7
FAULT FINDING
If the amplifier does not work correctly, consult the following table before contacting
either the helpline or your distributor for further assistance.
Fault experienced
Possible cause
No cooling air flow
Mains connector not connected
Mains supply not present at amplifier input -
check all external trips, fuses, breakers and
cabling
Fans operate but amplifier fails to
respond to user port control inputs
User port connector not connected
External control system fault
Control cable damaged/severed
No RF output, exhaust air is cool
Transmit mode not selected
No RF output, exhaust air is warm
No or low RF input
Damaged/severed external RF cable
Internal gain adjust is set to minimum (only
on units fitted with DEVA option)
RF Inhibit facility active. Check external RF
inhibit circuitry. If external RF inhibit circuit
is not used, check user interface connector
mating half has a link between pins H and P
(see section 5.2)
BASEPLATE OVER
TEMPERATURE condition
Inadequate cooling for the amplifier (see
section 3.3)
Obstruction within the cooling airflow sys-
tem
The lower lid is removed or incorrectly fitted
External ducting is too long or restrictive
(see section 3.3)
T W T
O V E R
T E M P E R A T U R E
condition
Inadequate cooling for the amplifier (see
section 3.3)
Obstruction within the cooling airflow
system
The lower lid is removed or incorrectly fitted
External ducting is too long or restrictive
(see section 3.3)
COOLING FAN 2 fault
Contact your distributor.
COOLING FAN 1 fault
Contact your distributor
HEATER FAULT fault
Contact your distributor
HBN63xx-1, Issue 8, Page 41
