Sony TC-RX77 - Record;Playback Head Azimuth Adjustment

3.
Phase
Check
Adjustment
Location
:
Mode
:
playback
motor
rear
side
test tape variable resister
P-4-A100
(10kHz, — 10dB) oscilloscope
LCH ATK Q
LINE OUT
Screen pattern
in phase 45° 90° 135° 180°
——_-—————”
good wrong
4, Set in the REV mode and repeat the step 1-8,
5, After the adjustment, lock the screws with locking
Playback Level Adjustment
compound,
Procedure :
Adjustment Location : Record/Playback head Mode : playback
test tape
P-4-L300
(315kHz, 0dB)
VTVM
FWD REV
Sd
Adjustment
screw
LINE
OUT
Adjust RV101 (L-ch) and RV201 (R~ch) so that the reading on
Tape Speed Adjustment VTVM meets the adjustment limits below.
Setting :
test pin TP801 : short Adjustment Limits :
LINE OUT level: —7.7dBs(m) + 0.5dB(0.3~0.34V)
Procedure :
Level difference between channels: less than 0.5dB
Check that the LINE OUT level does not change even if Playback
and Stop operation is repeated several times.
Mode : playback
test tape Adjustment Location: Main board
WS-48B
(3kHz, OdB)
jo
frequency counter
1. Set to FWD playback mode.
2. Adjust motor rear side (variable resistor) so that the frequency
counter reading becomes 3,000 + 15Hz.