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PO-TRY DTF Maintenance & Diagnostic Training
Manufacturer-isolated training material for Charlie - PO-TRY digital printers with Epson I3200-class print
systems
Purpose. This training document teaches Charlie how to use PO-TRY manufacturer evidence without borrowing
Audley-specific settings or procedures, and how to reason safely about persistent white-channel/nozzle faults.
Manufacturer Isolation Rule: Active manufacturer = PO-TRY. Audley specifications, service values, channel mappings,
voltages, waveforms, firmware values, calibration values, and maintenance procedures must not be presented as
PO-TRY evidence. If an exact PO-TRY model-specific value or procedure is not documented, state: UNKNOWN -
PO-TRY-SPECIFIC DOCUMENTATION REQUIRED.

1. Manufacturer-confirmed maintenance guidance
PO-TRY's published digital-printer maintenance guidance emphasizes maintenance before extended shutdowns to
reduce failures, extend machine service life, and support a reliable return to production. The published DTF
maintenance material specifically distinguishes white-ink maintenance from color-ink maintenance.
Step Area Training interpretation
1 Establish machine condition Print test strips / nozzle evidence before shutdown so the machine's starting condition is
documented.
2 Clean maintenance-area
residue
Remove residual ink from the ink-stack / maintenance area and scraper according to the
documented PO-TRY procedure.
3 Store white ink appropriately Return white ink to its bottle for storage when following the published shutdown
procedure.
4 Service the white-ink path The published DTF shutdown guidance calls for cleaning the white-ink path; it
distinguishes this from the color-ink paths.
5 Protect the white printhead Follow the documented PO-TRY procedure for cleaning/protecting the white printhead.
Do not invent chemistry, concentration, or substitute fluids.
6 Protect the capping area Follow the documented procedure for the specified protective/moisture solution and
sealing the printhead against the ink pads/capping area.
7 Secure fluid paths Secure the ink cartridge lid, ink-tube clips, and waste-ink tube as directed in the
published shutdown guidance.
8 Clean and power down Clean the machine and surrounding work area, then disconnect power as directed for the
shutdown procedure.
Important scope limit: The published maintenance guide is general PO-TRY digital-printer / DTF maintenance
guidance. It is not automatically proof of the exact configuration, component revision, electrical value, or service setting
of every PO-TRY model.

2. Persistent white-channel fault reasoning
Example symptom: two white channels remain missing on repeated nozzle checks after multiple cleaning attempts.
This confirms a persistent fault in the affected head/channel/nozzle-output domain. It does not by itself prove a bad
motherboard or a defective I3200 printhead.

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Recommended hypothesis ranking
Rank Hypothesis Why
1 White-ink management /
supply
High priority because the symptom is isolated to white output and PO-TRY's own
maintenance guidance treats the white-ink path as a distinct maintenance concern.
2 Ink-delivery path Investigate tank/lines/dampers/filters, air ingestion, restriction, and delivery stability
using documented procedures where machine-specific action is required.
3 Maintenance station / cap seal Poor capping or maintenance behavior can produce persistent or recurring nozzle loss
and can mimic a head problem.
4 Actual I3200 head/nozzle
failure
Remains possible, but should move upward only after upstream delivery and
maintenance causes are reasonably weakened or direct head-specific evidence exists.
5 Electrical/control path /
motherboard
Requires electrical/control-specific evidence. Failed cleaning alone is not evidence of
motherboard failure.
6 Alignment / calibration Low priority for physically missing channels on a nozzle check; alignment problems
primarily affect placement/registration rather than creating absent nozzle output.

3. Evidence reconciliation rules
Missing nozzles identify a fault domain, not a root cause. A repeatable missing-channel pattern localizes the
problem to the affected output path, but upstream ink delivery, maintenance/capping, the head itself, and
electrical/control causes remain competing hypotheses.
Failed cleaning is not a motherboard test. Repeated cleaning that fails to recover channels does not establish an
electrical/control failure.
Temporary recovery matters. If maintenance restores nozzles and sustained printing causes progressive loss again,
ink-delivery instability/starvation should move upward in the ranking rather than automatically blaming the head.
Before-and-after evidence is high value. If visible air is found in the affected delivery path, the air is removed using a
documented procedure, the nozzle check becomes clean, and sustained production completes without recurrence, the
evidence strongly supports an air-ingestion/delivery fault and moves actual head failure downward.

4. When printhead or motherboard suspicion should rise
Printhead failure: Move this hypothesis upward when the same head-localized nozzle-loss pattern persists after
ink-delivery and maintenance/cap causes have been reasonably investigated using documented procedures, or when
direct head-specific physical/electrical evidence is present.
Electrical/control or motherboard: Move this hypothesis upward only when there is control-specific evidence, such as
documented error information, abnormal channel actuation behavior, connector/cable/control-path evidence, or
documented electrical testing that isolates the control path. Do not invent voltages, pinouts, or waveforms.

5. Post-repair verification
Do not declare success immediately after a corrective action. Stabilize the machine, repeat the nozzle check, reproduce
the original production condition, verify that the original banding/nozzle-loss defect is gone, confirm the applicable QC
target passes, and confirm that no new defect was introduced. Report closure only for the tested conditions.

6. Customer-facing source abstraction

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Charlie may use internal manuals and training material silently, but customer-facing answers must not expose internal
PDF filenames, training-volume names/numbers, knowledge-base categories, document IDs, chunk IDs, vector-store
IDs, storage paths, or retrieval metadata. Refer naturally to 'manufacturer documentation', 'applicable service
documentation', 'validated technical documentation', or 'the product SDS' as appropriate.
Customer response rule: Answer the technical question directly. Do not explain retrieval, grading, source-concealment
checks, internal policies, or training structure unless an authorized administrator explicitly asks.

7. Safety and unknown-value policy
For inks, cleaning chemicals, UV equipment, and maintenance fluids, follow the applicable manufacturer safety
documentation and product Safety Data Sheet (SDS). Do not invent PPE, ventilation, chemistry, exposure limits, fluid
substitutes, or machine-specific service values when the documentation does not establish them.
Unknown-value response: If a PO-TRY-specific setting or procedure is required but not documented for the exact
machine/configuration, answer: UNKNOWN - PO-TRY-SPECIFIC DOCUMENTATION REQUIRED.
Source basis
This training document is based on PO-TRY's published digital-printer maintenance guidance supplied for this training session, plus general
DTF/I3200 diagnostic reasoning. General reasoning is not a PO-TRY factory specification.