(From: Jon Fick (firstname.lastname@example.org).)
|Printer and Photocopier Troubleshooting and Repair Collection : HP Laserjet IIP error 52 - chip replacem..
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I was finally able to fix the printer by replacing the chip on the scanning
motor board rather than replacing the whole board. That's a $10 fix rather
than a $80 fix!
The surface-mount chip and an associated surface-mount resistor apparently run
hot in this application, and over time, darken the back of the printed circuit
- The resistor color bands indicate that it is 1 ohm. It measured 0.8 ohm
so I left it in place. I was able to obtain some data sheets for the chip.
Although the data sheet diagram is written in an oriental language it appears
that the resistor could indeed be a low value in that location so I didn't
- The chip part number is HA13456AMP. It is a surface mount device, a quad
package. It's leads are meant to be soldered, not plugged. With Solderwick
and a small iron the old chip came off easily. Be careful of the heat,
though, because it appears that the surface of the board can become slightly
delaminated. I also used a stereo microscope so I could be exacting as I
applied the heat.
I covered the scanner rotor before attempting anything because I didn't want to
have to clean the mirrors afterwards.
I also have the same chip in a different package that might actually be more
robust. It is the HA13456A, a long DIP package with triple-width ground tabs
in the middle of each side. It is electrically equivalent from what I can tell
and might be a good substitute if the flat pack fails early.
The printer came right up, and self test immediately printed two pages!
The chip came from: B & D Enterprises International, PO Box 460, Main &
Liberty Streets, Russell, Pennsylvania, 16345.
Their worldwide number, as well as tech support (really helpful) is:
814-757-8300 (800-458-6053 in the USA).
Their 24-hour fax number is: 814-757-5400
VISA, MASTERCARD, AMERICAN EXPRESS are accepted worldwide.
Each chip was $7.55. They have a $15 minimum order, so I ordered two, partly
to make the minimum order, and partly to have a spare.
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