Sony TCM-2 - SPEED CONTROL Knob

SECTION 3
ADJUSTMENTS
MECHANICAL ADJUSTMENT AND
MEASUREMENT
PRECAUTION
Clean the following parts with a denatured-
alcohol-moistened swab:
pinch roller
rubber belts
idlers
record/playback head
erase head
capstan
Demagnetize the record/playback head with a
(Do not bring the head
demagnetizer close to the erase head.)
head demagnetizer.
Do not use a magnetized screwdriver for the
adjustments.
After the adjustments, apply suitable locking
compound to the parts adjusted.
The adjustments should be performed with the
rated power supply voltage unless otherwise
noted.
Head Height Adjustment
1. Prepare an adjustment cassette as shown below.
Lid
C-120
tape cassette
Cut out hatched
portions.
2. In record mode and viewing from the front,
adjust the head heights to eliminate tape curl
and tape twist at portions shown by arrow.
erase head _record/playback
head
3-578-138-01 (t= 0.1)
3-578-138-11 (t = 0.2)
Shim, head height adjustment
:3Vdc
: center click
power supply voltage
SPEED CONTROL knob
Torque Measurement
Meter Reading Torque Meter
27 — 48 gecm
ce, (0.37 —0.66 ozsinchy | C2102€
Fast Forward 5.5 — 75 gocm
and Rewitid (0.76 —1.00z-inchy | ©2201B
2—4g°cm
(0.027 — 0.055 ozeinch)
CQ-102C
Tape Tension Measurement
[Mater [Meter ined
CQ-403A More than 100 g (3.53 oz)
ey