LG CED-8042B Manual page 63

ALPC Logic Circuit Check.
Refer to 'F. LD On' of 'How to use
Test Tool (Dragon)'
: 'CD-R Recording Mode'
Is the IC205
pin 19 (CDR/RW) 'H'?
YES
Is the IC205 pin 16 (WR/RE) 'H'?
YES
Is the IC209 (RL5E808B)
pin 166 (WGATE) 'H'?
YES
Is the IC601 pin 43 (WLDON)
'H'?
YES
Is the IC404
pin 3 (CDR_WR) 'H'?
YES
Is the IC404 pin 8 (WREN)
& pin 11 (RFGUP)'L'?
YES
Is the IC209
pin 152 (EFM1), 153 (EFM2),
162 (RESAMP), 163 (ROPC1), 164
(ROPC2) 'pulse'?
YES
Is the IC601
pin 39 (WFPDSH),38 (RFPDSH),
37 (WBLSH), 36 (SPDSH),
35 (MPDSH) 'pulse'?
YES
Is the CN601
pin 30 (ODON), 31 (W/XR)
'pulse'?
YES
Dragon : Do LD 'Off'
YES
K
70
NO Check the cold soldering for IC205 pin 19.
Check communication line between IC205
and IC202 (MICOM).
Check the cold soldering for IC205 pin 16.
NO
Check communication line between IC205
and IC202 (MICOM).
Check the cold soldering for IC407,
NO
IC209 pin 166.
Check communication line between
IC202 and IC209 (RL5E808B).
NO
Check the cold soldering for IC401,
IC407, R401, R417.
NO
Check the cold soldering for IC403,
IC404, IC406.
NO
Check the cold soldering for R416,
IC404, IC405.
Check the cold soldering for IC209
NO
pin 152, 153, 162, 163, 164.
Check the cold soldering for IC402,
IC407.
Check the cold soldering for IC601 pin 39,
NO
38, 37, 36, 35.
Check the cold soldering for R684, R651,
R649, R497, R496, IC403, IC401.
Check the cold soldering for R626,
NO
R612, R655, R657, C401, IC407,
CN601 pin 30, 31.
Dragon : Do LD 'Off'
Go to <Picture 10>
Go to <Picture 11>