I did fix this clock. I carved away the carbonized PC board and built a better
heat sink arrangement for the TO-220 transistor, and I reattached the burned
traces with wires. I made wider clearance between the HV power paths too.
I may have some photos of the repair job at home; I will look tonight.
On 4/4/2016 1:14 PM, Ciaran Wills wrote:
Were you able to fix it? I have a V400 that appears to have suffered the same
fate, and I'd really like to get it running again.
On Saturday, April 19, 2014 at 3:05:50 PM UTC-7, nixiebunny wrote:
This clock had a hard life. The PC board was baked from the transistor
overheating. There was also a carbonized spot to the left of the transistor,
where the far end of the rectifier diode pad was placed very close to the
transistor, with a ground plane in there too! 0.5mm spacing between traces
with 200VAC on them. I don't know which was the chicken and which the egg.
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