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HP-19C repaired
05-21-2017, 03:30 PM
Post: #5
RE: HP-19C repaired
Thanks for the compliments!

When comparing the HP-19C printer with the HP-97 there is of course the smaller HP-19C paper size, but there are some other differences.

The printer mechanic of the HP-19C is made for an undirectional motor, which always runs in the same direction. If the motor is running continuously forward, the printhead is running back and forth, reversed automatically by a rather tricky mechanic. Therefore the motor electronics is designed more simple and cannot reverse the motor direction.

The HP-97 printer instead has a more sophisticated motor electronics, a so called H-bridge, which can reverse the motor direction any time. The mechanic would block on either side if the motor would run continuously in the same direction.

Although both printers are printing unidirectional, the HP-97 is faster, because when short print lines occur, the motor reverses earlier to get to its home position, while the HP-19C has to go the full distance to the end of the line and back.

Another HP-97 small improvement is the paper out switch, which produces an "Error" if the printer is out of paper. The HP-19C doesn't have a paper out detection.

Bernhard

That's one small step for a man - one giant leap for mankind.
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Messages In This Thread
HP-19C repaired - PANAMATIK - 05-20-2017, 04:05 PM
RE: HP-19C repaired - Matt Agajanian - 05-20-2017, 09:09 PM
RE: HP-19C repaired - Paul Dale - 05-20-2017, 11:21 PM
RE: HP-19C repaired - Dr. Mabuse - 05-21-2017, 02:34 PM
RE: HP-19C repaired - PANAMATIK - 05-21-2017 03:30 PM
RE: HP-19C repaired - AndiGer - 05-21-2017, 07:18 PM
RE: HP-19C repaired - Geoff Quickfall - 05-21-2017, 11:19 PM
RE: HP-19C repaired - PANAMATIK - 05-23-2017, 06:00 PM
RE: HP-19C repaired - Dr. Mabuse - 05-23-2017, 06:57 PM
RE: HP-19C repaired - PANAMATIK - 05-24-2017, 02:03 AM
RE: HP-19C repaired - Geoff Quickfall - 05-24-2017, 04:08 AM
RE: HP-19C repaired - PANAMATIK - 05-24-2017, 10:25 PM
RE: HP-19C repaired - PANAMATIK - 06-02-2017, 05:42 PM
RE: HP-19C repaired - BobVA - 06-02-2017, 06:04 PM
RE: HP-19C repaired - PANAMATIK - 06-02-2017, 06:42 PM
RE: HP-19C repaired - Dr. Mabuse - 06-02-2017, 06:17 PM
RE: HP-19C repaired - rprosperi - 06-02-2017, 08:25 PM
RE: HP-19C repaired - PANAMATIK - 06-02-2017, 09:07 PM
RE: HP-19C repaired - rprosperi - 06-03-2017, 12:25 AM
RE: HP-19C repaired - PANAMATIK - 06-03-2017, 11:28 AM
RE: HP-19C repaired - david sanz - 06-07-2017, 12:05 PM



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