Chapter 4 - Troubleshooting Guide - Garnet MULTIRACK 688-S Manual

CHAPTER 4 - TROUBLESHOOTING GUIDE

Overview
There are only 4 serviceable components to the system: the 688M
module, the interconnecting fiber optic cable, the controller,
and the third party rack sockets and wiring. Make sure that
the compartment is in fact empty and that the S L L
, or
EE EVE
TM
S L LS
gauges are working correctly. To test the various
EE EVE PECIAL
TM
components, substitute a known good component to see if the
rest of the system is working.
Driver Module
The battery in the 688M module should last for 10 years, and is
not user serviceable. If the controller is non-permissive, check the
light output from the module, it should flash about 4 times per
second if the gauge is telling it to. If it is not flashing, connect
the two wires from the 688M module together, this should make
it flash. If not, the module is defective. If it does flash, the gauge
alarm point 4 is not working, it may need to be programmed or
serviced.
Fiber Cable
If the module produces a light pulse but it does not reach the
controller, replace the fiber cable.
Controller
If the controller is non-permissive, check to make sure it is receiving
light pulses from the fiber(s). Dual controllers need pulses from
both fibers to permit. If the optic or thermistor diagnostic LEDs
are on, but the permit light is off when the controller is receiving
light pulses, replace the controller.
If the controller diagnostic LEDs are not on, check for voltage
(using a voltmeter) at the optic red wire or green thermistor wire.
If the controller is getting power and ground, but does not light,
replace it.
If the controller shows permit but does not allow loading, check
the wiring around the controller. If the controller does not pass
the optic pulse, or if it is getting thermistor power but does not
produce a pulse, replace the controller.
Page 10 688 Manual