Basic Sequence of Operation

The Formatter PCA and the DC Controller PCA share information during printer operation. Connector J7 on the formatter and connector J207 on the DC controller form a link which operates as a serial data bus. This allows printer status, command information, and dot-image data to be passed between both controllers.

Standard Printer Operation

The following events take place during normal printer operation:

1 After the printer’s power is turned ON, the printer enters the Warmup period.

2 After the printer completes the Warmup period and is ready for operation, the DC controller sends a READY signal (RDY) to the formatter.

3 After the RDY signal is true and print data is ready to be transmitted, the formatter sends a PRINT signal (PRNT) to the DC controller.

4 After the DC controller receives the PRNT signal, the Initial Rotation period begins.

5 At the end of the Initial Rotation period, the DC controller sends a TOP OF PRINT signal (TOP) synchronized with a BEAM DETECT signal (BD) to the formatter. This initiates the Print period.

Functional Overview 5-33