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9
SECTION 4
MECHANICAL ADJUSTMENTS
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 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
Meter reading
FWD
back tension
REV
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
28 to 71g • cm
(0.39 – 0.99 oz • inch)
1 to 7g • cm
(0.01 – 0.10 oz • inch)
1 to 7g • cm
(0.01 – 0.10 oz • inch)
28 to 71g • cm
(0.39 – 0.99 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
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.
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
Procedure :
1. Mode : Playback
REV
back tension
FF/REW
FWD tension
REV tension
100g or more
(3.53 oz or more)
100g or more
(3.53 oz or more)
56 to 122g • cm
(0.78 – 1.69 oz • inch)
+
–
set
MD OUT (JK301)
level meter
test tape
P-4-A100
(10kHz, –10dB)