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Chapter 1 Troubleshooting
4.2 Level 2 FIP
FIP1.24 LVPS
Step Check
Yes
No
Possible causes:
LVPS (PL12.1.5)
HVPS/MCU (PL12.1.19)
HARNESS ASSY LVPS (PL12.1.1)
1
Checking LVPS (PL12.1.5) control power
Remove SHIELD PLATE LVPS. (RRP12.1)
Disconnect P/J41 from LVPS.
Turn the power ON.
Check the voltages below are in specified value.
P/J41-1(+) and P/J41-2(-): 3.3 V
P/J41-4(+) and P/J41-3(-): 5 V
Go to step 2.
Replace LVPS.
(RRP12.3)
2
Checking LVPS driving power
Disconnect P/J42 from LVPS.
Turn the power ON.
Is the voltage across P/J42-1(+) and P/J42-2(-), 24
VDC?
Go to step 3.
Go to FIP2.9
INTERLOCK S/W
24V, FIP1.34
INTERLOCK S/W
REAR or FIP2.12
SWITCH I/L ASSY.
3
Checking HARNESS ASSY LVPS for continuity
Turn the power OFF.
Disconnect P/J11 from HVPS/MCU.
Disconnect P/J41 from LVPS.
Is each cable of J11 and J41 continuous?
Go to step 4.
Replace HAR-
NESS ASSY LVPS.
4
Checking AC power source
Is AC power supply outlet appropriately wired and
earthed?
Replace HVPS/
MCU.
(RRP12.10)
Inform the client or
the electrician.
