Pioneer SC-LX85 Service Manual page 49

1
OTHER
This is just for general reference and does not including every single case.
A
12V Trig
No
12VTrig
RS-232C
No
B
RS-232C
RF Remote
No
RF Remote
C
IR/SR
IR/SR
No
D
Remote Control
No
Check the signal path of
IR-IN,SR-IN,RMC
INTERFACE ASSYCONNECT ASSY
DIGITAL MAIN ASSY
DISPLAY BRIDGE ASSY
DISPLAY ASSY
No problem
E
Diagnose DISPLAY ASSY
(IR,SR,RMC signal path,
arround U3201)
or replace DISPLAY ASSY
F
40
1
2
Check INTERFACE ASSY
CN7002 4pin +12V
Yes
Diagnose INTERFACE ASSY
(Circuits arround Q7008,Q7010)
or replace INTERFACE ASSY
Diagnose COMPONENT ASSY
(arround IC8601)
or replace COMPONENT ASSY
INTERFACE ASSY
Yes
JA7002 1pin +5V
No
Check INTERFACE ASSY
C7108 +5.6V
No
Check the power supply of
V+5R6_EV
PRIMARY ASSYDIGITAL MAIN
ASSYCONNECT ASSY
INTERFACE ASSY
Yes
NG
2
3
Check V+12_TRG power supply path
No REG ASSYFRONT BRIDGE ASSY
FB CONNECT ASSY
INTERFACE ASSY
ALL NG
Diagnose REG ASSY
(Circuits arround IC7611)
or replace REG ASSY
Check the signal path of 232RX,232TX
Still NG
COMPONENT ASSYDIGITAL MAIN ASSY
DISPLAY BRIDGE ASSYDISPLAY ASSY(IC3001)
and check the power supply path of V+5R6_EV
PRIMARY ASSYDIGITAL MAIN ASSYCOMPONENT ASSY
NG
Is 232C OK?
Yes
Diagnose INTERFACE ASSY
(IR,SR circuits)
or replace INTERFACE ASSY
Repair or replace
NG point
SC-57
3
4
Other results Repair or replace
NG point
It's problem of the RF
OK
Receiver Box or RF
Remote Controller
Diagnose INTERFACE ASSY
(circuits arround Q7022)
or replace INTERFACE ASSY
4