Xerox Phaser 840 Service Manual page 59

Table 2-3 POST (Power On Self Test) Error Messages (cont'd.)
PS, PE and Front
Front Panel Panel
LEDs Error
Code
21 21.06
21 21.07
21 21.08
Soft Error 22.01
Soft Error 22.02
Description
Left printhead jetstack thermistor is out of range. Replace the
printhead.
Right printhead jetstack thermistor is out of range. Replace the
printhead.
Printhead reservoir thermistor is out of range. Replace the
printhead.
Maintenance Kit counter is not responding. Check for bent pins on
the counter. Reseat then replace the maintenance kit.
Intermittent response from the maintenance kit counter. Reseat the
maintenance kit, cycle power then replace the maintenance kit.
Error Codes and Messages 2 - 43