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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