To bring this story to an end the printer is now operational, the two lamps in the pre heater were open and have been replaced and the print head was indeed faulty, an 840 head has been fitted in its place and printing is fine.
Thanks for your reply,
I learnt a quick way to check the 2 bulbs in the heater assembly on an 840 without having to remove the unit,pins 3 & 5 (from left)on the bottom row of the assembly socket, with plug removed, should read 20 Ohms if both bulbs are ok.
The socket is accessible with the right...
Good morning,
firstly thanks to all of you that take the time to provide solutions, I've learnt a great deal about Xerox issues since joining recentlty.
My problem is with an 850 with error code 13.004.43:92648.
I now know that it could mean that the left side heater on the print head is at...
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