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ADJUSTMENTS
This set has been aligned at the factory and normally will not require further adjustment. As a result, it is not
recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers
with the adjustment, realignment may be necessary.
ADJUSTMENT & TEST POINT
Figure 1. Main P.C. Board
L140
(RECORD BIAS
ADJUSTMENT)
VR298
(MOTOR SPEED
ADJUSTMENT)
L21
(FM IF
ADJUSTMENT)
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TAPE DECK ADJUSTMENT
1. AZIMUTH ADJUSTMENT
Figure 3. Azimuth Adjustment Connection Diagram
2. MOTOR SPEED ADJUSTMENT
Figure 4. Motor Speed Adjustment Connection Diagram
TUNER ADJUSTMENT
Figure 2. Tuner(S curve) Adjustment Connection Diagram
CH1 CH2
Speaker
Terminal
Playback Mode
Head
Test Tape
MTT-114
L ch
R ch
GND
Dual-trace
synchroscope
Electronic
Voltmeter
L out
R out
Unit
Unit
26
,
28 PIN
Signal Generator
GND
Electronic
OSCILLOSCOPE
FM Antenna
Terminal
Head
Playback Mode
Unit
Speaker Terminal
GND
L out
R out
Record/Playback
Head
Test Tape
MTT-111
Frequency Counter
Deck Mode Test Tape Test Point Adjustment Adjust for Remark
Playback MTT-114
Speaker
Head Screw R/L Maximum
Forward:Righthand Side Screw
Terminal Reverse:Lefthand Side Screw
Item Test Point Adjustment Adjust for
DC Voltage IC102
, pin L21 0V 50mV
Deck Mode Test Tape Test Point Adjustment Adjust for Remark
Playback MTT-111
Speaker VR298
3kHz
45Hz
After adjusting in forward, confirm
Terminal (MAIN PWB) the specification in reverse mode.
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3. RECORD BIAS ADJUSTMENT
Figure 5. Record Bias Adjustment Connection Diagram
Deck Mode Test Tape Test Point Adjustment Adjust for
Rec/Pause MTT-5511 Erase Head Wire L140 86kHz±5kHz
CDP ADJUSTMENTS
When change the pick-up must be confirm as follow
1. TRACKING BALANCE CONFIRMATION
1) Connect the oscilloscope to TEO and REF.
2) Access from 1st selection to last section of test disc (YEDS-18)
3) Confirm the normal state of tracking error signal (T.B deviation : less than ±3%)
2. RF WAVEFORM CONFIRMATION
1) Connect the oscilloscope to RF and REF.
2) Put a test disc (SONY YEDS-18) into unit and playback the 18th selection of the test disc.
3) Confirm the normal state of RF waveform.
4) Confirm the less than 30nS of Jitter Meter reading.
OV(DC Mode) T.B deviation(%)
= X %
A
B
A=B
A+B
A-B
2
100
3T, 4T 5T,6T 11T
EYE-PATTERN EYE-PATTERN
OK NG
Test Tape
MTT-5511
Head
Record/Playback
Head
Record/Playback
and Pause Mode
Unit
Erase Head Wire
GND
Frequency Counter
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