AIWA HSRX490AH/D
Service Manual

ADJUSTMENT

A MAIN C.B

2

5
SFR 251

7
TP1(DET) TP3(FM IF) VR101 TP4(VT) VOLUME
L201
IC251
12

12 8
SFR 401

7
TP2(VCO)

L253 TC251

7

(GND)
TC202

1

PHONES

8

J101

L251 BAR ANT

5

3

4

6

2

<RADIO SECTION>

<TAPE PLAYER SECTION>

1. AM IF Adjustment 8. Tape Speed Adjustment L253 ....................................................................... 450kHz Settings : � Test tape : TTA�100 � Test point : Phones Jack (J101) 2. FM IF Adjustment � Adjustment location : SFR401 TC202 ............................................................... 10.70MHz � Volume : MAX � DSL : OFF 3. AM VT Check � Tape selector : Normal Settings : � Test point : TP4 (VT) Method : Play back the test tape and adjust SFR401 for Method : Set to AM 531kHz and check that the test 3015 ± 10Hz (FWD) and ± 45 (REV). point is 1.3V ± 0.3V. Then set to AM 1602 Then confirm WOW is less than 0.50%. kHz and check that the test point is less than 11V. 4. FM VT Adjustment Settings : � Test point : TP4 (VT) Method : Set to FM 87.5MHz and check that the test point voltage is 3.45V ± 0.55V. Then set to FM 108.0MHz and check that the test point voltage is less than 11V. 5. AM Tracking Adjustment L251 ....................................................................... 630kHz TC251 .................................................................. 1440kHz 6. FM Tracking Adjustment L201 .................................................................... 87.5MHz 7. FM VCO Adjustment Settings : � Adjustment location : SFR251 � Test point : TP2 (VCO) Method : Connect a frequency counter to pin 12 of IC251. Adjust SFR251 such that the frequency counter indicates 19kHz ± 100Hz.

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