supra 500 xp

lost_loven · 28 June 2009, 00:56

A500 runs good.. have a supra xp 500 and when i plugg it into the side of the a500 expansion bus and turn on the machine its just a black screen, power light on the unit but none on the 500.. it has 2 megs of ram on board and a 80 meg hard drive.. hard drive disabled and even removed and same thing. removed the ram, set jumpers to 0k and still no go.. tried with just the hard drive with no ram and nothing.. hmmmmmm

lost

rkauer · 28 June 2009, 03:33

Not enough "juice" on the PSU can be the cause.

Does the unit have their own power supply?

lost_loven · 28 June 2009, 14:31

yes the harddrive has its own power supply.

rkauer · 28 June 2009, 18:19

Then check the voltage the unit's PSU provides.

Specially the +5V rail, who must be in the 4.85 to 5.25V range and steady.

Toni Wilen · 28 June 2009, 18:41

Try without separate powersupply by connecting two jumpers (marked "5" and "6") next to amigabus connector.

NOTE: Never connect powersupply to HD controller if jumpers are connected!

lost_loven · 28 June 2009, 18:58

k, dissconnected powersupply, added jumpers to 5 and 6 and still no go, opened up this morning and noticed hard drive disable switch looked burned around where it was mounted on board, replaced switch with another switch. Also noticed there is a 4 pin componet beside it thats in cased in black and around 2 of the 4 pins it looks abit fried also ( not blackened but a real off set grey then a standard looking soldered point) Thinking i might have to replace that.. everything else on the board looks good. not sure how to go about testing that, I will remove it and see if electronic store has one to replace. sound right thing to do next?

chiark · 28 June 2009, 22:26

first off, check for shorts in the ciruitry around that: chances are if it's shorted out, it will have done so for a reason... It could be that the switch has failed and shorted to the case, but all the same worth checking twice.

Sounds like a good course of action though. check and double check. I'd run it off the standalone PSU to ensure that you don't take out something in the 500 if there is a short!

Don't forget to change those jumpers back if you use the PSU!

Good luck!

Toni Wilen · 29 June 2009, 14:13

Can you take any photos?

28 June 2009, 00:56	#1
lost_loven Registered User Join Date: May 2007 Location: winnipeg Posts: 358	supra 500 xp A500 runs good.. have a supra xp 500 and when i plugg it into the side of the a500 expansion bus and turn on the machine its just a black screen, power light on the unit but none on the 500.. it has 2 megs of ram on board and a 80 meg hard drive.. hard drive disabled and even removed and same thing. removed the ram, set jumpers to 0k and still no go.. tried with just the hard drive with no ram and nothing.. hmmmmmm lost

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28 June 2009, 03:33	#2
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Not enough "juice" on the PSU can be the cause. Does the unit have their own power supply?

28 June 2009, 14:31	#3
lost_loven Registered User Join Date: May 2007 Location: winnipeg Posts: 358	yes the harddrive has its own power supply.

28 June 2009, 18:19	#4
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Then check the voltage the unit's PSU provides. Specially the +5V rail, who must be in the 4.85 to 5.25V range and steady.

28 June 2009, 18:41	#5
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,587	Try without separate powersupply by connecting two jumpers (marked "5" and "6") next to amigabus connector. NOTE: Never connect powersupply to HD controller if jumpers are connected!

28 June 2009, 18:58	#6
lost_loven Registered User Join Date: May 2007 Location: winnipeg Posts: 358	k, dissconnected powersupply, added jumpers to 5 and 6 and still no go, opened up this morning and noticed hard drive disable switch looked burned around where it was mounted on board, replaced switch with another switch. Also noticed there is a 4 pin componet beside it thats in cased in black and around 2 of the 4 pins it looks abit fried also ( not blackened but a real off set grey then a standard looking soldered point) Thinking i might have to replace that.. everything else on the board looks good. not sure how to go about testing that, I will remove it and see if electronic store has one to replace. sound right thing to do next?

28 June 2009, 22:26	#7
chiark Needs a life Join Date: Jan 2008 Location: England Posts: 1,707	first off, check for shorts in the ciruitry around that: chances are if it's shorted out, it will have done so for a reason... It could be that the switch has failed and shorted to the case, but all the same worth checking twice. Sounds like a good course of action though. check and double check. I'd run it off the standalone PSU to ensure that you don't take out something in the 500 if there is a short! Don't forget to change those jumpers back if you use the PSU! Good luck!

29 June 2009, 14:13	#8
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,587	Can you take any photos?

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