Ink Mark Sensor Level Adjustment - Epson Stylus Pro 7400 Service Manual

EPSON Stylus Pro 7400/7800/9400/9800

5.3.10 Ink Mark Sensor Level Adjustment

This adjustment is made automatically. The Ink Mark Sensor emits light on the paper
and the platen, and receives the reflected light. The printer automatically adjusts the
sensitivity of the sensor by examining the received light intensity. The procedure
below explains how to print and read the adjustment values.
Paper Used
Size: 24" (Stylus Pro 7400/7800)
44" (Stylus Pro 9400/9800)
Type: Doubleweight Matte Paper
Procedure
1. Turn the printer ON.
2. Start up the Adjustment Program and select [Ink Mark Sensor Level
Adjustment].
3. Click the [Run] button to print adjusted values.
4. The following are explanations of the printed values. Check the values in B to
E if they meet the standard.
A: Indicates which photoreceiver; PW1 or PW2 received the light when
the platen gap is set to 1.2.
B: Switches between 1 and 0 depending on the received light intensity.
The LED light intensity changes according to this value.
C: Indicates the light intensity emitted from the LED. There is no
standard for the light intensity control.
D: Indicates the light intensity reflected off the paper. The values should
be within the range of 230 to 236.
E: Indicates the light intensity reflected off the platen. The value should
be a single-digit number.
5. Click the [Finish] button.
Adjustment
Figure 5-42. [Ink Mark Sensor Level Adjustment] Screen
A
[PW1 (PG=1.2)] I/O: 1,
[PW2 (PG=1.2)] I/O: 1,
Figure 5-43. Ink Mark Sensor Adjusted Values
Basic Adjustment
B C D
D/A: 162, A/D: 234, A/D (2): 7,
A/D: 236,
D/A: 91,
Revision B
E
328