Sharp JC-272H Service Manual page 10

JC-272H
©
Adjustment of Difference in FWD/REV Tape Speed
1. Connect the frequency counter to the headphone terminal. 60 to 100 Hz Solder *3
2. Insert the test tape MTT-111, and play back it in FWD and
100 Hz or above
Solder *3 and 4
REV modes.
3. Solder *3, 4, 5 or 6 pattern according to frequency difference
(FWD-REV).
—100 Hz or above Solder *5 and 6
Adjust if frequency difference is more than + 60 Hz.
To Actuate the Mechanism after Removing
P.W.B.
Preparation (See Figs. 10 and 12) 4. FF/REW Operation in STOP Mode
1. Connect the 2 motor leads (A, B) with 2 solenoid leads (C, D). Turn off the dummy switch, and press the FF or REW button.
(Pay attention to polarity)
2. Connect the dummy switch, and turn it on. 5. TAPE END Operation
3. Connect the tape transport dummy signal lead (E). (1) Set to one of the above-mentioned modes.
4. Supply power. (2) Cut the tape transport dummy lead (E)
Operation
1. PLAY Operation :
(1) Press the PLAY button. Cautions
(2) When the motor starts running, turn off the dummy switch. 1. When the remote control or the mechanism button on the
main unit becomes inoperative, turn on the dummy switch,
2. DIRECTION Operation and connect the reset terminal (or pin 32 of IC5) to earth for
(1) After the PLAY operation has been completed, press the about 1 second.
PLAY button again. 2. Take care not to bend the flexible P.W.B. Carefully handle
(2) When the motor starts running in the reverse direction and the main PWB.
the solenoid is actuated, turn on the dummy switch. 3. When restoring the initial state, remove the solder at the
(3) When the solenoid is released again, turn off the dummy place where the connected lead has been removed.
switch.
3. STOP/FF/REW Operation in PLAY Mode
(1) Press the STOP, FF, or REW button.
(2) When the motor starts running, turn on the dummy switch.
MAIN PWB
RESET TERMINAL
CAM SWITCH C°S a
\ Sp OFF ,
s Zp
CY :
DUMMY
SWITCH
MOTOR LEAD WIRE
CASSETTE
CASE
Figure 10