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Miller & Kreisel Volkswoofer-1B amp issue
Miller & Kreisel Volkswoofer-1B amp issue
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Old 2nd October 2018, 03:06 AM   #1
kenwood61 is offline kenwood61  United States
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Default Miller & Kreisel Volkswoofer-1B amp issue

Hi guys,

So I have a Volkswoofer-1B that was working before I got it last week. When I first hooked up and powered up, it blew the internal fuse (4A, 250V). I opened up the cabinet and found four loose washers on the cab floor, that should have been on the mounting screws for the power supply board. The distance between the solder traces underneath are enough to allow any of those washers to make a connection.

I visually inspect everything, clean off old glue for ps board and amp board. Everything looks pretty. I connect the harness for the ps to amp board and get a semi violent response from the driver. Pull everything apart and test all resistors on the board for continuity ... to see if any are open.

I find R31, R32 open. These are 4.7 ohm, 1/4w which I have replacements. Before I pull the pcb off the amp plate, I'd like to figure out if there are any other components in circuit with R31, R32 that I should be concerned with. This is the first time I've dealt with open resistors. Normally, I'm simply recapping boards.

Attached are some photos and schematics in case anyone has time to help. BTW, the photos were taken before I cleaned the glue off the boards. Thanks!
Attached Images
File Type: jpg IMG_1790.jpg (476.3 KB, 45 views)
File Type: jpg IMG_1787.JPG (901.3 KB, 46 views)
File Type: jpg IMG_1783.jpg (866.8 KB, 44 views)
File Type: jpg IMG_1792.jpg (336.5 KB, 43 views)
File Type: jpg IMG_1789.JPG (585.6 KB, 43 views)
Attached Files
File Type: pdf MK VW1B schematics.pdf (278.0 KB, 7 views)
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Old 2nd October 2018, 07:45 PM   #2
kenwood61 is offline kenwood61  United States
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Moderator, you can delete this thread ....

I found a verified shop to look at this and not going to risk causing damage. Thanks!
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