Read Sony HCD-GRX9000 / HCD-RX900 / MHC-GRX9000 / MHC-RX900 Service Manual online
– 13 –
DECK SECTION
0 dB=0.775 V
SECTION 6
ELECTRICAL ADJUSTMENTS
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
P-4-L300
315 Hz, 0 dB
Level Adjustment
DECK A DECK B
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
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.)
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.
• Test Tape
Record/Playback Head Azimuth Adjustment
Note:
Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
1. Mode: Playback (FWD)
set
MAIN board
CN301
Pin
CN301
Pin
3
(L-CH)
Pin
1
(R-CH)
MAIN board
CN301
Pin
CN301
Pin
2
(GND)
+
–
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
SECTION 5
MECHANICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
1. Clean the following parts with a denatured alcohol-moistened
swab:
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
supply voltage unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
FWD
CQ-102C
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
FWD
CQ-102C
2 to 6 g • cm
back tension
(0.03 – 0.08 oz • inch)
REV
CQ-102RC
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
REV
CQ-102RC
2 to 6 g • cm
back tension
(0.03 – 0.08 oz • inch)
FF/REW
CQ-201B
71 to 143 g • cm
(0.99 – 1.99 oz • inch)
FWD tension
CQ-403A
100 g or more
(3.53 oz or more)
REV tension
CQ-403R
100 g or more
(3.53 oz or more)
Click on the first or last page to see other HCD-GRX9000 / HCD-RX900 / MHC-GRX9000 / MHC-RX900 service manuals if exist.