7.5.2 Toner End Detection
When little toner remains in the toner tank, the amount of toner supplied to
the development unit decreases, and the image of the ID sensor pattern gets
lighter.
When the Main PCB detects the low ID sensor pattern density condition
(Vsp/Vsg
≥
1/9) more than three times in a row during the toner near end
condition (physical check), or when main PCB counts 2000 or more copies
made since the toner near end condition, the toner end condition is displayed
on the CRT screen and copying is inhibited until the toner cartridge is
replaced.
Copy
Toner End
Copy from
Near End condition < 2
K
(N.E~)
No
Yes
Yes
No
No
Vsp / Vsg
≥
1/9 3 times
Yes
Near End
A171D500.wmf
TONER DENSITY DETECTION AND SUPPLY
31 July 1995
2-52
Summary of Contents for FT8680
Page 3: ...SECTION 1 OVERALL MACHINE INFORMATION ...
Page 8: ...MEMO 31 July 1995 SPECIFICATIONS 1 5 ...
Page 23: ...6 5 IMAGE OVERLAY MODE 2ND SIDE A171V505 wmf PAPER PATH 31 July 1995 1 20 ...
Page 24: ...SECTION 2 DETAILED SECTION DESCRIPTIONS ...
Page 133: ...Timing Chart 1 Stack 2 Paper Feed A171D551 wmf A171D552 wmf 31 July 1995 DUPLEX 2 109 ...
Page 159: ...SECTION 3 INSTALLATION ...
Page 177: ...SECTION 4 SERVICE TABLES ...
Page 229: ...SECTION 5 REPLACEMENT AND ADJUSTMENT ...
Page 362: ...SECTION 6 TROUBLESHOOTING ...