Specifications

3. Power is not Turned ON
Symbol Name
S1
S2
S5
RY1
UN1
PU2
PWB-A
PWB-B
PWB-C
PWB-D
Power Switch
Lower Front Door Interlock
Switch
Right Door Interlock Switch
Main Relay
Control Panel
DC Power Supply 1
Master Board
MSC Board
DC Power Supply Board
Noise Filter Board
S2
S5
PU2
S1
UN1
PWB-A
PWB-D
PWB-C
PU3
RY1
Symptom Step Check Item Result Action
RY1 is not
turned ON.
1
Is there an AC voltage (power supply
voltage) across PJ2-1 and -3 on PU2?
NO
•
Check the circuit
breaker and power
supply voltage. If they
check okay, change
PWB-D.
2
Is the voltage across PJ9-2/-3 on PU2
and GND DC24V? NO
•
Check the fuse on
PU2. If it checks okay,
change PU2.
3
When S1 is OFF, is the voltage across
PJ7C-2 on PWB-C and GND DC24V?
NO
•
Change PWB-C.
4
When S1 is ON, is the voltage across
PJ7C-1/-3 on PWB-C and GND DC24V?
NO
•
Check S1, S2 and S5.
5
When S1 is ON, is the voltage across
PJ1C-5 on PWB-C and GND DC24V?
NO
•
Change PWB-C.
6
When S1 is ON, is the voltage across
PJ4-1 on PU2 and GND DC5V?
NO
•
Change PU2.
7
When S1 is ON, is the voltage across
PJ10-3 on PU2 and GND DC5V?
NO
•
Change PWB-A.
8
When S1 is ON, is the voltage across
PJ6C-1/-2 on PWB-C and GND DC24V?
NO
•
Check RY1.
Though
RY1 is
turned ON,
no control
panel
indicators
light up.
1
Is the voltage across PJ10-2 on PU2
and GND DC5V?
NO
•
Change PU2.
2
Is the voltage across PJ9-1 on PU2 and
GND DC24V?
NO
•
Change PU2.
3
Are all PJs on PWB-B plugged securely
into position?
NO
•
Plug them in securely.
4 Is PJ25 plugged securely into PWB-I? NO
•
Plug it in securely.
5
Is PJ12AA plugged securely into
PWB-A?
NO
•
Change PWB-A,
PWB-B, UN1 or PWB-I.
T-125