Trouble Shooting - GE DINAMAP Compact TS Service Manual

5 Trouble Shooting.

UUT Problem
UUT will not switch on
from EXT DC source.
UUT will not switch on
when powered by
Battery.
Unit will not switch on
from either Battery or
EXT DC source.
No Keyswitch response.
No Rotor response.
When Rotor is revolved
menus are skipped.
Pressing Rotor Switch
fails to switch on unit but
menu selection is
possible.
58
Possible Causes
EXT DC adapter o/p out of spec.
EXT DC Fuse Blown.
PSU Board fault.
Battery discharged.
PSU Board fault.
On/Off switch faulty.
+5VD supply low.
PIC Processor not running.
Switch Board failure.
Main Board failure.
Rotor failure.
Switch Board failure.
Main Board failure.
Rotor failure.
Switch Board Failure.
PSU Board.
Switch Board.
Further Checks
Measure o/p.
Check Fuse.
Swap or test PSU Board.
If unit can be powered from a
battery source then a fault exists
in the external DC detect
circuitry on the PSU Board.
Measure terminal voltage of
battery.
Swap or test PSU Board.
If unit can be powered from
mains then fault lies on PSU
Board Between the Battery and
the input to IC7. Check
DC_Battery Signal is available to
the PIC and confirm operation of
USE_Battery switch TR2.
Try turning unit on by pressing
the rotor switch. If UUT switches
on check On/Off signal from
Switch Board to PSU Board.
Measure +5VD supply on Host
Comms Connector +VE Pin 4, -
VE Pin 1 and confirm is in spec.
Reset PIC by linking Pin 8 to Pin
1 on the Host Comms port
momentarily. Then attempt to
power on UUT.
Swap or test Switch Board.
Swap or test Main Board.
Test Rotor operation.
Swap or test Switch Board.
Swap or test Main Board.
Swap or test Rotor Switch.
Swap or test Switch Board.
Swap or test PSU Board.
Swap or test Switch Board.
(Probable D3 O/C)