ProcedureCouch/TableReplacement/FRUReplace

Replace the couch horizontal (longitudinal) drive unit

Remove and replace the horizontal drive unit — the assembly that drives the couch top's IN/OUT travel, and which Step 5's own text also calls the longitudinal movement drive unit (see Related: longitudinal-drive theory, for the M11 motor / clutch brake / belt train this replaces). This task also covers replacing the servo amplifier (Step 6), which shares the same access covers as the drive-unit re

Applies to

Activion16 (TSX-031A). Section 2.1 notes the couch descriptions in this manual default to the CBTB-018A couch, with call-outs added elsewhere for CBTB-018B differences; §2.5.2 itself carries no CBTB-018A/018B distinction, so this drive-unit replacement is treated as common to both couch variants.

Personnel

1 technician · Field service engineer (CT couch mechanical service — belt/pulley work, encoder/idler/brake-lever hardware transfer, servo amplifier R&R)

Steps

6 steps

Source

2D201-112EN*D §2.5.2 (pp.142–148) — Replacement of the horizontal drive unit

Tools & parts

Item	Part number	Qty
Horizontal drive unit (replacement assembly) — same physical unit Step 5's text calls the "longitudinal movement drive unit"	n/a in source	1
Horizontal drive unit mounting screws	n/a in source	4-M8
Encoder	n/a in source	1
Idler(s)	n/a in source	Step 4's note says "idler pulley" (singular); the Step 5 figure shows two separate "Idler" labels
Brake release lever handle	n/a in source	1
Belt (contains fiber)	n/a in source	1
Servo amplifier unit (replacement)	n/a in source	1
Servo amplifier mounting screws	n/a in source	2
Servo amplifier cover screw(s)	n/a in source	not specified in source
Access covers/hardware (Steps 1 and 6a)	n/a in source	see note

Safety

WARNING

Hazard: Starting this procedure without isolating power at the distribution board

Consequence: Electric shock, or unexpected couch-drive motion, while disconnecting cables from the drive unit (Step 3) or the servo amplifier (Step 6b), or while removing the drive unit / servo amplifier itself

Avoidance: Turn OFF system power at the distribution board (safety library G-W01) before starting any part of this procedure

NOTE

Hazard: The horizontal drive unit weighs approximately 20 kg and can fall once its 4-M8 mounting screws are freed (Step 4)

Consequence: The drive unit can fall accidentally during removal

Avoidance: Place the drive unit on a suitable support, such as a chair, as it comes free

CAUTION

Hazard: Bending the belt once it is off the belt fixing plate (Step 2)

Consequence: The belt will not function normally if bent — it contains fiber

Avoidance: Do not bend the belt; handle it carefully once removed

CAUTION

Hazard: Applying excessive force to the brake release lever while installing the brake release lever handle (Step 5)

Consequence: The brake release lever may be damaged

Avoidance: Install the brake release lever handle onto the lever without forcing it

Full step-by-step for Replace the couch horizontal (longitudinal) drive unit

All 6 steps are documented in the FSELIB Activion16 (TSX-031A) service manual — re-authored, web-first, with the real figures from the source.

Open the full procedure

Related Couch/Table guides

Adjust the couch descent (lowering) speed — solenoid throttle valves L21/L245 steps Adjust the couch height display6 steps Adjust the couch-top longitudinal belt tension6 steps Adjust the couch-top supporting rollers (height, level, and sway)8 steps Change the patient couch vertical stop positions2 steps Check the couch-top (horizontal) travel speed4 steps

View all Activion16 (TSX-031A) guides

Source: 2D201-112EN*D §2.5.2 (pp.142–148) — Replacement of the horizontal drive unit. Preview re-authored by FSELIB — the full procedure with figures and steps is in the paid service manual.