Hi all,
I'm trying to repair one of these handsets which has the usual problem of going into searching mode. All the resets make no difference and the phone has gone from intermittently working to not working at all. Battery voltage appears fine at 2.8v Getting servicing info for these phones is impossible, so delving inside and making some preliminary checks it looks like there is some kind of voltage inverter. There are two large capacitors, one an SMD device 100uF and another a standard radial cap glued on its side to the board. Measuring the voltage here is 3.5v across the SMD cap and 3.19v across the other. I'd love to know what these voltages should be as in my experience any device with an inverter starts going dodgy after time and eventually packs up. (exactly what appears to be happening) It looks like this is built around a Phillips IC which is numbered EA
10271 or OM 591 neither of which I can find any data on. Could be on a wild goose chase here but if anyone would like to add anything I'm all ears.Cheers Bob