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G-7500 output placement order

naderpe

naderpe

Well-Known Member
Need some help on the G-7500 output placement order? I have gotten a bit confused? The G-7500 manual does not list the F-3093 board. On this unit there is an F-2981 board on the left side of my picture and an F-3093 board on the right.
What is the correct output order, left to right, as seen from the pictures?

F-2981: NPN---PNP and F-3093: NPN---PNP
or
F-2981: PNP---NPN and F-3093: PNP---NPN

Or none of the above?:bash:
PNP: NJW1302GOS
NPN: NJW3281GOS

Thanks in advance
 

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Page 11 of the service manual shows where they should be.

Note, it is a bottom view.

Rob
 
Well I think it should be as I have them installed
F-2981: NPN---PNP and F-3093: PNP---NPN
Page 11 must be wrong according to how they are installed.
So far I have found one cap dead, a wire corroded off, one emitter resistors toasted, R52 and R58 fried, VR04 trimmer broken and there must be more because I still am getting a pulsating DBT.
 
The manual is correct actually but it IS confusing because they only show the one board in the PCB layouts. They also only refer to one board# in the schematic diagram. If you look at the bottom view however, they indicate the transistors and locations for each channel. Then you go to the parts list and it shows the transistors and the corresponding indicating numbers for each channel. I can see a gotcha where someone assumes that TR601 is the same part for both channels as well as TR602 respectively. They do in fact go (NPN - PNP) & (PNP - NPN).

As you can see for those who are basically parts changers or glean just enough info off the net or elsewhere, it can be lots of fun even armed with a service manual. There is no substitute for knowledge and experience especially when it comes to Sansui manuals :D
 
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