The Eltron Company P310 manual Circuit Descriptions

CHAPTER 3

3.4CIRCUIT DESCRIPTIONS

As shown in Figure 3-2, P310 Printers have the following circuits:

•Print Head Circuiry

•Motor Control Circuitry

•Status Circuitry

•Interface Circuitry

•Operator Panel Circuitry

•Optional Encoder and/or Smart Card Circuitry

If possible, spend some time with this figure. The intent is to offer another perspective to descriptions given in other parts of the manual.

Most of the circuitry resides on the CPU Board. The CPU Board controls the Card Feeder, Printer Station, reception of Parallel data from the host computer, and to some degree the optional Smart Card and Magnetic Encoder Stations.

The figure depicts soldered-in circuit blocks without shading. The lighter shading indicates ICs in sockets. The darker shading indicates external assemblies connected to the CPU Board by cabling.

The Micro Controller determines operations through data and address busses and control signals. Flash memory contains the associated microcode and allows the downloading of firmware for updates. Note also that the Address Bus primarily serves transfers involving the Flash and RAM chips. Most other data transfers occur with a chip enable or other Micro controller signal.

Two types of status are collected—sensor and parameter. Analog Comparators receive inputs from LED-Photo Transistor sensors. Two types exist—reflective and beam interrupt. Analog Comparators receive sensor signals on one input and a programmable voltage on the other. The Micro Controller establishes the comparator thresholds during calibrations.

Motors exist in two types—dc, and stepper. All associated driver ICs have socket mounts in support of IC-level replacement. The Stepper Motor Driver IC has a heat sink. Dc motors receive 24-volt dc power. This same supply powers a dc-to-dc converter that delivers 5-volt power to the remaining circuitry.

3-10 980264-001 Rev.B