BSS DPR-402 Service Manual

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frank_que

Member
Joined
May 18, 2015
Messages
5
Location
IT
I'm looking for BSS DPR-402 Service Manual, I've found the schematic but I need service manual for the calibration procedure, can someone help me?
 
:( Still no answer from BSS support...

Does anyone know how to calibrate "-10" and "-20" trimmers on VCA board?  ::)
 
frank_que said:
:( Still no answer from BSS support...

Does anyone know how to calibrate "-10" and "-20" trimmers on VCA board?  ::)

Maybe if you post a link to the schematic and point  to where the trimmers are at, they may be able to decode what needs to be done????
 
frank_que said:
:( Still no answer from BSS support...

Does anyone know how to calibrate "-10" and "-20" trimmers on VCA board?  ::)
Which version of VCA card do you have, the one with 13700's or that with 2150's?
Now the schemo doesn't say which trimmer is what. You can tell.
 
Hello,

here the schematic: https://elektrotanya.com/bss_dpr402_sch.pdf/download.html

The VCA use THAT2150A  (on right side of the last page of schematic) and I've replaced them with the 2181A.

I've removed R5, R7, replaced R11, R2 with 5,1K, R10, R3 with 680K, C2 with 22pf on both VCA boards.

I've also changed the op amp TL072 with a LM4562.

Trimmer PS1 sets THD, PS2 -10 and PS3 -20.

I've also made the same MOD to DPR-422, I don't have schematic of it, but the VCA circuit is identical, instead of a That 2150, there was a 2155.

Now I need to calibrate properly -10 and -20 trimmers.
 

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