55
HCD-HPX9
SECTION 6
ELECTICAL 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
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
digital voltmeter
(AC range)
TP101 (L), TP201 (R)
TP (GND)
– MAIN BOARD (Conductor Side) –
RV101
REC BIAS ADJUSTMENT
(R-CH)
(L-CH)
TP101 (L)
z
AF OSC
JACK (J321)
blank tape
CS-123
set
attenuator
600
Ω
i
Mode: REC
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.
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.
Adjustment Location:
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