Akai ATV-350R, Service Manual

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AKAI ATV-350R Maintenance Manual
ATV-350R Maintenance Manual
1. Repairing Procedures for No sound, No Picture and No Light
Check whether power
indicator lights in red.
Press POWER to check whether 0~5V or 5~0V
change is available on CPU (7) pin or not
Check w5V supply of
CPU is normal or not
Check whether input +12V
and 78L05 is broken or not
Change
CPU
Check whether C1815, B1203 for ON/OFF
of CPU and subsequent supply circuit is
short-circuited or not.
Change 32K
crystal
oscillation.
Change
B1203, C1815
Check whether each voltage for the
output of power supply is normal or not
Repair power supply
and supply circuit
Check whether high voltage supply
N25 is open-circuited or not
Change audion of high voltage circuit
or the high voltage transformer
Check whether output of high
voltage is available or not
Change high voltage
transformer
Change LCD
screen
Yes
No
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Check whether external circuit for
key input pin and CPU (10) (11)
pins are normal or not.
Yes