Sony TC-WR445 - Adjustments; Mechanical Adjustments; Record;Playback Head Azimuth Adjustment

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
CO-102C 28 to 60g * cm
(0.39 to 0.830z * inch)
oS
3-2. ELECTRICAL ADJUSTMENTS
Forward
2 to 6g *cm
(0.028 to 0.083 oz * inch)
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 SOrE
DIRECTION 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
q) attenuator 10k Q
oO O
I] ooo
ae
LINE OUT
LINE IN
Standard Input Level
Standard Output Level
Test Tape
10kHz, — 10dB Azimuth Adjustment
315Hz, 0dB PB Level Adjustment
3kHz, 0dB Tape Speed Adjustment
OdB=0.775V
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 tum 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
LINE OUT
2.Tum 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
peak
within
1dB
R-CH
peak
Pee
—r
screw
position
position L-CH R-CH
peak peak