Sony TC-W311 - Electrical Adjustments

SECTION 1
ADJUSTMENTS
1-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head pinch roller
erase head rubber betls
capstan idlers
Torque Measurement (DECKS A and B)
Gas aoe seis
ne
1-2, ELECTRICAL ADJUSTMENTS
1. Demagnetize the record/playback and erase head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (Asa general rule, playback circuit adjustment
should be completed before performing recording circuit adjust-
ment.)
6. The adjustments should be performed for both L-CH and R-CH.
@ Switches and controls should be set as follows unless otherwise
specified.
DOLBY NR switch: OFF
TAPE SELECT switch: TYPE I (NORMAL)
e Standard Record:
Deliver the standard input signal level to the input jack
and set the REC LEVEL control to obtain the standard
output signal level.
— Record Mode —
af osc
LINE OUT
LINE IN
Note: Before recording short CN505 with a lead wire, otherwise
MUTING functions and output signal does not appear at
LINE OUT terminals.
Standard Input Level
G35V 1008
Standard Output Level
load impedance . 47kQ
output
level
0.44V
(—5dB)
Record/Playback Head Azimuth Adjustment
2-CH
Procedure:
1. Mode: FWD playback
test tape
P-4-A100
(10 kHz, -10 dB) ‘
LINE OUT
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw so.
that outputs match within 1 dB of peak.
within 1d8 :
Output level ” within 1 dB
— screw position
Screen pattern —
in phase 45° 90° 135° 180°
ye YS
good wrong
3. After the adjustment, apply suitable locking compound to the
adjustment screw.
Adjustment Location:
cs
SATURN REALS
Adjustment screw
Test Tape:
Level Adjustment
[LINE IN/OUT for TC- W301 ] : CN321
@)L-ch LINE OUT
Tape Speed Adjustment
@A-ch LINE OUT