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Nihon Kohden BSM-6301 / BSM-6501 / BSM-6701 Bedside Monitor Service Manual
Manufacturer Recommendation / AEM Status
The manual lists maintenance and safety-related activities for the Nihon Kohden BSM-6000 Series bedside monitor. Manufacturer-listed items include regular maintenance inspection, patient safety checks, diagnostic check screen review, manual check screen access and function checks, alarm indicator check, leakage current testing, and temperature accuracy and disconnect checks.
Manufacturer-listed PM items include:
- Regular maintenance inspection at least every 6 months.
- Patient safety checks before first installation, periodically after installation, and after any repair.
- Diagnostic check screen review.
- Manual check screen access and function checks.
- Alarm indicator check.
- Safety check / leakage current testing.
- Temperature accuracy check.
- Temperature connector-off detection check.
- Temperature sensor-off detection check.
The service manual states that patient safety checks include protective earth resistance check, earth leakage current check, enclosure leakage current check, patient leakage current check, and withstanding voltage check.
The safety check section also states that four currents are measured with components connected: grounding leak current, exterior leak current, patient leak current, and patient measurement current, in both normal state and single-failure state. Measured values must be recorded.
Manufacturer-listed frequency:
- Regular maintenance inspection: At least every 6 months.
- Patient safety checks: Before first installation, periodically after installation, and after any repair.
- Temperature check frequency: Not specified in the provided manual.
- Battery replacement interval: Not specified in the provided manual.
- Filter replacement interval: Not applicable / not listed in the provided manual.
Manufacturer-listed tools and equipment include LCC-1101 leak current checker, AX-400G vital sign simulator, AX-800P connection cable for TEMP socket testing, BSS cable for AX-400G for MP socket testing, and electrical safety analyzer / protective earth tester as needed to complete the protective earth resistance check listed by the manual or facility procedure.
If a facility performs this PM at a different interval or changes the listed activities, that should be handled under the facility’s approved AEM program, risk assessment, maintenance history, and applicable regulatory requirements.
What This PM Procedure Covers
- Visual and operational inspection.
- Diagnostic / manual check screen review.
- Alarm indicator check.
- Electrical safety / leakage current documentation.
- Temperature accuracy and temperature disconnect checks.
- Final return-to-service decision.
Required Tools and Equipment
- LCC-1101 leak current checker or facility-approved electrical safety analyzer capable of required leakage tests.
- Protective earth / ground resistance tester if not included in the analyzer.
- AX-400G vital sign simulator.
- AX-800P connection cable for TEMP socket, if checking TEMP socket.
- BSS cable for AX-400G, if checking MP socket.
- Standard cleaning supplies approved by facility policy.
- CMMS work order or PM checklist.
Step-by-Step PM Procedure
1. Confirm Device Identity and Condition
Verify the monitor is a Nihon Kohden BSM-6000 Series bedside monitor. Confirm model, serial number, asset tag, location, and installed options.
Expected outcome: Device identity matches the CMMS record.
2. Remove From Patient Use
Confirm the monitor is not connected to a patient. Remove patient cables, sensors, cuffs, and applied parts before PM unless needed for a controlled test.
Expected outcome: PM is performed off-patient.
3. Visual Inspection
Inspect the monitor housing, display, touchscreen, controls, AC power cord, equipotential terminal, battery condition, connectors, modules, recorder if installed, network ports, and accessory sockets.
Expected outcome: No cracked housing, damaged power cord, loose connectors, missing labels, exposed conductors, liquid intrusion, or unsafe accessory condition.
Remove from service if physical damage, liquid ingress, damaged power cord, failed grounding, failed leakage test, failed alarm indicator, failed temperature check, or any fault that may affect safe monitoring is found.
4. Power-On Check
Power the monitor on using AC power. Observe startup behavior and confirm the monitor boots normally without unresolved technical alarms or fault messages.
Expected outcome: Monitor powers on normally and reaches normal operating display.
5. Access Diagnostic Check Screen
Turn monitor power off. Press the Power switch while pressing the Silence Alarms key until the DIAGNOSTIC CHECK screen appears.
Expected outcome: Diagnostic check screen opens.
Note: The manual states this screen can be used to view error history or perform manual check, system setup, or initialization. Do not change settings during PM unless specifically required by facility procedure.
6. Access Manual Check Screen
From the Diagnostic Check screen, select MANUAL CHECK, enter the password, and open the Manual Check screen.
Expected outcome: Manual Check screen opens.
Manual-listed check areas include CPU checks, graphic checks, DPU checks, communication checks, EPU check, alarm indicator, backlight, hard keys, touch keys, sound, SD card, board info, NIBP, multi parameter, recorder, USB, multi link, serial, and ECG depending on configuration.
7. Alarm Indicator Check
Open the ALARM INDICATOR check from the Manual Check screen. Check that the top alarm indicator lamp lights according to the displayed screen indication. Use AUTO or manually check the listed colors.
Expected outcome: Alarm indicator lights correctly for each indicated color.
Fail condition: If a color does not light, lights partially, or does not match the screen indication, remove from service for repair.
8. Temperature Accuracy Check
Connect the AX-400G vital sign simulator to the monitor temperature input.
Use the appropriate cable: TEMP socket with AX-800P compatible cable, or MP socket with BSS cable for AX-400G.
Set the AX-400G output and confirm the monitor indication is within the manual-listed range:
- 25°C setting: Expected monitor indication 24.8 to 25.2°C.
- 37°C setting: Expected monitor indication 36.8 to 37.2°C.
- 44°C setting: Expected monitor indication 43.8 to 44.2°C.
Expected outcome: Displayed temperature is within the listed range at each test point.
9. Temperature Connector-Off Detection
During temperature signal input from the AX-400G, disconnect the temperature connection cord from the MULTI socket.
Expected outcome: Monitor displays CONNECTOR OFF.
10. Temperature Sensor-Off Detection
During temperature signal input from the AX-400G, remove the temperature cable plug from the TEMP socket.
Expected outcome: Monitor displays CHECK SENSOR.
11. Restore Settings
After temperature testing, return any changed temperature settings to the facility’s normal configuration.
Expected outcome: Monitor settings are restored before return to service.
Electrical Safety Testing
The manual lists patient safety checks and leakage current testing. It specifically lists leakage current measurements using the LCC-1101 leak current checker and states measured values must be recorded.
Protective Earth / Ground Resistance
The manual lists a protective earth resistance check as part of patient safety checks but the provided safety check section does not give a specific resistance limit.
Ground resistance measured in ohms, expected ≤ 0.5 Ω or facility/NFPA 99 criteria if different.
Grounding Leak Current
Manual-listed limits:
- Normal state: 500 µA or less.
- Single-fault state: 1 mA or less.
Grounding leak current measured in microamps:
Facility limit used =
Result =
Pass / Fail =
Exterior / Enclosure Leak Current
Manual-listed limits:
- Normal state: 100 µA or less.
- Single-fault state: 500 µA or less.
Touch/chassis leakage measured in microamps:
Facility limit used =
Result =
Pass / Fail =
Patient Leak Current
Manual-listed limits:
- Normal state: 10 µA or less.
- Single-fault state: 50 µA or less.
Patient leak current measured in microamps:
Facility limit used =
Result =
Pass / Fail =
Patient Measurement Current
Manual-listed limits:
- Normal state: 10 µA or less.
- Single-fault state: 50 µA or less.
Patient measurement current measured in microamps:
Facility limit used =
Result =
Pass / Fail =
Pass / Fail Criteria
Pass
PM passes if visual inspection passes, the monitor powers on normally, diagnostic / manual check access is successful, the alarm indicator functions correctly, electrical safety checks pass using manual-listed or facility-approved limits, temperature accuracy is within listed ranges, connector-off and sensor-off detection messages appear correctly, and no unresolved technical alarms or unsafe conditions remain.
Remove From Service
Remove from service if physical damage, liquid intrusion, damaged power cord, failed grounding, failed leakage current, failed alarm indicator, failed temperature accuracy, failed disconnect detection, or unresolved fault is found. Remove from service if the monitor cannot complete required checks or cannot be verified safe for patient use.
Copy/Paste CMMS Work Order Procedure
Use the manufacturer service manual, facility policy, and approved AEM program to determine the final PM interval and return-to-service requirements.