Automated Table Operation Issues; Clutch Fails To Engage/Disengage - GE Discovery LS System Service Manual

GE H
EALTHCARE
D 2307224-100, R
IRECTION EVISION
12.3

Automated Table Operation Issues

This section contains a list of problems that may be encountered during operation of the Discovery
LS Automated table, suggests their likely causes, and the action that can be taken to rectify the
problem. A summary of the issues is presented in the table that follows, and more detailed
explanations are given in the sections that follow.
CAUTION IN ALL THE PROCEDURS DESCRIBED IN THIS SECTION, IT IS ESSENTIAL THAT THE
SERVICE ENGINEER USES ONLY THE PROPER EQUIPMENT AND TAKES ALL THE
NECESSARY PRECAUTONS TO PREVENT POSSIBLE INJURY TO PERSONNEL AND
DAMAGE TO EQUIPMENT.
Problem
Clutch fails to engage/
disengage.
Base axis does not move.
Base axis motion
malfunction.
Base axis does not stop at
the limit switch and collides
with mechanical stopper.
Digits disappear from
Gantry Display.
12.3.1

Clutch Fails to Engage/Disengage

If the clutch fails to engage or disengage, perform the following checks:
1.) Check whether the E-Stop circuitry was activated. The green LEDs on the gantry control
panels will be blinking.
a.) E-Stop activation causes clutch to be disengaged. Release the E-Stop button.
b.) If the problem persists, proceed to
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6
Likely Cause
• E-Stop circuitry activated.
• Blown fuse in Clutch Driver Unit
(CDU).
• Faulty CDU supply cable
connection.
• Faulty clutch control signal cable
connection.
• Faulty clutch power cable
connection.
• Clutch not engaged.
• Base stuck in CT position.
• Elevation Tilt Amplifier malfunction.
• E/T or ETC control loop of the
amplifier malfunction.
• Faulty connections of Table Position
cable.
• Faulty Table Position Cable.
Chapter 12 - Troubleshooting
D
ISCOVERY
Suggested Action/
Replace if Necessary
• Release E-Stop button.
• Replace fuse. (CDU replacement
may be necessary, see Section
12.2.1.)
• Connect cable properly.
• Connect cables properly. (For
flowchart see
• Check CDU.
• Check if Solenoid is stuck. (For
flowchart see
• Refer to LightSpeed Service
Manual.
• Connect Position cable properly.
(More details in Section 12.2.5.)
• Repair/replace Table Position
Cable.
Step 2 below.
LS S S M
YSTEM ERVICE ANUAL
Figure 12-8.)
Figure 12-10.