Aiwa NSX-SZ705 Service Manual download pdf (Page 28)

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1. Tape Speed Adjustment (DECK 2)

Settings : • Test tape : TTA–100

• Test point : TP5 (Lch), TP6 (Rch)

• Adjustment location : SFR1

Method : Play back the test tape and adjust SFR1 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–300

• 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.

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. AM Tracking Adjustment

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

• Adjustment location : L951(1/3)

Method : Set to AM 1000kHz and adjust L951(1/3) so that the test

point becomes maximum.

4. 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.

5. FM Tracking Adjustment

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

• Adjustment location : L903

Method : Set to FM 87.5 MHz and adjust L903 so that the test

point is less than 9.0dBµV.

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 : 60dBµV

Method : Set to FM 98.0MHz and adjust L801 so that the voltage

between TP3 and TP4 becomes 0V±300mV.

Then check that the distortion is less than 1.2%

< TUNER SECTION >

ADJUSTMENT <TUNER / DECK / FRONT>

< DECK 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 10kHz

signal with respect to that of the 315Hz signal is

0dB ± 5dB.

4. REC/PB Frequency Response Adjustment (DECK 2)

Settings : • Test tape : TTA–602

• Test point : TP5(Lch), TP6(Rch)

• Adjustment location : SFR451(Lch)

SFR452(Rch)

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.

5. REC/PB Sensitivity Check (DECK 2)

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 80mV. Record and play back the 1kHz signals

and check that the output is –1dB ± 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 ± 3dB.

< 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 141.67Hz ± 0.14Hz.

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Aiwa NSX-SZ705 Service Manual Page 28

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