Sony TCM-939 - Section 3: Adjustments and Calibration; Mechanical Adjustments; Electrical Adjustments

SECTION 3
ADJUSTMENTS
3-1.
MECHANICAL
ADJUSTMENT
Adjustment
Location:
Reel/Capstan
Motor
(M901)
PRECAUTION
1.
Clean
the
following
parts
with
a
denatured-alcohol-moistened
swab:
ro
6]
record/playback
head
pinch
roller
reel/capstan
motor
erase
head
rubber
belts
(M901)
capstan
Z. Demagnetize the record/playback head with a head demagnetizer.
Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the parts
adjusted.
C
)
5. The adjustments ahould be performed in the rated power supply
voltage unless otherwise noted.
w&
Torque
Measurement
tape
speed
adjustment
Torque
Torque
meter
Meter
reading
27
to
70
gecm
.
Pw)
CQ-102C
(0.37
to
0.98
ozeinch)
Record/Playback
Head
Azimuth
Adjustment
FWD.
1.5
to
5.5
gecm
gee
:
CQ-102C
07
ozei
Setting:
Back
tension
(0.02
to
0.07
ozeinch)
VOL
aanivale
ineohanice
aad?
80
to 156
gecm
FF,
REW
CQ-201B
:
.
(1.12
to
2.1
ozeinch)
Adjustment
Procedure:
1.
Mode:
Playback
3-2.
ELECTRICAL
ADJUSTMENTS
test
tape
P-4-A063
Tape Speed Adjustment (6.3 kHz, — 10 dB)
Setting:
—
|
set
=4
3
VOL
control:
mechanical
mid.
earphone jack
Adjustment Procedure:
1. Mode: Playback
speed checker 2. Turn the adjustment screw for maximum VTVM reading.
LFM-30 Note: Serval peaks may appear, but take the the maximum.
fecueney 3. After the adjustment, lock the screws with locking compound.
counter
WAGER Adjustment Location: Record/Playback Head
(3 kHz, 0 dB)
earphone jack
Specification:
Speed checker Frequency counter
2,910 to 3,090 Hz
adjustment screw