Mechanical Adjustments; Tel 13942296513; Electrical Adjustments - Sony HCD-RG444 Service Manual

HCD-RG444
SECTION 5
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MECHANICAL ADJUSTMENTS

3 7 63 1515 0
• TAPE MECHANISM DECK SECTION
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
demagnetizer.
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
supply voltage unless otherwise noted.
Torque Measurement
Mode
Torque meter
FWD CQ-102C
FWD
CQ-102C
back tension
REV CQ-102RC
REV
CQ-102RC
back tension
TE
L 13942296513
FF/REV CQ-201B
FWD tension CQ-403A
REV tension CQ-403R
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pinch rollers
rubber belts
idlers
Meter reading
3.06 – 6.96 mN • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.19 – 0.59 mN • m
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
3.06 – 6.96 mN • m
(31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.19 – 0.59 mN • m
(2 to 6 g • cm)
(0.03 – 0.08 oz • inch)
6.96 – 14.02 mN • m
(71 to 143 g • cm)
(0.98 – 1.99 oz • inch)
9.80 mN • m
(100 • cm or more)
(3.53 oz • inch or more)
9.80 mN • m
(100 • cm or more)
(3.53 oz • inch or more)
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SECTION 6

ELECTRICAL ADJUSTMENTS

2 9
8
DECK SECTION
0 dB = 0.775 V
Precaution
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 in the order given in this
service manual. (As a general rule, playback circuit adjustment
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 otherwise
specified.
• Test Tape
Tape Signal
P-4-A100 10 kHz, – 10 dB
WS-48B 3 kHz, 0 dB
Record/Playback Head Azimuth Adjustment
DECKA DECKB
Note : Perform this adjustments for both desks.
Procedure:
1. Mode: Playback
Q Q
3 6 7 1 3 1 5
test tape
AMP board
P-4-A100
SPEAKER terminal (JK441)
(10 kHz, – 10 dB)
L-CH, R-CH
set
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
within
L-CH
1dB
peak
Output
level
R-CH
peak
Screw
position
co
.
9 4 2 8
Used for
Azimuth Adjustment
Tape Speed Check
0 5 8 2 9 9 4 2 8
level meter
+
–
within
1dB
Screw
position
L-CH R-CH
peak peak
m
9 9
9 9