Video Amplifier; Ultra Sonic Sensor - Hitachi HT-4139-28 Maintenance Manual

7.8.4.3 VIDEO Amplifier

NOTE:
Gain (Video amplifier gain), ODD(o
Display the best gain value for scanning side and scanning color.
･
The best gain value
After cleaning or replace the lamp, if it is between 0300～03FF, the light intensity is too low so check below..
(1) If the filament of both sides of the lamp are lit?（no disconnection?）
(2) If the mirror and/or lens in the scanning part is not contaminated. If so, clean them.
(3) If there is any obstacle in the light path. If so remove it.

7.8.4.4 Ultra Sonic Sensor

Level of the Ultra sonic sensor under various condition
Mark Gain Value
0001（same）
SS0
0001（same）
SS1
SS2 best gain with calibration
SS3 best gain with calibration
SSP best gain with calibration
NOTE: To detect dual paper feed at the best gain, find out the gain value and threshold of the sensor.
Get the best gain with the 1
Get the threshold value with after 2
00F0）
dd numbers ), EVN (even
: 0000～03FF （Offset is fixed as 0100）
Sensor
Output
No
Yes
No
Yes
Yes
st
sheet so that the SSP will be (0060～00C0).（Gain 0001～0007）
nd
sheet so that detect the dual feed. (threshold value 004B～
[Video amplifier surface and back]
Display of video gain of the CCD sensor
numbers )
[Ultra sonic sensor]
Device unique data to detect multiple feeding by
the Ultra sonic sensor
Sheet Measured Data
Level w/o sensor output (off-set)
No
Sensor output
No
Off-set at the best gain
No
Sensor output at the best gain
No
Sensor output when the light is blocked
with the test sheet (040-7-4: 72kg paper）
Yes
【should be about 0060～00C0】
REV0 2010.02.15
-H7-19-