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RECIVER WITH MONITOR
Model:
ATV350R
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.
Yes
Press POWER to check whether 0~5V or 5~0V
change is available on CPU (7) pin or not
No
Check whether external circuit for
Check whether +5V supply of No key input pin and CPU (10) (11)
Yes
CPU is normal or not pins are normal or not.
Yes
No Change
No CPU
Check whether C1815, B1203 for ON/OFF Change 32K
of CPU and subsequent supply circuit is crystal
Check whether input +12V oscillation.
short-circuited or not.
and 78L05 is broken or not
Yes No Change
B1203, C1815
Check whether each voltage for the
output of power supply is normal or not
Yes No Repair power supply
and supply circuit
Check whether output of high Check whether high voltage supply No Change audion of high voltage circuit
voltage is available or not N25 is open-circuited or not or the high voltage transformer
Yes No
Change high voltage
transformer
Change LCD
screen
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AKAI ATV-350R Maintenance Manual
2. Repairing Procedures for Inferior Color
Check whether output voltage from
LA76810 (19) (20) (21) is normal or not
No Whether LA76810 (30) (31) pins are short-circuited or
Yes 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
No Change the broken
Yes elements of loop
Change module of
LCD software
No
Check whether periphery pf
3Y26 is normal or not
No
Change
3Y26
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AKAI ATV-350R Maintenance Manual
3. With Sound, With Light and Black Screen
Check whether power supply of LA76810
(25) (18) pins is normal or not
No Check power
Yes supply
Check whether LA76810 (13) (12)
(11) pins are normal or not
No Check whether line field pulse
Yes of CPU is normal or not.
No
Check the LA76810 line field
Whether the earthing resistance of Yes synchronous circuit.
LA76810 (29) pin is normal or not.
Whether change
CPU is OK.
No
Change the resistance
Yes
Change 3Y26
No
Check whether the copper sheet of line field synchronous
pulse loop is open or short-circuited or not.
No
Check LCD screen
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AKAI ATV-350R Maintenance Manual
4. Repairing Procedures for Line Field Asynchronization
Check whether +5V, +8V power
supply of LA76810 is normal or not
No Repair power
supply
Yes
Check whether peripheral circuit of
LA76810 (26) pin is normal or not
No
Change 1UF 333 capacitance
Yes
Check peripheral circuit of 4001 1C (circuit for
treatment of line field synchronization)
Yes
Check whether to 3Y26
(2) pin is OK or not
No Change
3Y26
Yes
Change
module
No
Change LCD
screen
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AKAI ATV-350R Maintenance Manual
5. Repairing Procedures for White Light
Test whether the switch power supply
+5V, +8V and