Mitsubishi SL2U Service Manual page 8

DIAGNOSIS INFORMATION
Outline of self-diagnosis function
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. There are 2 ways for diagnosis.
1 Connect a personal computer to the product. Then, input [00 ~ CHK] from the hyper-terminal window of the personal
computer during stand-by.
2 Connect a personal computer and click the "diagnosis" button of PCGC, the diagnostic software to read the warning
history.
Note: Diagnosis can be carried out by turning on the main power and then turning on the power of the operation panel.
However, as the diagnosis items are different and it may cause a secondary failure, carry out the diagnosis in the above-
mentioned way normally.
Diagnosis result indication
LED indication and failures are shown in the following table. LED can be reset "automatically" or "by turning on/off of the main
power" when the fault detection is finished.
LED Error Indication List
LED Indication
Preferen-
tial order
POWER LAMP
1 --- ---
Red/Green
2 Green
alternately
Red/Green
Red
alternately
Red/Green
Red
alternately
3
Red/Green
Red
alternately
Red/Green
Red
alternately
Red/Green
4 ---
alternately
Red/Green
5 Orange
alternately
Red/Green
6 ---
alternately
: LED off Orange
---
Red flash N : The cycle that Red flashes N times and goes out for fixed time is repeated.
Symptom
TEMP
STBY5 is not
output
---
STBY5 is
being output
Red No power-on
Red
No power-on
flash
Red
No power-on
flash 2
Red
No power-on
flash 3
Red
No power-on
flash 4
--- No power-on
Red
No power-on
flash
Red
No power-on
flash
: Both Red and Green light
Failure
AC system (Primary
power source) failure
Secondary power source
failure
IC700 is not operating
Microcomputer is not
operating
CPU bus failure
MEMBRANE failure
IIC bus 1 failure
(EEPROM)
FAN STOP : Intake fan
FAN STOP : Exhaust fan
FAN STOP : POWER
UNIT fan
FAN STOP : PBS fan
LAMP COVER open
(POWER-ON inhibited for
safety)
STBYR5 power
Missing thermistor
- 1 -
Check Point
PCB Reference
INLET,
POWER
STBY5 (SF-8 pin),
POWER,
MAIN
STBY3.3 (IC7A4)
IC700-80pin (RESET),
MAIN
X700 (20MHz)
IC7A0-91pin (RESET),
MAIN
IC7A0-4pin (10MHz)
IC7A0-CA0 to 17, CD0 to 15
MAIN
IC700-CA0 to 17, CD0 to 15
MAIN,
ST Connector
MEMBRANE
IC705
MAIN
ICLK0, IDA0
MAIN SX Connector
MAIN SW Connector
MAIN SP Connector
MAIN SY Connector
SN Connector,
MAIN
LAMP COVER
POWER, SD Connector,
MAIN STBY5 (SD-6 pin)
MAIN SZ Connector
Reset
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Main
Power
Auto
Main
Power
Main
Power