4-18 888-2629-200 10/6/10
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
Maxiva ULX COFDM Series
Table 4-7 Exciter B Control/Status Connector J1B on TCU (9 pin female dsub)
4.4.3.7 PS Monitor Card
The PS monitor card is located in the TCU. The board’s primary function is to provide
AC power supply monitoring, fuse monitoring, inlet and outlet temperature sensing,
coolant flow, leak detection, cooling fan tachometer monitoring, and PA Driver switch
interface. A simplified block diagram for the board is given in Figure 4-8.
Pin Signal Description
1 /EXC_B_MUTE_CMD Open collector output- Exciter B mute
command-100mA sink capability @ 0.8Vdc max.
1K ohm pull up to +5V. TVS protection.
Active’0’ state to command exciter mute.
2 /EXC_B_EQUALIZER_HOLD_CMD Open collector output- Exciter B equalizer hold
command-100mA sink capability @ 0.8Vdc max.
1K ohm pull up to +5V. TVS protection.
Active’0’ state to command exciter equalizer to
hold.
3 /EXC_B_ACTIVE_CMD Open collector output- Exciter B active
command-100mA sink capability @ 0.8Vdc max.
1K ohm pull up to +5V. TVS protection.
Active’0’ state to command exciter equalizer to
"on air".
4 NC No connection
5 GND Ground
6 GND Ground
7 /EXC_B_MUTE_STATUS CMOS input-Exciter B mute status-’0’ on this
line indicates exciter is muted. TVS protection.
1K pull up to +5Vdc
8 /EXC_B_RF_PRESENCE_STATUS CMOS input-Exciter B RF presence status-’0’ on
this line indicates exciter is present. TVS
protection. 1K pull up to +5Vdc.
9 /SUMMARY_FAULT CMOS input-Exciter B summary fault-’0’ on this
line indicates exciter has a fault. TVS protection.
1K pull up to +5Vdc.
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