TEX100
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User Manual
Rev. 4.0 - 18/07/03
8.2
Removal of the Modules
NOTE: When the exciter is operated with the cover removed, hazardous voltages
and heavy current are accessible. Ensure all primary power is disconnected from the
exciter before attempting equipment maintenance.
To reinstall the card is enough to execute operations sequence in the opposite way.
Remove all the screws that are located on the top and bottom covers of the machine.
After that the covers have been removed, extract, with the help of the upper and
bottom view, all exciter modules.
8.2.1
Stereo encoder card replacement
•
Open the top and bottom covers of the unit.
•
Disconnect connectors J1, J3 and J4.
•
Unscrew the four nuts fixing the card on internal chassis.
•
Unscrew the screw inside the INPUT LEVEL knob and slide it off.
•
Raise the card from its supports, simultaneously sliding the switches and the
INPUT L\EVEL switch pivot from the panel.
8.2.2
RF power amplifier replacement
The power amplifier module is constituted from a preassembled block in which are
integrated circuits, the power devices and the cooling fin.
In order to remove this module, identify with the help of the wiring diagrams the various
cables connects to the module. Remove the power supply cable from the final stage
module and unsolder other cables. To disconnect the cable of RF input.
At this point, remove the screws that fix the amplifier module block to the rear of the
machine and the nuts that fixes it to the bottom and remove the module.
8.2.3
RF power amplifier transistor replacement
For this module it's only possible to replacement the transistors:
•
Open the top cover of the unit.
•
Unscrew the two fixing screws of the device (BGY33, MRF317 or SD1480).
•
Remove the broken transistor.
NOTE: During replacement of broken devices it's necessary to pay attention to
device's pin position and insertion, to check that the device's fixing screws aren't in
short-circuit and to check that the soldering is good and without impurities.
NOTE: Interpose between devices and heat-sink an electronic silicone compound.
Summary of Contents for TEX100
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