Fixing Paper Jam and Print Job Errors on Comstroll DTF Printers

Question:
I purchased a Comstroll DTF printer from Amazon, and it runs DTG Rip software. Recently, the printer started flashing an error message about a paper jam, even though no paper was loaded—it uses a roll feeder. Then it displayed another error instructing me to delete all print jobs, even when none were pending. Now, the printer won’t pull the roll of paper through. It attempts to feed, but then jerks the paper back out and refuses to print. What could be causing this problem?

Answer:

From what you’ve described, your Comstroll DTF printer is displaying false Paper Jam and Clear Print Jobs errors, followed by feed issues where the roll paper is not being drawn in properly. This kind of behavior is usually related to the printer’s PF (Paper Feed) sensor system or its driver electronics. Let’s go through the possible causes in detail:

1. PF Sensor Misread or Malfunction

The PF sensor is responsible for detecting media movement. If it is dirty, misaligned, or faulty, it can falsely report a paper jam even when no paper is present.

• Fix: Inspect the PF sensor area for dust, dried ink, or debris. Clean gently using a lint-free cloth and isopropyl alcohol. Make sure the sensor is properly seated in its housing. If cleaning does not help, the sensor may need replacement.

2. Driver Board Failure

If the printer has a PF sensor overwrite function, it’s possible that the driver board (not the mainboard) has malfunctioned. When this happens, the printer cannot interpret the sensor signals correctly, leading to feeding errors where the roll is pulled in slightly but then pushed back.

• Fix: Replacing the driver board is usually required in this case. Ensure you get the correct replacement part compatible with your Comstroll model.

3. False Error Code Triggers (Paper Jam / Delete All Print Jobs)

These errors can sometimes appear when the printer’s internal logic cannot reconcile media status with the sensor readings.

• Error Code: Paper Jam – Even though no jam exists, the printer assumes the PF sensor is blocked or misreading.

• Error Code: Delete All Print Jobs – This typically appears when the printer firmware believes a job is stuck in the buffer, even if the print queue is clear. This often points back to faulty signal communication between the PF sensor and the driver board.

4. Roll Feeder and Mechanical Checks

Since your printer uses a roll feeder, ensure the following:

• The roll is correctly aligned and feeding smoothly without excessive resistance.

• No obstructions are in the paper path that could trick the sensor into thinking a jam has occurred.

• The feed motor and gears are not skipping or binding.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. For this reason, we are unable to provide remote step-by-step troubleshooting or repairs. However, BCH Technologies offers an in-person evaluation and repair service (https://bchtechnologies.com/printer-repair-service). Since demand is high, repairs are handled on a first-come, first-served basis, and it may take a few weeks before your printer can be dropped off. We service both complete printer repairs and specific component replacements with clear guidance on next steps.

That said, we understand our rates may not always be the most economical. We encourage you to begin with self-help by researching solutions online. A great starting point is our YouTube channel (https://youtube.com/@bchtechnologies). You can use the search icon next to “About” on the menu bar to quickly locate videos covering PF sensors, driver boards, or error troubleshooting. With over nine years of content, this search method is the most effective way to find the guidance you need. YouTube may also suggest additional videos from other experts that can help.

Thank you again for contacting us. We greatly appreciate your trust and support of BCH Technologies.