Aiwa XS–G6 Service Manual page 19

ADJUSTMENT <TUNER / DECK / FRONT>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to MW 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. MW VT Check
Settings : • Test point : TP1 (VT)
Method : Set to MW 1602kHz and check that the test point is less
than 8.0V. Then set to MW 531kHz and check that the
test point is more than 0.6V.
3. MW Tracking Adjustment
Settings : • Test point : TP5 (Lch), TP6 (Rch)
• Adjustment location : L951 (1/3)
Method : Set to MW 999kHz and adjust L951 (1/3) so that the test
point becomes maximum.
4. LW VT Adjustment
Settings: • Test point :TP1 (VT)
• Adjustment location : L942
Method : Set to LW 144kHz and adjust L942 so that the test point
becomes 1.3V ± 0.05V.
Then set to LW 290kHz and check that the test point is
less than 8.0V.
5. LW Tracking Adjustment
Settings : • Test point :TP5 (Lch), TP6 (Rch)
• Adjustment location :
L941................................144kHz
TC942..............................290kHz
Method: Set up TC942 to center before adjustment. The level at
144kHz is adjusted to maximum by L941. Then the level
at 290kHz is adjusted to maximum by TC942.
6. 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. Then set to FM 87.5MHz and check that
the test point is more than 0.5V.
7. FM Tracking Check
Settings : • Test point : TP5 (Lch), TP6 (Rch)
Method : Set to FM 98.0MHz and check that the test point is less
than 13.0dBµV.
8. AM IF Adjustment
Settings : • Test point : TP5 (Lch), TP6 (Rch)
• Adjustment location :
L802..............................450kHz
9. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
: TP5 (Lch), TP6 (Rch) (Distortion)
• Adjustment location : L801
• Input level : 60dBµV
Method : Set to FM 98.0MHz and adjust L801 so that the voltage
between TP3 and TP4 becomes 0V ± 500mV.
Then check that the distortion is less than 1.2%.
< DECK SECTION >
1. Tape Speed Check
Settings : • Test tape : TTA–100
• Test point : TP5 (Lch), TP6 (Rch)
Method : Play back the test tape and check that the frequency
counter reads 3000Hz ± 5Hz (FWD) and ± 45Hz (REV)
with respect to forward speed.
2. Head Azimuth Adjustment
Settings : • Test tape : TTA–330
• Test point : TP5 (Lch), TP6 (Rch)
• Adjustment location : Head azimuth
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.
3. PB Frequency Response Check
Settings : • Test tape : TTA–330
• Test point : TP5 (Lch), TP6 (Rch)
Method : Play back the 315Hz and 8kHz signals of the test
tape and check that the output ratio of the 8kHz
signal with respect to that of the 315Hz signal is
0dB ± 3dB.
4. PB Sensitivity Check
Settings : • Test tape : TTA–200
• Test point :TP5 (Lch), TP6 (Rch)
Method : Play back the test tape and check that the output level of
the test point is 110mV ± 30mV.
5. REC/PB Frequency Response Adjustment
Settings : • Test tape : TTA–602
• Test point : TP5 (Lch), TP6 (Rch)
• Adjustment location : SFR 451,SFR452
• Input signal : 8kHz/1kHz (LINE IN)(-20VU)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP5,
TP6 becomes 10mV. Record and play back the 1kHz
and 8kHz signal and adjust SFRs so that the output of
the 8kHz signals is 0dB ± 1dB with respect to that of the
1kHz signal.
6. REC/PB Sensitivity Check
Settings : • Test tape : TTA–602
• Test point : TP5 (Lch), TP6 (Rch)
• Input signal : 1kHz (LINE IN)(0VU)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at TP5, TP6
becomes 100mV. Record and play back the 1kHz
signals and check that the output is –1dB ± 3.5dB.
< FRONT SECTION >
1. µ-CON OSC Adjustment
Settings : • Test point : TP7 (K-SCAN) and TP8 (GND)
• Adjustment location : L151
Method : Insert AC plug while pressing TUNER function key and
POWER key. Adjust L151 so that the frequency at the
test point is 97.28Hz ± 0.10Hz.
– 19 –
adjustment screw