Aiwa NSX-D77 User Manual download pdf (Page 40)

1. Clock Frequency Check

Settings : • Test point : TP6 (CLK)

Method : Set to AM 1710kHz<U,LH>, 1602kHz<HS>

and check that the test point is 2160kHz ± 45Hz

<U,LH>, 2052kHz ± 45Hz<HS> .

2. AM VT Check

Settings : • Test point : TP3 (VT)

Method : Set to AM 1710kHz<U,LH>, 1602kHz<HS>

and AM 530kHz<U,LH>, 531kHz<HS> and

check that the test point is less than 8.5V

(1710kHz)<U,LH>, 8.0V(1692kHz)<HS>

and more than 0.6V(530kHz,531kHz)

3. AM Tracking Adjustment

Settings : • Test point : TP7(Lch), TP8(Rch)

• Adjustment location :

L951(1/3)........................ 999kHz

Method : Set to AM 999kHz and adjust

L951(1/3) so that the test point is max.

4. FM VT Check

Settings : • Test point : TP3 (VT)

Method : Set to FM 108.0MHz and check that the test

point is less than 8.0V.

Set to FM 87.5MHz and check that the test

point is more than 0.5V.

5. FM Tracking Check

Settings : • Test point : TP7(Lch), TP8(Rch)

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

is less than 9.0dBµV<U,LH>, 13dBµV<HS>.

6. AM IF Adjustment

Settings : • Test point : TP7(Lch), TP8(Rch)

• Adjustment location : L802

• Input level : Variable

Method : Adjust L802 so that the output becomes max.

7. DC Balance / Mono Distortion Adjustment

Settings : • Test point : TP4, TP5

(DC Balance)

TP7(Lch), TP8(Rch)

(Distortion)

• Adjustment location : L801

• Input level : 60dBµV

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

voltage between TP4 and TP5 becomes 0V ±

0.04V.

Next, check that the distortion is less than 1.3%

< DECK SECTION >

8. Tape Speed Adjustment (DECK 1, DECK 2)

Settings : • Test tape : TTA–100(3kHz)

• Test point : TP9(Rch), TP10(Lch)

• 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.

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

Settings : • Test tape : TTA–300 (315/10kHz)

• Test point : TP9(Rch), TP10(Lch)

• Adjustment location : Head azimuth

adjustment screw

Method : Play back the 10kHz signal of the test tape

and adjust screw so that the output becomes

maximum. Next, perform on each FWD PLAY

and REV PLAY mode.

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

Settings : • Test tape : TTA–300 (315/10kHz)

• Test point : TP9(Rch), TP10(Lch)

Method : Play back the 315Hz and 10kHz signals of the

test tape and check that the output ratio of the

10kHz signal with respect to that of the 315Hz

signal is within 0 ± 2dB.

11. PB Sensitivity Adjustment (DECK 1, DECK 2)

Settings : • Test tape : TTA–200 (400Hz)

• Test point : TP9(Rch), TP10(Lch)

• Adjustment location :

SFR301 (DECK 1, Lch)

SFR302 (DECK 1, Rch)

SFR303 (DECK 2, Lch)

SFR304 (DECK 2, Rch)

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

output level of the test points become

245mV±10mV.

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

Settings : • Test tape : TTA–602 (Normal)

• Test point : TP9(Rch), TP10(Lch)

• Input signal : 1kHz / 10kHz (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 test

points becomes 12.5mV. Record and play back the

1kHz and 10kHz signals and adjust SFRs so that the

output level of the 10kHz signals becomes 0dB ±

0.5dB with respect to that of the 1kHz signal.

13. REC/PB Frequency response Check (DECK 2)

Settings : • Test tape : TTA-615 (CrO

)

• Test point : TP9(Rch), TP10(Lch)

• Input signal : 1kHz/10kHz (LINE IN)

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

Adjust OSC attenuator so that the output level

at the test points becomes 12.5mV. Record and

play back the 1kHz and 10kHz signals and

check that the output is 0dB ± 2dB.

14. REC/PB Sensitivity Adjustment (DECK 2)

Settings : • Test tape : TTA–602 (Normal)

• Test point : TP9(Rch), TP10(Lch)

• Input signal : 1kHz (LINE IN)

• Adjustment location :

SFR305 (Lch)

SFR306 (Rch)

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

OSC attenuator so that the output level at the test

points becomes 125mV. Record the play back the

1kHz signal and adjust SFRs so that the output level

becomes 0dB ± 0.5dB.

< TUNER SECTION >

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Aiwa NSX-D77 User Manual Page 40

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