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Troubleshooting
Solution: Ensure that the power cord is plugged into the unit and into an adequate
power source as given in
holds the ac voltage guard to the charging supply, and remove the guard. Using
the DMM, check the ac voltage to the charging power supply at its terminals (see
Figure 8-1). It should measure the same as the power being supplied to the unit. If
the ac voltage is not present, check and replace, if necessary, the ac fuse located in
the ac plug module on the rear panel.
If ac voltage is present at the terminals, use the DMM to check the dc voltage out
of the charging power supply (see Figure 8-1). It should measure 26 V dc. If this
voltage is not present, the charging power supply is defective and should be
replaced. If the dc voltage is present, the main power supply is defective and
should be replaced.
Refer to the procedure for
supply) or
supply).
Figure 8-1: Charging Supply Barrier Strip (High Voltage Guard Removed)
Front-panel Problems
Fault: The operating screen is blank, or too light or dark to read text
Solution: Turn power to the unit on and within the first second press and hold the
ENCODER. The display will begin cycling from highest to lowest contrast. Release
the ENCODER when the contrast reaches a usable level.
If the screen is still not readable, replace the display.
Refer to the procedure for
Fault: Neither the ENCODER nor any front-panel key works
Solution: Press and release the ENCODER as well as all front-panel keys, as a
stuck key will prevent any other input.
Section II
Charging Supply Removal
Power-supply Assembly Removal
Front-panel Display
under
Ac
Operation. Loosen the screw that
(if replacing the main power
Dc out
Ac in
Removal.
8-2
(if replacing the charging
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