Aiwa NSX-HMT35, Руководство по обслуживанию

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ADJUSTMENT <TUNER / FRONT / DECK>
< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point : TP2(CLK)
Method : Set to AM 1710kHz and check that the test point is
2160kHz
±
45Hz.
2. AM VT Check
Settings : • Test point : TP1(VT)
Method : Set to AM 1710kHz and check that the test point is less
than 8.5V.
Then set to AM 530kHz and check that the test point is
more than 0.6V.
3. FM VT Adjustment
Settings : • Test point : TP1(VT)
• Adjustment location : L906
Method : Set to FM 108.0MHz and adjust L906 so that the test
point becomes 7.0V
±
0.1V.
Then set to FM 87.5MHz and check that the test point is
more than 0.4V.
4. AM Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location : L951(1/3)
Method : Set to AM 1000kHz and adjust L951(1/3) to maximum.
5. FM Tracking Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location : L903
Method : Set to FM 87.5MHz and adjust L903 so that the test
point is less than 9dB
µ
V.
6. AM IF Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L802 ............................................................ 450kHz.
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
TP8(Lch), TP9(Rch) (Distortion)
• Adjustment location : L801
• Input level : 60dB
µ
V
Method : Set to FM 98.0MHz and adjust L801 so that the
distortion becomes minimum. Next, check that the
voltage between TP3 and TP4 is 0V
±
500mV.
< FRONT SECTION >
8.
µ
-CON OSC Adjustment
Settings : • Test point : TP11(KEY-SCAN), (GND)
• Adjustment location : L951
Method : Connect a frequency counter across TP11(KEY-SCAN)
and GND. Insert AC plug while pressing TUNER / BAND
function key and POWER key. Then adjust L951 so that the
test point becomes 112.77Hz ~ 112.99Hz.
< DECK SECTION >
9. Tape Speed Adjustment (DECK 2)
Settings : • Test tape : TTA–100
• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 so that the
frequency counter reads 3000Hz
±
5Hz.
10. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : • Test tape : TTA–330
• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : 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 (DECK 1, DECK 2)
Settings : • Test tape : TTA–330
• Test point : TP8(Lch), TP9(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 within 5dB.
12. PB Sensitivity Check (DECK 1, DECK 2)
Settings : • Test tape : TTA–200
• Test point : TP8(Lch), TP9(Rch)
Method : Play back the test tape and check that the output level of
the test point is 110mV
±
3dB.
13. REC/PB Frequency Response Adjustment (DECK 2)
Settings : • Test tape : TTA–602
• Test point : TP8(Lch), TP9(Rch)
• Input signal : 1kHz / 8kHz (LINE IN)
• Adjustment location : SFR351 (Lch)
SFR352 (Rch)
Method : Apply a 1kHz signal and REC mode. Then adjust OSC
attenuator so that the output level at the TP8, TP9
becomes -20VU (10mV). Record and play back the
1kHz and 8kHz signals and adjust SFRs so that the
output of the 8kHz signals becomes 0dB
±
1dB with
respect to that of the 1kHz signal.
14. REC/PB Sensitivity Check (DECK 2)
Settings : • Test tape : TTA–602
• Test point : TP8(Lch), TP9(Rch)
• Input signal : 8kHz (LINE IN)
Method : Apply a 8kHz signal and REC mode. Then adjust OSC
attenuator so that the output level at TP8, TP9 becomes
0VU (100mV). Record and play back the 8kHz signal
and check that the output is -1dB
±
3.5dB.
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