ProcedureDASReplacement/FRUReplace

Replace the DAS PWB (Converter-16 / Control-16)

Remove and remount a printed wiring board (PWB) inside the DAS chassis on the Activion16 gantry — either a Converter-16 or the Control-16 PWB (or, on the CDAS-035A/2A generation, the equivalent AJ-CONVERTER / AJ-CONTROL PWB). The procedure is identical for both DAS generations and for either PWB type.

Applies to

Activion16 (TSX-031A). Covers both data-acquisition-section generations: CDAS-035A/1A (Converter-16 / Control-16 PWBs, §2.9.2, pp.204-205) and CDAS-035A/2A 'AJ' (AJ-CONVERTER / AJ-CONTROL PWBs, §2.17.2, pp.298-299) — the procedure text is identical between the two except for which PWB family is physically fitted. Confirm which generation is installed per §2.1 Introduction (toshiba-ct-activion16-das-reference-cdas-version-identification) before working.

Personnel

1 technician · Field service engineer (CT DAS / gantry electronics)

Steps

7 steps

Source

2D201-113EN*J §2.9.2 'Replacement of the DAS PWB (Removing and remounting a PWB)' (pp.204-205, CDAS-035A/1A) and §2.17.2 (pp.298-299, CDAS-035A/2A/AJ — verbatim repeat, nav-only in the coverage ledger, folded into this atom)

Tools & parts

Item	Part number	Qty
Standard tool set	n/a in source	1 set
Antistatic mat	n/a in source	1 (quantity not stated)
Clean gloves	n/a in source	1 pair (not stated as cotton in this section; §2.8.1 specifies cotton gloves for the same PWB-handling context)
Wrist band (antistatic/ESD wrist strap)	n/a in source	1
DAS PWB, replacement (Converter-16 or Control-16; AJ-CONVERTER or AJ-CONTROL for the CDAS-035A/2A generation)	n/a in source — see Replacement Parts List (per §2.9.1/§2.17.1)	1 (or more, per defective PWB(s))

Safety

CAUTION

Hazard: Opening the gantry front cover (step 1) without turning OFF the circuit protector switch

Consequence: The DAS remains ON (energized) even though the front cover is open — source does not spell out the resulting injury beyond "the DAS remains ON"; this precedes disconnecting system power in step (3) and directly handling PWBs in steps (5)-(6), consistent with the electric-shock rationale behind the general breaker-OFF policy (see DAS-W01/DAS-W02, related)

Avoidance: Be sure to turn OFF the circuit protector switch when opening the front cover of the gantry

NOTICE

Hazard: Touching the parts of the DAS PWB or its pattern (circuit) surface with hands or another object while replacing it (step 6), or soiling it with oil, water, etc.

Consequence: The SD (a DAS channel image-quality/noise metric named elsewhere in this manual's DAS troubleshooting sections, e.g. §2.8.5/§2.8.6, but not spelled out in this section) may be made worse

Avoidance: Be careful not to touch the parts of the DAS PWB or the pattern surface with your hands or other objects

Full step-by-step for Replace the DAS PWB (Converter-16 / Control-16)

All 7 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 DAS guides

Check the DAS supply voltage (AJ-CONTROL / AJ-CONVERTER PWBs)3 steps Check the DAS supply voltage (Control-16 / Converter-16 PWBs)3 steps DAS gain-dependent abnormality — reading the GAIN/odd-even-view pattern (§2.8.5)4 steps DAS integrator-dependent abnormality — odd/even-view fault pattern (Integ-A / Integ-B)0 steps DAS/detector troubleshooting — slice thickness-dependent (row-dependent) abnormality7 steps Data acquisition faults — cause × symptom matrix and 4 isolation flowcharts (DAS)8 steps

View all Activion16 (TSX-031A) guides

Source: 2D201-113EN*J §2.9.2 'Replacement of the DAS PWB (Removing and remounting a PWB)' (pp.204-205, CDAS-035A/1A) and §2.17.2 (pp.298-299, CDAS-035A/2A/AJ — verbatim repeat, nav-only in the coverage ledger, folded into this atom). Preview re-authored by FSELIB — the full procedure with figures and steps is in the paid service manual.