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HP 82240: Difference between revisions
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The printer is powered by four AA batteries and can accept alkaline or NiMH cells. External power is supplied via a common nonpolar 5.5mm/2.1mm AC jack. The manual calls for 9-12V AC or DC at 500-1500mA and thus can be used with most common barrel jack power supplies. The original power adapter HP 82241A is rated for 9V AC at 13.5VA. The printer works on either internal, external or a combination of both. | The printer is powered by four AA batteries and can accept alkaline or NiMH cells. External power is supplied via a common nonpolar 5.5mm/2.1mm AC jack. The manual calls for 9-12V AC or DC at 500-1500mA and thus can be used with most common barrel jack power supplies. The original power adapter HP 82241A is rated for 9V AC at 13.5VA. The printer works on either internal, external or a combination of both. | ||
The IR receiver diode is mounted to the bottom left of the printer when viewed from the top, hidden behind an IR window. Printing distance is dependent on background IR levels, with correspondingly shorter range under incandescent fixtures or in sunlight. It is usually possible to print at 15cm or more when the IR diode is in field of view indoor. | |||
==HP 82240A== | ==HP 82240A== | ||
==HP 82240B== | ==HP 82240B== | ||
The B revision was introduced together with the HP48 series of calculators. Notably, this version implemented the new ECMA94 character set of the HP48 generation. To remain backwards compatible with previous printers, HP 82240 defaulted to using modified Roman-8 character set unless an escape sequence was received, which switched it into ECMA 94. The calculator can also be set to enable OLDPR which implemented a translation layer to allow printing with limited characters from A variants on the 48 and later. | |||
Two quality of life improvement was made to the 82240: a red LED was added next to the IR receiver diode behind the window to indicate to the user that the machine is on. The machine now turns itself into standby after roughly 10 minutes of inactivity to save battery life, turning off the indicator LED, unless the mains power is connected. The user has to manually cycle the switch to re-enable printing. | |||
Hardware wise, the HP 82240B switched to a green double-sided PCB with additional circuits to implement hardware standby function. | |||
==Supported calculators== | ==Supported calculators== | ||
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*[[HP 39G]] | *[[HP 39G]] | ||
*[[HP 39GS]] | *[[HP 39GS]] | ||
*[[HP 41]]C, CX, CV (with IR-Interface module HP | *[[HP 41]]C, CX, CV (with IR-Interface module HP 82242A) | ||
*[[HP 42S]] | *[[HP 42S]] | ||
*[[HP 48S]] | *[[HP 48S]] | ||
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====Other devices==== | ====Other devices==== | ||
== Issues == | |||
While the underlying cause is unclear, when a jam develops, the HP 82240 printhead can burn the thermal paper black or in worse case, ignite it. It is thus not recommended to have it print unsupervised. | |||
The Seiko printhead uses two rubber rollers for paper ingest, which are glued to the main roller bar. This part can fail and run free due to age subjected to storing conditions. A tell-tale sign when this issue develops is the shrinking of line margin or persistent failure to feed. Replacing the entire printhead assembly is required in this case. | |||
The battery contact is poorly soldered with the wire and may be subjected to corrosion due to leaking alkaline battery. It is recommended to check this part for failure as the battery contacts also directly presses on the PCB from the underside, thus free floating power lead can cause short and circuit damage if allowed to float free. | |||
== Repair & Parts Availability == | |||
The HP 82240 is held together with 6 screws, two in the battery compartment and four under rubber feet at the bottom of the calculator. A long screwdriver bit is necessary to access these. | |||
The printhead can be replaced with Seiko Industries MTP201-G166(E) which replaced the original printhead in Seiko listings. Five wires must be soldered. This printhead is also used for a variety of medical and scientific instruments. | |||
The rubber pads can be easily replaced with 10mm diameter rubber feet with height of more than 1 mm. | |||
==Compatible 3rd party printers== | ==Compatible 3rd party printers== | ||
Due to the widespread adoption of HP 82240 in various industries, other manufacturers are known to have designed compatible, or partially compatible devices. Today some of these are still in production or can be easily found second hand at much cheaper prices. | |||
==External resources== | ==External resources== | ||