASSY
TUNER PCB ASSY
£
£
£
£
£
£
9
POWER PCB ASSY
£
10
SCHEMATIC DIAGRAM T-1D
1 2 3 4 5 6 7 8
A
B
C
D
E
T- 1 D
AM/FM Stereo Tuner
1 st Issue; August 2002
SCHEMATIC DIAGRAM T-1D
1 2 3 4 5 6 7 8
A
B
C
D
E
T- 1 D
AM/FM Stereo Tuner
1 st Issue; August 2002