Mimaki 3042 HG Main pcb q6 check

[Rista6969]

Hello,
we have a problem with Mimaki that wasn’t used for few months. It has a “Main pcb q6 check error)
Error 172. Can it be something else or is it 100% board change needed? Printer works (table and vacuum), goes to pumple cycle every few hours

Is there a way to try and fix the board? We can’t try print test yet for few days until new cartridges arrive.

 

[Ewan yu]

How long have those cables been in use?

 

[Smoke_Jaguar]

It's a generation 1 UJF, so probably going to be in pretty rough condition. Starting to see all kinds of failures on those, bad capacitors being the big thing.

 

[Rista6969]

How long have those cables been in use?

You mean head cables? Proabably 5+years

It's a generation 1 UJF, so probably going to be in pretty rough condition. Starting to see all kinds of failures on those, bad capacitors being the big thing.

Machine is in very good condition, it wasnt used a lot.

 

[netsol]

You mean head cables? Proabably 5+years



Machine is in very good condition, it wasnt used a lot.

That’s not always good news

 

[Rista6969]

That’s not always good news

Yeah, I know. We are ready for a lot of repairs.

 

[netsol]

It's a generation 1 UJF, so probably going to be in pretty rough condition. Starting to see all kinds of failures on those, bad capacitors being the big thing.

My word of encouragement would be that low hours probably means mechanical failures FROM SITTING.
seals dry out, flat spots on rollers. CAPACITORS weould make out pretty well if machine was POWERED OFF.
either way he should learn what an ESR meter is. That technology finds bad and marginal caps.

 

[Rista6969]

My word of encouragement would be that low hours probably means mechanical failures FROM SITTING.
seals dry out, flat spots on rollers. CAPACITORS weould make out pretty well if machine was POWERED OFF.
either way he should learn what an ESR meter is. That technology finds bad and marginal caps.

Machine wasn’t unpowered. It just wasnt printing for few months to a year.

Will check out ESR meter. So that PCB Q6 error could be from bad capacitor I guess.

 

[netsol]

ESR is equivalent series resistance.
as a cheaply made capacitor ages, the electrolyte evaporates or oozes out a vent hole. You often see a stain on the pcb.

This is the most common way a cap will fail. Sometimes the top of the cap “crowns” but often no visible sign.
this does 2 things. Power supplies get ripple (noise on the power voltage) which causes excessive heat

ESR also throws off critical timings and adjustments since r/c time constants go all to hell.

 

[dudeinthemoon]

Q6 should be a mosfet. Unfortunately I don't have a UJF main, it was unique for the model, all next models have unified epl pcb. But on original old main Q6 is a mosfet on the back side of the pcb and most likely it supplies X, Y or Z motor.
In the manual it says that this error will pop-up only in case if the SUPPORT parameter is set to 2. This transistor will probably be IRFR024N, its pretty cheap and shouldn't be hard to replace.