ASML PCB Card 4022.428.1023 for PAS 5000/2500

Board Description

The ASML PCB Card 4022.428.1023 is a peripheral I/O interface board designed for the PAS 5000/2500 wafer stepper family. It provides the necessary connectivity between the main controller and external devices such as environmental sensors, vacuum gauges, and safety interlocks. This board is essential for monitoring system health and enabling safe operation.

Hardware Configuration

The card is a standard 6U Eurocard with 96‑pin DIN connectors. It features a CPLD (complex programmable logic device) that decodes the address bus and manages data flow. The board offers 8 optically isolated digital inputs (5‑24 V), 8 digital outputs (24 V, 0.3 A), and 4 analog inputs (0‑10 V, 8‑bit). It also includes a dedicated interlock chain that can bypass the system’s emergency stop signals.

Technical Specifications

• Bus Compatibility: VME, non‑intelligent slave (A16/D16)

• Isolation Voltage: 1.5 kV RMS (optical)

• Input Current: 10 mA per digital input (active high)

• Output Type: Open‑collector, 24 V DC, 0.3 A sink

• Analog Input Range: 0‑10 V, accuracy ±1 %

• Power Requirements: +5 V DC @ 0.8 A, +12 V DC @ 0.2 A

• Operating Temperature: 10 °C to 45 °C

Functional Role

In the PAS 5000/2500, this PCB card interfaces with the wafer pre‑aligner sensors, reading the edge‑detection signals and sending control pulses to the alignment motor. It also monitors the vacuum chuck pressure via its analog inputs; if the pressure drops below a threshold, the card immediately signals the main processor to abort the current exposure sequence. The interlock logic on the board ensures that all safety doors are closed before the laser shutter opens.

Installation Procedure

Power down the stepper and remove the backplane cover. Insert the card into the designated slot (usually slot 6) and secure it with the two retaining screws. Connect the front‑panel ribbon cable to the termination panel that routes signals to the sensors and actuators. After powering up, verify that the board is detected by the system diagnostics. If the system does not recognize the board, check the address switch settings (binary dip switches) – they should match the slot number.

Testing and Calibration

After installation, run the “I/O Test” routine from the maintenance menu. This test will exercise each input and output channel and report any failures. The analog inputs should be calibrated against a known voltage source using the trim pots on the board. Calibration is recommended annually to maintain accuracy. The board also has a test‑point header that allows probing of key signals without removing the card.

Replacement and Ordering

When replacing a faulty board, ensure that the new unit has the same part number 4022.428.1023 and revision level. The board is supplied with a compliance sheet and a two‑year warranty. If the exact part number is not available, consult ASML for an equivalent I/O board; however, mixing different revisions may require a system software update.