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SECTION 2
MECHANICAL ADJUSTMENTS
PRECAUTION
1.
Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head
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
Forward
CQ-102C
Forward
CQ-102C
Back Tension
Reverse
CQ-102RC
Reverse
CQ-102RC
Back Tension
FF, REW
CQ-201B
• Tape Tension Measurement
Mode
Tension Meter
Forward
CQ-403A
Reverse
CQ-403R
pinch roller
rubber belts
idlers
Meter Reading
36 to 61g•cm
(0.50 – 0.84 oz•inch)
2 to 6g•cm
(0.026 – 0.082 oz•inch)
36 to 61g•cm
(0.50 – 0.84 oz•inch)
2 to 6g•cm
(0.026 – 0.082 oz•inch)
61 to 143g•cm
(0.85 – 1.98 oz•inch)
Meter Reading
more than 100 g (3.53 oz)
more than 100 g (3.53 oz)
— 4 —
SECTION 3
ELECTRICAL ADJUSTMENTS
DECK SECTION
0 dB=0.775V
1.
Demagnetize the record/playback head with a head
demagnetizer. (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
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.
8.
Set to test mode. (Press key switch same time
SPECTRUM ANALYZER
EFFECT ON/OFF button.)
•
Test Tape
Tape
Signal
P-4-A100
10 kHz, –10 dB
WS-48B
3 kHz, 0dB
P-4-L300
315 Hz, 0dB
Record/Playback Head Azimuth Adjustment
DECK A
DECK B
Note : Perform this adjustments for both decks. Remove the covers
of cassette holders.
Procedure:
1.
Mode: Playback (FWD)
test tape
P-4-A100
(10 kHz, –10 dB)
rear panel
set
VIDEO1
AUDIO OUT connector
(L: L-CH)
(R: R-CH)
ENTER/NEXT and
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
level meter
+
–
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