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HP 41C DOES NOT BEEP
08-30-2014, 06:44 PM (This post was last modified: 08-30-2014 06:46 PM by jebem.)
Post: #11
RE: HP 41C DOES NOT BEEP
(08-30-2014 05:31 PM)aurelio Wrote:  I think maybe the "beep" missing could be due to a cold soldering, I added a magnified pic of the board and it seems the upper point could be one of those.

Hi Aurelio, good work!
After getting this far, if I were you I would use a new 15 watt low power pen soldering iron to unplug the two wires.
Then remove that solder mess on the PCB. Clearly it was not correctly soldered.
Now you need a audio oscillator (I use my multimeter that has a built in 2Khz signal) to test the buzzer and make sure it works.
Then resolder the wires using a low melting point good quality solder, using adequate heating to make a good solder joint (if the soldering iron requires more than 2 seconds to make an good melting it means you are using a underpowered tool).
Good luck with it.

Jose Mesquita
RadioMuseum.org member

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Messages In This Thread
HP 41C DOES NOT BEEP - aurelio - 08-26-2014, 02:55 PM
RE: HP 41C DOES NOT BEEP - Jim Horn - 08-26-2014, 09:30 PM
RE: HP 41C DOES NOT BEEP - aurelio - 08-27-2014, 06:42 AM
RE: HP 41C DOES NOT BEEP - Les Bell - 08-27-2014, 03:52 AM
RE: HP 41C DOES NOT BEEP - aurelio - 08-27-2014, 06:53 AM
RE: HP 41C DOES NOT BEEP - aurelio - 08-30-2014, 03:25 PM
RE: HP 41C DOES NOT BEEP - Geoff Quickfall - 08-30-2014, 04:13 PM
RE: HP 41C DOES NOT BEEP - Mark Hardman - 08-30-2014, 04:46 PM
RE: HP 41C DOES NOT BEEP - aurelio - 08-30-2014, 05:31 PM
RE: HP 41C DOES NOT BEEP - jebem - 08-30-2014 06:44 PM
RE: HP 41C DOES NOT BEEP - aurelio - 08-30-2014, 07:00 PM
RE: HP 41C DOES NOT BEEP - Mark Hardman - 08-30-2014, 06:29 PM
RE: HP 41C DOES NOT BEEP - aurelio - 08-30-2014, 07:33 PM
RE: HP 41C DOES NOT BEEP - Mark Hardman - 08-30-2014, 07:41 PM
RE: HP 41C DOES NOT BEEP - aurelio - 08-30-2014, 07:56 PM
RE: HP 41C DOES NOT BEEP - Geoff Quickfall - 08-30-2014, 07:02 PM
RE: HP 41C DOES NOT BEEP - aurelio - 08-30-2014, 08:13 PM
RE: HP 41C DOES NOT BEEP - Geoff Quickfall - 08-30-2014, 08:25 PM
RE: HP 41C DOES NOT BEEP - aurelio - 08-30-2014, 08:54 PM
RE: HP 41C DOES NOT BEEP - Geoff Quickfall - 08-30-2014, 09:27 PM
RE: HP 41C DOES NOT BEEP - aurelio - 08-30-2014, 09:56 PM



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