3-3
Replace Main B/D
Refer to Front Part
Replace IC503
Reconnect it.
2. µ-COM Circuit
A. No Power
Does Logo appear
on the screen?
Is oscillation of
X501 normal?
Are IC501 Pins 193, 80
8
and 81 normal?
Do “Hello” appear at FLD?
Is P3901
connected normally?
Is P3901 Pin 15, 16, 19 normal?
The waveform
on 3, 5, 7 pin of IC503
normal?
Check the oscillation
Check short.
OK
Replace IC501
or IC3F1.
Check power.
(Refer to power)
If power is
normal
OK
POWER ON
1
1
YES
YES
YES
NO
YES
YES
YES
A
NO
NO
NO
NO
NO
NO
NO
YES
A
Summary of Contents for SD-3805
Page 62: ...3 31 3 32 7 A V CIRCUIT DIAGRAM SD 3805 2805 K615 02 03 19 R14137B ...
Page 66: ...3 39 3 40 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD LOCATIONGUIDE BOTTOM SIDE TOP SIDE ...
Page 68: ...MEMO MEMO ...
Page 74: ...MEMO ...
Page 76: ...M E M O M E M O ...
Page 83: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...