5-14 888-2629-200 10/6/10
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
Maxiva ULX COFDM Series
STEP 8 Install a new heat transfer pad (411-0126-000).
STEP 9 Install PS hold down screws.
STEP 10 Reconnect supply wire to WAGO.
STEP 11 Replace PA module cover.
STEP 12 Replace PA module in rack. Tighten module hold down screws.
STEP 13 Turn on PA module breaker.
5.7.2 AC/DC Converter (PS) Board Output Voltage
The output of the PS board (also referred to as the AC/ DC converter board) changes
depending on transmitter modulation type. To operate properly the output of the PS
board must be initially adjusted to 48V. This adjustment is made in the factory on each
board prior to installation into a module or shipment as a replacement part. The output
voltage can also be set in the field if a module test system is available. The optional PA
module test system part number is 971-0040-080.
5.7.2.1 Setting Voltage:
STEP 1 Follow the PS board replacement steps outlined in Section 5.7.1 on page
5-13 stopping at step 10.
STEP 2 Place the module in the module test fixture.
STEP 3 Remove JP1
STEP 4 Activate the module and set Vout to 48V using the trim pot shown in
Figure 5-6 on page 5-13.
STEP 5 Replace JP1.
STEP 6 Complete steps 10 -13 in Section 5.7.1 on page 5-13.
The TCU sends a Vtrim voltage to the PS boards. The Vtrim voltage varies depending
on the transmitter modulation selection. The PS output varies depending on the Vtrim
signal received from the TCU. The Vtrim levels are given below.
Vtrim Levels:
• 5.755V ---- 44V
• 4.122 V --- 46V
• 2.490V ---- 48V
To Next Page
Loading...
Need help?
General
