Specifications

3. The Electronics. The electronics include:
• Four main control logic PCBs in the logic module
• Three additional printer control PCBs
• Connector circuitry
4. The Power Supply. The power supply includes:
• Two main PCBs located in the power module
• Two additional power supply PCBs
• A switch box
• Miscellaneous components
The location of the major components can be seen in Figures 2–1 and
2–2.
2.2 The Enclosure and Environment
This section describes the safety interlock switches and the cooling fans.
2.2.1 Interlock Switches
1. Striker Bar Open Switch
This switch is located just behind and to the right of the paper
thickness indicator. It provides a signal to the SMIM board which is
used to inhibit printing and provide status information.
2. Ribbon Weld Sensor
The absence of the ribbon cartridge is detected by the ribbon weld
sensor.
3. Paper Low Switch
This switch is located at the top of the bottom left hand tractor. It
causes:
• The printing action to cease.
• An audible alarm.
• [L o P] display on the display panel.
2–4 THEORY OF OPERATION