LG CED-8081B Service Manual page 23

ALPC Logic Circuit Check.
Execute 'E. LD On' of 'How to
use Test Tool(Dragon)' :
'CD-R Recording Mode'
IC601 Pin 33 (CDR/RW) = 'H'?
YES
IC601 Pin 34(WR/RE) = 'H'?
YES
IC601 Pin 27(WGATE) = 'H'?
YES
IC401 Pin 60(WLDON) = 'H'?
YES
Are IC601
pin 29(EFM1), 30(EFM2),
42(RESAMP1), 2(RESAMP2),
41(ROPC1) pulse
signals?
YES
Are IC401
pin51(WFPDSH), 50(RFPDSH),
53(WBLSH), 54(SPDSH),
51(MPDSH) pulse
signals?
YES
Are PN401 pin 30 (ODON),
31(W/XR) pulse signals?
YES
Dragon : Execute LD 'Off'
K
64
NO
•
Check the connection of IC301 pin 23.
•
Check and replace the IC301.
NO
•
Check the connection of IC301 pin 20.
•
Check and replace the IC301.
NO
•
Check the connection of IC201 pin 166.
•
Check and replace the IC201.
NO
•
Check the connection of IC601 pin 13.
•
Check and replace the IC601.
NO
•
Check the connection lines of IC201.
•
Check and replace the IC201.
NO
•
Check the connection lines of IC601.
•
Check and replace the IC601.
•
Check the connection lines of
NO
IC601 pin 21, 18.
•
Check and replace the IC601.
Dragon : Execute 'LD Off'