Harris Platinum Z16HD+ - PSC#+20 V, Fault; PS#_CONFIG, Configuration Fault

9/15/06 888-2586-001 6-41
WARNING: Disconnect primary power prior to servicing.
Section 6 Troubleshooting
Platinum Z16HD+
frequency should be 300 or 360Hz) is interpreted as an indication of a transformer
primary fault or line loss. The filter as a whole is implemented in software via the
microcontroller, hence not requiring any further adjustment. Note that a major voltage
imbalance between one or more phases could also trigger this fault. This fault is not
used in the single phase transmitter.
It is also important to note that there could be several other faults show up as a result of
a phase loss:
• PAC#_VOLTS
• IPA_LOW
• RF SOURCE#_AFC
These faults are incidental and simply occur due to the timing of when the phase loss
occurs and which components see it first.
6.15.2.5 PSC#+20V, Fault
+20 Volts supply fault. Since this voltage is very important for the operation of the
controller (without it no analog reading can be carried out) it is continuously monitored
by the watchdog IC (MAX 705). If it is below 12 volts the fault is tripped.
Troubleshooting will require tracing the +20Vdc back to the Low Voltage Supply to
find out where it is being lost. It originates on the Low Voltage Power Supply but is
regulated to +20V on the Rectifier Boards in the PA Power Supply. The +20V regulator
outputs on each Rectifier Board are diode OR’ed together before being sent to the
Display/Backplane board on cable W21.
6.15.2.6 PS#_CONFIG, Configuration Fault
The controller is continuously checking the configuration, meaning the number of
supplies connected and their identification numbers (ID) As part of this process a check
of the valid configurations is also carried out, not allowing any power supply number
above 4 or two equal ID numbers. The supply number is set by jumpers JP1, JP2 and
JP3 on the Rectifier Boards as follows:
Power Supply ID Chart
PS#1 PS#2 PS#3 PS#4
JP1 IN OUT IN OUT
JP2 OUT IN IN OUT
JP3 OUT OUT OUT IN