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
Summary of Contents for SD-4900
Page 1: ...SERVICE MANUAL DVD VIDEO PLAYER FILE NO 810 200327 DOCUMENT CREATED IN JAPAN Jul 2003 SD 4900 ...
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Page 72: ...3 33 3 34 3 RF SERVO CIRCUIT DIAGRAM CD DVD LD will not on 02 12 26 R14601A TOSHIBA ...
Page 77: ...3 43 3 44 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD LOCATION GUIDE 5600AD ...
Page 78: ...3 45 3 46 2 KEY P C BOARD 3 TIMER P C BOARD LOCATION GUIDE Solder Side Solder Side ...
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Page 102: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...