17
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
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 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
Record/Playback Head Azimuth Adjustment
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
Note:
Perform this adjustments for both decks
Procedure:
1. Mode: Playback
Precaution
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
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
set
main board
CN301
Pin
3
(L-CH)
Pin
1
(R-CH)
main board
CN301
Pin
2
(GND)
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.80 N • m
100 g or more
(3.53 oz or more)
9.80 N • m
100 g or more
(3.53 oz or more)
Mode
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Содержание HCD-VX77
Страница 28: ...HCD VX77 VX77J 28 28 7 3 PRINTED WIRING BOARD BD SECTION See page 23 for Circuit Boards Location ...
Страница 35: ...HCD VX77 VX77J 35 35 7 10 SCHEMATIC DIAGRAM MAIN 1 3 SECTION See page 59 for IC Block Diagrams ...
Страница 37: ...HCD VX77 VX77J 37 37 7 12 SCHEMATIC DIAGRAM MAIN 3 3 SECTION See page 34 for Printed Wiring Board ...
Страница 39: ...HCD VX77 VX77J 39 39 7 14 SCHEMATIC DIAGRAM POWER AMP SECTION ...
Страница 43: ...HCD VX77 VX77J 43 43 7 18 SCHEMATIC DIAGRAM LEAF SW SECTION ...
Страница 45: ...HCD VX77 VX77J 45 45 7 20 SCHEMATIC DIAGRAM DRIVER SECTION See page 58 for IC Block Diagrams ...
Страница 47: ...HCD VX77 VX77J 47 47 7 22 SCHEMATIC DIAGRAM TRANS SECTION ...
