Strange Noise After Replacing Cap Top on CJV150

[Marcos Duque]

Hi everyone,


I recently replaced the cap top on my Mimaki CJV150, and now there’s a strange noise coming from the machine during operation. Is this noise normal after replacing the cap top, or could it indicate an issue with the installation?


Any advice would be greatly appreciated!


Thanks in advance.

 

[Smoke_Jaguar]

Check to make sure the cap is oriented properly and sitting level. The printhead carriage will bump the capping station during normal operation, but it shouldn't be touching anything but the bump stops on the right-hand side. It shouldn't be bumping the cap itself. They are a bit fiddly to get right, so be patient and note that there might be some adjustment needed.

 

[Marcos Duque]

Hi everyone,


Thank you, especially Smoke Jaguar, for past help.


I’m having several issues with my CJV150 (2017 model) and would really appreciate your insights.

Captop Leveling Problem​

I tried to level the captop but couldn't get it right — I tested both an aftermarket version (which makes noise) and an OEM used one, and neither seals properly.
I changed the components in this order: pump → captop → dampers, but during the damper replacement (1-1/1-2), the connection was extremely tight. Unfortunately, I forced it and damaged the head.


After running a flush, I confirmed magenta is leaking into cyan. Before the flush, I thought the issue was just bad captop contact, as I had completely lost channels 1-1/1-2.

⚠️ SYSTEM HALT Error​

On July 22, 2025 (after the Japanese holiday), I turned on the printer and got this error:


SYSTEM HALT (*)
1b4 : PCB SLDR2H-F2


I replaced the fuse with one from my CJV30 and disconnected the FFC cables from the head. The printer now powers on and can cut fine.

Captop vs Head Level / Jack Adjustment​

From the CJV30 manual, it seems normal for the captop to be lower on the right side.
But in the CJV150 manuals (I have both Rev 1.0 from 2014 and Rev 3.0), the captop appears to be parallel with the head. Can anyone confirm this on their own CJV150?


In my case:

• Carriage Slant is 1.78mm (manual says 1.8mm ± 0.05mm) – so it’s within spec.
• I have a 1.5mm gap on the right side of the captop.
• Jack screw heights:
  • Left jacks: 5.0mm
  • Right jacks: 4.6mm

The manuals don’t clearly state tolerance values.
Rev 1.0 suggests 5.0mm.
Rev 3.0 says cap holder height should be:

• 8.0mm for new version
• 7.5mm for old version

Rev 3.0 also shows measurement points and says to use at least 3 points to define a plane (or 4 for full confirmation).
My machine has the new-style cap holder, and again, it’s a 2017 model. It worked fine for about a month after purchase — then all these issues started.

---

❓ Questions:​

1. Is it normal for the captop to be slightly lower on the right (like CJV30)?
2. Or should it be perfectly level with the head as in the Rev 3.0 CJV150 manual?
3. Should I adjust the jack screws before installing the new head?

I'm planning to buy a new printhead soon, but I want to ensure proper alignment this time.
I chose the CJV150 because I thought the DX5 might be discontinued at any time — but this has been a rough experience. Still, I’m thankful this forum exists and that I can ask for help.


Any support, photos, or tips are very welcome!


Thanks in advance.

CJV30 MAINTENANCE MANUAL
CJV150 Rev1.0
CJV150 Rev 3.0

 

[Smoke_Jaguar]

Based on the error referencing F2, I think you have an internal short circuit inside the head that has blown the fuse. Can try replacing it, but since you have cross-channel flow, you're probably going to blow it again. The caps aren't going to be totally level in most cases, but they are spring loaded and should sit flush and centered when the system is capped.