Topic ID: concept_rmc_xb4_tgb
Version: 1.0
Date: Feb 6, 2020 7:40:58 PM

GT Trouble Shooting

Overview

This instruction is focused on Error Logs which is related to GT table and is considered as difficult to reach the root cause.

So some error logs which are easy to find root cause are omitted.

Table 1. Table Error Messages
Error Code	Message	Explanation	Comment
260125005	Table Communication - Watchdog timeout.	See 260125005 or 244633 or 260125042 section	Reported with no table-related error
244633	Table reports that Table Communication becomes down.
260125042	Communication with the Table failed.
260125034	Did not reboot TCB within 20sec.	See 260125034 section
260125041	Uncommanded Table Motion with the Cradle drive.	See 260125041 (Cradle) section	These errors are not reported by GTCB but TGP.
	Uncommanded Table Motion with the IMS drive.	See 260125041 (IMS) section
	Uncommanded Table Motion with the Elevation drive.	See 260125041 (Elevation) section
260100042	Cradle was NOT ready with table related error	See 260100042 section
260134713	Elevation touch switch1 (tape switches on underside of top front cover) is contacted.	See Tape/Touch SW errors section
260134714	Elevation touch switch2 (switches on underside of top side cover) is contacted.
260134715	Elevation touch switch3 (switch on underside of top rear cover) is contacted.
260134716	Elevation touch switch4 (tape sw on underside of IMS side cover) is contacted.
260134717	Elevation touch switch1 (tape switches on underside of top front cover) isn't present.
260134718	Elevation touch switch2 (switches on underside of top side cover) isn't present.
260134719	Elevation touch switch3 (switch on underside of top rear cover) isn't present.
260134720	Elevation touch switch4 (tape sw on underside of IMS side cover) isn't present.
260134803	IMS tape switch IN (rear) is activated.
260134804	IMS tape switch OUT (front) is activated.
260134805	IMS tape switch IN (rear) isn't present.
260134806	IMS tape switch OUT (front) isn't present.
260134602	Cradle drive torque setting error.	See 260134602 and 260134809 section
260134809	IMS drive torque setting error	See 260134602 and 260134809 section
260134615	Cradle clutch line 1 error.	See 260134615, 260134616, 260134617, 260134623, 260134639, 260134640, 260134813, 260112018, and so on section	Error code is not identified
260134616	Cradle clutch line 2 error.
260134617	Cradle clutch lines are disconnected. Cannot control cradle clutch
260134623	Cradle absolute encoder communication error.
260134639	Cradle clutch line forward 1 is disconnected.
260134640	Cradle clutch line forward 2 is disconnected.
260134813	IMS absolute encoder communication error occur.
260112018	The UIF configuration file does NOT match the configuration of the current table type (PET or CT).
260134703	Elevation moved without command.	See 260134703 section
260134706	Elevation could not move with motion command.	See 260134706 section
260134707	Elevation could not stop with stop command.	See 260134707 section
260134727	Elevation Up velocity is too slow	See 260134727 section

1 Solutions for error code

1.1 260125005 or 244633 or 260125042

“260125005 Table Communication - Watchdog timeout” or “244633 Table reports that Table Communication becomes down”, or “260125042 Communication with the Table failed” which is reported with no table-related error (260134xxx)"

Possible cause

Gantry Switch panel failure → Check “TBL_DRV_ENV” on TGPU B’d. If this LED is turned on without activating Switch Panel, defective Switch Panel is suspected. (Applicable for VCT, VCT HD, and early Brightspeed)
Figure 1. “TBL_DRV_ENV” on TGPU
① “TBL_DRV_ENV” on TGPU
GTCB reset because of instant electric power outage → Check cables
1. 24VDC cables from power supply (24VDC line’s short circuit to frame GND causes instant electric outage and GTCB reset.)
2. cables to Shut-off valve and Proportional valve

①	“TBL_DRV_ENV” on TGPU

1.2 260125034

“260125034　Did not reboot TCB within 20sec.”

Possible Cause

GTCB failure
Table 24V DC Power Supply’s failure
Cable between TGP and GTCB is damaged
Contact failure at Connector

1.3 260125041 (Cradle)

“260125041　Uncommanded Table Motion with the Cradle drive.”

This error is not reported by GTCB but TGP. If cradle is moved by external force and so on after cradle positioning by table firmware, this error is reported.

note:

In almost case, this error is generated when cradle was moved by external force.

Possible cause

Heavy patient’s motion after cradle positioning → Improve patient constraint to reduce patient’s contact to table top cover
Low tension on cradle drive belt → Belt tension adjustment
Sticky motion of cradle linear guide (left side) or roller/rail (right side) → Cleaning & Greasing

1.4 260125041 (IMS)

“260125041　Uncommanded Table Motion with the IMS drive.”

This error is not reported by GTCB but TGP. If IMS is moved by extraction force and so on after finishing IMS positioning by table firmware, this error is reported.

Possible cause

Low tension on IMS drive belt → Belt tension adjustment
Sticky motion of IMS linear guide (left side) or roller/rail (right side) → Cleaning & Greasing

1.5 260125041 (Elevation)

“260125041　Uncommanded Table Motion with the Elevation drive.”

This error is not reported by GTCB but TGP. If table height is changed after table firmware stopped elevation, this error is reported.

Possible cause

Refer to “260134703 Elevation moved without command”.

1.6 260100042

“260100042 Cradle was NOT ready with table related error"

note:

“260100042 Cradle was NOT ready.” alone (without table related error) is not table failure.

Possible cause

Cradle, IMS or Base (PET) could not reach the scan start position. Other table related error would be shown together.
1. For cradle, collision while moving to scan start position is suspected.
2. For IMS or Base (PET), check belt tension, mechanical play, and their encoder function.

1.7 Tape/Touch SW errors

GTCB reports error about “Tape/Touch SW is contacted” or “Tape/Touch SW is not present”, but Tape/Touch SW does not have problem.

Table 2. Examples of error codes
Error code	Error message
260134713	Elevation touch switch1 (tape switches on underside of top front cover) is contacted.
260134714	Elevation touch switch2 (switches on underside of top side cover) is contacted.
260134715	Elevation touch switch3 (switch on underside of top rear cover) is contacted.
260134716	Elevation touch switch4 (tape sw on underside of IMS side cover) is contacted.
260134717	Elevation touch switch1 (tape switches on underside of top front cover) isn't present.
260134718	Elevation touch switch2 (switches on underside of top side cover) isn't present.
260134719	Elevation touch switch3 (switch on underside of top rear cover) isn't present.
260134720	Elevation touch switch4 (tape sw on underside of IMS side cover) isn't present.
260134803	IMS tape switch IN (rear) is activated.
260134804	IMS tape switch OUT (front) is activated.
260134805	IMS tape switch IN (rear) isn't present.
260134806	IMS tape switch OUT (front) isn't present.

Possible cause

Fuse on GTCB is blown → Replace GTCB

1.8 260134602 and 260134809

"260134602 Cradle drive torque setting error" and "260134809 IMS drive torque setting error"

Possible cause

Cable between the motor driver and IMS Cable Bear Assy, or cable in IMS Cable Bear Assy is damaged. → Cable replacement
To check cable function, connecting new cable through outside of the table is effective. If no improvement, then try each part replacement.
Figure 2. Checking cable function (To motor driver)
① To Motor driver

①	To Motor driver

note:

In order to replace the cable between the motor driver and IMS Cable Bear Assy, please follow the below procedure,

Remove "Top Plate"
Open the Cable Duct
Replace the cable

①	Cable duct

1.9 260134615, 260134616, 260134617, 260134623, 260134639, 260134640, 260134813, 260112018, and so on

Error code is not identified, but related to either of the function shown in Figure 4.

Oftenly, GTCB is reset while elevation motion and shows table-related error.

Table 3. Examples of Error code
Error code	Error message
260134615	Cradle clutch line 1 error.
260134616	Cradle clutch line 2 error.
260134617	Cradle clutch lines are disconnected. Cannot control cradle clutch
260134623	Cradle absolute encoder communication error.
260134639	Cradle clutch line forward 1 is disconnected.
260134640	Cradle clutch line forward 2 is disconnected.
260134813	IMS absolute encoder communication error occur.
260112018	The UIF configuration file does NOT match the configuration of the current table type (PET or CT).

Possible cause :

Cable between GTCB J11/J12 and J200/201, or cable in IMS Cable Bear Assy is damaged. → Cable replacement
To check cable function, connecting new cable through outside of the table is quick and easy. If no improvement, then try each function part replacement.
Figure 5. Checking cable function (To GTCB)
① To GTCB

①	To GTCB

note:

In order to replace the cable between GTCB J11/J12 and J200/201, please follow the below procedure,

Remove "Top Plate"
Open the Cable Duct
Replace the cable

①	Cable Duct

Table 4. An example of failure mode which was caused by cable damage
Problem	System scanned different location from localized position. But no error from table was reported.
Cause	Connector pin on cable between J11 and J200 was installed incorrectly, and linear scale position data (serial data) was sent to GTCB incorrectly.

1.10 260134703

"260134703 Elevation moved without command"

Table 5. Error example of "Elevation moved without command"
Error example of "Elevation moved without command"
Elevation moved without command.
If this appears many times, check potentiometer.
Current position = 882940 um → Compare
Last stop position = 870268 um → Compare
Tolerance = 5000 um
Time since last stop = 33200 msec
Cradle position = 1131210 um

1.11 260134706

"260134706 Elevation could not move with motion command"

Possible Cause

<Up operation is not available>
1. 24VDC output from GTCB J2 to inverter assy is not supplied. → Cable or GTCB replacement
2. Power cable from invertor to pump is disconnected. (Motor operating noise can be heard, but table does not raise.) → Cable replacement. As for table raising method, refer to procedure.

<Down operation is not available>
1. Power to shut-off valve or proportional valve is not supplied. → Check cable, Inverter Assy, GTCB (Shut-off valve is driven by GTVS B'd in inverter assy)

note:

If pump power cable is damaged, table is lowered when FE arrives. Lowered table can be lifted by following procedure.

Remove plastic head
A cap screw is found
Rotate motor shaft in CW direction (table is lifted 0.03-0.15mm/rotation)

①	A cap screw head

1.12 260134707

"260134707 Elevation could not stop with stop command"

Possible cause :

Proportional valve damage (Deceleration is delayed when button was released) → Proportional valve replacement
note:
Proportional valve design was improved in 2008, so proportional valve damage is rare now.

POT belt tension is low → Belt tension adjustment (need to check at a several different height)

Table 6. Error example of “low belt tension”
Error example of “low belt tension”
Elevation could not stop with stop command.
If table is moving downward, check valve.
last position = 839525 um → 2nd check point
current position = 840770 um → 2nd check point
commanded direction = UP → 1st check point
time from stop = 1040 ms → 1st check point
1st check point This error was reported just after elevation motion is stopped.(for a few seconds)
2nd check point “Current position” is higher than “last position” after up operation. “Current position” is lower than “last position” after down operation.
These mean that elevation pot was rotated with some delay.

Detect table vibration especially around lowest height only, but no impact to the customer or patient → No GTCB reset although error can be found in error log. No action is necessary.

Table 7. Error example of “table vibration especially around lowest height only”
Error example of “table vibration especially around lowest height only”
Elevation could not stop with stop command.
If table is moving downward, check valve.
last position = 430127 um ←
current position = 429789 um
commanded direction = DOWN
time from stop = 1040 ms ←
This error was reported just after stopping downward motion around lowest height only. (In almost case, less than 500000um)
Error reported around 1sec after stopping motion.

1.13 260134727

"260134727 Elevation Up velocity is too slow"

Possible cause :

Oil level in pump is low → Refill oil
Inverter failure → Inverter Assy replacement