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Extracted text from Akai AT V350 R Service Manual (Ocr-read)
Page 1
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 whether +5V 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
Ye s
No
Ye s Ye s
Ye s Ye s
No
No No No No
No
No
Check whether external circuit for
key input pin and CPU (10) (11) pins are normal or not.
Ye s
Page 2
AKAI ATV-350R Maintenance Manual
2. Repairing Procedures for Inferior Color
Check whether output voltage from
LA76810 (19) (20) (21) is normal or not
Whether LA76810 (30) (31) pins are short-circuited or not and whether (18) pin is normal or not.
Check whether loop of 3Y26 (6) (8) (9) and
LA76810 (19) (20) (21) is normal or not
Change module of LCD software
Change the broken elements of loop
Check whether periphery pf 3Y26 is normal or not
Change 3Y26
Ye s No
Ye s
No No No
