Atari DD 1050 repair tips and PSU

[repetto74]

Hi guys,

 

I picked up a 1050 DD non working for a few buck and I would try my chance to repair it.

 

-the drive came with no PSU and I know it is difficult to find one but if anyone has a link where I can get one of these 9V AC PSU's. I am located in Europe and need a 220V PSU.

 

-With the hope of putting my hands on a suitable power unit I would like some tips on how to diagnose fault on this drive. Apparently the guy said the red light comes up but that's all, no sound of motor spinning or whatever. It may have a problem with the 12V line of the motor I think but will need a PSU for that. Where should I check for the 12V inputs? The 12V regulator?

 

Also what can i check now is the impedance of the read/write head to ensure it is ok. Does anyone have the resistance values at each pin of the R/W connector for me to check ?

The mechs is a TANDON.

 

Many thanks in advance.

Edited August 31, 2018 by repetto74

[flashjazzcat]

The PSUs discussed in the few posts starting here will do fine:

 

http://atariage.com/forums/topic/281972-replacement-psus/?do=findComment&comment=4095535

 

I will leave troubleshooting advice to others, since I don't have much experience repairing 1050s.

[+Nezgar]

-the drive came with no PSU and I know it is difficult to find one but if anyone has a link where I can get one of these 9V AC PSU's. I am located in Europe and need a 220V PSU.

 

-With the hope of putting my hands on a suitable power unit I would like some tips on how to diagnose fault on this drive. Apparently the guy said the red light comes up but that's all, no sound of motor spinning or whatever. It may have a problem with the 12V line of the motor I think but will need a PSU for that. Where should I check for the 12V inputs? The 12V regulator?

I wouldn't worry too much until you know you're using a proper rated PSU before assuming there's any issues with it. The 12V side draws the most power when the motor is spinning, and will not work properly if either DC or an insufficient Amperage 9V supply is used.

 

There was a recent thread discussing EU/UK 9VAC PSU options here: http://atariage.com/forums/topic/281972-replacement-psus/

and previous to that as well: http://atariage.com/forums/topic/221488-euro-power-supplies/

 

in summary

UK version 2.1A supply: https://www.amazon.co.uk/RockPower-Power-Supply-Great-Britain/dp/B00LLHKKZG/ref=lp_5440365031_1_6?srs=5440365031&ie=UTF8&qid=1534829848&sr=8-6

EU version 2.1A supply: https://www.amazon.de/dp/B00EA13U3E/ref=pe_386171_38075861_TE_item

Hard to find higher AMP 220/230V adapters currently, but 2.1A should be sufficient.

[repetto74]

Hard to find higher AMP 220/230V adapters currently, but 2.1A should be sufficient.

 

 

Is 2.1 amps sufficient? I read somewhere it would need more around 3 amps to be on the safe side and avoid PSU overheat.

 

EDIT : I have checked other users and there is this RockPower PSU at 2.1 amps which seems to work pretty good so I just ordered one :-). Just to wait a couple of days and I can start some T/S.

Edited August 31, 2018 by repetto74

[flashjazzcat]

1.3 amps are sufficient, we finally figured out. This figure is verified by current draw measured on an operational 1050. Therefore a 2A 9VAC PSU is an ideal choice for the 1050.