
Security Escort
Troubleshooting transponders, points, receivers, and alert units | en
103
Robert Bosch (SEA) Pte Ltd
Training Manual
2017.08 | V2.18.1.0 | DOC
Symptoms
Probable Cause
Possible Solutions
Bus failure.
Bus power jumper not in
place.
Place jumper on for
corresponding bus (see the
transponder’s Installation
Instructions for location of
jumper).
Short or open on the bus
wires.
Put meter across bus wire.
Should be reading between
7.5 V DC to 10.5 V DC. If
voltage is not present or
lower than 9 V, check wiring
(BUS+ to BUS-) for possible
ground, short, or open.
No power to receiver.
Check power for 10.5 V DC to
13.5 V DC. If lower than 10 V
DC or no voltage present,
check wiring (PWR+ to PWR-)
on power side of receiver,
repair, or replace cable.
Close lightning hit.
Power down transponder (AC
and battery) for 30-sec., then
turn power back on. If bus
failure does not clear,
probable cause would be bad
bus on transponder.
Bad bus on transponder.
Remove cable from bus,
meter terminals with VOM. If
voltage is lower then 9 V DC
on BUS+ or lower then 12 V
DC on PWR+, replace
transponder.
Tab. 7.7:
EA500 transponder bus faults
7.3.5
EA102 receiver issues