3-4
3. Test & debug flow
TEST
Check the POWER PART
No
Yes
No
Yes
No
No
No
Yes
Yes
Check the POWER PART
Check the regulators or diode( D670).
Check the cable connection Front
Panel & Communication Signal
1. Check 27MHz system clock.
2. Check systemreset circuit.
3. Check FLASH R/Wenable signal PRD,
RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circui t.
Check the
AC Vol tage
Power PCBA (110V
or 220V)
Switch on the Power PCBA
Is
the DC Vol tage
outputs OK?
(5V, 3.3V, 8V, 12V)
Is 3.3V and 2.5V DC
outputs normal on main
PCBA?
Update
FLASH(IC5A1)
successfully?
Replace FLASH( IC5A1)
A
Communication between
IC901 & MT1379 is normally?
Connect to PC RS232 Cable and
update the FLASH memory code.
Make sure the main
PCBA don’t
Содержание DVB352
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Страница 44: ...3 37 3 38 5 2CH 5 1CH CIRCUIT DIAGRAM 5 1CH Audio Bad 2CH Audio Bad 2CH Audio Bad SR5850D DM7912N...
Страница 48: ...3 45 3 46 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD TOP SIDE LOCATION GUIDE...
Страница 49: ...3 47 3 48 2 MAIN P C BOARD BOTTOM SIDE LOCATION GUIDE...
Страница 50: ...3 49 3 50 3 KEY P C BOARD LOCATION GUIDE Solder Side Solder Side 4 TIMER P C BOARD LOCATION GUIDE...
Страница 51: ...3 51 3 52 5 POWER P C BOARD LOCATION GUIDE Solder Side...
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