Caps do not show on scheme

rg12 · 27th August 2010, 06:02 AM

Im doing a recap for the whole amp and i went deep into the scheme
for many times and i also listed the all the caps in a sorted list.

I bought every cap i have to replace except for four 2.2uF/50v
caps that aren't anywhere in the scheme.

I though maybe they are written in different voltage in the scheme,
but after counting and triple checking everything, they are just not there!
How is that possible?

I want to know why are they there and how they affect the signal
so i will know which type to use.

Another thing is that i found that there is one 470uF/25v cap written
in the scheme and after making sure 10 times, it doesn't exist in the amp.
What's up with that?

es44 · 27th August 2010, 06:20 AM

It will be very hard for anyone to help you, as long as it's a deep secret what amplifier the talk is about.

Best regards
Ebbe

rg12 · 27th August 2010, 06:52 AM

The amp is Pioneer SA-7300.

I just wanted to know if these things are common, i looked 20 times at
the amp and the scheme.

Mooly · 27th August 2010, 07:38 AM

It's common to find differences in reality compared to the service manual.
Can you determine what part of the circuit they are in... where they connect in relation to other parts in the manual.

There may be different "country" variations and different versions of the amp that were put in place during production, with appropriate service bulletins issues to authorised dealers... it's normal.

Enzo · 28th August 2010, 04:08 AM

Is there a number printed on the circuit board near them - something like C123?

rg12 · 28th August 2010, 09:05 PM

I have finished recapping and found that 5 caps appear in the scheme
and not in the actual amp and 4 different caps appear in the actual amp and not in the scheme.

The amp scheme has a different page for european and england
differences but it's only for a small AC part of the scheme.

27th August 2010, 06:02 AM	#1
rg12 diyAudio Member Join Date: Aug 2010	Caps do not show on scheme Im doing a recap for the whole amp and i went deep into the scheme for many times and i also listed the all the caps in a sorted list. I bought every cap i have to replace except for four 2.2uF/50v caps that aren't anywhere in the scheme. I though maybe they are written in different voltage in the scheme, but after counting and triple checking everything, they are just not there! How is that possible? I want to know why are they there and how they affect the signal so i will know which type to use. Another thing is that i found that there is one 470uF/25v cap written in the scheme and after making sure 10 times, it doesn't exist in the amp. What's up with that?

27th August 2010, 07:38 AM	#4
Mooly diyAudio Member Join Date: Sep 2007	It's common to find differences in reality compared to the service manual. Can you determine what part of the circuit they are in... where they connect in relation to other parts in the manual. There may be different "country" variations and different versions of the amp that were put in place during production, with appropriate service bulletins issues to authorised dealers... it's normal. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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27th August 2010, 06:20 AM	#2
es44 diyAudio Member Join Date: Apr 2005 Location: Fredericia, DK	It will be very hard for anyone to help you, as long as it's a deep secret what amplifier the talk is about. Best regards Ebbe

27th August 2010, 06:52 AM	#3
rg12 diyAudio Member Join Date: Aug 2010	The amp is Pioneer SA-7300. I just wanted to know if these things are common, i looked 20 times at the amp and the scheme.

28th August 2010, 04:08 AM	#5
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Is there a number printed on the circuit board near them - something like C123?

28th August 2010, 09:05 PM	#6
rg12 diyAudio Member Join Date: Aug 2010	I have finished recapping and found that 5 caps appear in the scheme and not in the actual amp and 4 different caps appear in the actual amp and not in the scheme. The amp scheme has a different page for european and england differences but it's only for a small AC part of the scheme.

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