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Printer - Brother 110 Laserprinter
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Topic: Printer - Brother 110 Laserprinter (Read 2378 times)
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anishkgt
Frequent Contributor
Posts: 769
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Printer - Brother 110 Laserprinter
«
on:
January 16, 2017, 04:39:00 pm »
Hi All,
Am trying to test this board of a Brother Laser printer 1110. Would the
heat-on
on
pin 3
switch ON the heating drum, if connected to GND on the board ?
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Cupcakus
Contributor
Posts: 42
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Re: Printer - Brother 110 Laserprinter
«
Reply #1 on:
January 17, 2017, 07:49:01 am »
Without a schematic I'm not sure how helpful I can be, but I've worked on a fair share of laser printers... You can be sure a relay of some sort turns on the fuser filament, is there voltage on heat-on?
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anishkgt
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Re: Printer - Brother 110 Laserprinter
«
Reply #2 on:
January 17, 2017, 07:50:20 am »
Thank cupcakus! Yes there is it is pin 3
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Cupcakus
Contributor
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Re: Printer - Brother 110 Laserprinter
«
Reply #3 on:
January 17, 2017, 07:58:49 am »
Well I'd briefly connect it to ground and if you hear a relay switch you have your answer. Not knowing this printer I would not run it like that for any length of time. Be very careful, high voltage will be present.
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xavier60
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Re: Printer - Brother 110 Laserprinter
«
Reply #4 on:
January 17, 2017, 09:24:36 am »
Looks like there is a triac on the live side, and likely to be driven by some sort of opto-coupler. Then I wonder what the relay is for.
«
Last Edit: January 17, 2017, 09:27:29 am by xavier60
»
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HP 54645A dso, Fluke 87V dmm, Agilent U8002A psu, FY6600 function gen, Brymen BM857S, HAKKO FM-204, New! HAKKO FX-971.
anishkgt
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Re: Printer - Brother 110 Laserprinter
«
Reply #5 on:
January 17, 2017, 09:25:07 am »
Yea I guess will just quickly connect the relay on pin and heat-ON on
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anishkgt
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Re: Printer - Brother 110 Laserprinter
«
Reply #6 on:
January 17, 2017, 09:35:58 am »
Yea there is one, am guessing that is controlled by pin 3 shown in the second pic.
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xavier60
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Re: Printer - Brother 110 Laserprinter
«
Reply #7 on:
January 17, 2017, 09:43:54 am »
Voltage must not be applied directly to the LED side of opto-couplers, there needs to be a current setting resistor in series.
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HP 54645A dso, Fluke 87V dmm, Agilent U8002A psu, FY6600 function gen, Brymen BM857S, HAKKO FM-204, New! HAKKO FX-971.
anishkgt
Frequent Contributor
Posts: 769
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Re: Printer - Brother 110 Laserprinter
«
Reply #8 on:
January 17, 2017, 09:45:27 am »
Not sure if the opto has anything to do here. Will have to see how pins 2 and 3 works when connected to GND.
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jdraughn
Regular Contributor
Posts: 106
Re: Printer - Brother 110 Laserprinter
«
Reply #9 on:
January 17, 2017, 01:27:37 pm »
I would measure resistance between that pin and gnd, and that pin and logic voltage to see if it's pulled up or pulled down.
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anishkgt
Frequent Contributor
Posts: 769
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Re: Printer - Brother 110 Laserprinter
«
Reply #10 on:
January 17, 2017, 04:11:30 pm »
Would the logic voltage be 5 ?
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