Nihon Kohden ZM-521PA/520PA Telemetry Transmitters as is not working

NIHON KOHDEN ZM-921PA TELEMETRY TRANSMITTER with leads

GE Dinamap Pro 300v2 DP310N Vital Signs Patient Monitor

Nihon Kohden ZM-520PA Telemetry Transmitter

Nihon Kohden Canvys PC240362R Touch Screen Monitor

Philips IntelliVue MP2 Portable Patient Monitor

Philips IntelliVue Intelli Vue X2 Vital Sign Patient Monitor M3002A Rev H

Nihon Kohden p6b ZM-920PA Telemetry Transmitter ECG HOLTER