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AKAI ATV-350R Maintenance Manual

10.

With Picture, With Sound, No Character or Inferior Color

Check CPU 32K crystal oscillation

Change 32K crystal oscillation

Check whether CPU (22) ~ (25) to LA76810

(13) – (16) is normal or not

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

Yes

Содержание ATV-350R

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

Страница 2: ... 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 av...

Страница 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 ...

Страница 4: ...al or not Check power supply Check whether LA76810 13 12 11 pins are normal or not Yes No Yes Yes No No Check whether line field pulse of CPU is normal or not Check whether the copper sheet of line field synchronous pulse loop is open or short circuited or not Change 3Y26 Whether change CPU is OK Change the resistance Yes No No Check the LA76810 line field synchronous circuit No Check LCD screen ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 15: ......

Страница 16: ...29 10K R130 4K7 R131 33K C121 102 VS BLK R G B HS VS CHRDMA AFT C5V C122 103 C123 103 C124 103 VER 1 2 3 P5 3V GND VOL ANT D3 IN5819 C29 104 C22 104 C23 104 C24 104 C25 104 C26 104 Vin 1 GND 2 Vout 3 IC3 78L05 C31 470uF C28 100uF R40 47 R36 10K R37 1K R38 1K R39 10K Q5 D1203 FU2 C32 220uF C35 683 L1 100uH R47 4K7 C34 22P 3KV 1 2 P3 1 2 3 4 5 6 7 8 IC4 C33 104 C74 103 C30 102 R42 680K R43 36K R44 6...

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