Aiwa XR-M171 Service Manual page 31

ADJUSTMENT <TUNER / DECK>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point :
Method : Set to AM 1710 kHz and check that the test point is
2160 kHz ± 45 Hz.
2. AM VT Check
Settings : • Test point :
Method : Set to AM 1710 kHz and check that the test point is less
than 8.5 V. Then set to AM 530 kHz and check that the
test point is more than 0.6 V.
3. AM Tracking Adjustment
Settings : • Test point :
• Adjustment location : L951(1/3)
Method : Set to AM 1000 kHz and adjust L951(1/3) so that the
test point becomes maximum.
4. AM IF Adjustment
Settings : • Test point :
• Adjustment location : L802
L802 ................................................... 450 kHz
5. FM VT Adjustment
Settings : • Test point :
• Adjustment location : L907
Method : Set to FM 108.0 MHz and adjust the L907 so that the
test point is 7.00 V ± 0.05 V.
6. FM VT Check
Settings : • Test point :
Method : Set to FM 87.5 MHz check that the test point is more
than 0.5 V.
7. FM Tracking Adjustment
Settings : • Test point :
• Adjustment location: L904
Method : Set to FM 98.0 MHz and adjust L904 so that the test
point becomes maximum and distortion to minmum.
8. FM Tracking Check
Settings : • Test point :
Method : Set to FM 98.0 MHz and check that the test point
is less than 9 dBµV.
9. DC Balance / Mono Distortion Adjustment
Settings : • Test point :
• Adjustment location : L801
• Input level :
Method : Set to FM 98.0 MHz and adjust L801 so that the voltage
between TP3 and TP4 becomes 0 V ± 500 mV with
minimum distortion.
10. Output Level Check
<AM>
Settings : • Test point :
• Input level :
Method : Set to AM1000 kHz and check that the test point is
55 mV ± 3 dB.
<FM>
Settings : • Test point :
• Input level :
Method : Set to FM 98.0MHz and check that the test point is
270 mV ± 3 dB.
TP2 (CLK)
TP1 (VT)
TP8 (Rch), TP9 (Lch)
TP8 (Rch), TP9 (Lch)
TP1 (VT)
TP1 (VT)
TP8 (Rch), TP9 (Lch)
TP8 (Rch), TP9 (Lch)
TP3, TP4 (DC Balance)
TP8 (LCH), TP9 (RCH)
(Mono Distortion)
60 dBµV
TP8 (Rch), TP9 (Lch)
74 dBµV
TP8 (Rch), TP9 (Lch)
60 dBµV
11. FM Separation Check
Settings : • Test point :
• Input level :
Method : Set to FM 98.0 MHz and check that the separation
more than 25 dB.
< DECK SECTION >
1. Tape Speed Check
Settings : • Test tape :
• Test point :
Method : Play back the test tape and check the test point is
3000 Hz ± 5 Hz (FWD) and FWD speed ± 45 Hz (REV).
2. Head Azimuth Adjustment
Settings : • Test tape :
• Test point :
• Adjustment location : Head azimuth
Method : Play back (FWD) the 8 kHz signal of the test tape and
adjust screw so that the output becomes maximum.
Next, perform on REV PLAY mode.
3. PB Frequency Response Check
Settings : • Test tape :
• Test point :
Method : Play back the 315 Hz and 10 kHz signals of the test
tape and check that the output ratio of the 10 kHz
signal with respect to that of the 315 Hz signal is
-3 dB ± 3 dB.
4. REC/PB Frequency Response Check
Settings : • Test tape :
• Test point :
• Input signal :
Method : Apply a 1 kHz signal and REC mode. Record and
play back the 1 kHz signals and check that the output
is -2 dB ± 3 dB.
– 31 –
TP8 (Rch), TP9 (Lch)
60 dBµV
TTA–100
SP OUT
TTA–330
SP OUT
adjustment screw
TTA–320
SP OUT
TTA–602
SP OUT
8 kHz/1 kHz (-20 VU / 0dB)