HT750 lost battery circuit

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arlojanis
Posts: 1055
Joined: Mon Jan 28, 2002 4:00 pm

HT750 lost battery circuit

Post by arlojanis »

I have an old UHF HT750 that has lost the circuit between the fuse and the power switch. The path is in the inside layers. Is there a good place to jump fuse up to switch?
"The world runs on radio."
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dearles
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Joined: Fri Dec 12, 2014 6:35 am

Re: HT750 lost battery circuit

Post by dearles »

A very common problem. You can normally jump it from the on/off switch to Q502 pin 1 or 4. Look at the board with the on/off switch in the upper right corner. Below the on/off switch you will see Q502 a six pin LED driver. Pin 1 will be the in the upper left corner and pin 4 in the lower right corner. The switched output of the on/off switch will be the one near the top of the board as you are looking at it. Good luck!
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arlojanis
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Joined: Mon Jan 28, 2002 4:00 pm

Re: HT750 lost battery circuit

Post by arlojanis »

Q502 is SWB+. What I need is UNSWB+, on the same side of board as switch lugs.
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