Base Axis Movement Malfunction; Base Axis Does Not Stop At The Pet Or Ct Positions; Digits Disappear From Gantry Display - GE Discovery LS System Service Manual

GE H
EALTHCARE
D 2307224-100, R
IRECTION EVISION
12.3.3

Base Axis Movement Malfunction

If the base axis does not move properly, perform the following checks:
1.) Check for possible Elevation Tilt Amplifier malfunction. (See the LightSpeed Plus General
Service Manual, Direction 2243314-100.)
2.) Check for possible E/T or ETC control loop of amplifier malfunction. (See the LightSpeed Plus
General Service Manual, Direction 2243314-100.)
12.3.4

Base Axis Does Not Stop at the PET or CT Positions

If the base axis does not stop at the PET or CT position, perform the following checks:
Check the Table Position Cable, 2338079. Verify that there is 0 ohms between the J8 side (pins 1
and 2) and the relevant terminal on the Positions Microswitch side.
12.3.5

Digits Disappear from Gantry Display

If the digits disappear from the Gantry Display and only three small round LEDs remain, this
indicates an interference problem in the motion mechanism. Perform the following checks:
1.) Verify that no non-table related CT motion interference exists.
2.) Perform the following Base position checks:
a.) Locate the Table somewhere between the CT and PET positions, and verify that table
b.) Disconnect Cable P/N 2338079 on the ETC Interface J8 side, and verify that the two
c.) Reconnect Cable P/N 2338079 on the ETC Interface J8 side, and verify that the two
d.) If the LEDs do not turn Off, measure 20k ohm resistance between Pins 1, 2 and 9, 10 on
3.) While toggling the Positions Microswitch, verify that the green LED (DS13) is blinking.
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power is On.
orange LEDs (DS10 and DS12) on the ETC Interface J8 side are On.
orange LEDs (DS10 and DS12) on the ETC Interface J8 side are Off.
the cable connector.
Chapter 12 - Troubleshooting
D LS S S
ISCOVERY YSTEM ERVICE
M
ANUAL