I removed 8 diodes marked ZS last night and will order replacements today.
Will report back with results. Thanks again for all the help so far
Nick
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On Fri, Mar 15, 2019 at 9:37 AM <tekscopegroup@...> wrote:
On Thu, Mar 14, 2019 at 03:57 PM, tom jobe wrote:
There are about 17 one amp ultra fast diodes that are used to rectify
the low voltages on the secondary side of the transformer. About a dozen
of them are in a row next to the transformer in the middle of the A18
board and they are known to fail especially if they are marked "ZS" or
one other marking which I can't remember.
If they are marked ZM or ZS they are well known to get leaky. Replace
these diodes with MUR160 600V 1Amp from Mouser/DK.
