Jump to content

Recommended Posts

My Spider iv 150 died with a pop and a puff of smoke.

 

I found that D1 on the power supply board had disintegrated. I replaced it copying the polarity of D2 but that diode failed immediately. Now with a new diode reversed when switched on all front panel leds light up but after 10 seconds they go out one by one. This occurs with or without the power amp board connected.

 

What is the correct polarity for D1? A sketch would be helpful.

Any ideas on the cause of the initial failure would be appreciated. Thanks.

Share this post


Link to post
Share on other sites

I found the schematic at

 

 

 

It's going to take some digging to find the diodes.

 

Might have to take the head to a amp repair place, sounds like more is wrong than just the diodes,

 

Mark

Share this post


Link to post
Share on other sites

The link to the Spider IV schematic is in the third post from the top,

 

 

 

The detailed power supply/board schematic does not appear to be included in the SPIDER IV drawing, however the D1-D4 diodes are listed as SMALL SIGNAL AXIAL TH 1N4002 types.

 

You might look at the SPIDER III schematic (download same link). It looks like a more complete drawing,

 

Mark

Share this post


Link to post
Share on other sites

Thanks Mark.

I think the power supply is ok. The voltages around the voltage regulators on the preamp/effects board are what they should be.

I guess something on that board caused D1 to toast. Repair is likely to cost more than a SH amp head.

I may give up and put it on Ebay as not working.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×