CS-990 GB
7
G. BATTERY CHECK
Battery check Button G is provided as a guide to the battery’s condition. To check the battery
condition, switch on the detector by turning the On/Off switch in a clockwise direction whilst
simultaneously pressing the auto-tune button, once the detector is tuned, release the Auto-Tune
button and then press button G situated under the meter. If the needle on the meter swings into the
bold red sector the batteries are in good condition. Should the needle not reach this sector of the
meter and remain, the batteries will need to be renewed. The use of headphones is recommended as
these not only offer longer battery life but also ensure that the user will hear the slightest signal
change, which could indicate a valuable find which otherwise could be missed.
H. BATTERY COMPARTMENTS
There are two battery compartments on the 990 and these are situated on the left and right hand
sides of the detector control box and are covered by easily-opened covers.
I, J, & K. STEMS
These are assembled by fitting the upper stem to the main body of the detector in the aperture
provided and by inserting the middle and lower stem into one another. A knurled nut containing a
plastic olive effects the tightening. It is recommended that the knurled nut is removed from the base
of the stem, placed over the thinner of the stems of any two being connected together before sliding
this stem into the thicker one. The knurled nut can then be offered up to the thread on the thicker
stem and tightened.
L. SEARCH HEAD
The concentric coil arrangement of the search head is designed to transmit and receive a magnetic
field and detect the changes that occur when metal is present. Because the receive coil is in the
centre and the transmit coil around the perimeter, the hot-spot or pinpointing area is in the exact
centre of the search head.
The metal detector’s search heads are fully waterproof and can therefore be immersed in rivers,
rockpools etc. up to the lowest knurled nut. After use, particularly in salt water, it is advisable to
wash off the search head and the lower stem into fresh water, carefully wiping it dry with a soft
cloth. It must be remembered that the search head is very sensitive to temperature changes. It is
therefore important to allow the detector to reach the temperature of the surroundings in which it
will be used. For example, if you take the detector from a hot car on a cold day, the detector signal
will drift and be unstable until the head has absorbed the temperature change.
