Hp designjet 4520 86-01 code

[Massimo Italy]

Re: Hp designjet 4520 86-01 code

hello everybody,
i'm going crazy about this problem ..
I state that the plotter worked but had the belt at the end of its life, I advised the customer to wait for the replacement and not to use the plotter but he continued and the belt frayed and wrapped in the tensioner ..
Then when the new belt arrived I went to replace it and from that moment the problem of the first post occurs continuously.
I cleaned the motor pulley and oiled the guides.
The carriage moves freely with the hands but stops following a slight vibration when it is pulled by the motor.
I replaced the encoder strip and sensor with no improvement.
If I loosen the tension of the belt the carriage reaches the right but when it restarts quickly to the left it re-locks.
The bushings remain to be replaced, but I have never had to do it, not even on the most worn out machines, moreover it worked perfectly before...
Any suggestion?

Thanks in advance, Massimo

ps. the other plotter of my first post has been collected and replaced at the customer and is in stock awaiting treatment, I must follow the advice received.

[theengel]

Re: Hp designjet 4520 86-01 code

If the carriage has a lot of resistance, maybe. Usually, if you're replacing the belt, then you clean and lube the rail while you have it off. But it's probably the encoder strip.

[Kiran Otter]

Re: Hp designjet 4520 86-01 code

Encoder strip would be my guess. The motors rarely ever fail. See my other post: What a damaged encoder strip looks like from a Designjet

It's very easy to miss the damage to the encoder strip.

Kiran

[1stcavvet]

Customer said it would do this every once and awhile----Of course ----Called me to replace the shredded carriage belt, Put the belt on start it up goes thru initialization and comes back to the right and stops dead about a foot from the service station 86-01 possible paper jam. tried it a couple more times after checking that the tubes weren't catching cleaned the encoder and still comes to a halt about a foot from the service station I see it move to the right while initializing then to the left and cleaners move and as the carriage come from the left back to the service station it stop a foot from the the station. I was thinking encoder but the the customer tells me it happens a lot I think it might be the motor to much resistance?? anyone have any ideas lack of lubrication maybe???