Ribbon Sensor Voltage Checking - SATO CL408e Service Manual

Section 4. Electric Checks and Adjustments
4.9b Ribbon Sensor Voltage Checking
There is no adjustment POT for the ribbon sensor on the CL408e/412e. The CE POT on
the main logic board has no effect on the voltage values. The voltage values only can be
taken off the connector SEN4 on the display.
Refer to illustrations below.
PIN 1 = Brown
PIN 2 = Red
PIN 3 = Orange
PIN 4 = Yellow
PIN 3 (Signal) and PIN 4 (Ground) are the test pins. Low value when the carbon assembly
is rotated is around 0.16V . High value is around 4.8V .
If the voltages you monitor are at or close to these voltages, the ribbon out problem is
being caused by improper ribbon tension adjustment.
If the voltages are not at or close to these values, it indicates a component problem. The
order suggested for component replacement trouble shooting is ribbon sensor first, display
panel next, and finally the main logic board.
PULL SEN4 CONNECTOR
SLIGHTLY AWAY FROM
DISPLAY PANEL
CONNECTIOR SO THAT
VOLTAGE PROBES CAN BE
ATTACHED TO THE
EXPOSED PINS
SATO CL408e/CL412e Service Manual
Page 4-14
PN 9001078
Rev. A