5-3
IM80B80T10E 21th Edition : Jul.1,2007-00
< 5.MAINTENANCE >
(2) Speed Indicator (LR524, LR525)
Is the AC power (on-board power)
being supplied?
Is the backlight turned on?
Check the on-board
power supply.
Is the fuse in the master
unit working normal?
Replace the EL plate.
Is power being supplied to the
master unit?
(Measure the voltage beween TB2
terminals 6 and 7 using a circuit
tester 21V DC to 31V DC ±5%)
Defect in the P.C.board in
the speed indicator
Is there any error -indicationg LED
turned on in the master unit?
Replace the fuse.
Failure in the 24 V DC power sup-
ply in the master unit
Error in the master
unit
Is 24 V DC power being sup-
plied?
YES
YES
YES
NO
YES
NO
YES
SERVICE CALL
NO
NO
NO
NO
YES
(3) Errors in the Master Indicator
Dose an LED remain on even when the
master unit power is turned off
YES
Service call
If an error occurs in the master indicator, the corresponding error code automatically appears on
the display as shown on the following page.
� If two or more errors occur simultaneously, their codes are displayed in a combined manner.
� The display returns to the previous state (the state immediately before the error indication) as
soon as the error or errors are removed.
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