Dual Frequency Detectors - Loma IQ2 Service Manual

DUAL FREQUENCY DETECTORS

A dual frequency detector is capable of operating at two different frequencies
that are selectable from within the Product setup menu Frequency menu
position. Selection is on a per memory basis giving the flexibility to change
operating frequency upon a change of product. Selection is simply HIGH or
LOW.
Having the ability to work with two different frequencies enable a much wider
mix of product type, packaging & operating mode to be accommodated by a
single detector.
Located behind the removable end plate of your detector search head case are
a modified search headboard and a dual receiver interface board.
There are no user replaceable components located on either board. Should the
boards develop a fault they will require replacing. Contact your local Group
Service Centre for help.
As with a single frequency detector the receiver board contains a pair of user
adjustable ferrite cores one for each operating frequency that can be used to
adjust the balance signal when the detector is in its quiescent state.
Removing the screwed metal bungs located on the removable end plate on the
search head case accesses the ferrite cores. Instructions as to its use are in the
"Functional Testing" section of this manual.
A simplified diagram showing the ferrite core position follows:
Module 8023
Maintenance
6-21