Aiwa NSX-VC8, Service Manual

– 33 –

ADJUSTMENT  <TUNER / DECK / FRONT>

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, 530kHz and check that the test

point is less than 8.5V (1710kHz) and more than
0.6V (530kHz).

3. FM VT Adjustment

Settings : • Test point : TP1 (VT)

• Adjustment location : L907

Method : Set to FM 108.0MHz and adjust L907 so that the test

point is 7.0V 

±

 50mV.

4. AM Tracking Adjustment

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Adjustment location :
L951(1/3) ........................................ 999kHz

Method : Set to AM 1000kHz and adjust L951(1/3) to MAX.

5. FM Tracking Adjustment

Settings : • Test point :  TP5 (Lch), TP6 (Rch)

• Adjustment location : L904

Method : Set to FM 87.5MHz and adjust L904 so that the test

point is maximum.

6. AM IF Adjustment

Settings : • Test point : TP5 (Lch), TP6 (Rch)

• Adjustment location :
L802 ................................................ 450kHz

7. DC Balance / Mono Distortion Adjustment

Settings : • Test point :  TP3, TP4 (DC Balance)

                  : TP5 (Lch), TP6 (Rch) (Distortion)

• Adjustment location : L801
• Input level : 60dB

µ

V

Method :

Set to FM 98.0MHz and adjust L801 so that the
voltage between TP3 and TP4 is 0V 

±

 0.04V.

Then check the distortion is less than 1.3%

< DECK  SECTION >

1. Tape Speed Adjustment (DECK 1)

Settings : • Test tape : TTA–100

• Test point : TP5 (Lch), TP6 (Rch)
• Adjustment location : SFR501

Method : Play back the test tape and adjust SFR501 so that the

frequency counter reads 3000Hz 

±

 5Hz (FWD) and

±

 45Hz (REV) with respect to forward speed.

2. Head Azimuth Adjustment (DECK 1, DECK 2)

Settings : • Test tape : TTA–330

• Test point : TP5 (Lch), TP6 (Rch)
• 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.

< TUNER  SECTION >

3. PB Frequency Response Check (DECK 1, DECK 2)

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 

±

 4dB.

4. REC/PB Frequency Response Check (DECK 1)

Settings : • Test tape : TTA–602

• Test point : TP5 (Lch), TP6 (Rch)

Method : Apply a 1kHz signal and REC mode. Then adjust

OSC attenuator so that the output level at the TP5,
TP6 becomes 80mV. Record and play back the 1kHz
and 8kHz signal and check that the output of the 8kHz
signals is 0dB 

±

 5dB with respsct to that of the 1 kHz

signal.

5. REC/PB Sensitivity Check (DECK 1)

Settings : • Test tape : TTA–602

• Test point : TP5 (Lch), TP6 (Rch)
• Input signal : 1kHz (LINE IN)

Method : Apply a 1kHz signal and REC mode. Then adjust

OSC attenuator so that the output level at TP5, TP6
becomes 8mV. Record and play back the 1kHz signals
and check that the output is –2dB 

±

 3.5dB.

6. PB Sensitivity Check (DECK 1, Deck 2)

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 

±

 3.5dB.

< FRONT  SECTION >

1.

µ

-CON OSC Adjustment

Settings : • Test point : TP7 and TP8 (GND)

• Adjustment location : L501

Method : Insert AC plug while pressing TUNER function key.

Adjust L501 so that the frequency at the test point is
233.4Hz 

±

 0.23Hz.