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Louie
Louie, Technician
Category: Printers
Satisfied Customers: 12577
Experience:  25+ yrs. experience in the field and 5+ yrs. online, down to component level.
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I have a Canon BJC-85 portable printer. I think I may have a

Customer Question

I have a Canon BJC-85 portable printer. I think I may have blown a fuse. How do I get inside it?
Submitted: 11 months ago.
Category: Printers
Expert:  Louie replied 11 months ago.

Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.

Initially, have you checked the bottom for screws?

Customer: replied 11 months ago.
There is one small screw on the bottom. I loosened it but it is not clear that it is holding the chasis.
Expert:  Louie replied 11 months ago.

There are locking tabs.

Would a diagram serve your need please?

Expert:  Louie replied 11 months ago.

Please click HERE.

Customer: replied 11 months ago.
Please. How do you unlock the tabs? Do I first remove the screw?
Expert:  Louie replied 11 months ago.

Yes, remove the screw.

A jeweler's screwdriver would be need to push the locking tabs (slightly sideways) to unlatch. It would help if another screwdriver is used to keep pried apart the top cover and bottom half thus preventing the unlocked tabs from locking back in.

Customer: replied 11 months ago.
I am not at home. I need a smaller phillips head to get that screw out. I was able to unlock the tabs on each end but the middle is being held, I guess, by that little screw.
Customer: replied 11 months ago.
Is there a fuse inside?
Expert:  Louie replied 11 months ago.

Yes there are; a fuse immediately along pin 1 of connector CNDC1 labeled as F1. There is another fuse labeled as ICP1.

Customer: replied 11 months ago.
It will have to wait until I can get a small screwdriver. Tomorrow sometime.
Expert:  Louie replied 11 months ago.

I understand; tomorrow or when able.

Customer: replied 11 months ago.
Louie -
Okay. I got the cover off but where are the fuses? Do I have to do more disassembly?
Ken
Expert:  Louie replied 11 months ago.

Hi again Ken,

Please refer to the above linked exploded diagram.

The fuses are in the circuit board marked as 3 / middle board shown in FIGURE 4 CONTROL BOARD & LOWER COVER.

Customer: replied 11 months ago.
I found the fuse F1. That is the one need the power inlet. How do you remove it? With a pair of needle nose pliers? How do you test it - with a voltmeter?
I am still looking for ICP1. What part of the circuit does that one protect?
Expert:  Louie replied 11 months ago.

To serve as common reference, please post back with clear picture of the board.

Click HERE.

Customer: replied 11 months ago.
Here are some pictures of the inside of the printer. On the one picture you can see the fuse near the power inlet.
Expert:  Louie replied 11 months ago.

Thanks.

ICP1 is the fuse for the regulator IC14.

These are not readily visible from the pictures.

Customer: replied 11 months ago.
Okay I found the two fuses. Is it possible to replace them? Is it a common part?
Customer: replied 11 months ago.
How do you test them?
Expert:  Louie replied 11 months ago.

To test, set the multi-meter to continuity / Ω function. A good fuse would read 0.0Ω out-of-circuit.

Customer: replied 11 months ago.
Here is a picture of IC14 and ICP1.
So I would have to remove the fuse to test it?
How hard are these fuses to find? F1 and ICP1?
Expert:  Louie replied 11 months ago.

Yes, preferably de-soldered.

The fuses can still be checked while still in circuit as it would still read 0.0Ω if good.

Availability; sourcing should not be that difficult.

Customer: replied 11 months ago.
Okay. I'll try that.
Expert:  Louie replied 11 months ago.

Cheers.

Expert:  Louie replied 11 months ago.

Hi again,

Do you still need help with this?