9-I. Exposure Lamp - Minolta EPI 054 User Manual

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 MECHANICAL/ELECTRICAL
98.04.24
1174SBM0901A
9-1. Exposure Lamp
An AC halogen lamp is used as the Exposure Lamp.
As the exposure level is adjusted on the control panel, the duty ratio of the pulse of AVR
Remote from the Master Board changes to increase or decrease the Exposure Lamp volt-
age, thereby changing the image density.
In Photo mode, the voltages are varied on a level 5V lower than the manual Exposure Lamp
voltages.
Manual EXP Setting 9
Lamp Voltage
–8
Difference (V)
At Manual Exposure Setting 1 only VG is reduced, thereby giving a lamp Voltage differ-
ence equivalent to +8V.
Control Signal
AVR Remote
PWB-A PJ14A-3
Signal (LA1)
If reduction copies are made using large size paper, the trailing edge of the first copy
moves past the Transport Roller Sensor after the SCEND signal for the second copy has
been generated. If the Exposure Lamp is turned ON for the second copy at the same tim-
ing as the first one, therefore, the image for the second copy is produced on the trailing
edge of the first copy. To prevent this from occurring, the Exposure Lamp is turned ON for
the second and subsequent copies when all of the following conditions are met:
• Approx. 0.8 sec. or more have elapsed after the first copy deactivated the Transport
Roller Sensor.
• The Transport Roller Sensor output is HIGH.
• The SCEND signal for the second copy is output.
8 7 6 5
–4 –2 –1 Reference
ON
L
M-21
4 3 2 1
+1 +2 +4 +4
1174T13MCA
OFF WIRING DIAGRAM
H 6-D