Pioneer SC-99 Service Manual page 23

5
NO FL DISPLAY
This is just for general reference and does not including every single case.
No FL DISPLAY
Yes
Dimmer ?
No
No
Check DISPLAY ASSY
JP6001 6,7pin 4.3Vac
Yes
Check DISPLAY ASSY
No
JP6001 5pin -30V (VF)
4pin +5V
Yes
Check DISPLAY ASSY
No
V6001(FL Display)
1,62pin 4.3Vac
Yes
Check DISPLAY ASSY
No
IC6003(FL uCOM)
56pin +5.0V (V+5_V),
52pin +5.0V (XFLRST)
Yes
Check DISPLAY ASSY
No
IC6003(FL uCOM)
51pin (OSC1)
Oscillating 2MHz
Yes
Check DISPLAY ASSY
No
V6001(FL Display)
damage
Yes
Replace V6001
(FL Display)
5
6
No
"FL OFF" LED light on ?
Check the path of FL AC1 and AC2
 
DISPLAY F-IN BRIDGE

FB CONNECT FRONT BRIDGE
MAIN TRANS
Check the path of V+5_V,-VF
(Signal path is same as FL AC1 and AC2)
Check the power supply path of FL AC1
and AC2 or replace DISPLAY ASSY
Check the path of V+5_V or XFLRST
or replace DISPLAY ASSY
Replace IC6003
or DISPLAY ASSY
Diagnose around IC6003
No Problem
6
7
Diagnose the circuits
(around D6010)
or replace DISPLAY ASSY
All NG

INTERFACE_M
 
REG
Other results
Other results
All NG
NG
Replace IC6003
or DISPLAY ASSY
Replace V6001(FL Display)
or DISPLAY ASSY
SC-99
7
8
Replace MAIN TRANS
Diagnose or replace
NG ASSY
Diagnose REG ASSY
(around IC7601:V+5_V, D7625,
D7267:-VF) or replace
REG ASSY
23
8
A
B
C
D
E
F