Measuring instructions, tools
(1)
AF VTVM
(4)
(2) FREQUENCY COUNTER (5)
(3)
OSCILLOSCOPE
DC POWER SUPPLY ; 3.0
DUMMY LOAD, 4 ohms
a. HEAD REPLACEMENT AND AZIMUTH ADJUSTMENT
●
TAPE SPEED select switch: 2.4 cm
(a) Head replacement
.
After replacement, demagnetize the heads by using
a head eraser.
● Be sure to clean the heads before attempting to make
any adjustments.
%
V (6) TEST TAPE, HEAD AZIMUTH ; 6,300 tiz
(7) TEST TAPE, MOTOR SPEED ; 3,000 HZ
(b)
(1)
(2)
(3)
(4)
b.
(a)
Head azimuth adjustment
Load the test tape ( OA-431, etc. ; 6,300 Hz ) for
azimuth adjustment.
Press the PLAY button.
Use a cross-tip ( + ) screwdriver to turn the screw
for
azimuth adjustment so that the outputs maximized.
After completion of the adjustment, use threadlock
(TB-1 401 B) to secure the azimuth adjustment screw.
MOTOR REPLACEMENT AND SPEED ADJUSTMENT
Motor replacement
AMP P.C.B
I
IBLACK~n
ML~~ODR
T
M-
RED
(b) Motor speed adjustment
(1) Load the test tape ( OA-W411, etc., 3,000Hz ).
(2) Press the PLAY button.
(3) Use a cross-tip ( + ) screwdriver to turn the
SVR601 to adjust so that the frequency counter
becomes 3,000 Hz.
c. CHECKING THE MECHANISM TORQUE AND TENS1ON
. Clean the head, capstan and pinch roller before measurement.
Measuring item
Take-up torque
Back tension Tape tension
Cassette for PLAY:TW-I111
Driving power cassette
measurement F.FWD I REW; TW-1231A
PLAY:TW-111 1
TW-1422
PLAY
4
-12 grcm
0.6-
3.0 grcm
30 gr (MIN.)
F. FWD
30-
150 gr.cm
REW
25- 60 gr.cm
-3-
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