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computers / alt.sys.pdp11 / Re: problem with a RL01 drive

problem with a RL01 drive

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Date: Wed, 25 May 2022 11:46:34 -0700 (PDT)
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Subject: problem with a RL01 drive
From: mikeschpdp@gmail.com (Mikesch)
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by: Mikesch - Wed, 25 May 2022 18:46 UTC

Hello,
I've a RL01 drive with the following errors:

Pressing LOAD SpinUp starts and after approx. 20 sec FAULT light went on - heads don't go in!

Posit.systems works (without cardtridge) retracks to track 0 strong on manual leaving track zero and emergency retracktion works.

Here is the another problem:

Also at standstill the Posit.system is getting very hot (takes 15 min) and you can smell a little bit electric.

DC servo power voltages 5V +/- 8V are ok but +V and -V are only 13,87 V - that's to low should be greater 14 Volts.

Changed the DLM from another drive - same result with FAULT after spinUp. The DLM works fine in my other drive.

I'm looking for a spare DC servo board in my storage tomorrow.

Any idea's what's the reason for this error?

regards

Michael

Re: problem with a RL01 drive

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Subject: Re: problem with a RL01 drive
From: mikeschpdp@gmail.com (Mikesch)
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by: Mikesch - Thu, 26 May 2022 11:03 UTC

Mikesch schrieb am Mittwoch, 25. Mai 2022 um 20:46:35 UTC+2:
> Hello,
> I've a RL01 drive with the following errors:
>
> Pressing LOAD SpinUp starts and after approx. 20 sec FAULT light went on - heads don't go in!
>
> Posit.systems works (without cardtridge) retracks to track 0 strong on manual leaving track zero and emergency retracktion works.
>
> Here is the another problem:
>
> Also at standstill the Posit.system is getting very hot (takes 15 min) and you can smell a little bit electric.
>
> DC servo power voltages 5V +/- 8V are ok but +V and -V are only 13,87 V - that's to low should be greater 14 Volts.
>
> Changed the DLM from another drive - same result with FAULT after spinUp. The DLM works fine in my other drive.
>
> I'm looking for a spare DC servo board in my storage tomorrow.
>
> Any idea's what's the reason for this error?
>
> regards
>
> Michael

Done!

Got the RL01 up and running.

Causes:

Home sensor with contact problems and poorly adjusted.
- Follow constant "pulling" of the posit. towards the home position.
- Follow high current of Pos. damage DC Servo Board
- Consequence of heat generation
- Defective power transistor on the DC servo board
and depending on the vibration, the home switch worked or not. - Stupid hardware error!

But the fact that I had a spare DC servo board and a spare home microswitch here solved the problem.
(I have good spare parts here from 4 RL drives with broken motor or rust and similar damage)

Spare parts storage is important with now 3 x RL01 and 6 x RL02 - but they all work at the moment and I still have 9 air filters original packed and sealed from DEC.

regards

Mikesch

Subject	Author
problem with a RL01 drive	Mikesch
problem with a RL01 drive	Mikesch