Sony TC-377 - Electrical Adjustments and Measurements; Tape Speed Calibration and Brake Checks

Flywheel Brake Check
REW mode
, take-up
reel table
Be sure that flywheel brake
comes in contact with fly-
wheel in REW mode.
flywheel .
Tape Speed Adjustment
1. Playback SONY speed check tape (SPC-47)
at 19 cm/s (7% ips) tape speed in horizontal
position. "Read digital frequency counter
connected to LINE OUT jack. -
2. If the counter reading is out of 3,960~
4,040 Hz, replace with the motor pulley with
identification mark shown below.
(As for part No. of motor pulley, refer to page
28.) ;
SONY speed check tape SPC-47
no signal 4kHz ee) signal
4 min. 2.5 min. 26 nae
“deviation -3% -2% -1% 0 +1% +2% 43%
frequency , 3980 4020
on counter 3880 3920 “3960 _, 4000 4040 4080 4120
identification mark #2 +7 70.5 80 -0.5 -1 -2
on motor pulley
19cm/s (7 1f ips)
Deviation (%)
Variation
Limit (%)