Bose 7 channel car amp model:143158 no audio output

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1992 Mercedes diesel 300SD Bose 7 speaker car amp model:143158 amp
assembly=Beta W-140.The audio became statically and low almost
completely muted,upon troubleshooting I found F1=10 amp pico fuse
open,all 7 channels have their own pcb board which is soldered into the
double sided main board so I cannot isolate the problem.
Anyone have any common repair tips for me? and maybe a
schematic?.Thanks.

Sidney
E-mail:sidneybek(at)yahoo.com
Dartmouth,Nova Scotia
Canada

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Would only ground pin for each channel board cause F1=10 amp pico fuse
to open? as that would cause the VCC (B+) for each channel to become
intermittent.As I took my Fluke DMM series II model:29 and compared
each channel board and they all measured the same as each meaning I
measured each pin on every board with respect to ground.

Sidney
Dartmouth,Nova Scotia
Canada

1992 Mercedes diesel 300SD Bose 7 speaker car amp model:143158 amp assembly=Beta W-140.The audio became statically and low almost completely muted,upon troubleshooting I found F1=10 amp pico fuse open,all 7 channels have their own pcb board which is soldered into the double sided main board so I cannot isolate the problem.

Anyone have any common repair tips for me? and maybe a
schematic?.Thanks.

Sidney
E-mail:sidneybek(at)yahoo.com
Dartmouth,Nova Scotia
Canada

O
|\ __O
_|_| \


(\__/)
(='.'=)
(")_(")

This is Bunny.Copy and paste bunny into your signature to help him gain
world domination.