4-14 888-2629-200 10/6/10
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
Maxiva ULX COFDM Series
board A4A7 to connectors on the predriver assembly and the IPA backplane board, see
Figure 4-6. Table 4-4 provides the connections for these busses.
4.4.3.4.1 PA BP (Backplane) Busses 1 Through 4.
The BP 1 through BP 4 PA backplane busses provide control and monitoring to
backplane boards A5, A6, A8, and A9 respectively. They control and monitor the 16 PA
modules (four modules for each backplane). These busses run from connectors J2A and
J2B of the two PA interface boards A4A7 and A4A8 to connectors on the PA
backplanes, see
Figure 4-6. Each of these busses have 50 conductors. Table 4-5
provides the connections for these busses.
Table 4-4 Predriver and IPA Drive A and Drive B Control Busses
Predriver Assembly Connectors J1 and J2, and IPA Backplane Connectors J1 and J5
Pin Function Pin Function Pin Function Pin Function
1 +15V from TCU 14 N C 27 N C 40 Gnd
2 IPA A or B Fault 1 15 N C 28 N C 41 N C
3 IPA A or B Fault 2 16 Gnd 29 N C 42 N C
4 IPA A or B Fault 3 17 IPA A or B On/Off 30 N C 43 Gnd
5 IPA A or B Prsnt 18 Off/On Predrvr A or B 31 Gnd 44 IPA A or B Out Pwr
6 Gnd 19 N C 32 TP1 - IPA A or B 45 IPA A or B Sum Current
7 N C 20 N C 33 Pwr Cntl Predrvr A or B 46 Gnd
8 N C 21 Gnd 34 Gnd 47 Cnt Predriver A or B
9 N C 22 N C 35 Phase Cntl Predrvr A or B 48 In Pwr Predrvr A or B
10 N C 23 N C 36 N C 49 Gnd
11 Gnd 24 N C 37 Gnd 50 N C - Predrvr, Gnd - IPA
The Ground serves as an
IPA module interlock.
12 N C 25 N C 38 N C
13 N C 26 Gnd 39 N C
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