Help with Velocity VD-504

Speeed3 · 26th December 2007, 02:43 PM

I am currently repairing a Velocity VD-504 full-range class-D amplifier which was in protection mode. On one channel at least the output mosfets and certain SMD parts are defective.

Attached is a circuit diagram indicating the badly damaged components (circled), and a photo of the inside of the amplifier. Would it be a good idea to change some other parts as well in order to prevent the amplifier from breaking within a short time, as the owner claimed had happened after being repaired by the importer?

Which diode can be used to replace diode 1ss355, since it seems to be impossible to purchase these diodes anywhere in Finland?

http://img205.imageshack.us/img205/8818/picton2.jpg

http://img299.imageshack.us/img299/800/circuitwr1.gif

grzechhh · 9th March 2008, 09:22 AM

Hi

Is there any chance to have the full circuit diagram of the Velocity VD-504. I will be very grateful.

sdoom · 9th March 2008, 02:52 PM

the ECA database shows this diode as follows

SMD, SS (= fast switching) , 40V, 0,1A, <3pF, <4ns

Replacements: HSU 119, MA 111, 1SS332, 1SS352, 1SS354

Guess they are hard to find as well, but with the upper electr. spec you should be able to find a suitable replacement.

26th December 2007, 02:43 PM	#1
Speeed3 diyAudio Member Join Date: Dec 2006	Help with Velocity VD-504 I am currently repairing a Velocity VD-504 full-range class-D amplifier which was in protection mode. On one channel at least the output mosfets and certain SMD parts are defective. Attached is a circuit diagram indicating the badly damaged components (circled), and a photo of the inside of the amplifier. Would it be a good idea to change some other parts as well in order to prevent the amplifier from breaking within a short time, as the owner claimed had happened after being repaired by the importer? Which diode can be used to replace diode 1ss355, since it seems to be impossible to purchase these diodes anywhere in Finland? http://img205.imageshack.us/img205/8818/picton2.jpg http://img299.imageshack.us/img299/800/circuitwr1.gif

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9th March 2008, 09:22 AM	#2
grzechhh diyAudio Member Join Date: Jan 2003 Location: Poland	Hi Is there any chance to have the full circuit diagram of the Velocity VD-504. I will be very grateful.

9th March 2008, 02:52 PM	#3
sdoom diyAudio Member Join Date: Mar 2004 Location: Heidelberg	the ECA database shows this diode as follows SMD, SS (= fast switching) , 40V, 0,1A, <3pF, <4ns Replacements: HSU 119, MA 111, 1SS332, 1SS352, 1SS354 Guess they are hard to find as well, but with the upper electr. spec you should be able to find a suitable replacement.

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