6-20
888-2406-002
WARNING: Disconnect primary power prior to servicing.
Troubleshooting
6.10 PA Signal Tracing
Tracing signals from the PA Controller to the PAs can be very confusing. The
problem lies in the fact that the PA Controller Boards and the Z-Plane are generic
except for the ID jumper settings which designate the board for a specific position.
Since the schematics for each of these boards must apply to any position, the
labeling is also generic.
For instance, the PA Controllers have the ability to control and monitor 8 amplifiers.
These lines to and from the amplfiers are labeled PA1-PA8 on the PA Controller
schematic. Since PAC#1 and PAC#2 control and monitor different amplifiers it
would not be possible to put the correct labels on the schematic with respect to
specific amplifier connections. As an example, the gate control voltage to amplifier
B4 comes from PA Controller#1. Tracing the signal from the B4 gate voltage input
back to PA Controller #1 would reveal that it is actually connected to the
PA8_GATE signal on the PA Controller schematic.
Table 4-1 on page 4-59 (in Section IV) is intended to ease this confusion. For
instance, in the process of troubleshooting a PA problem it is found that amplifier
B2 has no gate control voltage. Tracking this back to its source can be tricky. Table
4-1 gives you the necessary information to skip steps or at least verify your path.
According to Table 4-1, amplifier B2 is controlled by PAC#2. Following this across
the table, the PAC#1 output labeled PA6_GATE, on the PA Controller schematic, is
the control line for B2. Following this on across, this signal would also pass through
the Divider schematic as PA6 and connect to the combiner connector J6. The last 2
columns give the Isolation Switch # and the Isolation Resistor # associated with the
PA in question. In this case K6 and RT6 are used with amplifier B2. The Isolation
switches and resistors are located on the Isolation Board attached to the Z-Plane.
Also be aware that there could also be a problem on the RFI Filter boards which are
in series with all of the lines between the controllers and the PAs.
Summary of Contents for Platinum Z2 CD
Page 4: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 6: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 8: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 10: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
Page 70: ...3 14 888 2406 002 WARNING Disconnect primary power prior to servicing Operator Guide ...
Page 130: ...4 60 888 2406 002 WARNING Disconnect primary power prior to servicing Overall System Theory ...
Page 194: ...6 38 888 2406 002 WARNING Disconnect primary power prior to servicing Troubleshooting ...
Page 196: ...7 2 888 2406 002 WARNING Disconnect primary power prior to servicing Parts List ...
