4
MAINTENANCE
Safety infonnation
Disconnect the electrical supply from the AUTO 306 before you start maintenance work.
Do not touch surfaces within the AUTO 306 which are very hot or very cold.
Take suitable precautions when using solvents and cleaning agents.
4.2
Removal of deposits from the crystal
1. Carefully remove the crystal from the crystal head as described in Section 3.6.
2. Gently swab the area of the deposited layer with a cotton bud soaked in a suitable solvent.
If the crystal was prepared as described in Section 3.8, use a 5% sodium hydroxide solution
at 20 °c to dissolve the aluminium coating on the crystal.
3. Rinse thoroughly in water and allow to dry.
4. Vapour degrease or wash the crystal in propanol.
5. Check the crystal and the crystal electrical contacts for signs of damage (see Section 4.3); if
they are not damaged, prepare the crystal as described in Section 3.6.
Crystal electrical contacts
The crystal is electrically connected to the crystal head by two gold cracks on the crystal. The
crack on the front of the crystal makes contact with the enclosure (see Figure 6, item 3). The track
on the rear of the crystal makes contact with the sprung fingers inside the crystal head (see
Figure 4, item 1).
Clean the gold tracks on the crystal, the inside of the crystal head and the sprung fingers using
a cotton bud soaked in a suitable solvent (such as propanol).
Carefully check the gold tracks and the sprung fingers for signs of damage which may result in
inadequate contact for the effective electrical signal transfer from the crystal head to the
Oscillator Unit.
Water Cooled Crystal Holder
15
To Next Page
Loading...
Need help?
General
