THEORY GUIDE Scan/Erase
10DEC05
TG4825-1
Page
79 of 120
1. The MCPU BOARD A2 sends an “Erase” command to the MSC BOARD A1, which sends
a signal to the SLOW SCAN MOTOR to start the erasing operation.
2. The SLOW SCAN MOTOR actuates and moves the SCREEN into the erase position
determined by the ENCODER counts.
3. The SLOW SCAN MOTOR stops and waits for a response from the MCPU BOARD A2.
4. The MCPU BOARD A2 sends the “Erase” command and time to the MSC BOARD A1,
which actuates the ERASE LAMPS.
5. The ERASE LAMPS illuminate for 2 - 16 seconds to remove the image from the SCREEN.
6. When the SCREEN is erased, the MSC BOARD A1 sends the “Erase Done” status to the
MCPU BOARD A2.
Note
• The MSC BOARD A1 and the MCPU BOARD A2 are not visible in the graphic.
• The length of time the ERASE LAMPS illuminate is determined by the highest pixel code
value of the image that was scanned. If one pair of LAMPS is not operating, the time
increases by a factor of 2. If more than one pair of LAMPS is not operating, a message
displays on the TOUCH SCREEN MONITOR.
LAMP CURRENT SENSORS CS1 - CS5
Each pair of ERASE LAMPS has one BALLAST. A LAMP CURRENT SENSOR monitors the
electrical current to each BALLAST.
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