2. OLED
2.1. OLED is not lit
Check the cable and its connection.
MAIN PCB : [
CN3002
] to FRONT PCB : [
CP119
]
Check the cable and its connection.
POWER PCB : [
CP1004
] to FRONT PCB : [
CP120
]
Check the power supply voltage.
FRONT PCB
[
CP120 : 7pin
] = +3.3V ± 0.5V, (+3.3V_CPU)
[
CP120 : 6pin
] = +3.3V ± 0.5V, (+3.3V_D1)
[
CP120 : 4, 5pin
] = +18V or more +35V or less
(+18V_OLED)
Is the power supply voltage abnormal?
Check the output voltage.
FRONT PCB
[
IC112 : 3, 6pin
] = +16V ± 1V
Does the output voltage largely deviate from
+16V?
Check the output voltage.
FRONT PCB
[
C308 :
+ terminal] = +12V ± 2V
Does the output voltage largely deviate from
+12V?
Check the EL_RESET signal after starting the
power supply.
FRONT PCB [
CP119 : 25pin
]
"
Hi
"?
Checking the Digital communication waveform
after starting the power supply.
FRONT PCB [
CP119 : 13-24pin
]
Is there an abnormality in the "
Hi
" (3.3V) or "
Lo
"
(0V) level?
Check the connection.
OLED module and [
CP118
]。
If there are no abnormalities, replace the OLED
module.
Check that the connection is correct and
reconnect FFC.
If conduction does not recover, replace the cable
or circuit board.
Check that the connection is correct and
reconnect FFC.
If conduction does not recover, replace the cable
or circuit board.
Check each part listed after "
YES
" in "
Check the following and replace for the follow-
ing parts.
FRONT PCB [
IC112
], [
R438, R439, R440
]
Disconnect [
CP118
] and check for a short circuit.
FRONT PCB [
C308 :
+ terminal] and GND。
If there are no abnormalities, replace the OLED
module.
The MCU is malfunctioning or latched.
Check each part listed after "
The MCU is malfunctioning or latched.
Check each part listed after "
".
NO
NO
NO
YES
NO
YES
YES
YES
NO
YES
OK
NG
NG
OK
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
44