Tape Deck Adjustments - Sanyo GCD 2700 Service Manual

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TAPE DECK ADJUSTMENTS
It)
CHECKING THE MECHANISM TORQUES
1. Clean the head, capstan and pinch roller before making any measurement.
Meawing Item Take-up torque
Back tendon Tape tendon
Cassette for PLAY:TW-211
1
PIAY:TW-211 1
Drive-power cassette
measurement F. FWD/REW:lM/2231
TW-2412
PLAY 3@60gr"cm
1.5-4 .5gr*cm
60gr or more
F. FWD/REW 55- 120gr "cm
IU) MOTOR REPLACEMENT AND SPEED ADJUSTMENT
A) Motor replacement
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1. See illustration at right.
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B) Motor speed adjustments
1. Make the adjustment near where the test tape
finishes winding.
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2. Be sure to make the adjustment of the motor
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speed only after completion of the high-speed tim-
ing adjustment for tape deck A and tape deck B,
and then making the normal-speed timing adjust-
bfl '\
ment
of decks
A
and
B.
'~ '---x 7
...
...
OECK F!C.B
o
CNOOS
o
"o
L-CH E R-CH
o
TAPE OUT
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KOOTED"" -
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HIGH SPEED 21
TEST POINT #n CNO05
f 1
NORMAL SPEED
SHORT HIGH SPEED
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Insert the test tape (MTT-1 11, etc. 3,000 Hz)
into tape deck A.
Press tape deck A's PIAY button.
Adjust SVROO1 so that the frequency counter
shows a reading of 3,000Hz.
Press tape deck A's STOP button.
Insert the test tape into tape deck B.
Press tape deck B's PLAY button.
Checking the frequency counter shows a reading
of 3,000 Hz (-40, + 70Hz).
Press tape deck B's STOP button.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Insert the test tape (TCW–2 11, etc. 1,500 Hz op-
tional). into tape deck A.
Prass tape deck A's PLAY button.
Set to the high-speed condition.
Short-circuit test points CNO05 pins 1 and 2.
Checking the frequency counter reading is 3,000
Hz.
Press tape deck A's STOP button.
After the completion of the adjustment, remove
the short-circuit between test points CNO05 pins
1 and 2.
–lo–