Aiwa HS-RXM2000AH, Руководство по обслуживанию

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– 6 –
ADJUSTMENT
<RADIO SECTION>
1. AM IF Adjustment
IFT451 ................................................................... 450 kHz
2. FM IF Adjustment
CT402 ..................................................................10.7 MHz
3. AM VT Check
Settings : • Test point : TP3 (VT)
Method : Set to AM 531 kHz and check that the test point
is 1.2 V ± 0.3 V. Then set to AM 1602 kHz and
1check that the test point is less than 7.8 V.
4. FM VT Check
Settings : • Test point : TP3 (VT)
Method : Set to FM 87.5 MHz and check that the test point
voltage is 3.5 V ± 0.3 V.
Then set to FM 108.0 MHz and check that the test
point voltage is less than 8.5 V.
5. AM Tracking Adjustment
L451 ...................................................................... 630 kHz
CT451 .................................................................. 1440 kHz
6. FM Tracking Adjustment
CT401 ..................................................................87.5 MHz
7. FM VCO Adjustment
Settings : • Adjustment location : SFR451
Method : Connect a frequency counter to pin 11 & 12 of IC451.
Adjust SFR 451 such that the frequency counter
indicates 19kHz ± 100 Hz.
<TAPE PLAYER SECTION>
8. Tape Speed Adjustment
Settings : • Test tape : TTA–100
• Test point : Phones Jack (J101)
• Adjustment location : SFR201
• DSL : OFF
Method : Play back the test tape and adjust SFR201 for 3015 Hz
± 10 Hz (FWD) and 3015 Hz ± 50 Hz (REV).
Then confirm WOW is less than 0.5%.
9. Dolby Level Adjustment
Settings : • Test tape : TTA–200
• Test point : TP1(LCH), TP2(RCH)
• Adjustment location : A, D (LCH)
B, C (RCH)
• VOLUME : MIN "0"
• DOLBY SW(AU) : OFF
Method : Connect a coupling capacitor (10 uF / 16 V) between the
test point and AC voltage meter about. Check the test
point voltage for 32 mV ± 1.0 dB. If TP1,TP2 level is
different from the SPEC, perform this adjustment
following the procedure below:
Out level
32mV + 1dB up
32mV + 2dB up
32mV + 2.7dB up
32mV + 1dB up
32mV + 2dB up
32mV + 2.7dB up
Solder place
D
A
A, D
C
B
B, C
TP1
(LCH)
TP2
(RCH)
– 10 –
2
SFR 451
MAIN C.B
A
PHONES
J101
1
IC451
3
GND
TP1
(LCH)
(RCH)
TP2
4
*
Note :
*
: J101 On the other side of the components.
VR101
VOLUME
IFT451
CT401
CT402
VT GND
CT451
VT GND
TP3(VT)
SFR 201
L451
(BAR-ANT)
A B
C D
11
12
5
9
9
9
8
7
6
5
8
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