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SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1.
Clean the following parts with a denatured alcoholmois-
tened swad:
record/playback head
erase head
pinch roller
rubber belts
capstan
idlers
2.
Demagnetize
the record/playback
head
with
a head
demagnetizer.
(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 perfomed
with the rated
power supply voltage unless otherwise noted.
Torque Measurement
Meter reading
30 to 65g * cm
CQ-1020
(0.42 to 0.90 02 « inch)
Forward
1 to 6g*cm
CR 1ee
(0.014 to 0.0802 + inch)
30 to 65g * cm
©0-102RC
(0.42 to 0.9002 « inch)
Reverse
1 to 6g * cm
back tension
€Q-102RC
(0.014 to 0.0802 * inch)
Forward,
70 to 120g > cm
Reverse
€Q-201B
(0.98 to 1.67 oz « inch)
| DXA-H2750
SECTION 4
ELECTRICAL ADJUSTMENTS
PRECAUTION
1.
The adjustment should be performed in the publication.
(Be sure to make playback adjustment at first.)
2.
The adjustment and measurement should be performed
for both L-CH and R-CH.
@ Switch position
DOLBY NR switch: OFF
3.
Perior to electrical
adjustments,
short the connector
TP401 (test mode).
Test Tape
[Tape
| __—Contents
[|
Use
P-4-A100
10kHz, —10dB
Azimuth Adjustment
P-4-L300
315Hz,
0dB
Level Adjustment
WS-48B
3kHz,
0dB
Tape Speed Adjustment
Record/Playback Head Azimuth Adjustment
Procedure :
1.
Forward Playback Mode
test tape
P-4-A100
(10kHz, —10dB)
TP201 (LINE OUT)
2.
Turn
the adjustment
screw
for the maximum
output
levels. If these levels do notmatch, turn the adjustment
screw until both of output levels match together within
1dB.
L-CH
peak
within 1dB
R-CH
screw
Peak
position
L-CH
RCH
~ —
peak
peak
er
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