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Are there any alternative to epson ic A2098, C6082?

Discussion in 'General Electronics Discussion' started by ngzek, Aug 22, 2015.

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  1. ngzek

    ngzek

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    Aug 4, 2015
    I found Epson printer ic A2098 and C6082 were shorted.These ic are not found in the market. Is there any alternative ic to replce these Epson ic? Please help
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    without knowing what their purpose is ... no one could help

    but they are probably purpose designed, so highly unlikely anyway
     
  3. 73's de Edd

    73's de Edd

    3,086
    1,302
    Aug 21, 2015
    .

    Sir ngzek . . . . .



    It would be nice for you to have given the model of the Epson printer to research.
    Strange that you are assuming the devics to be integrated circuits
    I am suspecting them just to be common bipolar power transistors.
    Those numbers are akin to the common assigment used for foreign transistors.
    There are certainly HUGE (to the power of 10) quantities of smaller cased small signal transistors
    coming off of production lines daily.
    And almost from day one, there was a problem in getting a part number on small cases.
    Be it by the use of printing via ink or intermediate times by the use of acid etch or todays time of
    use of a laser to burn the markings on.
    There was MINIMAL area to print info on the case, so it took no time at all to see that there were
    the familys of 2SA-2SB-2SC-2SD-2SK identifiers, with the REAL info being in the 3rd character ID
    and the numbers to follow. SO . . . . since the 2S was always being redundant on ALL of the families,
    so why not just OMIT it.

    So that is what I almost universally see as being done on that family of foreign transistors.
    The most common used transistors I usually see, are merely marked with the short form of A733 or C945
    which marks on the transistors cases much easier than the transistors FULL IDENTIFIER of 2SA733 or 2SC945.

    In your case the A2098 and C6082 would be fully identified as 2SA2098 and 2SC6082.
    In which case if you reference their specs:

    The 2SA2098 is going to be a silicon PNP bipolar power transistor with a 30 watt rating @ 60V and
    15 Max amps and a gain of 180 with a Ft of 200Mhz (of which that last spec should be of no relevance
    on use in a printer.) and a casing in a TO220ML profile.

    The 2SC6082 is going to be a silicon NPN bipolar power transistor with a 25 watt rating @ 60V and 15
    Max amps and a MINIMUM gain of 50 with a Ft of 195Mhz (of which that last spec should be of no relevance
    on use in a printer.) and a casing in a TO220ML profile.

    They are almost being a NPN and PNP matching set.

    Here are URL's for getting ALL of their specs:

    http://alltransistors.com/transistor.php?transistor=56652
    http://alltransistors.com/transistor.php?transistor=49602


    73's de Edd
     
  4. davenn

    davenn Moderator

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    Sep 5, 2009
    a couple of sharp and well lit pic's of the devices would confirm if they are ICs or transistors
     
  5. ngzek

    ngzek

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    Aug 4, 2015
    Thank you 73's edd for your detail information
     
  6. ngzek

    ngzek

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    Aug 4, 2015
    Printer model is epson1390
     

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  7. davenn

    davenn Moderator

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    Sep 5, 2009
    yeah OK ... so they are transistors as Edd suggested

    2SC6082 and 2SA2098
    They or their equivalents should be readily available

    the unknown is a temperature sensor .... most likely a diode or a thermistor


    Dave
     
  8. ngzek

    ngzek

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    0
    Aug 4, 2015
    Davenn temperature sensor! Ok thanks for your help.
     
  9. davenn

    davenn Moderator

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    Sep 5, 2009
    yes, these are usually screwed to the heatsink to monitor the power transistor(s) temperature
     
  10. ngzek

    ngzek

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    Aug 4, 2015
    I don't know why this manufacturer mention nothing about it? Its a trouble for some people like me. Yes you are right Davenn it is screwed to heatsink.
     
  11. 73's de Edd

    73's de Edd

    3,086
    1,302
    Aug 21, 2015
    Sir ngzek . . . . .


    By using your forthcoming model number of the Epson unit:

    And then with my further REALLY-searching of the unit, reveals that two complementary sets of those given transistors are used to send
    precise timed HIGH current pulses to the units’ printer heads.


    Sooooooo . . . . I don't know if you spent a bunch of your HARD earned munneys on that unit, when being new or were merely "gifted" of
    one of the units . . . . but with it being inoperative.


    With ALL of the motors that unit is using, I might have easily suspicioned some few power transistors additionally feeding/ switching power
    to them.


    But . . . no . . . there are just two tandem sets of the complementary units, designated as Q6-Q9 and Q10-11.

    REFERENCING:


    You can get a free service manual of the 3900 unit at:

    http://elektrotanya.com/epson_stylus_photo_1390_1400_1410.pdf/download.html

    Newbie to that site? ? ? ? ?

    (WAIT until the fine little print of all the massive contractual info displayed at the left bottom/central corner area exhibits a change from having
    its few words of underlined "Please wait, processing" makes a transition, to instead, its saying "Get manual", then you place the mouse
    cursor/pointer atop that area.


    And then . . . .AND THEN . . .you keep rolling your chair as FAR back away from the computer keyboard as you POSSIBLY can, and then extend
    your right arm and its end index finger out as FAR as it will possibly reach and then BARELY be able to reach to the mouse’s left tact switch .
    Then you dub'l click it and run like HELL, as we certainly don't know WHAT is going to happen next!


    With manual, then downloaded, you will find its troubleshooting's relevant schematics within its last few final pages, just prior to #168.

    TROUBLESHOOTING:


    Specifically . . . I have placed a separate small snippet of that most relevant schema info with this post, just below, with the CN10 CN11 CN12
    connector cables pinouts of the printer head also being included.


    My "markups" are being made in PINK, along with some BLUE and GREEN paths of the high current drive levels to the printer heads.

    Initially we see that the top left block diagram shows the power supply info, with my entries in PINK that feeds to the main board of the unit..

    Dropping down to the right center of the schematic, we see that the two sets of power transistors are used in totem-pole fashion and pass out
    their HIGH current trapezoidal drive pulses as the BLUE and GREEN feed lines. They are interconnects with the CN 10-11-12 terminals and then
    route to the printer head(s).


    There is DIRECT Emitter to Collector connectivity of the series transistors, with NO resistive current limiters inline, so those lines are going to hit
    that printer hard as heck.


    (Limited only by the feedback sample sent back to IC 10 via those broken BLUE and GREEN lines feeding back to its pins 12 and 18


    As for your "mystery device" photo (for Thermal sensing ? )

    By the schematic page below, as it’s far right referencing, you can see that the most common look alike manufacturer’s symbol trade logos don't
    quite match up with yours, with the closest being the Signetics, if being right sloped to an italic type of font and having a folding around of the S ends.


    I am not finding it showing up in the close proximity of your power transistor cluster, with all of the ancillary resistors on the schematic around them,
    just being mere 1/4 watt rated units, associated with establishing proper base drive biasing, from their incoming timing data pulses from IC10 pins
    11- 13-17 and 19. Then a couple of H.F. R/C snubbers dropping off those BLUE and GREEN lines to ground as R159/C128 and R164/C129.


    Sooooooo . . . . you might just have to check out where that unit was physically wired into and mechanically located / mounted to , when being compared
    against the schematic.


    There IS being feedback sent from the printer head(s), of the units’ thermal situation, via pin 1 of the CN 10 connector which is labeled as TH, so you just
    might see if that line leads to the device you have pulled if it was located on the print head assembly heat sinking.


    (My markup is the PINK star at that CN 10's connector pin 1.)

    How does that unit test, either resistance wise and /or as a semiconductor with its directional conductance characteristics?

    ALSO how did the two bipolar power semis check out, as per any "fried” or open junctions?

    EVALUATING:


    A shakedown test might involve the unit being in power down condition and measuring the resistance being on the BLUE and GREEN drive lines, considering
    that the pair of transistors that were NOT affected by meltdown are probably still tied into a valid printer head, while the other crashed semis were connected to
    a printer head that has shorted down windings or a shorted winding to frame condition / failure.


    AN ASIDE OBSERVATION:


    Looks like it will be up to you for finding the wiring within the print heads or connecting motors, as they are considered replacement units and their specific sub
    assembly wiring is not shown for tracing or troubleshooting.


    If you don't find a "burnt" out / shorted printer head, you might just luck out in getting the unit up and functional again.

    HOWEVER finding involved mechanical and / or any software related problems just might then prove to be a killer of your hopes.

    To wit . . . on manual page 137 . . . do take note of their special dedicated test instrument, which utilizes an input from a goose neck mounted electret mike for its
    picking up the "pluck"/frequency of a timing belt for the proper setting of its tensioning.


    (Akin to tuning a guitar string.)

    Thassssittt . . . . . update us of your findings, info or further queries.


    Behold ! . . . . . al fin . . . . . le schematique:

    <img src="http://s24.postimg.org/paazslis3/Servicing_an_Epson_1390_Printer.png" class="bbCodeImage LbImage" alt="[&#x200B;IMG]" data-url="[​IMG] ">


    Alternate hosting of the schematic . . .but if coming up to small, it may need to be mouse clicked upon.
    http://s24.postimg.org/paazslis3/Servicing_an_Epson_1390_Printer.png



    73’s de Edd


    .
     
  12. ngzek

    ngzek

    26
    0
    Aug 4, 2015
    Sir 73’s de Edd you are very helpful and I have learn lots from you. Thank you
     
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