Mechanical Adjustments; Pinch Roller Pressure Adjustment; Tape Speed Adjustment; Tape Guide Adjustment - Pioneer CT-F850 Service Manual

8. MECHANICAL ADJUSTMENTS
8.1 PINCH ROLLER PRESSURE ADJUST-
1.
2.
MENT
Press the PLAY key.
Gently press tension gauges (of about 500g
scale) against the pinch roller arms. (See Fig.
8-1).
. Check that the amount of pressure required to
push the pinch rollers away from the capstans
lies in the 360 to 440 range on the take-up side,
and in the 90 to 130g range on the supply side.
If the pressure readings do not lie within these
ranges, readjust by re-attaching the pinch roller
pressure springs at suitable positions.
. If the above adjustment procedure fails to satis-
fy the above stated conditions, the pinch roller
pressure springs will have to be replaced.
8.2 TAPE SPEED ADJUSTMENT
1.
2.
Connect a frequency counter to the OUTPUT
terminals.
Playback the 3kHz section of test tape STD-301.
The frequency at the beginning of the tape
should lie within 2,995Hz and 3,010Hz. Adjust
the capstan motor adjustment screw (semifixed
resistor) with a screwdriver (See Fig. 8-2) if ne-
cessary.
. Tape speed .is increased by turning the adjust-
ment screw in the clockwise direction, and
decreased by turning in the opposite direction.
8.3 TAPE GUIDE ADJUSTMENT
The tape should be free of curling at the head
guide, and any other tape transport abnormality
during PLAY mode.
If curling does occur at the head guide, load a
cassette half equipped with a mirror, and adjust
the height of the tape guide by rotating the
height adjuster nut.
CT-FSs50
Pinch roller pressure spring
Fig. 8-1 Pinch roller pressure adjustment
Decrease
speed
5)
G
Increase speed
Fig.8-2 Tape speed adjustment
on
jae asa)
feo 96 \
°
Tape guide
Height adjuster
Fig. 8-3 Tape guide adjustment
25