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Old 21st August 2008, 08:49 PM   #1
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Question PG MS-2125 component values

Hello, I'm new to this forum and would like to request some help...

I recently aquired a PG MS-2125 with board rev C-1. I discovered 2 fried resistors and 2 loose caps. The resistors were too fried to read and I searched all over the net for schematics, or even a high quality photo I could zoom in on. What I'm getting at is, can anyone tell me the values of R170 and R271?

Thank you in advance.
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Old 21st August 2008, 11:27 PM   #2
ca90ss is offline ca90ss  United States
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520 ohm %5
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Old 21st August 2008, 11:55 PM   #3
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510?

Green Brown Brown Gold?
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Old 22nd August 2008, 01:27 AM   #4
ca90ss is offline ca90ss  United States
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^ You're right, it's 510.

<------colorblind
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Old 22nd August 2008, 02:00 AM   #5
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Perry is correct 510 ohm

BUT this is the clip indicator circuit and by my meager experiences on this exact series of amps tells me that there are some other blown components nearby and you might start looking at Q122, Q123 near R170. And Q222, and Q223 near R271.

And of course the LED's are usually toast also. As I say I base this solely on a few prior experiences dealing with this exact section of the MS 2500/2125/2250/MAC-500 series.
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Old 22nd August 2008, 07:51 AM   #6
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Thank you for the quick response! I see no noticeable or cosmetic flaws in those semi's, but i do have to replace and/or re-seat 2 of the caps on the power supply end. they are flopping around pretty bad.

as for the cause of r170 and r271, the left RCA input wire was off and could have easily made contact in a number of places. That is what i *think* caused the problem.

As always, feedback is VERY welcome.
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Old 22nd August 2008, 08:46 AM   #7
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The resistors are current limits for the clip LEDs so there are other issues in that circuit, and I doubt the RCAs were the issue.



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