: Extremely compact, often weighing approximately 0.05 lbs (22 grams) in its PLC variant.
When 24V DC is applied to Pin 3 (IN A), it first encounters a (D1) connected to VCC+ for reverse polarity protection. A second diode (D2) shunts any voltage above 30V to ground via a transient voltage suppressor (TVS) – typically a P6KE33A.
| Pin | Label | Function | |-----|-------|-----------| | 1 | VCC+ | Positive supply (18-30V DC) | | 2 | GND | Ground reference | | 3 | IN A | Input channel A (active high) | | 4 | IN B | Input channel B (active high) | | 5 | OUT A | Open collector output A | | 6 | OUT B | Open collector output B | | 7 | SEL | Mode select (pulls to GND for PNP mode) | | 8 | NC | No connection / Test point | cmki-p3x circuit diagram
Now that you understand the internal schematic, here is a practical test setup to verify your CMKI-P3X module.
are the most common failure points in older CMKI-P3X boards; as they age, they can leak or lose their ability to hold a charge, leading to distorted audio or system crashes. Replacing these "aged" components is often enough to restore a board to full functionality. Further Exploration : Extremely compact, often weighing approximately 0
The board is frequently built on a rated PCB, ensuring high flame retardancy for industrial and consumer safety. Key technical features often include:
: Frequently equipped with VGA ports, S-Video connectors, or proprietary multi-pin headers. | Pin | Label | Function | |-----|-------|-----------|
Have you successfully repaired or cloned a CMKI-P3X module? Share your oscilloscope captures and PCB layouts in the comments below. For more deep-dives into obsolete industrial circuits, subscribe to our newsletter.