Mechanical Adjustments; Electrical Adjustments; Deck Section - Sony HCD-VX5A Service Manual

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SECTION 5

MECHANICAL ADJUSTMENTS

Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
erase head
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
Torque Measurement
Mode
Torque meter
CQ-102C
FWD
FWD
CQ-102C
back tension
CQ-102RC
REV
REV
CQ-102RC
back tension
FF/REW CQ-201B
FWD tension
CQ-403A
REV tension CQ-403R
pinch rollers
rubber belts
idlers
Meter reading
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
71 to 143 g • cm
(0.99 – 1.99 oz • inch)
100 g or more
(3.53 oz or more)
100 g or more
(3.53 oz or more)
– 16 –
Published in Heiloo, Holland.
SECTION 6

ELECTRICAL ADJUSTMENTS

DECK SECTION

0 dB = 0.775 V
1. Demagnetize the record/playback head with a head demagne-
tizer.
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 in the order given in
this service manual. (As a general rule, playback circuit ad-
justment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless other-
wise specified.
8. Set to the DOLBY NR OFF.
9. Set to the test mode.
(1) Press the 1/
u button to turn the power ON.
(2) Select the function "TAPE A or B".
(3) Press the button of p ,
simultaneously, to set the tape deck test mode and blink
the indicator of disc tray number on the fluorescent indi-
cator tube.
(4) To exit from the test mode, press the 1/
• Test Tape
Tape Signal
P-4-A100 10 kHz, – 10 dB
WS-48B 3 kHz, 0 dB
P-4-L300 315 Hz, 0 dB
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
test tape
P-4-A100
(10 kHz, – 10 dB)
set
[ENTER/NEXT] [DISC 3]
, and
u button.
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
MAIN board
MD OUT jack (J101)
L-CH, R-CH
level meter
+
–
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