Diagnostic Codes: The copy count window will display LL, when you press the 0 key, you will get the subcode so that:

LL-1 is a fuser problem, probably no heat.
LL-3 also fuser related, may be thermistor.
LL-31 Clock sensor or no main drive.
LL-62 Return scan problem.
LL-64 Scan problem.

Other codes for the 1020 are:
A9= Platen out of position,
E5=Open interlock,
J1=Out of toner
L6 (which we'll probably never see) = Key counter.

Drum availability: We had the hardest time finding Drums for these not too long back... so we solved the problem. Here is the information about how to use a 660 drum to work perfectly good in the 1020 using an Extension Ring: (we sell the drum with the extension for $100.-)...

Refer to the illustration below...

1. Find the two hash marks on the face of the Timing hub.
2. Counting clock-wise, about 1/4" past the third Mold pin mark, is a small raised dot (this marks the beginning of the image area).
3. Install the Timing Hub on the end of the drum with the narrower (1/4") margin. Going clock-wise, install the Timing Hub so that the dot is just past the blank portion of the drum.
4. Place the Extension Ring on the other end of the drum & bolt it all together.
   

   

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