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SECTION 4
MECHANICAL ADJUSTMENTS
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 demagne-
tizer.
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 sup-
ply 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
FF/REW
CQ-201B
FWD tension
CQ-403A
REV tension
CQ-403R
pinch rollers
rubber belts
idlers
Meter reading
28 to 71g • cm
(0.39 – 0.99 oz • inch)
1 to 7g • cm
(0.01 – 0.10 oz • inch)
28 to 71g • cm
(0.39 – 0.99 oz • inch)
1 to 7g • cm
(0.01 – 0.10 oz • inch)
56 to 122g • cm
(0.78 – 1.69 oz • inch)
100g or more
(3.53 oz or more)
100g or more
(3.53 oz or more)
SECTION 5
ELECTRICAL ADJUSTMENTS
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
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.)
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.
Tape
Signal
P-4-A100
10 kHz, –10 dB
WS-48B
3 kHz, 0 dB
P-4-L300
315 Hz, 0 dB
Record/Playback Head Azimuth Adjustment
Procedure :
1. Mode : Playback
test tape
P-4-A100
(10kHz, –10dB)
MD OUT (JK301)
set
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
level meter
+
–
9
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