Hi, I'm having a Pioneer which doesn't turn on any more, and have found the SMPS to be the problem, but with my somewhat limited smps knowledge I can't find the problem.
Purchased the full service manual, and have attached the smps diagram.
230volt mains.
I measure 325vdc on C805.
On IC821 I measure 21.5 volt on VCC so this should mean that its above startup voltage.
3.1volt on feedback. and I get 3.3volt on the 3.3volt output from the transformer (after d223 and d224)
+22 and +15 volt is however dead, so I suspect IC823 is dead, but before I rush out and purchase a new I just wanted to check with the experts if I have missed something.....
Unfortunate I don't have a scope :-(
Purchased the full service manual, and have attached the smps diagram.
230volt mains.
I measure 325vdc on C805.
On IC821 I measure 21.5 volt on VCC so this should mean that its above startup voltage.
3.1volt on feedback. and I get 3.3volt on the 3.3volt output from the transformer (after d223 and d224)
+22 and +15 volt is however dead, so I suspect IC823 is dead, but before I rush out and purchase a new I just wanted to check with the experts if I have missed something.....
Unfortunate I don't have a scope :-(
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