I bought a broken one to use for parts and one of the things I was
secretly hoping was that the flex circuit would be bad so I would have
the excuse to rip it out and make a set of duplicate gerbers from a
flatbed scan of it.
On Tue, Oct 22, 2024 at 10:56?PM gren via groups.io
<hrgerson@...> wrote:
The Hp 2225a ThinkJet InkJet printers are really very nice, compatible with many Hp instruments and provide easy screen/data printout directly from the instrument, often with the push of just one Hp button on the instrument.
Much criticism of the 2225 has been directed at the "leaking" cartridge & corrosive ink.
-- But really this can be managed by removal of the cartridge (when not printing for long periods of time), storing it in a small
Rubber Maid type container, and periodic cleaning of spilled ink.
Otherwise, the Hp ThinkJet technology is superb, and a 1st for Hp of that era (ca. 1984).
( For fun, and amazement, read the Hp Journal May 1985 describing the development of the Hp ThinkJet, and peek at one of the developers stories in Hp Measure magazine, I will dig up that reference later ).
Several frequent breakdown issues occur with the Hp 2225a HP-IB inkjet printer:
A]
The Print Head electrode contacts frequently become corroded due to prolonged contact soaking in the corrosive Ink; where either the contacts themselves become corroded Or the contact-flex cable juncture develops a micro-crack, causing some of the 12 print head "character" nozzles to not function ( non printing ).
A1]
A repair can be had by following the excellent Repair Log "Fixing the ThinkJet" , by Martin Hepperle, September 2016.
( a .pdf is now in the Hp 2225 File Section herein ). One needs to buy an Hp Q7453a Carriage Assembly to do this.
A2]
Flex head electrode cracks can be repaired with Silver (Ag) paint ( Silberleitlyck 3gm Art No.: 530042 ),
as described in the below YouTube video
by atkelar:
{ Note this YouTube provides a guide for complete disassembly & reassembly of the 2225a HP-IB printer }
B]
The Hp 2225 can fail to turn on Or suffer from a Mains power receptacle Rifa-type filter death (or short),
which recently happened to me. This repair is also covered, and rebuilt, by atkelar, in his YouTube video.
C]
PS recapping. This also happened to my 2225a printer, & also covered by atkelar.
Note:
atkelar described using an older NOS 51604a Print cartridge, expired 5 yrs earlier,
printed well, with good results !
TonyG has provided an excellent alternative Hp 2225a repair with a YouTube video swapping the whole front print section including the Carriage Assembly from a 2225 parts mule:
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