Aiwa NSX-SZ702, Service Manual

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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 3000 Hz ± 5 Hz (FWD) and

± 45 Hz (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 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 (DECK 1, DECK 2)

Settings : • Test tape : TTA–330

• Test point : TP5 (Lch), TP6 (Rch)

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

0 dB ± 5 dB.

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 1 kHz signal and REC mode. Then adjust

OSC attenuator so that the output level at the TP5,

TP6 becomes 10 mV. Record and play back the 1 kHz

and 8 kHz signal and adjust SFRs so that the output of

the 8 kHz signal is 0 dB ± 1 dB with respect to that of

the 1 kHz signal.

5. REC/PB Sensitivity Check (DECK 2)

Settings : • Test tape : TTA–602

• Test point : TP5 (Lch), TP6 (Rch)

• Input signal : 1 kHz (LINE IN)

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

OSC attenuator so that the output level at TP5, TP6

becomes 80 mV. Record and play back the 1 kHz

signals and check that the output is –1 dB ± 3.5 dB.

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 110 mV ± 3 dB.

< DECK  SECTION >

< FRONT  SECTION >

1. µ-CON OSC Adjustment

Settings : • Test point : TP7 (K-SCAN), 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 141.67 Hz ± 0.14 Hz.

17. FM Separation Check

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

• Input level: 60 dBµV

Method : Set to FM 98.0 MHz and check that the test point is

more than 12 dB <EZ>, more than 25 dB <EXCEPT

EZ>.