Electrical Adjustments - Sony HCD-HPX9 Service Manual

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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
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 BIAS ADJUSTMENT
Setting:
MAIN board
TP101 (L), TP201 (R)
TP (GND)
Mode: REC
AF OSC
TE
attenuator
L 13942296513
Adjustment Location:
– MAIN BOARD (Conductor Side) –
TP201 (R)
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ELECTICAL ADJUSTMENTS
digital voltmeter
(AC range)
i
JACK (J321)
blank tape
CS-123
600 Ω
set
REC BIAS ADJUSTMENT
(R-CH) (L-CH)
RV201 RV101
TP101 (L)
TP (GND)
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SECTION 6
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Procedure:
1. Connect a digital voltmeter (AC range) to TP101 (L), TP201
(R) and TP (GND) on the MAIN board.
2. Insert a blank tape (CS-123).
3. Press the
?/1
[FUNCTION]
[ REC]
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4. Press the
5. Adjust RV101 (L-ch), RV201 (R-ch) on the MAIN board so
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.
Confirm that the frequency is 82 kHz ±3 kHz.
7.
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co
.
HCD-HPX9
9 4 2 8
button to turn the power on, and press the
button to select TAPE function.
button twice to start recording.
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