Electrical Adjustments - Sony HCD-HPX7 Service Manual

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 otherwise
specified.
REC BIAS ADJUSTMENT
Setting:
MAIN board
TP101 (L), TP201 (R)
TP (GND)
Mode: REC
i
AF OSC
600 Ω
attenuator
Adjustment Location:
– MAIN BOARD (Conductor Side) –
REC BIAS ADJUSTMENT
(R-CH) (L-CH)
TP201 (R)
RV201
SECTION 6
ELECTICAL ADJUSTMENTS
digital voltmeter
(AC range)
JACK (J321)
blank tape
CS-123
set
RV101
TP101 (L)
TP (GND)
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 button to turn the power on, and press the
[FUNCTION] button to select TAPE function.
4. Press the [ REC] button twice to start recording.
z
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.
7. Confirm that the frequency is 82 kHz ±3 kHz.
HCD-HPX7
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