R.V.R. Elettronica PJ300M, User Manual

Page: 28 / 34

PJ300M
22 / 28 User Manual Rev. 7.0 - 25/07/03
9.2 Ordinary Maintenance
The only regular maintenance needed by the PJ300M, is the periodic substitution of
the blowers, and the cleaning of dust filters (if installed) and any dust accumulated
inside the amplifier.
The time between overhauling of the blowers depends upon the environmental factors
like temperature, humidity, dust pollution etc. It’s advisable to check the unit every 6
months, and to substitute noisy blowers.
Blowers should be changed as a matter of course at least every 18 months.
9.3 Substitution of modules
ATTENTION: When the amplifier is operated with the cover removed, hazardous
voltages and heavy current are accessible. Make shure that all primary power is
disconnected from the amplifier before performing any maintenance of the device.
To reinstall a module, just execute the operations described in the following in the
opposite sequence.
Remove all the screws that are located on the top cover of the machine. After the
cover has been removed, it is possible to extract and replace the modules, that you
may identify with the help of chapter 9.1.
These operations must be done only by specialized technicians, equipped with
appropriate tools. Wrong operations can cause serious damages to the machine
and and will void your warranty.
9.3.1 Power Supply Replacement
• With the help of the wiring diagram shown in appendix, take the note of the cables
connected to J1, J2, J3, J4 and J5 of the low pass filter and disconnect them.
• Unscrew the two screws securing the low pass filter to the rear panel.
• Carefully remove the low pass filter.
• Take note of the wiring of JP2, JP3 and JP4 power supply's connectors and
disconnect them.
• Unscrew the screws securing the power supply to the hex standoffs.
• Carefully remove the power supply.
9.3.2 Low Pass Filter Replacement
Proceed as described in the first three steps of the previous paragraph.
9.3.3 R.F. Power Amplifier Module Replacement
• With the help of the wiring diagram shown in Appendix, take the note of the cable
position.