Secondhand Nihon Kohden JE-921A EEG Junction Box

Objective AI Report

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Report date: 03.01.2026

Nihon Kohden Neurofax EEG Electrode Junction Box Analysis Report

Device Identification and Product Description

The examined visuals contain an Electrode Junction Box (Electrode Junction Box / Input Box) and its accessories, belonging to an electroencephalography (EEG) system used for medical diagnosis and monitoring. The product is an interface unit used to transmit signals received from the patient’s head to the main EEG device. Installation fixtures and consumables are included.

Brand and Model Information

The writings and logos on the product have been examined in detail:

• Brand: The inscription NIHON KOHDEN is clearly visible with a blue logo on the lower part of the device’s front face.
• Model: Immediately below the brand, the text Neurofax, indicating the product series, is clearly legible.

Since no image of the rear label indicating the specific technical model code of the device (e.g., JE-921A) was shared in the visuals, the report only includes the definitively identified brand and product family name of the device.

Areas of Use

This device is a fundamental component of EEG devices used in Neurology and Sleep Laboratories. It is suitable for use in the following areas:

• Recording brain activities (EEG) of patients.
• Placement and connection of electrodes to the patient according to the standard 10-20 system.
• Collection of additional physiological signals during sleep studies (Polysomnography).
• Neurological monitoring in intensive care or clinical settings.

Package Contents and Quantity Information

A total of 3 main parts/groups have been identified in the visuals:

1. 1 Unit – Nihon Kohden Neurofax Electrode Junction Box (Main Unit and integrated cable).
2. 1 Pack – EEG electrode/lead set consisting of colored cables (multiple cables within the pack).
3. 1 Unit – Black-colored mounting bracket with a metal handle (for securing the device to a stand or bed).

General Condition and Cosmetic Examination

The general condition of the device has been assessed as “Clean Used / Second Hand”.

• Casing: The white plastic casing generally appears clean. It has retained its color, and no significant yellowing (UV damage) has been observed.
• Writings: The diagrams, numbers, and warning texts on the front panel are not erased, and are quite clear and legible.
• Physical Deformation: No cracks, breaks, deep scratches, or dents have been detected on the casing. The edges and corners appear robust.

Technical Interface and Input Ports

The front and side panels of the device feature numerous input/output units. According to visual analysis, the connection points are as follows:

• Electrode Inputs: On the front face, there are numbered electrode input sockets arranged according to the standard “10-20” system (Fp1, Fp2, C3, C4, T3, T4, etc.).
• Sensor Inputs: In the upper right corner, there are extra sensor inputs from X1 to X7 (including RESP F, RESP C, RESP A).
• Special Inputs: At the bottom, “SpO2/CO2” and “DC1/DC2” labeled connector inputs are visible. On the side panel, “DC 3”, “DC 4”, “DC 5”, “DC 6”, and “MARKER” inputs are located.
• Control Panel: On the left side, there is an “IMPEDANCE CHECK” button and “SELECTOR (kΩ)” indicator LEDs (2, 5, 10, 20, 50).

Condition of Cables and Accessories

• Main Data Cable: The thick gray cable connected to the device appears intact. No tears or crushing have been detected on the outer surface of the cable. The connector at the cable end (white, multi-pin structure) appears physically sound. A blue hook-and-loop strap is present on the cable for fastening.
• Electrode Set: The colored cables inside the transparent bag (estimated to be DIN type electrode tips) are bundled and tangled. Although the package has been opened, the insulation of the cables is visually in good condition.
• Mounting Bracket: The metal shaft of the black bracket may show slight signs of use, but no rust or functional damage is observed. Its screw mechanism is present in the visual.

Electronic and Mechanical Component Analysis

As a result of the visual inspection, no signs of mechanical malfunction are observed. The “Impedance Check” button is in place and robust. As the device is not a passive unit but contains electronic circuits, the functionality of its LED indicators and ports can only be determined by testing. However, no bending or corrosion has been noticed on the internal pins of the ports (as far as visible).

Potential Failure Risk and Warnings

The device appears to be in very good condition externally and gives the impression of being ready for immediate use. The absence of serious rust or broken parts is positive. Only the following points should be considered:

• The electrode cables within the package are consumables and should be checked for hygiene and conductivity.
• Although there is no visible damage to the frequently bent base sections of the main connection cable, there is always a risk of internal conductivity issues due to its service life; however, no deformation indicating this is visible in the visuals.

Documents and Year of Manufacture

The visuals do not include an invoice, warranty certificate, or user manual for the product. Since there is no visible label on the device indicating the year of manufacture, the exact year of manufacture could not be determined.