Dear Sir,

Thank you for your response. I have been studying the schematics and I
am familiar with the placement of the components on the F-2625 power
supply board and the F-2624 driver board.

My troubleshooting skills are minimal. I was going to check the listed
voltages at various points on the power supply and driver boards i.e.,
output from driver board, voltage across power transisters.

I can check individual components. I am just not sure if you can check
them on the board or if they should be removed and then tested.

I have not noticed any parts that look burnt.

Age and heat probably led to the failure. I stored the equipment in a
stereo cabinet but it did not have proper ventilation.

Any advice or instructions would be greatly appreciated. I have owned
the receiver since 1978 and it has sentimental value.

Sincerely,

Marc

Meat Plow wrote:
On Wed, 10 Jan 2007 15:32:57 -0800, Marc Has Frothed:

My Sansui 7070 receiver broke a few years back and I have recently
started looking into repairing it. I purchased the schematics for this
system. The two fuses for the rectifier on the F-2625 power supply
board are both blown. I am worried about replacing them and powering
up the system with out knowing why they are blown in the first place.
I do not want to damage the system any further. Any ideas on how to
proceed?

Thank you in advance for your time.

Sincerely,

Marc

Check the rectifier for shorts? Know how to do that? Anything else look
burnt? What led up to the fuses blowing? What are your troubleshooting
skills? Would you like detailed instructions on how I would go about
servicing this unit?

--
Pierre Salinger Memorial Hook, Line & Sinker, June 2004

COOSN-266-06-25794