HP OfficeJet Pro 8022 "Paper Jam" Error with Carriage Stuck Left: How to Check the Clear Encoder Strip and Timing Belt

Question: My HP OfficeJet Pro 8022 shows a "paper jam" error, but I already disassembled it and didn't find any jammed paper. I also noticed the printhead/carriage stays on the left and won't move correctly-if I slide it to the right, it returns to the left and stays there. Could that be the cause, and how can I fix it?

Answer: 

Now, to your symptoms: a "paper jam" message with no paper found, plus the carriage/printhead assembly stuck on the left is very often not a real paper jam. On many HP OfficeJet models (including the 8020/8022 family), the printer may throw a generic paper-jam style warning when it detects the carriage system can't initialize or the paper path sensors never reach their expected state because the carriage is "crashing" to home and failing to travel.

Why the carriage stuck on the left matters

When the printer powers on, it runs a startup sequence:

1. The carriage moves away from the left "home" position,

2. The printer reads the carriage position continuously,

3. The printer confirms that motion is smooth and within expected timing.

If it can't read position or the carriage can't travel, the printer may stop and show a paper-related error even though there's no paper jam-because the startup process depends on multiple moving parts and sensors.

Most likely cause (matches your proposed answer): the clear encoder strip isn't being read correctly

Your proposed fix is exactly where I'd start:

Check the clear "belt/strip" (CR encoder strip) and/or the timing belt, and make sure it is properly threaded through the carriage's encoder sensor (the CR encoder sensor).

Here's what that means in practical terms:

1) Identify the two "belts" people commonly mix up

On these printers there are usually two different things that get called a "belt":

• CR encoder strip (clear strip / encoder film):
  A thin, clear plastic strip that runs horizontally behind the carriage. It usually has very fine markings on it. The carriage's encoder sensor "reads" those markings so the printer knows exactly where the carriage is.

• Timing belt (drive belt):
  A toothed belt attached to the carriage that the motor uses to physically move the carriage left/right.

Your symptom-carriage goes back to the left and stays there-often happens when:

• The printer can move the carriage, but it cannot accurately detect carriage position, so it "homes" left and refuses to proceed.

• Or the carriage drive belt is slipping/binding and the printer aborts movement.

2) Check the clear encoder strip (CR encoder strip) first

This is the most common hidden culprit after disassembly, cleaning, or a hard paper jam.

What to check:

• The clear strip must be straight and under light tension across the printer.

• It must pass through the slot in the CR encoder sensor on the carriage.

• The strip must be centered in that sensor slot-not riding above it, below it, twisted, or popped out.

• Make sure the strip is not smeared with ink/grease/fingerprints.

Why it causes your exact problem:

• If the strip is out of the sensor or too dirty to read, the printer doesn't know where the carriage is. Many HPs will then slam/return to the left (home), stop moving, and throw an error that can present as a jam message.

Cleaning (gentle):

• Use a lint-free cloth lightly dampened with water or isopropyl alcohol.

• Wipe the strip lengthwise gently (do not pull it hard, do not crease it).

• Avoid scratching-those fine markings are what the sensor reads.

Re-seating tip:

• With power off, gently guide the strip so it sits in the carriage encoder sensor slot.

• Make sure it stays in the slot as you slide the carriage slowly left/right by hand.

3) Inspect the timing belt and carriage travel

If the encoder strip is perfect and correctly threaded, the next check is the drive system:

• Look for a loose belt, missing teeth, or belt not seated on the motor pulley.

• Check if the carriage binds mechanically: dried ink, broken plastic, debris on the slide rod, or a twisted service station area can create resistance.

• If the carriage "springs" back left, it can be the printer repeatedly trying to re-home because it detects movement is abnormal.

Basic mechanical sanity checks:

• Power off and unplug.

• Manually slide the carriage left/right. It should move smoothly with consistent resistance.

• If it catches or grinds at a certain point, inspect that area for obstructions or a misaligned guide.

4) Don't overlook the service station area (left side)

Since the carriage is stuck left, check the service station/capping area (where the carriage parks). If that assembly is jammed or incorrectly reassembled, it can physically prevent the carriage from moving out of home position.

Common issues:

• A stuck wiper/cap mechanism

• A spring out of place after disassembly

• Hardened ink buildup

About "paper jam" errors with no paper present

Even when the message says "paper jam," the underlying problem may be:

• Carriage can't initialize (encoder strip/sensor issue)

• Service station jam

• Drive belt issue

• Paper path sensor flag stuck (less likely if carriage is clearly misbehaving)

So yes-the carriage staying left can absolutely be the root cause, and the CR encoder strip threading/position is one of the best places to start.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems, and the same symptom can be caused by more than one physical fault. Because of that, we're not able to provide remote troubleshooting, suggestions, or support for printer repairs. We do offer an in-person evaluation and repair service through our local diagnostic facility: printer repair service (https://bchtechnologies.com/printer-repair-service). Given the high demand, we operate on a first-come, first-served basis, so it may take a few weeks before we can schedule your printer for drop-off. Our services are structured to repair either a whole printer or specific parts, with clear instructions on how to proceed. However, we acknowledge that our rates aren't the most economical. Thus, we highly recommend that you resort to self-help via online research. You can start by checking out YouTube or visiting our YouTube channel's homepage: BCH Technologies on YouTube (https://youtube.com/@bchtechnologies). Look for specific videos using the search icon next to "About" on the right-hand side of the menu bar. I receive dozens of queries every day asking about videos for specific topics. Having created videos over the past nine years, it's challenging to remember every single one. Therefore, using YouTube's search function is the most efficient approach. Plus, YouTube may suggest relevant videos from other channels that could assist you as well.

Thanks again for reaching out, and thank you for supporting our work and the channel. I hope checking the clear encoder strip (CR encoder strip) and making sure it's correctly seated through the carriage encoder sensor gets you moving again and clears that "paper jam" message.