Re: Wanted circuit diagram for AppleColor RGB Monitor

[mjmahon@aol.com (Michael J. Mahon)]

Mark Cummings replied:

<snip>
>> In my experience, blooming does not indicate failure of the Horizontal
>> Output transformer itself, but rather the failure of the high voltage
>rectifier
>> diode string which is embedded in modern HOT's.  If it is possible to fain
>> access to the outer winding of the high-voltage winding, another HV
>> diode can be connected and will probably fix the problem.
>
>I might be reading this wrong but the Horizontal Output Transistor would be
>the HOT ? not the EHT XFMR. Some call the EHT the Trippler, but I could
>never figure that out since it doesn't tripple the voltages :)

By HOT, I meant Horizontal Output Transformer, which you call the EHT
transformer.  We're talking about the same component.

>if the diodes are in the EHT  XFMR then the EHT XFMR is still the problem.
>Can you get HV diodes for these separately, I didn't realise that ?

The HV diodes are essentially the same in almost all small color monitors,
so substitution is pretty easy.  They are often potted into the transformer,
though.  ;-(

-michael

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