Akai ATV-350R Service Manual Download Page 12

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AKAI ATV-350R Maintenance Manual

11.

No Picture or No Sound in AV

Check whether connection conversion

line is normal or not

Change AV

conversion line

Check input socket

Change input socket

Change LA76810

Yes

Check the loop of audio and LA76810 (51) pin, and the

loop of video and LA76810(42) pin

Summary of Contents for ATV-350R

Page 1: ...SERVICE MANUAL Model ATV 350R RECIVER WITH MONITOR www akai ru ...

Page 3: ...1 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 Yes No Yes No No No ...

Page 5: ...eck whether 5V 8V power supply of LA76810 is normal or not Repair power supply Check whether peripheral circuit of LA76810 26 pin is normal or not Change 1UF 333 capacitance Change module Change 3Y26 Yes No Yes Yes No Check peripheral circuit of 4001 1C circuit for treatment of line field synchronization Change LCD screen No Yes No ...

Page 6: ...r supply and subsequent circuit is short circuited or overloaded Test whether 3Y26 5V and 7 5V power supply is normal or not Check whether 3Y26 is broken or not Check the loop of power supply circuit Test whether 5V 17V and 15V of bus socket is normal or Yes No Yes No No Change module of LCD software Change LCD screen Yes No Check the loop of power supply No ...

Page 7: ...PU 1 41 42 pins Change CPU Check periphery of 50 pin for pre central amplifier Check whether circuit of pre central amplifier and periphery of LA76810 50 pin is normal or not Yes No Yes No No Check whether AGC voltage for 5V power supply of high frequency head is normal or not Change high frequency head Yes No Check 5V power supply and AGC circuit Yes ...

Page 8: ...nce Manual 7 No Storage of Program Check whether 32V tuning voltage is stable or not Repair tuning loop Check whether AFT circuit is normal or not Repair AFT circuit Yes No Yes No Change high frequency head and sound surface ...

Page 9: ...e loudspeaker Test whether power amplifier 386 is broken or not No Yes No Yes Yes Test whether power amplifier 386 is broken or not Check whether LA76810 1 2 pins are normal or not Change peripheral circuit of 52 53 54 Change peripheral elements of 1 2 pins Change LA76810 Yes No Check whether LA76810 52 53 54 pins are normal or not No ...

Page 10: ...or not Adjust till OK Check whether power supply of each circuit is normal or not Adjust potentiometer of mainboard BRI to see whether there is change or not Change 3Y26 No Yes No Yes Set analog quantity of TV at standard Yes Check whether peripheral elements of 3Y26 are normal or not No Check supply circuit ...

Page 11: ...tal oscillation Change 32K crystal oscillation Check whether CPU 22 25 to LA76810 13 16 is normal or not No No Yes Check whether pulse input of CPU line field synchronization is normal or not Change loop elements Yes Check line field synchronization circuit Inferior character color Change CPU or LA76810 No Yes ...

Page 12: ... No Sound in AV Check whether connection conversion line is normal or not Change AV conversion line Check input socket Change input socket Change LA76810 No Yes No Yes Check the loop of audio and LA76810 51 pin and the loop of video and LA76810 42 pin ...

Page 13: ...d or not Test power is on or off Test whether IC7088 11 pin is with noise or not with screwdriver Change peripheral circuit Change peripheral elements Yes NO No Yes Check whether IC7088 voltage pin are normal or not Change IC7088 Yes No Check whether IC7088 pin 5 11 2 are normal or not No ...

Page 14: ...anual 13 Battery box can not charge Put on the position of charging ON Change IC 34063 Check whether IC 34063 1 3 5 7 pins voltage is normal or not Check whether if it is on the charging position yes No Yes Change bad elements No ...

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