Harris Platinum Z2 CD, Manual

Page: 185 / 196

888-2406-002 6-29
WARNING: Disconnect primary power prior to servicing.
Troubleshooting
6.12.3 Non Critical Power Supply Faults
Non-Critical faults provide indications that there is a problem with the power
supply which is not serious enough to take any immediate transmitter action, but
should be corrected as soon as possible.
6.12.3.1 PS#_TAP#, Power Supply Tap Fault
Detection is based on the level of 50/60 Hz ripple at the output of a two stage, DSP
based, band pass filter in the PS Controller. The BPF is looking at the DC input
voltage data from the PA Power Supply (+52Vdc). It is interpreted as an indication
of a transformer secondary fault which could be a fuse or SCR.
If one of the taps has been detected as faulty the next available Tap (lower ones are
the first choice and the next upper one is the second choice) will be connected
depending on availability.
Note that if the power supply chassis is not properly grounded, or is completely
floating, this induces a considerable amount of 50/60Hz in the voltage sample lines
to the controller so as to erroneously trip this type of fault. The fault is logged as
PS1_TAP1 (up to TAP4) or PS2_TAP1 (up to TAP4). This fault is the same for 3
phase and single phase transmitters.
Table 6-2 shows the SCRs and fuses on each Rectifier Board associated with each of
the taps. Each transformer has an “A” side and a “B” side Rectifier Board.
Figure 6-7 is a component locator for the 3 Phase Rectifier assembly. It is a top view
with the Rectifier Boards oriented horizontally instead of vertically.
Figure 6-8 is a component locator for the Single Phase power supply Rectifier
assembly.