3.3 GRID BIAS VOLTAGE CORRECTION
The grid bias voltage differs depending on the modes and correction factors
(see the process control section).
3.3.1 Base Grid Bias Voltage
There are two base grid bias voltages, one for image and the other for sensor
patterns (ID sensor pattern and V
R
pattern).
Grid bias voltage for image (Vgi):
-745 V
Grid bias voltage for sensor pattern (Vgp): -500 V
The high voltage supply board - CTBG is adjusted at the factory to output the
correct Vgi and Vgp. When the high voltage supply board - CTBG is replaced
in the field, the variation of the grid bias output should be corrected by
entering the grid voltage correction data in SP mode #62.
3.3.2 Manual ID Correction
When the image density is selected by
the manual image density keys on the
operation panel, the grid bias voltage is
changed as shown in the above table.
The image density for each manual ID
level is also controlled by the exposure
lamp voltage and the development bias
voltage. The manual ID correction for
the grid bias voltage is applied only to
levels 6 and 7. This is to expand the
difference of image density at levels 6
and 7 from the other manual ID levels.
ID Level Grid Bias Voltage
1
Vgi
±
0V
2
Vgi
±
0V
3
Vgi
±
0V
4
Vgi
±
0V
5
Vgi
±
0V
6
Vgi +50V
7
Vgi +50V
NOTE: Vgi
(Grid bias voltage
for image)= –745V
Det
a
il
ed
Descriptions
12 February 1992
DRUM CHARGE
2-21
Содержание A085
Страница 1: ...RICOH FT4227 FT4427 FT4727 A085 A087 A088 PARTS CATALOG First Edition August 1992 RICOH COMPANY LTD ...
Страница 3: ...FT4227 FT4427 FT4727 A085 A087 A088 ...
Страница 6: ...3 LOCATION OF UNIT ...
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Страница 13: ...10 1 EXTERIOR 1 A085 A087 A088 ...
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Страница 17: ...14 3 OPERATION PANEL A085 A087 A088 ...
Страница 19: ...16 4 PLATEN COVER A085 A087 A088 ...
Страница 21: ...18 5 OPTICS SECTION 1 A085 A087 A088 ...
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Страница 27: ...24 8 OPTICS SECTION 4 A085 A087 A088 ...
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Страница 31: ...28 10 BY PASS FEED TABLE A085 A087 A088 ...
Страница 33: ...30 11 PAPER FEED TRAY A085 A087 A088 ...
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Страница 37: ...34 13 TRAY LIFT SECTION A085 A087 A088 ...
Страница 39: ...36 14 LCT SECTION 1 A087 A088 ...
Страница 41: ...38 15 LCT SECTION 2 A087 A088 ...
Страница 43: ...40 16 LCT SECTION 3 A087 A088 ...
Страница 45: ...42 17 VERTICAL TRANSPORT SECTION A085 A087 A088 ...
Страница 47: ...44 18 PAPER REGISTRATION A085 A087 A088 ...
Страница 49: ...46 19 DRUM SECTION 1 A085 A087 A088 ...
Страница 51: ...48 20 DRUM SECTION 2 A085 A087 A088 ...
Страница 53: ...50 21 DEVELOPMENT UNIT 1 A085 A087 A088 ...
Страница 55: ...52 22 DEVELOPMENT UNIT 2 A085 A087 A088 ...
Страница 57: ...54 23 CLEANING UNIT A085 A087 A088 ...
Страница 59: ...56 24 T S CORONA UNIT A085 A087 A088 ...
Страница 61: ...58 25 TRANSPORT SECTION A085 A087 A088 ...
Страница 63: ...60 26 FUSING UNIT 1 A085 A087 A088 ...
Страница 65: ...62 27 FUSING UNIT 2 A085 A087 A088 ...
Страница 67: ...64 28 PAPER EXIT SECTION 1 A085 A087 A088 ...
Страница 69: ...66 29 PAPER EXIT SECTION 2 A085 A087 A088 ...
Страница 71: ...68 30 FRAME SECTION 1 A085 A087 A088 ...
Страница 73: ...70 31 FRAME SECTION 2 A085 A087 A088 ...
Страница 75: ...72 32 FRAME SECTION 3 A085 A087 A088 ...
Страница 77: ...74 33 FRAME SECTION 4 A085 A087 A088 ...
Страница 79: ...76 34 DRIVE SECTION 1 A085 A087 A088 ...
Страница 81: ...78 35 DRIVE SECTION 2 A085 A087 A088 ...
Страница 83: ...80 36 ELECTRICAL SECTION 1 A085 A087 A088 ...
Страница 85: ...82 37 ELECTRICAL SECTION 2 A085 A087 A088 ...
Страница 87: ...84 38 ELECTRICAL SECTION 3 A085 A087 A088 ...
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Страница 91: ...88 40 DUPLEX UNIT 1 A088 ...
Страница 93: ...90 41 DUPLEX UNIT 2 A088 ...
Страница 95: ...92 42 DUPLEX UNIT 3 A088 ...
Страница 97: ...94 43 MAIN CONTROL BOARD A085 A087 A088 ...
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Страница 99: ...96 43 MAIN CONTROL BOARD A085 A087 A088 ...
Страница 102: ...99 44 MEMORY BOARD A085 A087 A088 ...
Страница 104: ...101 45 AC HARNESS A085 A087 A088 ...
Страница 106: ...103 46 DC HARNESS TYPE 2 A085 A087 A088 ...
Страница 108: ...105 47 DC HARNESS TYPE 4 A085 A087 A088 ...
Страница 110: ...107 48 FUSING UNIT HARNESS A085 A087 A088 ...
Страница 112: ...109 49 LCT HARNESS A087 A088 ...
Страница 114: ...111 50 DECAL AND DOCUMENT A085 A087 A088 ...
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Страница 122: ...PARTS INDEX ...
Страница 154: ...SECTION 1 OVERALL MACHINE INFORMATION ...
Страница 163: ...SECTION 2 DETAILED SECTION DESCRIPTION ...
Страница 165: ...SECTION 3 INSTALLATION ...
Страница 178: ...SECTION 4 SERVICE TABLES ...
Страница 201: ...SECTION 5 REPLACEMENT AND ADJUSTMENT ...
Страница 227: ...FT5233 5433 5733 SERVICE MANUAL ...
Страница 230: ...SECTION 1 OVERALL MACHINE INFORMATION ...
Страница 255: ...SECTION 2 DETAILED SECTION DESCRIPTIONS ...
Страница 373: ...SECTION 3 INSTALLATION ...
Страница 403: ...SECTION 4 SERVICE TABLES ...
Страница 449: ... 6 Duplex Tray PREVENTIVE MAINTENANCE SCHEDULE 12 February 1992 4 46 ...
Страница 456: ...SECTION 5 REPLACEMENT AND ADJUSTMENT ...
Страница 575: ...SECTION 6 TROUBLESHOOTING ...