Hp-46 printer problem


I have searched the archives already, but only found a reference to a possible power supply capacitor failure that might cause printing problems in an hp-46. If this is not the cause with my units (I will check it tonight), what other problems/solutions are known?

In my case, I have two otherwise fully working hp-46 calculators, both with the LED display option, that share the same printing malfunction: The paper advance only works sporadically, if at all. From the outside I suspect a worn drive roller or belt or non-engaging clutch. The working principle of the paper advance mechanism can only be guessed without disassembling the printer and I am a bit reluctant to do so, especially if there are no spare parts anyway...

Greetings, Max

NB: Sooner or later, because they take up too much space (says my wife) I will have to part with one of them - so if anyone is interested, watch the classifieds section! (I prefer trading to selling and could throw in a nice 41CX as well)


You can get 'my' schematics of the HP46 from The Australian Site. The logic board diagrams show the circuit that operates the feed solenoid, you might just check that's working correctly, but I am pretty sure your problem is mechanical.

From what I remember (and it's been a few years since I've been inside the 46), the feed solenoid in the printer engages a follower on the main camshaft, and it's the force of that cam rotating that operates the feed ratchet. My guess is that there's hardened grease somewhere in the mechanism so that it doesn't snap over as sharply as it should. Unfortunately I've never stripped a 46 printer (I did a similar printer in a Fluke data logger about 20 years ago...), so I can't tell you just what to take off.

Possibly Related Threads…
Thread Author Replies Views Last Post
  HP-46 printer Ignacio Sánchez 10 2,948 11-14-2012, 03:25 AM
Last Post: Ignacio Sánchez
  HP-46 not working Ignacio Sánchez 1 1,023 10-24-2012, 11:17 AM
Last Post: Donald Williams
  HP-46 codename Ignacio Sánchez 2 1,140 10-24-2012, 03:47 AM
Last Post: Johnny Bjoern Rasmussen
  HP-46 faulty keys - to Katie Juergen Keller 4 1,494 10-10-2011, 04:23 AM
Last Post: Juergen Keller
  RIP 46 Keith Midson 9 2,493 12-22-2010, 11:51 AM
Last Post: Katie Wasserman
  HP 9845A Printer Problem Mike 3 1,216 08-12-2010, 01:16 PM
Last Post: Mike
  Miss the print key on my HP 46 Jonathan 3 1,283 08-10-2010, 07:32 AM
Last Post: Jonathan
  Printing statistics calc // 46 Walter B 3 1,297 07-18-2009, 08:25 PM
Last Post: Mark Edmonds
  HP-46 find GanjaTron 9 2,401 01-30-2009, 05:23 PM
Last Post: Walter B
  Is a 46 worth 1000 Euro? Marcus von Cube, Germany 5 1,756 11-01-2008, 02:03 AM
Last Post: DaveJ

Forum Jump: