Sony HTC-D159 - Mechanical Adjustments; Torque Measurement; Chucking Arm Height Adjustment; Electrical Adjustments

SECTION 2
ADJUSTMENTS
2-1. MECHANICAL ADJUSTMENTS 2-2. ELECTRICAL ADJUSTMENTS
1.
Clean
the
following
parts
with
a
denatured
alcohol-
ete
eal
EN
A,
moistened swab:
record /playback heads pinch rollers
erase
head
rubber
belts
CASSETTE
DECK
SECTION
{ ] indicates for E model.
capstan idlers
2. Demagnetize the record playback head with a head 1. Demagnetize the record “playback head with a head
demagnetizer. demagnetizer. (Do not bring the head demagnetizer
3. Do not use a magnetized screwdriver for the adjustments. close to the erase head.)
4.
After
the
adjustments,
apply
suitable
locking
compound
2.
Do
not
use
a
magnetized
screwdriver
for
the
to
the
parts
adjusted.
adjustments.
5. The adjustments should be performed with the rated 3. After the adjustments, apply suitable locking
power supply voltage unless otherwise noted. compound to the parts adjusted.
Torque Measurement 4. The adjustments should be performed with the rated
power supply voltage unless otherwise noted.
5. The adjustments should be performed in the order
0. eee Sak given in this service manual. (As a general rule,
playback circuit adjustment should be completed
Sia eo as before performing recording circuit adjustment.)
6. The adjustments should be performed for both L-CH
FWD
Back tension
Torque meter Meter reading
CQ-102C
CQ-102C
63g *cm or more
Chucking Arm Height Adjustment e Switches and controls should be set as follows unless
This
Adjustment
should
be
performed
after
the
electrical
otherwise
specified.
adjustment
and
on
replacing
adjusting
screw,
magnet,
TAPE
SELECT
switch:
TYPE
1
or chucking pulley.
Procedure:
P-4-A100
10kHz,
—
10dB
Azimath
Adjustment
1.
Set
disc
(YEDS-18)
to
the
optical
pick-up
block.
P-4-1,300
315Hz,
0dB
PB
Level
Adjustment
(Fig.
A)
\
2.
Adjust
the
bracket
(press
pulley)
to
the
center
of
Weaek
seis
Suaibote
Pape
Sheed
-Aditstnent
the magnet with adjusting screw. (Fig. B)
adjusting screw
(+B3 X 25)
Record/Playback Head Azimuth Adjustment
YEDS-18 [DECK Aj |DECK B|
Note: Perform this adjustments for both decks.
Procedure:
1. Mode: FWD playback
bracket
(press pulley)
chucking yoke
test tape
P-4-A100
(10 kHz, — 10 dB)
L-CH
oscilloscope
YEDS-18 Via _ re
magnet — chucking pulley lA
Fig. B Fig. A R-CH
CN312 [CN405]