CP60 and CP60 Plus Service Manual 2-3
Sensors
All of the optical sensors in the CP60 and CP60 Plus printers are of the open
collector type, and are configured to be active-low with a pull-up resistor on the
output. When the sensor is not active (or not connected at all) the control board
sees a high voltage (5V) at the Signal input. When the sensor is active, it shorts
Signal to Ground. The diagram below is a simplified representation of an
interruption sensor.
Name Function
Card Input
The card input sensor is an interruption sensor that detects the presence
of a card at the entry of the printer and registers the trailing edge of the
card for printing.
For the clear card option, this sensor is replaced with a reflective sensor.
Printhead Cam
As the printhead cam rotates, a flag on the cam interrupts the beam of
the cam sensor. This allows the printer to know the position of the
printhead lifters. The printhead lifters lift the printhead away from the
platen roller when not printing.
Swingarm Open
(Cover arm)
The swingarm open sensor detects when the swingarm is open. The sensor
itself detects when the swingarm is closed, but the signal is inverted
elsewhere in the system.
Note: The user information and Diagnostics refer to this as a cover arm
sensor.
Ribbon Index
The ribbon index sensor is used to determine the position of the print
ribbon panels. The sensor bounces a beam off the reflective sticker on the
printhead. When the index mark or K-panel on the ribbon passes between
the sensor and the reflector, the beam is broken (not reflected). The Y, M,
C, & T panels do not interrupt the beam.
Ribbon Motion
The ribbon motion sensor is a two-channel optical interruption sensor that
detects slots on the ribbon encoder wheel. The encoder wheel is located
on the ribbon cartridge. Internally the sensor body contains a pair of
standard interruption sensors.
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