AIWA NSX-SZ42EZ
Manual de Servicio

ADJUSTMENT
< TUNER SECTION > 1. Clock frequency Check Settings : � Test point : TP2
TC942 L802 14 SFR451 SFR452 L801 IC801 TP4 (DC BALANCE) TP3 (DC BALANCE) L951 TP2 (CLK) TP8 (RCH) GND TP9 (LCH) TP1 (VT) FFE831 L942 (3/3) (1/3) 3 2 3 4 5 L941 6

MAIN C.B

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< DECK SECTION > 10. 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 and ±45Hz (REV) with respect to forward speed. 11. Head Azimuth Adjustment (DECK 1, DECK 2) Settings : � Test tape : TTA�330 � Test point : TP8(Lch), TP9(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. 12. PB Frequency Response Check (DECK 1, DECK 2) Settings : � Test tape : TTA�300 � 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. 13. 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 140mV ± 3dB. 14. 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 : SFR451 (Lch) SFR452 (Rch) Method : Apply a 1kHz signal and REC mode. Then adjust OSC attenuator so that the output level at the TP8, TP9 becomes -20VU. Record and play back the 1kHz and 8kHz signals and adjust SFRs so that the output of the 8kHz signals becomes 0dB ± 0.5dB with respect to that of the 1kHz signal. 15. REC/PB Sensitivity Check (DECK 2) Settings : � Test tape : TTA�602 � Test point : TP8(Lch), TP9(Rch) � Input signal : 1kHz (LINE IN) Method : Apply a 1kHz signal and REC mode. Then adjust OSC attenuator so that the output level at TP8, TP9 becomes 0VU. Record and play back the 1kHz signals and check that the output is �2dB ± 3.0dB. < FRONT SECTION > 16. µ-CON OSC Adjustment Settings : � Test point : TP7 and GND � Adjustment location : L331 Method : Insert AC plug while pressing POWER and TUNER function keys. Adjust L331 so that the frequency atthe test point is 153.84Hz ± 0.15Hz.

Method : Set to AM 1602kHz and check that the test point is 2052kHz ± 45Hz. 2. MW VT Check Settings : � Test point : TP1 (VT) Method : Set to MW 1602kHz, 531kHz and check that the test point is less than 8.0V (1602kHz) and more than 0.6V (531kHz). 3. LW VT Adjustment Settings : � Test point : TP1 (VT) � Adjustment location: L942 Method : Set to LW 144kHz and adjust L942 so that the test point is 1.3V ± 0.05V. Then set to LW 290kHz and check that the test point is less than 8.0V. 4. FM VT Check Settings : � Test point : TP1 (VT) Method : Set to FM 87.5MHz, 108.0MHz and check that the test point is more than 0.5V (87.5MHz) and less than 8.0V (108.0MHz). 5. MW Tracking Adjustment Settings : � Test point : TP8(Lch), TP9(Rch) � Adjustment location : L951(1/3) ...................................... 999kHz Method : Set to MW 999kHz and adjust L951(1/3) so that the level at the test point becomes maximum. 6. LW Tracking Adjustment Settings : � Test point : TP8(Lch), TP9(Rch) � Adjustment location : L941, TC942 Method : Set up TC943 to center position. Set to LW 144kHz and adjust L941 so that the level at test point becomes maximum. Then set to LW 290kHz and adjust TC942 so that the level at test point becomes maximum.

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DECK-2 R/P HEAD

DECK-1 P HEAD

DECK C.B
SFR1

11

11

10

R268

11 REV

11 FWD

FWD

REV
16

FRONT C.B

FL401

TP7

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IC201 L331

7. FM Tracking Check Settings : � Test point : TP8(Lch), TP9(Rch) Method : Set to FM 98.0MHz and check that the test point is less than 13dBµV.
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GND

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C326

8. AM IF Adjustment Settings : � Test point : TP8(Lch), TP9(Rch) � Adjustment location : L802 ............................................. 999kHz 9. DC Balance / Mono Distortion Adjustment Settings : � Test point : TP3, TP4 (DC Balance) : TP8(Lch), TP9(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 ± 0.3V. Next, check that the distortion is less than 1.3%.

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