T.E.M. A07B500S Manual - page 43
A07B500S manual
Pag. 43
The PWN and PW500 modules supply power to the entire device.Adjustment can be made
only by authorized people as the cards contain dangerous voltage levels; there are ground planes of
various voltages and connected directly to the mains supply. It is thus dangerous to even connect
using an insufficiently insulated measuring instrument. If failure occurs, attempting to fix the
card is not recommended. Once the F3-F2 (15A), F1 (2A) fuses have been checked, if the cause of
failure is still unresolved, send the transmitter back to the factory or at least substitute all of the
power source modules found on the right side of the transmitter. To access the modules, remove
the right side panel of the transmitter, which requires the device to be shut off prior to accessing the
modules.
Through the RT1 (PWN board) trimmer, it is possible to regulate power source voltage to the final
MOS-FETs (44Vdc on pin 2 of J1).
The RT1 trimmer (PW500 board) regulates the 15Vdc voltage (pin 4 of J1), while the negative
voltage is constant at –12V.
The RT3 trimmer (PW500X board) regulates measurement of radiator temperature of the power
amplifier circuits.
The RT2 trimmer (PW500X board) regulates measurement of current supplied from the power
source on 48Vdc of voltage.
6.2 A15 Module - RF driver
Module A15 represents the final amplifier driver; it has an input power of 10 mW and an
output power of 15 Watts if the power source at all stages is 15Vdc.
Without an input signal, adjustment of RT1 trimmer is necessary for a drained current of 300mA at
the second stage. RT2 trimmer must be adjusted to reach a final drained current of 200mA.
Adaptation circuits are completely broad band and require no adjustment.