9/15/06
888-2586-001
6-33
WARNING: Disconnect primary power prior to servicing.
Section 6 Troubleshooting
Platinum Z16HD+
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 amplifiers are labeled PA1-PA8 on the PA Controller
schematic. Since PAC#1 through PAC#4 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 A4 comes
from PA Controller#2. Tracing the signal from the A4 gate voltage input back to PA
Controller #2 would reveal that it is actually connected to the PA7_GATE signal on the
PA Controller schematic. PAC#4 also has a PA7_GATE output, but it goes to amplifier
C4.
"Table 4-3 PA Control Distribution" on page 4-69 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. This table
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#2 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 each 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.
6.14 PA Controller Faults
The following paragraphs give a detailed description of all faults associated with the PA
Controller Boards. This mostly deals with the PAs and Isolation resistors. A quick
reference of these faults is given in Table 6-3 on page 6-48.
6.14.1 General PA Troubleshooting
As a general rule, the first step in troubleshooting any PA (or IPA) problem is to swap
the PA or the entire module with another in the transmitter. If the problem moves with
the PA, you have verified that it is the PA and not the slot to which it is connected. If the
problem appears to stay with the particular slot, then more advanced troubleshooting of
the cabling back to the controller should be explored. This is where can save a lot of
time.
Summary of Contents for Platinum Z16HD+
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