Summa S Class 2 - Summa S Class 2: UD-Encoder Diagnostics; Summa S Class 2: Front Media Sensor Check; Summa S Class 2: Back Media Sensor Check; Summa S Class 2: OPOS Sensor Diagnostics

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10.2.4 UD-encoder
Move the knife up and down to change this value. In case this value does not change, then
the linear encoder in the cutter head is defective. Replace the cutter head.
10.2.5 Front sensor
This sensor is used to check for the front edge of the media and the media presence. (Un-)
covering the sensor should result in a change of this value. An uncovered sensor should
display a value near zero. Covering with white media should display a value around 400.
Clean the sensor. Replace the sensor (KIT-2034). The front media sensor is wired to J10 on
the main board.
10.2.6 Back sensor
This sensor is used to detect the rear edge of the media and the media presence. An
uncovered sensor should display a value near zero. Covering with white media should
display a value around 400. Clean the sensor. Replace the sensor (KIT-2034). The rear
media sensor is wired to J11 on the main board.
Voltages can be measured with reference to grounding (e.g. heatsink): yellow wire (FRONT
pin 1) is +5V, green wire (FRONT pin 2) is +4.4V, and is wired to the yellow wire (REAR pin
1) and is also 4.4V, green wire (REAR pin 2) is 3.8V: the infrared LEDs of the two sensors are
wired in series. Red wire (FRONT pin 3 and REAR pin 3) is +5V. Output voltage on the brown
wire (FRONT pin 4) and orange wire (REAR pin 5) depends if the media sensors are covered,
the color of the media backing, and how close the media is to the sensor. Voltage can go up
to +2V.
10.2.7 OPOS sensor
Use test sheet MI9902 (part of 1NC40-67031: Calibration Jigs) to verify correct working of
the OPOS sensor: moving the sensor over the white area, a value of 120 should be displayed.
Move the sensor over the black area: the value should be 1940. Move above the gray area:
the value should be between 400 and 700. In case it is not possible to meet these values,