I have an HP fax-700. It will start up when I turn it on, then it loses the connection, or shuts itself off. What is wrong?
Model: fax - 700
un-plugging & re-plugging in the power cord as well as the cord to the jack
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When you say that it looses connection or turns off, is it right when you power it on everytime?
This just started happening recently. I turn it on, it boots-up, then screen goes blank, just as if I had turned the machine off. I was able to rcv a fax yesterday, but the next one coming thru, machine just blinked off.
Ah ok. Sounds like it's Power Supply is growing weak in it. I assume that you've gotten some use out of this little guy. What happens is a component called a Capacitor begins to go weak and there is always more than one of them. They aid is maintaining Power Distribution throughout the device. When they go bad (And they will), you'll start seeing these problems. The problem is, repairing them cost way more than replacing them.
how many capacitor's are in the machine, and how would you know which one has gone bad? What does a capacitor cost?
Relist: Incomplete answer.
On the power supply? It's hard to say, but the main ones that can cause problems will be about 5-7 of them on the Filter Output Section. They are replaced by using a soldering iron and solder containing flux. If your looking to do this yourself, once you have the Board out, you can take a picture of the Board and I can point out which ones may be bad. Without an O-Scope, it will be impossible to test them all and see which ones are bad. Most of the time, a bad Cap will look perfectly normal on the outside.
Current Electronics Shop Owner and Master Technician in FL.