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Exposure Model Super XV (XX), PCB "15 SUPER" ISSUE 5 (APRIL 1997) - Schematic needed
Exposure Model Super XV (XX), PCB "15 SUPER" ISSUE 5 (APRIL 1997) - Schematic needed
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Old 14th August 2017, 04:57 PM   #1
tiefbassuebertr is offline tiefbassuebertr  Germany
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Location: D-55629 Schwarzerden
Default Exposure Model Super XV (XX), PCB "15 SUPER" ISSUE 5 (APRIL 1997) - Schematic needed

For troubleshooting and performing various measurements I need a schematic diagram resp. service manual of this integrated amplifier:
Freie Ton- und Bildwerkstatt: Exposure XV super 1997
Exposure XV problems, schematic needed! - pink fish media

unfortunately under
Exposure Electronics
their schematics aren't online available.
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Old 31st August 2017, 01:09 PM   #2
tiefbassuebertr is offline tiefbassuebertr  Germany
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The topology must be very special.
In the output stage are follow two Exicon MOSFET's in use:
1) EXP002N
2) EXP002P
Idle current through this MOSFET's is only 5mA (1mV about each 0R22 source resistors).
This value is unusual, values above 100mA are usual by the use of MOSFET's.
There is also no possibility for adjusting by a potentiometer.
- maybe a bias servo is in use - go to
Dynamic Bias - Active Bias - Automatic/Self biased - Overview wanted

Additional features I note:
- a second pair of MOSFET's is in use: EXP8N and EXP8P - maybe a voltage regulator
- Pickering Reed Relais "80-2-A-12/1" - go to
http://www.pickeringrelay.com/pdfs/8...eed-relays.pdf
which function?

The front-end uses follow small signal transistors:
BC414C or BC560C (OnSemi), ZTX452-552, ZTX214/384 (ZETEX/DIODES)

Sound is good, but a bit crispy by compare to class A amps.

Maybe there are possibilities for enhacement of the sonic quality. therefore schematic needed.

Last edited by tiefbassuebertr; 31st August 2017 at 01:17 PM.
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