Tape Deck Adjustment - Sanyo MCH-900F Service Manual

ii
TAPE DECK ADJUSTMENTS
u
a.
HEAD REPLACEMENTA NDHEADA ZIMUTHADJUSTMENT
(a) HEAD REPLACEMENT
. Af[er replacement, demagnetize the heads by using a degausser.
. Be sure to clean [he heads be[ote attempting to make any adjustments.
.
All
wiring should be returned to the original
posilion after
work is completed
E. HEAD
RIP HEAD
BLACK
wHITE RED YELLOW
**
*
I
/
WHiTE
(b) HEAD AZIMUTH ADJUSTMENT
(1)
HEAD AZIMUTH
ADJ
(2)
(3)
(4)
(5)
b.
(a)
Load the test tape ( VTT-703, etc., 10 kHz ) for azimuth
adjustment.
Press the PLAY
button.
Use a cross-tip screwdriver to turn
the screw for azimuth
.
/
adjustment so
that the left and right output are maximized.
Press the the STOP button.
Arler completion of the adjustment, use thread lock (TB-1401 B)
to secure the azimuth-adjustment screw.
<<*3
MOTOR REPLACEMENT AND SPEED ADJUSTMENT
\y/
MOTOR REPLACEMENT
MOTOR SPEED ADJ
/
—
(b) MOTOR SPEED ADJUSTMENT
(1) Insert the test tape ( MIT-ill N, etc., 3000 Hz ).
(2) Press the PLAY
button.
(3) Use a flat-tip screwdriver to turn the SVR (located inside the rear
of the
motor) to
adjust SVR so that the frequency counter
becomes 3,000 Hz.
c. CHECKING THE MECHANISM TORQUES AND TENSION
Clean the head, caps!an and pinch roller before making any measurement.
Measurement Take-up torque
Back tension Tape
tension
Cassette
for
PLAY: TW-21 11A Drive-power cassette
PLAY: TW-21 11A
measurement F. FWD/REW:TW-2231
TW-2412
PLAY 30-60
gr.cm 2.O-4.5 gr.cm
60
gr or more
F.FWD 55- 120gr cm
REW 55- 120gr cm
-7-