enx magazine

With the differences behind us, this is a good opportunity to talk about one particular problem which plagues the 35 ppm versions of these machines (C35, M35, Pro35, DC535, WC 232, Pro232)- Scan Home Position Failures.

Photo #6: C35 CCD Problem Spot. This area heats up causing the resistors to fail.

The machine will display "Scanner has failed to initialize, Copying and Scanning unavailable". Often this is accompanied by what sounds like a Bonham drum solo as the Exposure Scanner Cartridge slams repeatedly into the right side of the scanner. If you go into the Diagnostics and look at the Fault History, you will find the code 14-110 in the recent faults. That code means "Scan Home Sensor Failure". This gets us all looking at the Scan Home Sensor but as it turns out, the sensor is not usually the cause. If you want to make sure, you can swap the Scan Home Sensor with the identical sensor: the Platen Angle Sensor (near the left rear corner of the scanner, a plunger drops down when you close the platen. This sensor sees that plunger drop down). The true cause is a loss of the 5 volts which is used by the sensor. The 5 volts are generated on the CCD Board (Charge Coupled Device- the board behind the lens which turns the light of the image into an electrical signal). See Photo #5 and #6. If you look at the upper rear of that board you will probably find some scorched and destroyed resistors. Apparently a component heats up and then four resistors suffer and fail. With the 5 volt generation no longer happening, the machine cannot see the scanner when it gets to the home position. For some reason, the exposure lamp will also fail to come on under these circumstances. If you run the Exposure Lamp from diagnostics, it will flash on momentarily and then shut right back off.

Originally the parts book did not show any way to buy the CCD Board without buying the entire Scanner Module which sold for over $1600.-. Recently, a kit has surfaced which is a CCD Board and a shim kit to get the thing into the correct position in relation to the lens. That kit sells for around $625.- under the part number 604K35300. A preferred solution is to send the entire lens & CCD Board Assembly for repair, without disturbing the screws which hold the board to the metal assembly on which it's mounted (refer back to Photo #5 to see how that Lens / CCD Assembly looks). For that operation, folks will use a scribe to mark exactly where the Lens / CCD assembly is mounted to the metal frame of the scanner module and send the assembly in for repair. Then reinstall it in the same place it was originally mounted. The most critical spatial relationship is the lens to the CCD, so the idea is to keep that relationship intact so that less trouble will be had getting the piece back into position.

That is all for this month. Happy Repairs everybody. Hope you are all enjoying your summer!

Britt works for The Parts Drop, a company whose primary business is providing parts, supplies and information for Xerox brand copiers, printers and fax machines. You can find more information, including many of Britt's past ENX articles on their website, www.partsdrop.com. If you'd like to read more about Xerox brand office equipment, there's also a complete listing of past articles under contributing writers on the ENX website (www.ENXMAG.com).

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