Diagnosis; Diagnosis Flowchart - Pioneer SC-71 Service Manual

1

5. DIAGNOSIS

5.1 DIAGNOSIS FLOWCHART

NO POWER
A
This is just for general reference and does not including every single case.
No Power
Yes
Stand by
No
Yes
Fuse FU4 OPEN ?
No
Check PRIMARY ASSY
JP51-1,2,3pin or DIGITAL
B
MAIN_L ASSY
CN9501-1,2,3pin +5.6V
Yes
Check DIGITAL MAIN_L ASSY
CN601-1,2pin +5.6V
Yes
Check V-REG_SS ASSY
CN7901-30,31pin +5.6V
Yes
Check V-REG_SS ASSY
CN7903-1,2pin +5.0V
CN7902-36pin +4.9V(XRESET)
C
Yes
Check DISPLAY ASSY
CN6001-38,39pin +5.0V
CN6001-4pin +4.9V(XRESET)
Yes
Check DISPLAY ASSY
L6001 +5.0V
Yes
Check DISPLAY ASSY
C6017 +3.3V
Yes
D
Check DISPLAY ASSY
IC6001 10pin +5V (XRESET)
Yes
Check DISPLAY ASSY
IC6001 32pin (POWKEY)
HL when press power key
Yes
Check DISPLAY ASSY
CN6001 16pin (DVCPOW)
LH when press power key
Yes
Check DISPLAY ASSY
CN6001 12pin (ACRY)
E
LH when press power key
Yes
Check PRIMARY ASSY
JP51 7pin (ACRY)
LH when press power key
Yes
Does RY71 turn on
when press power key ?
Yes
Check DIGITAL MAIN_L ASSY
CN601 16pin (DVCPOW)
LH when press power key
F
Yes
Diagnose or replace
DIGITAL MAIN_L ASSY
26
1
2
Error Indications ?
Diagnose or replace
PRIMARY ASSY
Remove AC code and remove
No
CN9501. Insart AC code and
check JP51-1,2,3pin, +5.6V
No
Check +5.6V line on DIGITAL MAIN_L ASSY
Replace FFC
No
(DIGITAL MAIN_L to V-REG_SS ASSY)
No
Replace V-REG_SS ASSY
or D7901 or IC7901
No
Replace FFC
(V-REG_SS ASSY to DISPLAY ASSY)
No Replace DISPLAY ASSY
or replace L6001
No Replace DISPLAY ASSY
or replace IC6002
Check the signal path of XRESET
No
or Replace DISPLAY ASSY
No
Check the signal path of POWKEY
No
Check the signal path of DVCPOW
No
Check the signal path of ACRY
No Check the signal path of ACRY DISPLAY ASSY V-REG_SS ASSY 
DIGITAL MAIN_L ASSY PRIMARY ASSY
No
Check the circuits around RY71 or replace PRIMARY ASSY
Check the signal path of DVCPOW DISPLAY ASSY V-REG_SS ASSY 
No
DIGITAL MAIN_L ASSY
2
3
No
Jump to "No FL DISPLAY"
Yes
Refer to the
"5.2 [4] Error Indocations"
No
Diagnose or replace
PRIMARY ASSY
Yes
Diagnose the power supply path of
V+5R6_EV after PRIMARY ASSY
No Problem
No Problem
SC-71
3
4
Replace DISPLAY ASSY
Replace DISPLAY ASSY
4