Sony TC-WR645S - Page 6

SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS.
PRECAUTION
1.Clean the following parts with a denatured alcohol-moistened
swab:
record/playback/erase head
rubber belts
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 performed with the rated power
supply voltage unless otherwise noted.
pinch roller
capstan
Torque Measurement
Meter reading
(0.42 to 0.830z * inch)
Forward 1 toSg*cm
Coe (0.014 to 0.069 oz * inch)
30 to 60g * cm
ae ec (0.42 to 0.83 02 « inch)
Reverse I toSg*cm
open (0.014 to 0.069 oz « inch)
65 to 90g*cm
(0.903 to 1.24 ozeinch)
FF/REW CQ-201B
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
1. The adjustment should be performed in the publication.
(Be sure to male playback adjustment at first.)
2. The adjustments and measurement should be performed for both
L-CH and R-CH.
@ Switch position
DOLBY NR switch SOFF
DIR MODE switch =
@ Standard record position :
Deliver the standard input signal level to input jack and set the
REC LEVEL control to obtain the standard output signal level
as follows.
— Record Mode —
AF OSC
VTVM
co attenuator 10k
1] ooo
| ee |
LINE OUT
LINE IN
Standard Input Level
Input terminal LINE IN
input signal level 0.5V ( — 3.8dB)
Standard Output Level
Output terminal LINE OUT
output signal level 0.5V ( — 3.8dB)
Test Tape
[Tape [Contents [Use ——*d
10kHz, — 10dB Azimuth Adjustment
PB Level Adjustment
Tape Speed Adjustment
315Hz, 0dB
3kHz, 0dB
Test Mode
1. Insert a short-circuit plug into TP801 (2P) and turn ON the
power switch. (Earth pin @ of IC801 and turn ON the power
switch.)
At first, all the fluorescent tubes light up, then the system returns
to normal display. .
2. To release the test mode, remove the short plug and turn off the
power switch.
3. Remove the short plug after completion of adjustment.
Record/Playback Head Azimuth Adjustment
Procedure : .
1. Forward playback Mode
test tape
P-4-A100
(10kHz, — 10dB) VTVM
c=
LINE OUT
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both of ~
output levels match together within 1dB.
L-CH within
Beale
within
10B
R-CH
peak
Solow
—r
screw
position
position L-CH R-CH
peak peak