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Dolev 800 - Electronic System - Standard Controller -
 Strobe 5 Board - (503D27353)

Std. Contrlr .   
FSB 280
FCO 18366
FCO 16850
FCO 16620
FCO 16080
FCO15913
FCO 19667

Description
Adjustment and Testing
Replacement
Check

Description

Control Circuit Blocks
Functions
Theory of Operation

Control Circuit Blocks

The control circuit blocks in the Strobe 5 board are:

PLL clock recovery circuit
Variable Line Delay
Microprogram controller
Correction LUT
16-bit ALU
Start-of-line delay circuit
Expose Clocks correction circuit
PLL Phase Compensation

Functions

The Strobe 5 Board (503D27353):

  1. Adjusts vertical and horizontal lines within the exposure area to right angles.

  2. Brings exposure lines to the correct length. Make the exposure width equal the requested size.

  3. Correctly positions exposure dots along a line.

  4. Provides continuously variable resolution in the range of 1000 - 5000 lines per inch.

  5. Adjusts for film thickness.

Theory of Operation

The Strobe board (503D27353) synchronizes the data that controls the laser spot during exposure. The board operates in full synchronization with the rotation of the spinner and carriage movement.

The principle function of the Strobe board is to multiply the clock frequency to produce a train of EXP CLK (STROBE) pulses after dimensional correction. Each EXP CLK pulse results in the exposure of one point on an exposure row. The EXP CLK pulses produced by multiplying the clock frequency synchronize data modulation.

The Strobe 5 is controlled by the controller CPU. It is based on fast ALU and field programmable gate array (FPGA). The board performs continuous resolution and dimension correction. Maximal vertical dimension correction capability is 25%. The maximal horizontal bow linearity correction capability is 200 dots resolution. It is possible to perform offsets in the vertical for OEM machines.\

Strobe 5 sends variable expose clock pulses over the plotter bus to the OMC board. The OMC transfers the clock pulses to the Data Unit. The encoder clock determines the frequencies sent by the PLL. The maximum frequency is 30 MHz.

Adjustment and Testing

Overview
Main Board Test Points
The four Strobe 5 Board LEDs

Overview

The board potentiometer, P1, is used to adjust the phase between the PLL reference and PLL feedback. The oscilloscope is attached to test points TP1 (PLL FEED) and TP2 (PLL REF). The expected Delta on the falling edge should be 50 nSec.

Main Board Test Points

Data Expo During exposure, you receive a stream of exposure clocks.
Sweep On Sweep On gives you an index signal that appears once per exposure row.

The four Strobe 5 Board LEDs

ALU ERR Problem with the microcode
ENSTB Appears as a steady light during an exposure.It shows that a steady flow of exposure clocks are arriving. If during exposure the LED is not lit, exposure clocks are not present.
PLL UNLOCK This red LED is relevent during exposure. It is weakly lit or brightly lit. When brightly lit, either there is a problem with the board or the dynamic optics encoder is not sending clocks.
PROG DONE This green LED is lit when the XILINK program is loaded.

Replacement

  1. Switch the machine OFF.

  2. Open the right side door of the Dolev 800 & the standard controller cover.

  3. Release the Strobe5 board and remove it from the crate.

  4. Install the new Strobe5 board.

  5. Close the right side door of the Dolev 800 & the standard controller cover and restore power.

Check

  1. Turn the machine on.

  2. Run Diagnostics and verify that the Strobe5 board diagnostic does not fail.

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