Print Date 08/04/14 Page 20 of 34 S79005-00MA-05
2.3 SETTING UP PROCEDURES
2.3.1 Fuses
If any problems occur after the Transmitter has been installed and switched on, fuses may need to be
checked and possibly replaced. However, a blown or open-circuit resettable fuse would generally
indicate the presence of a fault, which would need correcting.
The type, function and access to fuses is as follows :
Type
Function
Access
500mA (F) Fuses
(for smd holders,
‘Littelfuse’
R451.500)
One per E2021.
For protection of control circuits
within E2021 Amplifier modules.
If fuse blows, all front panel
displays on just the affected E2021
go out and its power level falls.
Remove Amplifier module from front,
taking care to release the mechanical
securing locks first. Smd fuseholder is at
rear of unit under the screen cover.
500mA (F) Fuse
(for smd holders,
‘Littelfuse’
R451.500)
One only.
For protection of control circuits
within the E2026 Drive Changeover
/Output Monitor Unit
If fuse blows, all front panel
displays on just the E2026 go out
(except
DRIVE
A/B
and
INTERLOCK/EXT MUTE) and the
overall output power level falls to
zero.
Note, if a spare fuse is not
available, one may be transferred
from one of the E2021 modules to
enable operation at lower power.
Slide Drive Changeover/Output Monitor
Unit forwards after removing front fixing
screws and all rear connections.
Remove the top cover.
Smd fuseholder is accessible on the
front printed circuit board, right hand
side.
! CAUTION ! Ensure that the front
panel
Supply
Disconnector
is
switched to ‘OFF’.
16A (T) HBC
5x32mm
(¼ x1¼ in) Fuses
One per E2021.
For protection of internal dc supply
leads to and high current circuitry
within E2021 Amplifier modules.
If fuse blows, all front panel
displays on just the affected E2021
go out and its power level falls to
zero.
At the bottom rear of the Transmitter,
the larger fuse-holders on the left/right
hand sides. Note fuse position mirrors
amplifier position, FS1/2.
! CAUTION ! these are high energy
circuits and thus care must be taken
if replacing the fuse with power on.
6.3A (T) HBC
5x20mm Fuses
Two only.
For protection of internal low
current dc supply leads.
Internal low current supplies are
dual redundant, thus the loss of one
fuse produces no failure (only
E2023 display warning). If both
blow, E2023 and E2026 front panel
displays all go out and the overall
output power level falls.
At the bottom rear of the Transmitter,
the single smaller fuseholders on the left
and right hand sides, FS3/4.
! CAUTION ! these are high energy
circuits and thus care must be taken
if replacing the fuse with power on.
6.3A (T) HBC
5x20mm Fuses
Two only or
one only (FS5) on
–07 and –08
variants
For protection of mains supply
leads and circuitry intended for
connection to Exciter/Drive(s).
At the bottom rear of the Transmitter,
the smaller fuseholders adjacent to the
associated mains output sockets. FS5/6
! CAUTION ! these are high energy
circuits and thus care must be taken
if replacing the fuse with power on.
