Looks like the Cap (0.6uF I think) and the 48v Zener are in parallel.
Am I looking at the right part of the cct?

Also, if it is the right part, how does the voltage get down to 6v for the
IR Detector and Chip?

P

"James Sweet" wrote in message
news:AiOQi.5950$I22.4787@trndny03...

"Peter K" wrote in message
...
Ok, Step further now.
With both the fan and light disconnected (but power applied), checked
with a DC Voltmeter the voltage going to the IR receiver (and the single
chip on the controller board). Getting a nice stable 6 volts.

But when i press a button to turn the fan on, the voltage drops to about
3 volts (within 2 seconds).
During the time that the voltage is dropping, the receiver still
responds. but after that 2 sec time, it no longer responds.

There is 1 transistor that runs the light circuit, and 3 transistors for
the fan circuit. Pulling the 3 fan transistors, and then trying, the
voltage does not drop, and the receiver keeps on responding.

Looks to me like the trannies are drawing to much power, and loading down
the low voltage.

The circuit does not have any transformer, so it looks like it has
another way of reducing the mains voltage down to the 6v.

I have replaced all the caps I had stock of, and all the resistors check
within range.
Can anybody venture at a guess of whether there is a problem in the
tranny stage, or in the power reducer (not being able to supply current
under the load of the chip driving the trannies)

Thanks
P



The power supply is probably a mylar capacitor and a zener diode. Try
changing that capacitor, if it's bad, the psu cannot supply enough
current.