HP 2820, 2840, 2830 manual Removal and replacement

Step 6: secondary transfer	96
Step 7: separation	97
Fusing stage	98
Step 8: fusing	98
Step 9: roller charging (auxiliary transfer belt cleaning roller)	98
Step 10: roller charging (transfer-belt cleaning roller)	99
Step 11: transfer belt cleaning	99
Step 12: drum cleaning	100
Print cartridge	102
Imaging-drum E-label	103
Scanner and ADF functions and operation	104
Scanner functions	104
Scanner operation	104
ADF operation	105
ADF paper path and ADF sensors	105
ADF jam detection	106
Fax functions and operation	107
PSTN operation	107
To receive faxes when you hear fax tones	107
The fax subsystem	107
Formatter in the fax subsystem	108
LIU in the fax subsystem	108
Safety isolation	108
Safety-protection circuitry	108
Data path	109
Hook state	109
Downstream current detection	109
Hook switch control	109
Ring detect	110
Line current control	110
Billing (metering) tone filters	110
Fax page storage in flash memory	110
Stored fax pages	111
Advantages of flash memory storage	111
5 Removal and replacement
Chapter contents	113
Removal and replacement strategy	114
Required tools	114
Screws	114
Electrostatic discharge	115
Before performing service	116
After performing service	116
Post-service tests	116
Test 1 (print-quality test)	116
Test 2 (copy-quality test)	117
Test 3 (fax-quality test)	117
Test 4 (memory-card test)	117
Parts removal order	118
User-replaceable parts	119

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