GE Discovery LS - Section 12.3 Automated Table Operation Issues; 12.3.1 Clutch Fails to Engage;Disengage

GE HEALTHCARE
DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL
Page 322 Chapter 12 - Troubleshooting
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.
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 Step 2 below.
Problem Likely Cause
Suggested Action/
Replace if Necessary
Clutch fails to engage/
disengage.
• 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.
• 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 Figure 12-8.)
Base axis does not move. • Clutch not engaged.
• Base stuck in CT position.
• Check CDU.
• Check if Solenoid is stuck. (For
flowchart see Figure 12-10.
Base axis motion
malfunction.
• Elevation Tilt Amplifier malfunction.
• E/T or ETC control loop of the
amplifier malfunction.
• Refer to LightSpeed Service
Manual.
Base axis does not stop at
the limit switch and collides
with mechanical stopper.
• Faulty connections of Table Position
cable.
• Connect Position cable properly.
(More details in Section 12.2.5.)
Digits disappear from
Gantry Display.
• Faulty Table Position Cable. • Repair/replace Table Position
Cable.