– 49 –
ADJUSTMENT (TUNER / DECK)
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point :
TP3 (CLK)
Method : Set to AM 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. AM VT Check
Settings : • Test point :
TP4 (VT)
Method : Set to AM 1602kHz and check that the test point is
less than 8.5V. Then set to AM 531kHz and check that
the test point is more than 0.3V.
3. AM Tracking Adjustment
Settings : • Test point :
TP8 (RCH)
TP9 (GND)
TP10 (LCH)
• Adjustment location : L981 (1/3)
Method : Set to AM 999kHz and adjust L981(1/3) so that the
test point becomes maximum.
4. AM IF Adjustment
Settings : • Test point :
TP8 (RCH)
TP9 (GND)
TP10 (LCH)
• Adjustment location :
L772 .................................................... 450kHz
5. FM VT Check
Settings : • Test point :
TP4 (VT)
Method : Set to FM 108.0MHz (87.5MHz) and check that the
test point is less than 8.0V (108.0MHz) and more than
0.5V (87.5MHz).
6. FM Tracking Check
Settings : • Test point :
TP8 (RCH)
TP9 (GND)
TP10 (LCH)
Method : Set to FM 98.0MHz and check that the test point is
less than 8dBuV.
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point :
TP5 (DC), TP6 (DC)
• Adjustment location : L771
• Input level :
60dBuV
Method : Set to FM 98.0MHz and adjust L771 so that the
voltage between TP5 and TP6 becomes 0V ± 0.04V.
Next, check that the distortion is less than 1.0%.
Method : Set to FM 98.0MHz and check that the test point is
< DECK SECTION >
9. Tape Speed Adjustment
Settings : • Test tape :
TTA–100
• Test point :
J602 (3/3) LINE OUT
• Adjustment location : SFR1
Method : Play back the 3kHz signal of the test tape and adjust
SFR1 for 3000Hz ± 5Hz (FWD) and FWD PLAY
speed ± 45Hz (REV).
10. Head Azimuth Adjustment
Settings : • Test tape :
TTA–300
• Test point :
J602 (3/3) LINE OUT
• Adjustment location : Head azimuth
adjustment screw
Method : Play back (FWD) the 8kHz signal of the test tape and
adjust screw so that the output becomes maximum.
Next, perform on REV PLAY mode.
11. PB Frequency Response Check
Settings : • Test tape :
TTA–320
• Test point :
J602 (3/3) LINE OUT
Method : Play back the 315Hz and 10kHz signals of the test
tape and check that the output ratio of the 10kHz
signal with respect to that of the 315Hz signal is
–3dB ± 3dB.
12. REC/PB Frequency Response Check
Settings : • Test tape :
TTA–602
• Test point :
J602 (3/3) LINE OUT
Method : Input a –20VU (0dB) signal to the AUX terminal.
Record the 1kHz and 8kHz signals on the test tape and
play back them. Check that the difference between the
record level and the play back level at 1kHz and 8kHz
signal is –2dB to ± 3dB.
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