Epson AcuLaser C8500 Service Manual page 135

EPSON AcuLaser C8500
Counter A and Counter C are triggered simultaneously when
the WASTE TONER SENSOR detects continuous 30
seconds "toner full" (output: High).
Case where "toner full" is Case where "toner full" is still
no longer detected before detected when Counter A
Counter A counts "1250" counts "1250" and Counter C
and Counter C counts "480 counts "480 seconds"
seconds."
Counter B is triggered simultaneously when the WASTE
TONER SENSOR no longer detects "toner full" (output:
Low). (Counter A and Counter C continue to count.)
Case where "toner full" is Case where Counter B
again detected before counts "1625" while "toner
Counter B counts "1625." full" is still not detected.
The value of Counter A is checked when the WASTE
TONER SENSOR once again detects "toner full."
Case where Counter A has Case where, "or Counter C
not yet counted "1250." has already counted "480
seconds."
Operating Principles
"Toner full" is
determined. (Case 1)
Counter A, Counter B
and Counter C are
reset. (Case 4)
"Toner full" is
determined. (Case 2)
Figure 2-59. Waste Toner Box Full Detection Control
Counter B is triggered simultaneously when the
WASTE TONER SENSOR no longer detects
"toner full" (output: Low). Toner is determined to
be full when the WASTE TONER SENSOR
again detects "toner full" before Counter B
counts "1625." (Case 5)
"Toner full" is determined when Counter A
counts "1250," or Counter C counts "480
seconds." (Case 3)
Revision C
2-58