Read Sony HCD-GPX5 Service Manual online
20
HCD-GPX5
SECTION 5
ELECTRICAL ADJUSTMENTS
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed for both L-CH and R-
CH.
6. Switches and controls should be set as follows unless other-
wise specified.
REC BAIS ADJUSTMENT
Setting:
Procedure:
1.
1.
Connect a digital voltmeter (AC range) to TP101 (L), TP201
(R) and TP (GND) on the MAIN board.
(R) and TP (GND) on the MAIN board.
2.
Insert a tape.
3.
Press the
I/
1
button to turn the power on, and press the
[FUNCTION]
button to select TAPE function.
4.
Press the
[ REC]
button twice to start recording.
5.
Adjust RV101 (L-ch), RV201 (R-ch) on the MAIN board so
that the digital voltmeter reads AC 6.15 V.
that the digital voltmeter reads AC 6.15 V.
6.
Connect an oscilloscope or frequency counter to TP101 (L),
TP201 (R) and TP (GND) on the MAIN board.
TP201 (R) and TP (GND) on the MAIN board.
7.
Confirm that the frequency is 82 kHz
±3 kHz.
Adjustment Location:
MAIN board
digital voltmeter
(AC range)
TP101 (L), TP201 (R)
TP (GND)
– MAIN BOARD (Conductor Side) –
RV201
RV101
TP (GND)
REC BIAS ADJUSTMENT
(R-CH)
(L-CH)
TP201 (R)
TP101 (L)
z
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