The SOLT SB6-2XWH-F (KT reference KTI040120SLTB62X) is a low-power, 400 MHz FSK wireless call transmitter equipped with a 1.4 m tethered foot-step button switch and an integrated separate cancel button. System faults typically stem from RF signal path attenuation, mechanical wear of the tethered cable, or depleted internal coin cells. Follow these technical procedures to resolve field issues rapidly.
No RF Signal Received at Central Nurse Station Display or Mobile Pagers
When the foot-step switch or transmitter faceplate button is pressed, the unit should initiate a 400 MHz FSK wireless transmission to compatible SOLT receiving devices, such as SM3-32PN, SM3-33PC, or SM3-61PC main display panels, or SP5, SP7, and SP9 series mobile alphanumeric pagers.
- Check Visual Confirmation: Observe the high-brightness LED indicator located on the snow white faceplate of the 100 mm x 60 mm transmitter housing. If the high-brightness LED does not illuminate when pressing either the foot switch or the cancel button, power delivery is interrupted.
- Receiver Registration: If the LED illuminates brightly but the main receiver panel or SR5-MPR PC monitoring interface does not register the alert, verify that the transmitter ID is correctly paired into the receiver memory. Re-register the wireless call bell according to your specific receiver model protocol.
- Cancel Function Isolation: Verify whether the separate cancel button on the main housing operates correctly. If the cancel transmission successfully clears active calls on the display panel or corridor door light (SL series) while the remote foot pedal fails to alert, the issue is isolated to the external 1.4 m cable or foot-step contact.
Fading or Inactive LED Indicator and Battery Replacement
The internal circuitry is powered by two CR2032 coin cell batteries (they are not included), designed to provide an operating lifespan of 1 to 3 years under typical clinical calling cycles. Degraded signal performance or a weak visual indicator indicates voltage depletion.
- Depleted Cells: A dimming or unresponsive high-brightness LED confirms that the power cells have fallen below the operating threshold required for 400 MHz FSK transmission.
- Cell Replacement: Open the slim 16.5 mm profile chassis and replace the power source with fresh CR2032 coin cell batteries (they are not included). Ensure correct polarity seating within the battery carrier before snapping the enclosure closed.
- Contact Inspection: Inspect the internal battery clips for surface oxidation or terminal misalignment to maintain reliable electrical contact under constant hospital operation.
Foot-Step Switch Unresponsiveness and Tethered Cable Inspection
In operating suites (OT/OR) and patient washrooms, the 1.4 m foot-switch assembly is positioned on the floor surface, exposing it to mechanical impact and strain.
- Physical Cable Assessment: Inspect the full 1.4 m length of the tethered cord. Check for severe crushing, sharp pinches, or jacket tearing caused by surgical trolley casters, hospital bed frames, or heavy foot traffic.
- Actuator Mechanism: Check the foot-step switch housing for trapped particulate or chemical residue buildup that could mechanically impede the internal contact closure. Press the pedal firmly to confirm a positive tactile switch transition.
RF Range Limitations in Reinforced Concrete Facilities
The SB6-2XWH-F integrates an internal helical PCB antenna delivering 360-degree omnidirectional radiation. However, heavy reinforced concrete walls, lead-lined surgical suites, and dense partition layouts can cause RF shielding on the 400 MHz band.
- Signal Reach Extension: If transmission confirmation occurs locally via the high-brightness LED but alerts intermittently drop before reaching the receiver console, structural attenuation is present.
- Repeater Deployment: Integrate SOLT SR5-BPR wireless signal repeaters between the patient call point and the nurse station display to bridge signal distances and eliminate structural RF dead spots.
System Diagnostic and Fault Resolution Matrix
| Observed Condition | Probable Cause | Corrective Procedure |
|---|---|---|
| LED does not illuminate upon pressing foot switch or cancel button | Depleted CR2032 coin cell batteries (they are not included) or dislodged cell terminals | Open 16.5 mm chassis, seat fresh CR2032 coin cell batteries (they are not included), and check terminal tension. |
| Cancel button triggers receiver, but foot-step pedal does not | Damaged 1.4 m cord, broken conductor, or mechanical obstruction in pedal switch | Inspect the 1.4 m cable for physical pinches; clear external pedal debris; test switch contact continuity. |
| LED illuminates, but alerts do not appear on displays or pagers | Transmitter ID unassigned, or RF attenuation across hospital architecture | Re-register call point into SM3 display/SP pagers; install an SR5-BPR repeater to extend 400 MHz transmission reach. |
| Intermittent transmission in wet areas or washrooms | Surface contamination or mounting displacement on floor/wall junction | Verify secure wall positioning of the 46 g transmitter enclosure and clear debris surrounding the floor step-button. |
