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M - 2
No DC Power
Possible cause Slep
I
OVCKIl~~~llt
detection
rirruit
AC power
2
WiriI>g
3
DC load
DC controller
PCB
Power supply
Status indication display on control panel does not work
M - 3
properly.
Possible rause Step
C o n t r o l p a n e l 1
V i d e o
controller PCB
M - 4
Beeper on the control panel keeps sounding.
Possible cause Step
Check
Does
the problem improve when the
power switch is turned OFF, then back
ON?
Detach connector J 102. Turn the
power switch ON. Is AC power present
between J 102-l and J 102-2 of the AC
power supply?
Turn the power switch OFF, detach
connector
103. Turn the power
J
switch ON, and measure the voltage
between the terminals shown in
table below. Is the voltage normal?
Check
Does the problem improve when you
replace the control panel ?
Check
Is the voltage between connector 54-l 1
(Buz) and 54-13 (GND) on the video
controller PCB about 5 V?
1
Result
!
Y E S
Determtne why the over-
current detection circuit of
the power supply activates.
c
~ NO
Check by following the
steps in M- 1. *No AC
Power".
,
Check the wiring from the
YES
' DC controller PCB and DC
load. If it is normal. replace
the
the DC controller PCB.
Replace the power supply.
Result
Y E S
Replace the control panel.
NO
Replace the video controller
PCB.
Result
Replace the video controller
CHc'WTER 6
Procedure
Procedure
Procedure
6 - 29
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