Motorola MotoTRBO XPR8400 Repeater

Intro

The Motorola MotoTRBO XPR8400 repeater consists of:

On the board that the fan is plugged into there is a switch that will change from full time High Speed Fan operation to temperature based, this makes the repeater much much much quieter!
This radio uses a PWM Fan that the controller senses the fan speed and can speed up/slow it down, theoretically there is a way to swap this with a Noctua PC Fan (120MMx120MM) you'll have to do some changes to the wiring to make this work. I am trying to figure out how to do this and it will be updated soon.

No Transmit (or low low low power level) - This is common and happens due to someone running the radio at max power in continuous duty, a common trick is to swap the TX & RX Radio bricks. Keep in mind that you will have the smaller heatsink on your TX radio and adjust power accordingly

You will need a PMKN4167A DC Power cable to DC Power this, Please also note you'll need to adjust the DC TX Power in the general section of the CPS settings screen. If you buy this cable on eBay keep in mind that a lot of cables you will see there are Chinese knockoffs.
The Radio can trickle charge the attached battery however it is much better for the battery to run an external BMS (West Mountain Radio ones work well, as do the Duracomm RMBC)

The Motorola MotoTRBO XPR8400 Repeater is capable of being monitored by the motorola RDAC tool, if you are using the radio with Brandmeister you will need to use local mode with the USB Cable

Accessory Cable Pinout 1 Accessory Cable Pinout 2

Programming Cable