Det
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LASER EXPOSURE
SM
6-31
B039/B040/B043
6.6.2 AUTO POWER CONTROL (APC)
The LD driver IC drives the laser diode. To prevent the intensity of the laser beam
from changing because of the temperature, the machine monitors the current
passing through the laser diode (LD). The machine adjusts the current to the laser
diode by comparing it with the reference level from the reference circuit.
This auto power control is done just after the machine is turned on and during
printing.
The laser diode power is adjusted on the production line.
NOTE: Do not touch the variable resistors on the LD unit in the field.
LD Drive Board
L D
P D
+ 5 V L D
Sync
Detector
X L D E N B
+ 5 V L D
Video Data
(1 bit)
X D E T P
G N D
A P C _ S H
L D
P D
1
M 6 1 8 8 0
B039D013.WMF
Содержание LD013
Страница 1: ...001129MIU SERVICE MANUAL B039 B040 B043 B120 RICOH GROUP COMPANIES...
Страница 2: ......
Страница 3: ...SERVICE MANUAL B039 B040 B043 B120 RICOH GROUP COMPANIES...
Страница 4: ......
Страница 5: ...B039 B040 B043 B120 SERVICE MANUAL 001129MIU...
Страница 6: ......
Страница 8: ......
Страница 10: ......
Страница 26: ......
Страница 30: ......
Страница 31: ...INSTALLATION...
Страница 32: ......
Страница 61: ...PREVENTIVE MAINTENANCE...
Страница 62: ......
Страница 66: ......
Страница 67: ...REPLACEMENT AND ADJUSTMENT...
Страница 68: ......
Страница 124: ......
Страница 125: ...TROUBLESHOOTING...
Страница 126: ......
Страница 140: ...SERVICE TABLES...
Страница 141: ......
Страница 192: ...DETAILED SECTION DESCRIPTIONS...
Страница 193: ......
Страница 269: ......
Страница 270: ...AUTO REVERSE DOCUMENT FEEDER B379...
Страница 271: ......
Страница 300: ...DOCUMENT FEEDER B387...
Страница 301: ......
Страница 323: ......
Страница 324: ...PAPER TRAY UNIT B384...
Страница 325: ......
Страница 344: ...PAPER TRAY UNIT B385...
Страница 345: ......
Страница 348: ...Paper Tray Unit B385 DRIVE LAYOUT SM 10 3 B385 1 3 DRIVE LAYOUT 1 Paper Feed Motor 2 Paper Feed Roller B385V103 WMF 1 2...
Страница 361: ......
Страница 362: ...SPECIFICATIONS...
Страница 363: ......
Страница 373: ...B120 RLA only...
Страница 374: ......
Страница 378: ......
Страница 379: ...FAX UNIT B404...
Страница 380: ......
Страница 382: ......
Страница 383: ...INSTALLATION...
Страница 384: ......
Страница 392: ......
Страница 393: ...PREVENTIVE MAINTENANCE...
Страница 394: ......
Страница 396: ......
Страница 397: ...REMOVAL AND REPLACEMENT...
Страница 398: ......
Страница 401: ...Fax Unit B404 SPEAKER SM 3 3 B404 3 4 SPEAKER A Fax unit 2 2 B Speaker 2 1 B404R500 WMF B404R501 WMF A B...
Страница 402: ......
Страница 403: ...TROUBLESHOOTING...
Страница 404: ......
Страница 416: ...SERVICE TABLES...
Страница 417: ......
Страница 489: ......
Страница 490: ...DETAILED SECTION DESCRIPTIONS...
Страница 491: ......
Страница 497: ......
Страница 498: ...SPECIFICATIONS...
Страница 499: ......
Страница 510: ...FIRMWARE HISTORY...
Страница 511: ......