HP Color LaserJet M570 Repair: ITB Failures, Streaking & Black Lines

From 6,900+ HP repairs across our network, one pattern stands out in color LaserJet workgroup printers: intermediate transfer belt (ITB) failure is almost never a standalone event. On the M570dn specifically, a failed toner collection unit (TCU) is frequently the silent accomplice — backing waste toner into the ITB system and contaminating the belt surface long before the printer throws a definitive error. This guide explains the failure chain, what your output is trying to tell you, and what a proper repair actually involves.

How the ITB Fits Into the M570's Color Engine

The intermediate transfer belt is the M570's color-assembly backbone. During a print cycle, all four toner colors — cyan, magenta, yellow, and black — are laid down in sequence onto the ITB surface. The belt then transfers the complete composite image to paper in a single pass through the second transfer roller.

Two things have to work perfectly for clean output: the belt surface must be free of contamination, and the toner collection unit must continuously remove residual toner from the belt after each transfer. If the TCU's collection auger jams, its seal fails, or its waste bin overflows, toner stops being swept off the belt. That residue bakes into the belt surface under heat and pressure, leaving the grooves and scratches that produce persistent black lines and color streaking.

This is why output defects often appear gradually on the M570 — faint at first, then worsening over weeks — rather than appearing suddenly. The contamination accumulates incrementally until the surface is too compromised to transfer cleanly.

Reading the Output: What Your Prints Are Telling You

Before pulling any covers, run a few diagnostic pages. The M570's built-in print quality troubleshooting pages (accessible from the control panel under Reports) isolate whether a defect is toner-related, belt-related, or drum-related. Here is what each pattern points to:

Repeating black lines across the full page width — almost always ITB surface damage. Measure the repeat interval. The M570 ITB circumference means defects repeat roughly every 75–76mm. If your lines repeat at that interval, the belt is the source.

Streaking limited to one color — suspect the imaging drum or developer unit for that color first. On the M570dn calls in our records, magenta imaging issues accompanied the ITB contamination in one case, pointing to simultaneous drum wear alongside belt contamination.

Streaking across all colors, especially after recent toner changes — strongly suggests TCU overflow or seal failure. A full or failed TCU is often triggered by a high-yield cartridge cycle pushing more waste volume than the collection system can handle at end-of-life.

ADF-related streaking on scanned copies — a separate failure path. On the M570dn, the ADF separation roller and pickup roller wear independently of the print engine. If streaking appears only on copies (not direct prints), the ADF roller kit is the starting point, not the ITB. See our guide on why laser printers get paper jams for a deeper look at roller wear patterns.

The TCU-to-ITB Failure Chain, Step by Step

Understanding the sequence matters because it determines the correct repair scope. Skipping a step almost always means a callback.

1. TCU seal degrades or waste bin fills. Residual toner from the belt surface stops being collected effectively. This happens silently — the M570 does not always generate an immediate alert.
2. Waste toner back-migrates onto the ITB. The contamination is distributed across the belt width, which is why the resulting lines typically span the full page rather than appearing only in a narrow column.
3. Baked-in contamination scores the belt surface. Heat from repeated print cycles bonds the toner residue. Cleaning alone cannot restore the surface at this stage.
4. Second transfer roller picks up contamination. If the belt runs long enough in a contaminated state, the second transfer roller and transfer roller cleaner also accumulate debris. Both components need inspection at belt replacement time.
5. Output defects become visible and permanent. At this point, only belt replacement plus TCU replacement resolves the issue. A new TCU is non-negotiable — installing a fresh ITB against a failed TCU restarts the same failure clock.

M570 ITB Replacement: What the Repair Actually Involves

The ITB on the M570 is accessed by removing the right-side cover and swinging out the imaging carousel. The belt assembly slides out on guides — straightforward in design, but the alignment tabs are fragile. Forcing the assembly is the most common installation error and causes immediate belt-edge damage.

Parts involved in a complete repair:

• ITB assembly (HP part CE516A for the M570dn — verify against your exact serial number range before ordering)
• Toner collection unit (CE254A or equivalent for the M570dn)
• Second transfer roller — inspect for contamination; replace if toner is embedded in the rubber surface
• ADF roller kit if ADF-related streaking was part of the complaint

The ITB exchange process: HP supplies the M570 ITB as a customer self-replaceable (CSR) exchange unit through authorized channels. The box includes a prepaid return label for the defective core. The return must be completed within the window specified on the label — typically 15 days — or HP charges for the exchange unit at full price. Keep the packaging from the new unit; the old ITB ships back in that same box. This process applies whether the unit was purchased through HP directly or through a channel partner.

Post-installation calibration: After seating the new ITB and TCU, run a full calibration cycle from the control panel (Administration > Print Quality > Calibrate Now). The M570 needs to re-map color alignment to the new belt surface. Skipping calibration often leaves residual color registration errors that look like a second defect — and generates unnecessary callbacks.

M551 and M577 fleet note: The M570 shares its ITB failure mechanism with the M551 (mono/color variants) and the M577. If you run a mixed fleet with these models, apply the same TCU-first inspection logic across all three. A TCU that is approaching end-of-life on an M551 in your fleet will follow the same failure path.

When It's Time to Call a Technician

Some M570 ITB jobs are within the reach of an experienced IT administrator. Others are not. The line is usually drawn by what else is failing alongside the belt.

• Black lines or streaking have not resolved after replacing the ITB and TCU — second transfer roller or imaging drum contamination is likely.
• The printer is generating 50.x fuser errors alongside print quality defects — the contamination may have reached the fuser assembly.
• Magenta or other color channels are streaking independently of the belt issue — imaging drums need individual inspection.
• The ADF is misfeeding or producing document-streaking on copies in addition to the print engine issues — the ADF roller kit replacement requires disassembly that varies by M570 sub-model.
• The printer has exceeded its recommended monthly duty cycle consistently — belt life is significantly shortened under heavy use, and other wear components are likely overdue simultaneously.

When the repair scope expands beyond the ITB and TCU, the diagnostic time alone justifies professional service. PRG technicians carry the M570 ITB assembly, TCU, and second transfer roller as standard van stock in most markets. On-site HP printer repair is typically scheduled within one business day across our 70+ city network.

Frequently asked questions

Can I clean the M570 ITB instead of replacing it?

Not once surface scoring has occurred. Dry cleaning cloths and isopropyl alcohol can remove loose surface toner, but they cannot reverse physical abrasion to the belt substrate. If cleaning eliminates the lines, the contamination was superficial and the belt may still have life. If lines return within a few hundred pages, the belt surface is scored and replacement is the only durable fix.

How long does an M570 ITB typically last?

HP rates the M570 ITB for approximately 150,000 pages under normal operating conditions. In practice, units running at or above the recommended monthly volume, or those that have experienced a TCU failure, often present belt issues significantly earlier. Track page counts from the Configuration page (Administration > Reports > Configuration Page) and treat 120,000 pages as a proactive inspection trigger if print quality is the priority.

Does the M570 warn you before the ITB fails?

Inconsistently. The M570 monitors ITB life by page count and will generate a "Transfer Belt Low" message near the rated end-of-life threshold. It does not directly detect contamination caused by TCU failure. This means TCU-driven ITB damage often occurs without a preventive alert — the first indication is degraded output, not a control-panel message.

Are aftermarket ITB assemblies reliable on the M570?

Our technicians use OEM HP assemblies for the M570 ITB. Aftermarket belts vary significantly in substrate quality, and the exchange program HP offers for the OEM unit makes the price delta smaller than it appears. An aftermarket belt that fails prematurely costs more in labor than the price difference. If budget is a constraint, refurbished OEM units from reputable sources are a better option than generic aftermarket assemblies.

What is the M570dn ADF roller kit, and when does it need replacing?

The ADF roller kit for the M570dn includes the separation roller, pickup roller, and associated pad. These wear independently of the print engine and typically present as ADF misfeeds, multi-feeds, or streaking on scanned copies. HP recommends inspection around 50,000 ADF cycles. If your M570dn is producing clean direct prints but streaking copies, start with the ADF kit before opening the print engine.