User Guide

PAMS
Technical Documentation
NME–3
Troubleshooting
Page 4
Issue 1 10/99
Radiounit failures
This chapter describes how to find failures in the Radiounit:
Radiounit doesn’t Powerup
Connect the Radiounit to +12V while ignition sense is switched off and
look to see if the Leds are turned ON for a short time
– If they don’t turn on at all,
– check the current consumtion, if it is about 300– 400uA the wakeup
logic should be checked, if it is much less or more there is a Problem
in the powersupply
– Check the status of all voltages
– Check the status of the wakeup logic
– If the Leds stay on,
– Check the digital part
– Check powerdown logic
– If the LEDs go off as specifed and current is O.K.:
– Try to wakeup the radiounit by turning Ignition sense ON,
– if the Leds stay on go to the next step
– if they don’t stay on or don’t turn on at all check the Ignition circuit
– Try to wakeup the radiounit by pressing the powerbutton of the HS,
– if the Leds stay on go on, try flashing the unit
– if they don’t stay on or don’t turn on at all check the Powerbutton cir-
cuit