Ricoh FT5233 Service Manual page 74

12 February 1992
5.6 ERASE LAMP CONTROL TIMING
(Upper paper tray, black development unit)
Correction 1
200
Start key
ON
Start Key
Main Motor
Erase Lamp Unit
Charge Corona
Unit
T1
T1: When the start key is pressed, the main motor and all the blocks of the
erase lamp unit turn on simultaneously.
T2: The timing is corrected twice according to the combination of the
selected development unit and the paper feeding station. (The above
timing is for the combination of the black development unit and the upper
paper tray.)
T3: The charge corona turns on for the original image 330ms after
correction 2.
T4: The erase lamp unit changes its mode from the lead edge erase to the
side erase 611ms after correction 2. This side erase period differs
depending on the paper size. (In case of the full size mode):
T5: The charge corona turns off when the scanner starts the return
movement. 98ms after that the erase lamp changes its mode from the
side erase to the trail edge erase.
T6: The erase lamp and the main motor turn off simultaneously.
0
Correction 3
Correction 2
Scanner
172 0 Return Start
Side
611
Erase
All Blocks ON
330
Grid Bias
for Image
T2 T3 T4 T5
Paper size
A3
B4
A4 lengthwise
A4 sideways
2-45
98
All Blocks ON
Period
2,355ms
2,044ms
1,650ms
1,189ms
ERASE
T6