9/15/06 888-2586-001 5-7
WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignment
Platinum Z16HD+
5.4 Routine Annual Tests
These tests should be used as part of a routine maintenance program at least once a year.
It should also be done if major combiner components are removed and/or replaced, such
as a Z-Plane or Isolation Board or if cabling is disconnected and re-connected to the Z-
Planes or Isolation Boards.
5.4.1 System Level ISO/Reject Load Ohmmeter Test
The ISO/Reject loads for the three 3dB hybrids can be physically tested using an
ohmmeter. Shut off the transmitter and disconnect primary power at the wall breaker.
Remove a PA module to allow access to the Z-Plane connectors. Connect the common
lead of the meter to the chassis and check pins 14 or 15 on the Z-Plane connector. The
resistance should be 50 ohms +/- 3 ohms for Z-Plane B, C, and D (Z-Plane A will read
as a short via L1, the static drain choke in the hybrid). Checking any slot on one Z-Plane
will test the following reject loads: (See Overall System Block Diagram)
• Z-Plane A - Static Drain Choke (L1 in ABCD hybrid A2A6)
• Z-Plane B - ISO_AB (R1 on the AB hybrid A2A5)
• Z-Pane C - ISO_ABCD (R1 on ABCD hybrid A2A6)
• Z-Plane D - ISO_CD (R1 on CD hybrid A2A7)
Figure 5-1 shows the connector numbering and lettering for the Z-Plane connectors.
This diagram will work when looking at the front or back of the transmitter on any
power block, or PA slot.
Figure 5-1 Z-Plane Connector Pinouts for any PA Module
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