HP Forum Archive 15

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HP 35 adapter 03502A Message #1 Posted by Michael on 23 Mar 2006, 3:28 p.m. I have the old 03502A adapter for the HP 35 calculator. It doesn't work correctly: when connected to the calculator, then after switching the calculator ON the display lights just for a split second and then the display switches off. Does anbody know, how to open this adapter? There are no visible screws. Thanks Michael

Re: HP 35 adapter 03502A Message #2 Posted by Frank Boehm on 23 Mar 2006, 4:41 p.m., in response to message #1 by Michael it's sealed - you can only crack it open (which is btw not easy...)

Re: HP 35 adapter 03502A Message #3 Posted by Ronald on 23 Mar 2006, 4:56 p.m., in response to message #1 by Michael Hi Michael, Did you check if it the problem is not in the wire itself, I think that is a common problem ? Ronald

Re: HP 35 adapter 03502A Message #4 Posted by Michael on 23 Mar 2006, 6:10 p.m., in response to message #3 by Ronald Voltage between the center pin and the left pin is cca 4.2V, the same 4.2V is between the center pin and the right pin.

Re: HP 35 adapter 03502A Message #5 Posted by Frank Boehm on 24 Mar 2006, 10:05 a.m., in response to message #4 by Michael That's only the off-load voltage. I'd suggest checking the voltage again with the calculator plugged in - it's probably well below 4.2V, which hints at a defect (capacitor?) Does the calculator work with another charger?

Re: HP 35 adapter 03502A Message #6 Posted by Michael on 24 Mar 2006, 2:33 p.m., in response to message #5 by Frank Boehm One voltage stays ar 4.2V during load, the second drops to cca 3.3V. I mean that the voltage between the center pin and one of the outer pins should be 16V though. The calculator works well with an another adapter.

Re: HP 35 adapter 03502A Message #7 Posted by Dave Shaffer on 24 Mar 2006, 5:10 p.m., in response to message #6 by Michael Even though you say the calculator works with another charger, you might want to check the ON/OFF switch. On my '35, the switch is rather intermittent, and one of the symptoms seems to be that the calculator switches ON but then goes off immediately. Wiggling the switch (i.e. jiggling the slider back and forth a bit in the on position) will confirm a problem: the LEDs will blink on and off. Spraying some electronic contact cleaner into the switch (be careful, don't overdo it!) may help.

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