Mitsubishi S290U Service Manual page 2

DIAGNOSIS INFORMATION
This product is provided with the self-diagnosis function. In case of any abnormality, the LED at the top of the product will
indicate the errors.
Diagnosis method : Every time the main power is turned on, the SW is turned on and each sensor is checked for any
Diagnosis result indication : LED indication and failures are shown in the following table. LED can be reset "automatically" or
LED Error Indication List
: LED off
---
LED Indication
Preferen-
tial order
POWER LAMP
1 --- ---
Red/Green
Green
alternately
Red/Green
Green
alternately
Red/Green
Green
alternately
2
Red/Green
Green
alternately
Red/Green
Green
alternately
Red/Green
Green
alternately
Red/Green
Orange
alternately
3
Red/Green
Orange
alternately
errors in 4 seconds. The POWER LED remains red during the check.
"by turning on/off of the main power" when the fault detection is finished.
Orange : Both Red and Green light
Red flash N : The cycle that Red flashes N times and goes out for fixed time is repeated.
Symptom
TEMP
The front fan AC system (Primary
stops. power source) failure
STBY power
---
The front fan
Microcomputer is not
is operating. operating
PI0 is not operating
MEMBRANE failure
IIC bus failure
Red No power-on
(EEPROM)
Red PI01 operation failure
No power-on
flash IIC bus failure
Red PI02 operation failure
No power-on
flash 2 IIC bus failure
Red PI03 operation failure
No power-on
flash 3 IIC bus failure
Red PI04 operation failure
No power-on
flash 4 IIC bus failure
Red PI05 operation failure
No power-on
flash 5 IIC bus failure
Red
No power-on STBY power failure
flash
Red
flash No power-on SW power failure 3
2
Failure
PCB
INLET
POWER
PFC
POWER
MAIN
MAIN
MAIN
MAIN
MENBRANE
MAIN
MAIN
MAIN
POWER SUB
AUDIO/MOTOR
TERMINAL
POWER SUB
MAIN
TERMINAL
POWER
MAIN
Check Point
Reference
STBY5 (SD 2pin),
STBY3.3 (SD 6pin or
TPST3.3),
STBY2.5 (TPST2.5)
IC417 (RESET),
X403 (100MHz),
X402 (40MHz)
IC7A0 (PIO0)
SCL3, SDA3
ST Connector,
Replace the Membrane switch
IC414 (EEPROM)
SCL1, SDA1
IC7A2 (PIO1)
SCL3, SDA3
IC7A3 (PIO2)
SCL3, SDA3
IC9A5 (PIO3)
SCL3, SDA3
IC9W0 (PIO4)
SCL3, SDA3
IC305 (PIO5)
SCL3, SDA3
SP Connector
STBYR5 (SP 6pin)
SD Connector
SW3.3 (SD 8pin)
Reset
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Auto
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
1