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Message: [QUOTE="hashwood, post: 232426, member: 28591"] Hello, I am looking for some advices on repairing a canon pro 1000? [HR][/HR] [B]Canon PRO-1000 – looping, 5C13/5C14/5100 after service work (MC-20, purge unit, HMS, encoder) Symptoms (chronological):[/B] [LIST] [*]Initial fault: [I]“Maintenance cartridge full (MC-20)”[/I]. [*]After clearing that, got [B]5C14[/B] (non-ejection detected) and intermittent [I]paper jam[/I] with no paper. [*]Printer often stuck on [B]“Processing… please wait”[/B] with repeated cleaning/priming and carriage oscillation ~10–15 cm on the right side. [/LIST] [B]What I did:[/B] [LIST] [*][B]MC-20 / counters:[/B] Hardware-wrote the EEPROM to clear the MC-20 status. Later physically drained the MC-20 (it weighed [B]531 g[/B], then climbed to [B]599 g[/B] during loops). (I will replace with a new one, as it's cheap) [*][B]Purge unit / waste path:[/B] Cleaned wipers, capper and spittoon; verified pump direction; [B]primed the waste lines[/B] (spittoon → pump → MC-20) by rotating the pump [B]CCW[/B] so it actually moves fluid to MC-20. [*][B]Capper/wiper:[/B] Capper leaves a uniform wet imprint; wipers clean; cam cycles correctly. [*][B]Encoder system:[/B] Thoroughly cleaned the [B]encoder strip[/B] (especially right 10–15 cm) and the [B]carriage encoder sensor slot[/B]; confirmed band runs centered in the sensor and is dry. [*][B]Carriage rail:[/B] I removed the carriage; the [B]upper rail[/B] was loosened. Realigned it using the factory emboss marks/“sights” (as per service manual) so rail height is back to spec and parallel, then retightened progressively. [*][B]Head Management Sensor (HMS):[/B] Removed/cleaned the HMS window/lens, platen area in front of it, and reseated the harness. Tried centering, then slight up/down adjustments in its slotted mount. [/LIST] [B]Errors seen:[/B] [LIST] [*][B]5C14[/B] earlier (cleared after cleaning/priming). [*][B]5100[/B] after reassembly (carriage positioning). [*]After long oscillation, [B]5C13[/B] (HMS position adjustment error). [*]Odd behavior: the printer [B]booted when HMS was unplugged[/B], but later also looped even with HMS unplugged—so the failure is borderline/intermittent. [/LIST] [B]Current status:[/B] [LIST] [*]With everything assembled, the machine sometimes boots, other times loops on the right and eventually throws [B]5C13[/B]. [*]Capper imprint is good; pump moves waste; MC-20 weight increases during cleaning; encoder strip/sensor are clean and dry; CR-HOME appears to switch. [*]HMS looks physically clean; harness reseated; height/rail re-aligned. [/LIST] [B]Ask / next checks:[/B] [LIST=1] [*]Any known [B]HMS harness[/B] failures on PRO-1000 that cause intermittent 5C13/5C14? Worth replacing HMS + cable as a set? [*]Tolerance tips for [B]HMS slotted adjustment[/B] or [B]carriage upper rail[/B] height that typically clear 5C13? [*]Other causes of [B]right-side carriage looping[/B] after ~30–60 s even when encoder looks good (e.g., relay PCB, CR-HOME alignment spec, pinion grub screw slipping)? [/LIST] Any pointers to lock this down are appreciated. I also made a video [MEDIA=youtube]-ivquwVbQc8[/MEDIA] [/QUOTE]

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