Secondhand Healthcair GK420G PAP Mainboard

Objective AI Report

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Report date: 28.01.2026

Puritan Bennett GoodKnight 420G CPAP Control Board Analysis Report

Device Identification

The product examined in the visuals is the main control board (Motherboard/PCB) of an electronic device. Upon examining its design, components, and special labeling, it has been determined that this board belongs to a medical device, specifically a CPAP (Continuous Positive Airway Pressure) device. The board is the central management unit housing the device’s screen, control buttons, and main processor.

Brand and Model

As a result of detailed analysis and label examination, the brand and model of the device to which the board belongs have been definitively identified:

• Brand: Puritan Bennett (Currently part of Covidien/Medtronic)
• Product Series: GoodKnight 420 Series
• Compatible Model: GoodKnight 420G (Entry-level CPAP model)
• Model Identification Evidence: The phrase “Carte GK420G V2.1” on the white label on the board directly indicates the “GoodKnight 420G” model name. Furthermore, the code “M-313930-00” on the label perfectly matches this manufacturer’s spare part numbering system. (“Carte” means “Card” in French, and this series was generally manufactured in France).

Originality

The industrial-grade soldering, specially designed integrated circuit layout, and manufacturer-specific barcoded tracking label on the board indicate that the product is a 100% Original OEM (Original Equipment Manufacturer) part. It is not an aftermarket or copied production; it is a direct factory-issued component.

Areas of Use

This board is the main brain of the Puritan Bennett GoodKnight 420G model CPAP device used in the treatment of sleep apnea. It can be used for the following purposes:

• Repair of a faulty GoodKnight 420G device (in case of screen failure, button non-responsiveness, or main board burnout).
• Medical device spare parts stock.
• Electronic restoration of the device.

Quantity Information

A total of 1 unit of electronic control board is present in the visuals. The device’s outer casing or other parts (motor, hose, etc.) are not visible in the visuals.

General Condition

Visually, the product is in used but clean condition. No signs of corrosion, burn marks, or liquid contact are observed on it. The protective coatings on the PCB are intact.

Physical Deformation

The physical integrity of the board is complete. No broken, cracked, or dented corners are present. The connector pins are straight. Only minimal, usual dust accumulation due to usage and disassembly can be observed.

Electronic Component Analysis

The components on the board have been examined in detail:

• Processor (MCU): On the rear side of the board, an Infineon SAF-C509 series microcontroller is present. This component manages all logical operations of the device.
• Buzzer (Audible Warning): The white, circular component visible on the rear is a piezoelectric element that emits the device’s alarm and warning sounds.
• LCD Screen: On the front side, there is a custom-made liquid crystal display (LCD) showing pressure values and settings. No cracks or stains are visible on the screen glass.
• Keypad: Around the screen, there are 4 micro switches (buttons). These buttons control the device’s power on/off and ramp/pressure settings. They appear mechanically sound.
• Capacitors: No swelling or leakage has been detected in the electrolytic capacitors (silver-colored cylinders) on the rear side.

Accessories and Connections

The board includes the following integrated components:

• DC Power Input: A black cylindrical DC power socket is present at the top of the board.
• Antenna/Sensor Area: The upward-extending “L”-shaped structure of the board is designed to fit into the vertical section of the casing; a large gold-plated chassis grounding area for RF shielding is visible here.

Battery Status

On the rear side of the board, there is a vertically positioned coin cell battery holder with a battery inside (likely CR2032 type). This battery allows the device to retain time and treatment data in memory during power outages. While the battery’s lifespan cannot be determined from the visual, no oxidation is observed in the battery holder.

Label Information

The label data on the board are as follows:

• Part Name: Carte GK420G V2.1 (Card Version 2.1)
• Reference Code: M-313930-00
• ID Code: 439 518397
• PCB Standard: 94V-0 (Flammability rating)

Potential Fault Risk

No critical physical defect that could damage the board is observed in the visuals. However, considering the device’s manufacturing year, there is a high probability that the BIOS battery (memory battery) on the board may be depleted. This is a situation that can be remedied with a simple battery replacement and does not prevent the board from functioning.

Note: Although it has been confirmed that the board belongs to the “GoodKnight 420G” model, Zebra brand barcode printers known by the “GK420” code are also available in the market. These two products are completely different. The product we examined is definitely not a printer part, but a respiratory device (CPAP) board.