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Orion 2150SX Schematic
Orion 2150SX Schematic
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Old 21st December 2013, 10:47 PM   #1
mr100percent is offline mr100percent  Austria
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Default Orion 2150SX Schematic

Hello everybody, i purchased a used orion 2150sx a couple of weeks ago and just found out that several of the output transistors (BJTs) and one Supply FET are kind of exploded. There are no burn marks on the PCB. I followed the threads about Orion Repair on this site with great interest and was wondering if somebody could help me with a schematic, otherwise i'll have to draw it from scratch which looks like a lot of work (double sided PCB and no part numbers - no fun).
Any help is greatly appreciated.
best regards,
Robert
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Old 21st December 2013, 11:11 PM   #2
Perry Babin is offline Perry Babin  United States
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It's unlikely that you'll need a schematic diagram to repair it. Replace the components that you know are defective (and those in parallel with those parts) and troubleshoot from there.
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Old 21st December 2013, 11:23 PM   #3
mr100percent is offline mr100percent  Austria
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That's one possibility, i just have the "feeling" of flying blind and if the repair gets probably more complex the time searching quickly outweighs the time "making" a schematic diagram and understanding all the parts (or modules) of the system.
Anyway, does anybody know if the BJTs are matched together, meaning should i replace all transistors or just the broken ones?
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Old 21st December 2013, 11:37 PM   #4
Perry Babin is offline Perry Babin  United States
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You have to replace all that are connected in parallel with the ones that failed. The replacements that are connected in parallel need to be from the same batch (matching date code).
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Old 23rd December 2013, 05:09 PM   #5
troystg is offline troystg  United States
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Old 23rd December 2013, 06:32 PM   #6
mr100percent is offline mr100percent  Austria
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Thanks. I am searching for a distributor and tomorrow i'll probably check the amp. The weird thing is, it is powering up, Rail voltage is fine, idle current too. Did not check the audio channels though. I am quite confident ther is not much more than the BJTs.
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Old 23rd December 2013, 10:05 PM   #7
Perry Babin is offline Perry Babin  United States
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I'd suggest buying 10 each of the MPSA06, MPSA56 and 10 ohm, 1/4w resistors. Those often fail when the power supply FETs fail.
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Old 24th December 2013, 05:41 PM   #8
mr100percent is offline mr100percent  Austria
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You gotta love orion amps. Finally finished drawing the schematic and started testing. In the PSU Section one driver is blown and in the amp section, Right channel, four 2n6488 and four 2n6491 are blown and the amp works like nothing happened!
Looked on the scope and everything is peachy.
I have a spare SMP60N06 and start ordering 6488 and 6491.

BTW: It could be of interest that Orion replaced the CEN-U07 / 57 Drivers and Pre-Drivers with 2SA1306B and 2SC3298B.
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Old 24th December 2013, 07:15 PM   #9
Perry Babin is offline Perry Babin  United States
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You can't replace only one power supply FET unless it's closely matched to the others.

The CEN-U07/57 are not pin for pin compatible with the transistors you listed so they are not a drop-in replacement.
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Old 24th December 2013, 07:21 PM   #10
mr100percent is offline mr100percent  Austria
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I beg to differ. For switching applications with MOSFETs there is no matching necessary (IMHO). For linear applications it is a different story.
The CENs are indeed not pin compatible. Orion must've changed the Layout then.
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