– 9 –
SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback/erase head
pinch roller
rubber belts
capstan
idler
2. Demagnetize the record/playback head with a head demagne-
tizer.
(Head demagnetizer do not approach for the erase head.)
3. Do not use a magnetized screwdriver for the adjustment.
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
Record/Playback Head Height/Declination Adjustment
Procedures:
1. Test cassette: CQ-009C
2. Insert the mirror cassette and put the unit in record/Playback
mode.
1) Height Adjustment:
Check to see if the tape is curling at the tape guide of the head.
If it is curling, tighten screws
A
,
B
and
C
, respectively by
the same angle, moving the head so that it remains at the same
angle throughout the procedure. If it curls on the bottom side
of the mirror cassette (actually the inner side), tighten all the
screws equally; but loosen them if the tape begins to curl on
the top side. (outer side.)
Mode
Torque Meter
Meter Reading
Forward
CQ-102C
30 to 65 g•cm
(0.42 to 0.90 oz•inch)
Forward
back
CQ-102C
1 to 6 g•cm
tension
(0.014 to 0.08 oz•inch)
FF/REW
CQ-201B
70 to 120 g•cm
(0.98 to 1.66 oz•inch)
2) Declination Adjustment:
While in the record/playback position, set the back tension to
0 (wind the supply reel with something thin like a pencil in a
counterclockwise direction) and make sure there is no curling
or shifting (shifting up/shifting down) at the guide of the
record/playback head.
Because shifting can only occur due to a difference in the width
of the tape and that of the tape guides (curling will otherwise
occur), it is necessary to pay close attention since it can be
easily overlooked.
When there is a shift, tighten screws B and C equally and
change the declination of the head. If the tape is shifting up,
tighten the screws, and if it is shifting down, loosen them.
Repeat the adjustments in steps 1) to 2) and fine adjust the
height and the declination.
Adjustment Location: – record/playback head –
outside
Normal
(Record/playback head
as seen from the side of
the erasehead.)
Curling on the inner
side
Tighten screws
A
,
B
and
C
.
Curling on
the outer side
Loosen screws
A
,
B
and
C
.
inside
A
B
C
