FL-204 Board flowchart
Power button on the main unit does not work
Key1 does not operate
Does symptom improve
when replacing
FL-204
board?
No
To IFcon section
Is there voltage of about 3.3V at pin
3
of
CN702
without pressing the keys?
No
To IFcon section
Yes
Yes
CN331
pin 1
to near 0V when pressing
the power button
No
Check pattern and S331
Check the potential voltage CN702
pin3 change from +3.3V to near 0V
when pressing the stop button.
Yes
IF-172 IF board flow chart
Does symptom improve when replace
IF-172
board?
Yes
Which row of keys do not operate?
STOP buttons ->
Key1 does not operate
Reference: Relationship of Buttons and Voltages
OPEN/CLOSE button ->
Key2 does not operate
PLAY button ->
Key3 does not operate
Input
2.90-3.30
0.00-0.40
KEY0
Key_OFF
POWER
KEY1
Key_OFF
STOP
KEY2
Key_OFF
OPEN/CLOSE
KEY3
Key_OFF
PLAY
9-8
Disconnected harness or
FL-203
board
replace
change from 3.3V
might be broken
flowchart
Reconnect harness, if symtoms
do not improve, replace
harness
Does harness disconnected
CN331
or broken
from
Yes
No
No
To IFcon section
flowchart
Reconnect FFC, if symptoms
donot improve, replace
FFC
Does FFC disconnected
CN702
or broken
from
Yes
No
flowchart
Disconnected FFC or
IF-172
board
replace
Reconnect FFC, if symtoms
do not improve, replace
FFC
Does FFC disconnected
CN702
or broken
from
Yes
Check pattern and S703 might be broken
Yes
Is there voltage of about 3.3V at pin
2
of
CN702
without pressing the keys?
To IFcon section
Yes
Check the potential voltage CN702
pin2 change from +3.3V to near 0V
when pressing the stop button.
flowchart
Disconnected FFC or
IF172
board
replace
Reconnect FFC, if symtoms
do not improve, replace
FFC
Does FFC disconnected
CN702
or broken
from
Yes
No
Check pattern and S702 might be broken
Yes
Key2 does not operate
Is there voltage of about 3.3V at pin
1
of
CN702
without pressing the keys?
To IFcon section
Yes
Check the potential voltage CN702
pin1 change from +3.3V to near 0V
when pressing the stop button.
flowchart
Disconnected FFC or
IF -172
board
replace
Reconnect FFC, if symtoms
do not improve, replace
FFC
Does harness disconnected
CN702
or broken
from
Yes
No
Check pattern and S701 might be broken
Yes
Key3 does not operate
No
No
No
BDP-S485
No
No