16 April ’88
TONER END DETECTION
The CPU uses the image density sensor to detect a toner end condition. This
method is effective in both detect and fixed supply modes.
If Vsp becomes greater than 0.75 volt, the CPU determines that it is time to
add toner and starts blinking the Add Toner indicator.
After the indicator starts blinking, the operator can make up to 50 copies. If a
new toner cartridge is not added within that 50 copy interval, the Add Toner
indicator stops blinking (stays on) and copying is inhibited. The toner end
condition is reset by opening and closing the front cover.
COLOR TONER DENSITY DETECTION AND COLOR TONER
SUPPLY
1. Color Toner Density Control
When a color development unit is used, the CPU automatically selects the
fixed toner supply mode. SP Mode # 70 determines the supply amount.
The CPU calculates the threshold level for toner
color development installation procedure is
determined by calculating the average of Vsp
developer.
supply inhibition when the
completed.
This level is
and Vsg while using new
Since the fixed supply system is selected when in color toner mode, it is
necessary to inhibit toner supply if the toner density becomes high to prevent
over-toning. The CPU checks Vsp once in 10 copy cycles. If Vsp becomes
lower than the threshold level, the CPU stops supplying toner. Toner supply
resumes when Vsp rises above the threshold level again.
A RAM stores the threshold level data for the three colors. The CPU selects
the correct threshold level from this RAM after checking the color signal from
the color toner sensors. The power supply for the RAM has battery backup so
the data will not be lost if the power supply is disconnected.
The RAM stores not only the threshold level data but also the number of
copies made data with each color. This data can be displayed on the
operation panel by using SP Mode # 73.
Содержание FT4430
Страница 1: ...RICOH FT4430 S E R V I C E M A N U A L RICOH COMPANY LTD...
Страница 2: ...SECTION 1 OVERALL MACHINE INFORMATION...
Страница 3: ...Table of Contents SPECIFICATIONS OPERATION PANEL SECTION A SECTION B...
Страница 11: ......
Страница 12: ......
Страница 17: ...16 April 88 ELECTRICAL COMPONENT LAYOUT 1 14...
Страница 25: ...SECTION 2 DETAILED SECTION DESCRIPTIONS...
Страница 103: ...SECTION 3 INSTALLATION...
Страница 123: ...SECTION 4 SERVICE TABLES...
Страница 133: ...16 April 88 SERVICE PROGRAM MODE TABLE 4 8...
Страница 134: ...16 April 88 4 9...
Страница 135: ...16 April 88 4 10...
Страница 145: ...SECTION 5 REPLACEMENT AND ADJUSTMENT...
Страница 225: ...SECTION 7 DOCUMENT FEEDER...
Страница 228: ...16 April 88 MECHANICAL COMPONENT LAYOUT Feed Roller Pick up Roller Original Table Registration Rollers 7 2...
Страница 263: ...SECTION 8 SORTER...
Страница 266: ...16 April 88 MECHANICAL COMPONENT LAYOUT Exit Rollers 4 Bins 2 Bin Drive Wheel 5 Roller Drive Belt 3 Proof Tray...
Страница 281: ...SORTER CONTROL BOARD SCHEMATIC IOOV AC s 1 0 2 1 b 4 16 April 88 A024...
Страница 282: ...SECTION 9 LARGE CAPACITY TRAT...
Страница 285: ...16 April 88 MECHANICAL COMPONENT LAYOUT 1 Drive Wire 2 Drive Gears 3 Drive Pulley 4 Tray Wire 5 Lift Rods 9 2...
Страница 301: ...SECTION 10 EDITOR BOARD...
Страница 302: ...CONTENTS...
Страница 312: ...SECTION 11 TROUBLESHOOTING...
Страница 344: ...RICOH FT4430 A024 P A R T S C A T A L O G First Edition April 1988 RICOH COMPANY LTD...
Страница 346: ...1 EXTERIOR A024 April 30 88 2...
Страница 349: ...2 REGISTRATION A024 April 30 88...
Страница 351: ...3 PLATEN COVER AND CASSETTE A024 April 30 88...
Страница 353: ...4 PAPER FEED A024 April 30 88 8...
Страница 357: ...5 OPERATION PANEL A024 10 April 30 88...
Страница 359: ...6 FRAME A024 April 30 88 12...
Страница 361: ...7 OPTICS 1 A024 April 30 88...
Страница 363: ...8 OPTICS 2 A024 April 30 88 16 1...
Страница 365: ...9 AROUND DRUM A024 April 30 88 18...
Страница 368: ...10 35 CLEANING UNIT A024 April 30 88 20...
Страница 370: ...11 DEVELOPMENT UNIT A024 April 30 88 22...
Страница 373: ...I April 30 88 24...
Страница 375: ...13 PAPER TRANSPORT A024 April 30 88 26...
Страница 377: ...14 FUSING UNIT A024 April 30 88 28...
Страница 380: ...15 PAPER EXIT A024 April 30 88 10 6 30...
Страница 382: ...16 ELECTRICAL SECTION 1 A024 April 30 88 32...
Страница 384: ...17 ELECTRICAL SECTION 2 A024 April 30 88...
Страница 386: ...INDEX NO SYMBOL NO...
Страница 387: ......
Страница 390: ...19 FUSING LAMP DRIVE BOARD A024 April 30 88 38...
Страница 396: ...22 AC MAIN HARNES A024 April 30 88 113 118 103 44...
Страница 398: ...23 DC MAIN HARNESS A024...
Страница 400: ...24 FUSING UNIT HARNESS A024 2 101 104 April 30 88...
Страница 402: ...25 COUNTER HARNESS A024 50...
Страница 405: ...26 HARNESS PAPER FEED A024 1 J 52...
Страница 407: ...27 SPECIAL TOOL A024 April 30 88...
Страница 409: ...28 DECAL AND DOCUMENT April 30 88...
Страница 410: ...o BI 12 15 8 1 6 WARNING HIGH TEMP 9...
Страница 412: ...DF 39 A419...
Страница 414: ...1 DOCUMENT FEEDER I A419 April 30 88 2...
Страница 417: ...2 DOCUMENT FEEDER II A419 April 30 88 4...
Страница 420: ...3 DOCUMENT FEEDER Ill A419 April 30 88 6...
Страница 425: ...5 DF HARNESS A419 April 30 88 10...
Страница 427: ...CS 2070 A414...
Страница 428: ...1 Mini Sorter A414 2 2 Bin Motor Board A414 4 3 Sorter Harness A414 6 Parts lndex 9...
Страница 429: ...1 MINI SORTER A414 April 30 88 2...
Страница 434: ...RT 15 A912...
Страница 435: ...1 LCT I A912 2 2 LCT II A912 4 3 LCT III A912 6 4 LCT Board A912 8 5 LCT Harness A912 10 Parts Index 13...
Страница 436: ...1 LCT I A912 April 30 88...
Страница 438: ...2 LCT II A912 4...
Страница 440: ...3 LCT Ill A912 April 30 88...
Страница 442: ...3 SORTER HARNESS A414 April 30 88 120 115...
Страница 447: ...5 LCT HARNESS A912 April 30 88 110 122 10...
Страница 449: ...RE 11 A906...
Страница 450: ......
Страница 451: ...1 RE 11 A906 April 30 88 2 5 2 4 _ _ _ 2...
Страница 453: ...PARTS INDEX...
Страница 456: ...INTERFACE BOARD TYPE E A426...
Страница 457: ...1 interface Board A426 2 Parts Index 5...
Страница 460: ...PARTS INDEX...
Страница 462: ...SORTER ADAPTER TYPE E A918...
Страница 463: ...1 SORTER ADAPTER A918 April 30 88 2...