Troubleshooting Procedure - Sharp MZ-700 Service Manual

I
iv1Z 700
Troubleshooting procedure
Phenomennon
CD:
Motor and tape do not rotate, when the PLAY button is pushed.
Check if M+
and M·5V are
in supply.
NO
Motor fai lure
Check if the SW302
interlinked with the
P LAY push button is
active.
Phenomenon
@:
Program can not be saved
Check if the SW3OO1 interlinked
with the R EC push button is
properly operating when the
REC pushbutton is pushed.
Check if +5V on
Cl) .
NO
itch fai lure
heck if signa
is on from the
OK terminal
!J).
OV: when SW is on
+5V: when SW is off
NO
Check +5V on REMOTE terminal
@.
Check the +5V input
voltage. Check R3009.
OK
Check the motor lead wire (REM)
and the motor transistor (2S0468)
Check if voltage is on to the base of the
remote control transistor of the CPU board.
Check the CPU board.
Check if the signal
is on to the base
OK of 03002.
Failure of SW3OO1.
Check R30OS.
signal is on
to the recor
OK ding head.
OK
NO
Failure of the recordl
playback head.
Contact failure
in SW3OO1. Check
03001 and 03002.
Check if voltage is on
to the erasure head.
Phenomenon
®:
Program can not be loaded or resulted in error
Check if a
waveform is
on the terminal
®.
OK
Check the
1...----1+5V
NO supply.
No waveform with
too much noise.
NO
16
Check if the erasu re head
should have been inactive
due to failure of SW3001 .
Check peripheral components
around 03003 and for azimuth
maladjustment of the record
I
playback head.