Loma IQ2 Service Manual page 81

F2 -
F3 -
Before replacing the fuses it is recommended to check the circuitry connected to
the reject relay to ascertain the reason for the fuse blowing.
Access to the fuses can be gained as follows:
1. Using the 5mm allen key supplied with your equipment, unscrew the 2 front
hinged door screws on the control box and open the door.
2. Undo and remove the 4 M3 pillars or nuts securing the PSU safety mesh screen
cover and carefully remove. The cover is connected via a ground wire to the
control box; there is no requirement to remove this connection. The wire is of
sufficient length to allow the placing of the cover in the bottom of the hinge door.
3. The fuses are located on either side of the reject relay.
4. Once replaced assembly is the reverse of the above.
+/-12v DC Rail Protection Fuses
Early issue control & psu boards are fitted with a replaceable soldered fuse link
located in positions R337 (+12) & R338 (-12)
either rail is due to an open circuit fuse then it is possible to replace these items.
If it is desired to attempt a replacement then the later re-settable fuse type
should be used. Loma part number 517104.
Later issue control & psu boards are fitted with the re-settable fuse as standard
located as above. In the event of a loss of either rail the main power to the
detector should be turned off for a minimum period of 10 seconds to allow the
fuses to reset.
Before attempting to replace the non re-settable types please observe the
WARNINGS at the start of this section. Removal of the control & psu board is
required in order to unsolder the fuse/s to be replaced see
removal and replacement
Replacement or resetting of these fuses may not result in the restoration of the
DC rail.
Module 8023
T5A Loma part number 517026
T5A Loma part number 517026
on page 7
Figure 2
.
Maintenance
if the loss of
on page 6
control & psu
6-11