The following warnings occurred:
Warning [2] Undefined array key 9784 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 9789 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 9791 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 9792 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 9793 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 9799 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 9804 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $thread - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $fid - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 9792 - Line: 331 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 331 errorHandler->error_callback
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 304 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 9804 - Line: 331 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 331 errorHandler->error_callback
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 304 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $theme - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $theme - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $lang - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 5 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Attempt to read property "messages_in_thread" on null - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 5 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks





9815A Printer Question



#8

I have an almost New condition 9815a. The thing is spotless inside. It is as tough this thing was purchased and put aside and never used. Maybe because of
the printer problem. The print head is working fine but the paper is not advancing.

What is happening is that during the printing of a line, the printer solonoid energizes at the beginning of the line and releases at the end. It is not actuating on
each of the line feed pulses. I can feel the solonoid energize for each pulse but it is as though the energy stored in the coil is not being released between
pulses.

I think there may be some defect in the path that is used to release the energy. I don't have a schematic and will try to buz this out later this week but was wondering if the components are all on the main circuit board or if some might be embedded inside the colonoid coil.

OR, might there be another problem that I have not thought of. I know the ratchet mechanism works ok because I have tested it manually. The return spring
seems fine.

Thanks


#9

As far as I know, the solenoid on these printers is just a simple solenoid -- there's nothing
hidden inside it. And the solenoid drive circuit on the 9815 is also fairly simple -- just a transistor switch (albeit with a current sensing resistor)
But I think your problem is mechanical. IIRC there's a little bit of foam on the end of the armature lever (or maybe the solenoid core). This turns
to 'glue' with time and (a) causes the mecanism to stick and
(b) allows it to stick from residual magnetism holding the armature on the solenoid core.
I would start by taking the printer apart. Remove it from the machine -- unplug the connectors for the printhead, solenoid, and paper out sensor, then
undo the 4 screws on the bottom of the machine. Take off the paper sensor board (2 screws on top) to get it out of the way. Take out the 2 screws holding the bar across the front of the printer (caution -- it's spring loaded), then remove the bar, the springs and the
printhead hybrid circuit (take great care when handling this). Take out the screws from the right hand end of the printer, and take the frame apart. The solenoid
comes free, as does the roller/armature assembly (don't let the return spring fly out).
Clean off the remains of the foam, and if there's any problem from residual magnetism, stick some _thin_ foam onto the end of the solenoid core.
If it's not a mechanical problem, I'll have to look over the driver again, I guess...


#10

There was some black goo all over the place. The first thing I thought of was that somehow this goo was tacky enough to hold the armature. I cleaned it the best I could without disassembly and it made no difference.

The other thing I noticed was that in order for this to be an effective mechanism (which it is), I would have expected a crisp snappy action. But it seemed a bit sluggish.

Maybe there is some more goo somewhere that is gumming up the works.

I will do as you suggest and take it apart tonight and give it a thorough cleaning. I was a bit nervous about taking it apart because there are some adjustment screw (it looks like) on the aluminum part behind the print head and I was worried about getting something out of calibration.

Thanks


#11

A couple more comments. Firstly, these printers do feel a bit sluggish (or at least the ones I have do)
-- there's a fair amount of rubber damping stuff, etc in them. Secondly, I've
taken apart this type of printer in my 9815 and 9825, and I've never had problems with
losing the adjustment settings. Don't remove the printhead from the
aluminium heatsink block -- take out the bar I mentioned and pull the printhead
and heatsink out together. The only other adjustment in the printer is the back stop for the armature (the locknut and slotted shaft at the front right). Don't
touch this unless you know it to be out of adjustment. Other than that there's no problem in taking one of these units apart
and getting it back together again.

#12

That was the problem. I disassembled the printer and sure enough, it was much goopier than I thought.

I cleaned the sticky black stuff off and sealed the surface with some tape (temporarily) and tested it.

It worked great. The font height was too high because I think there was a pad at one time between the armature and the adjustment screw (is that correct)? I put some material (again temporarily). If there is what should the material be and how thick?

The printer works great now. I just don't know if the surface that comes into contact with the solonoid core needs some padding to replace what was dissolved. How thick?

I have another question but I'm going to put it into another thread so the subject will make sense.

Thanks a bunch.


#13

As I remember it : There are 4 little rubber pegs in the holes on the end of the armature. They are
fairly stiff rubber, and project about 1mm from the face of the armature (I would have to take one of my machines apart to
get the exact dimensions). There's also the soft foam on the solenoid core, but that's less important.
On the adjusting screw there's a pad fixed to the end of the screw, I think. It wasn't metal-on-metal contact here. If that's just worn, try screwing that screw in a bit --
so that the ratchet can only pick up one tooth on the advance knob (this will make sense with
the unit in front of you). That might be all it needs.


#14

It is working ok now. I can figure out what needs to be done to quiet it a bit. Right now it's metal on metal so I put some temporary padding to quiet is a bit. Works well. Thanks,


Possibly Related Threads…
Thread Author Replies Views Last Post
  HP82143A printer font question Christoph Giesselink 2 1,147 03-05-2012, 03:18 PM
Last Post: Christoph Giesselink
  HP-41 printer interface question. (To the M-code gurus out there) Diego Diaz 2 1,332 01-29-2012, 12:18 PM
Last Post: Diego Diaz
  9815A/S option ROM Joel Setton (France) 0 790 03-08-2011, 12:43 PM
Last Post: Joel Setton (France)
  9815A manual Joel Setton (France) 0 741 05-21-2010, 04:25 PM
Last Post: Joel Setton (France)
  hp 9815a/s program tapes frankabc 3 1,344 10-28-2009, 09:46 AM
Last Post: Joel Setton (France)
  hp 9815a/s repair frankabc 33 7,015 09-28-2009, 03:26 PM
Last Post: Joel Setton (France)
  Question about HP-IL Printer Namir 9 2,195 09-18-2009, 04:57 AM
Last Post: Namir
  Thermal Printer Paper for 82143A Printer? Gordon Hamachi 1 1,082 02-03-2008, 03:05 PM
Last Post: Randy
  hp 9815a repair frankabc 6 1,862 10-16-2007, 12:27 AM
Last Post: frankabc
  HP 9815A repair frankabc 7 2,005 08-25-2007, 02:26 AM
Last Post: frankabc

Forum Jump: