Read Sony HCD-GR3 / HCD-RX30 / MHC-GR3 / MHC-RX30 Service Manual online
— 10 —
SECTION 4
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback heads
record/playback heads
pinch rollers
erase head
rubber belts
capstan
idlers
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
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
Torque
Torque meter
FWD
Meter reading
FWD
back tension
back tension
FF/REW
FWD tension
CQ-102C
CQ-102C
CQ-201B
CQ-403A
30 to 80g • cm
(0.41 – 1.11 oz • inch)
1.5 to 5.5g • cm
(0.02 – 0.08 oz • inch)
100g or more
(3.53 oz or more)
55 to 130g • cm
(0.76 – 1.80 oz • inch)
DECK SECTION
0 dB=0.775V
1. Demagnetize the record/playback head with a head damagnetizer.
(Do not bring the head demagnetizer close to the erase head.)
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustments should be performed with the rated power sup-
ply 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 adjust-
ment.)
should be completed before performing recording circuit adjust-
ment.)
6. The adjustments should be performed for both L-CH and R-ch.
7. Switches and controls should be set as follows unless otherwise
7. Switches and controls should be set as follows unless otherwise
specified.
SECTION 5
ELECTRICAL ADJUSTMENTS
Tape
P-4-A100
WS-48B
P-4-L300
Signal
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
(Deck A, Deck B)
Note : Perform this adjustments for both decks.
Procedure :
1. Mode : Playback
1. Mode : Playback
main board
CN307
Pin
CN307
Pin
2
(GND)
set
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
main board
CN307
Pin
CN307
Pin
3
(L-CH)
Pin
1
(R-CH)
level meter
+
–
–
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