2. OLED is not lit
3. No Remote Control Reception
Check the connection.
Has a contact failure occurred or is a connector
missing?
FFC : MAIN PCB [
PF11
] to FRONT PCB
[WF11
]
Check the power supply voltage.
Does the power supply voltage largely deviate
from 3.3V?
MAIN PCB [
PF11 : 4pin
]
Check if the connection is as indicated in the wir-
ing diagram and adjust the FFC wiring if necessary.
If this does not re-establish contact in the wiring,
replace the FFC or the circuit board which the con-
nectors are mounted on.
The MAIN PCB [
Q221
,
Q223
] or SMPS power sup-
ply circuit may be malfunctioning.
Check each part listed after "
YES
".
NO
YES
Check the connection.
Has a contact failure occurred or is a connector
missing?
FFC : MAIN PCB [
PF11
] to FRONT PCB [
WF11
]
Is there an abnormality in any of the voltages of
FRONT PCB [
WF11
]?
[
WF11
] 12pin +16V_OLED = +16V,
8pin +3.3.VOLED = +3.3V
Is the OLED_RST logic "
Hi
" in FRONT PCB [
WF11 :
26pin
] after starting the power supply?
Check if the connection is as indicated in the wir-
ing diagram and adjust the FFC wiring if neces-
sary.
If this does not re-establish contact in the wiring,
replace the FFC or the circuit board which the
connectors are mounted on.
Check each part listed after "
YES
".
The MCU [
IC20
] is malfunctioning or latched.
Check each part of the MCU.
NO
NO
YES
YES
YES
NO
Turn on the power and check the waveform of
the digital signal.
FRONT PCB[
WF11 : 13-23pin
]
Is there an abnormality in the "
Hi
" (3.3V) or "
Lo
"
(0V) level?
NO
The MCU [
IC20
] is malfunctioning or latched.
Check each part of the MCU.
YES
Check that the OLED module contacts [
WF12
]. If
no abnormalities are apparent, it is likely there is
a malfunction in the OLED module.
Replace the OLED module.
Check that you are using a [
RC-1222
] remote control and replace the batteries.
NO
YES
Is a square wave input when the power is on and
a switch is pressed on the remote control while it
is pointed towards the device?
FRONT PCB [
RC11 : 1pin, WF11 : 6pin
]
The FRONT PCB [
RC11
] or [
WF11
] may be mal-
functioning.
Replace the [
RC11
] or FFC connector.
Is a square wave input in [
PF11]
and MCU[
IC20
]
of the MAIN PCB when the power is on and a
switch is pressed on the remote control while it
is pointed towards the device?
PF11 : 6pin
IC20 : 26pin RC_IN
NO
The 26pin of MAIN-FRONT FFC[
PF11
] or
MCU[
IC20
] may be malfunctioning.
Replace the FFC, FFC connector or MCU[
IC20
].
YES
The FRONT PCB or MAIN PCB may be malfunc-
tioning.
Replace the FRONT PCB or MAIN PCB.
NO
YES
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
49