Question about Xerox Phaser 7400/DX Laser Printer
The printer boots up but stops when the screen reads 14: real time clock
According to my service manual, this error is occurring during the Power On Self-Test. While it is a "soft" error, it normally can only be resolved by replacing the Image Processor Board.
But wait! There's more!
Here may be a way to reset without the expensive replacement:
The most likely cause is that the Image Processor Board has not successfully loaded
its NVRAM contents (instructions) into RAM. All print engine operation halts, and
will only become ready when the Image Processor Board successfully boots.
1. Check for media or debris in the paper path.
2. Power cycle the printer.
3. Verifying Image Processor Board failure:
a. Power-off the printer, and remove the Image Processor Board.
b. Power-on the printer. Wait at least 5 minutes while the print engine
initializes. If there was a problem with the Image Processor Board, it will
now not affect the Engine Control Board.
c. If characters appear on the Control Panel display, the Engine Control Board
is functional and the problem is most likely with the Image Processor Board.
d. Turn off the printer and reseat the Image Processor Board and turn on the
printer to determine if seating was the problem.
e. Perform a PostScript NVRAM reset, see "Postscript NVRAM Reset" on
f. Turn off the printer and systematically remove individual optional
components from the Image Processor Board to isolate a possible problem
g. Replace the Image Processor Board.
I wish you luck with this repair.
Posted on Jan 02, 2015
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Posted on Jan 02, 2017
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In your computer (as well as other gadgets), the battery powers a chip called the Real Time Clock (RTC)chip. The RTC is essentially a quartz watch that runs all the time, whether or not the computer has power. The battery powers this clock. When the computer boots up, part of the process is to query the RTC to get the correct time and date. A little quartz clock like this might run for five to seven years off of a small battery. Then it is time to replace the battery.
This does not explain why your computer would not boot, however. You would expect the computer to boot fine but have an incorrect time and date. The reason your computer would not boot is because the RTC chip also contains 64 (or more) bytes of random access memory (RAM). The clock uses 10 bytes of this space, leaving 54 bytes for other purposes. The BIOS stores all sorts of information in the CMOS RAM area, like the number of floppy and hard disk drives, the hard disk drive type, etc. If the CMOS RAM loses power, the computer may not know anything about the hard disk configuration of your machine, and therefore it cannot boot.
Many more modern computers are not quite so dependent on the CMOS RAM. They store the settings innon-volatile RAM that works without any power at all. If the battery goes dead, the clock fails but the computer can still boot using the information in the non-volatile RAM area. I would change the battery and make sure unit is unplugged and my other hand is touching the metal frame on the computer to stop static discharge. Blow out the inside of the computer completely.Start computer with case off and make sure all the fans run and don't sound like a siren.Replace anything not running.It may not boot if the BIOS can't see the hard drives. You might have to start computer and watch the screen and when it asks you to hit a key to get into like the bios do it and see if you can reset it. If nothing seems be running right maybe the power supply went out they are real cheep at Tiger Direct.
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