Phenolic PCB Repair

[Bully]

I have an amp which uses a phenolic PCB which has a hole burnt in it....any
ideas on the best way to repair it? I have no idea where to begin.

Bully

 

[atec]

epoxy putty ?.

Bully wrote:

I have an amp which uses a phenolic PCB which has a hole burnt in it....any
ideas on the best way to repair it? I have no idea where to begin.

Bully

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[Bob M]

"Bully" <thebulls@iinet.net.au> wrote in message news:<40d670ad$0$9450$5a62ac22@per-qv1-newsreader-01.iinet.net.au>...

I have an amp which uses a phenolic PCB which has a hole burnt in it....any
ideas on the best way to repair it? I have no idea where to begin.

Bully

How big is the hole? How many pc traces are affected?

Usually, burnt holes are the result of overheated resistors, but
ocasionally semiconductors. In either case, remove any pc traces and
burt pcb with an exacto knife and replace the conductor paths with
jumper wires. Attach the jumper wires to a clean piece of trace or
where the trace terminates (at a component).

A new hole can be drilled into a clear spot of the pcb to mount a
replacement resistor. If this is not possible (no room), you can buy a
small piece of vector board (glass epoxy is the best type if pcb) and
using epoxy glue attach it to the existing pcb.

If the hole was the result of an overheated resistor, I would
recommend mounting the replacement resistor as high off the board as
possible. Also, try and fit in a replacement resistor of a higher
wattage. Its greater physical area will help disipate the heat better.

Take your time and work slowly and carefully and you will be
successful.

Best of luck and cheers from Canada

Bob M.

 

[Patrick Dunford]

In article <512df638.0406211224.77f04fb9@posting.google.com>,
bmorgoch@sympatico.ca says...

If the hole was the result of an overheated resistor, I would
recommend mounting the replacement resistor as high off the board as
possible. Also, try and fit in a replacement resistor of a higher
wattage. Its greater physical area will help disipate the heat better.

obviously try and find the fault which caused the resistor to overheat
(if applicable)