Aiwa XR-M100 Service Manual page 38

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< TUNER SECTION >(HR,HT)
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1. Clock Frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to AM 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. AM VT Check
Settings : • Test point : TP1(VT)
Method : Set to AM 1602kHz and check that the test point is
less than 8.0V. Then set to AM 531kHz and check
that the test point is more than 0.6V.
3. AM Tracking Adjustment
Settings : • Test point : TP6(Lch), TP7(Rch)
• Adjustment location :
L981(1/3) ........................................ 999kHz
Method : Adjust L981 (1/3) so that the output becomes
maximum.
4. FM VT Check
Settings : • Test point : TP1 (VT)
Method : Set to FM 108.0MHz and check that the test point is
less than 8.0V.
Set to FM 87.5MHz and check that the test point is
more than 0.5V.
5. FM Tracking Check
Settings : • Test point : TP6(Lch), TP7(Rch)
Method : Set to FM 98.0MHz and check that the test point is
less than 9.0dBµV.
6. AM IF Adjustment
TE
L 13942296513
Settings : • Test point : TP6(Lch), TP7(Rch)
• Adjustment location :
L772 ................................................ 450kHz
Method : Adjust L772 so that the output becomes maximum.
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
TP6(Lch), TP7(Rch) (Distortion)
• Adjustment location : L771
• Input level : 60dBµV
Method : Set to FM 98.0MHz and adjust L771 so that the
voltage between TP3 and TP4 becomes 0V ± 0.04V.
Next, check that the distortion is less than 1.3%
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< DECK SECTION >
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1. Tape Speed Adjustment
Settings : • Test tape :
• Test point :
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 for
3000Hz ± 5Hz (FWD) and FWD PLAY
speed ± 45Hz (REV).
2. Head Azimuth Adjustment
Settings : • Test tape :
• Test point :
• Adjustment location : Head azimuth
Method : Play back the 8kHz signal of the test tape and
adjust screw so that the output becomes
maximum. Next, perform on each FWD PLAY
and REV PLAY mode.
3. PB Frequency Response Check
Settings : • Test tape :
• Test point :
Method : Play back the 315Hz and 10kHz signals of
the test tape and check that the 10kHz signal
with respect to that of the 315Hz signal is
0dB ± 3dB.
4. REC/PB Frequency Response Check
Settings : • Test tape :
• Test point :
Method : Input a –20VU signal to the AUX terminal.
Record the 1kHz and 10kHz signals on the
test tape and play back them. Check that the
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difference between the record level and the
play back level at 1kHz and 10kHz signal is
0dB to ± 3dB.
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TTA–100
SP–OUT 2V
TTA–300
SP–OUT 2V
adjustment screw
TTA–320
SP–OUT 2V
TTA–602
SP–OUT 2V
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