Troubleshooting 3-19
3.3.4.1.2 Sequencing
The sequence of applying the supply and control voltages is critical, and if not followed exactly then
the PA HW may fail. The following sequences for power up and power down are to be followed for
any functional testing performed.
If method 1 is used, and a mule base station/repeater with application firmware controlling the full
base station/repeater HW is used, the correct sequencing will occur automatically and this section
does not apply in that case.
If method 2 above is used, and a mule base station/repeater PS only is used, the 28.6 V and 14.2 V
power supplies will come up or go down in the proper order. Note that voltages may not be exactly
28.6 V and
14.2 V, but must be within the power supply tolerances. For this method, the power supply should be
plugged in at the step where 28.6 V and 14.2 V potentials are applied or removed, but all steps
preceding and following those steps must be followed as shown.
If method 3 above is used, the following sequence applies.
Powering Up the PA:
1. Disable PA by applying 0 V to pins 2 and 4 of J6000
2. Apply 28.6 V main supply voltage to pins 3 and 6 of J6001
3. Apply 14.2 V main supply voltage to pins 1 and 4 of J6001
4. Apply 12 dBm for UHF to RF input connector J2000
5. Apply the PA Enable signal 5.0 V to pin 2 of J6000, if the PA is to be enabled
6. If RF output power required, very slowly increase V_Control signal from 0 V on pin 4 of
J6000 until desired output power is achieved. Step size of less than 0.05 V should be
taken, else severe RF output power may result and damage to the HW could occur.
During this step, main supply voltage bus currents should be monitored to make sure
excessive currents do not result.
Powering Down the PA:
1. Slowly decrease V_Control to 0V on pin 4 of J6000
2. Disable PA by applying 0 V to pin 2 of J6000
3. Disable RF input to PA
4. Remove 14.2 V main supply voltage (set to 0 V) to pins 1 and 4 of J6001
5. Remove 28.6 V main supply voltage (set to 0 V) to pins 3 and 6 of J6001
If supply currents for either 28.6 V or 14.2 V bus become
excessive for the resulting output power, then the
troubleshooting steps for low or no output power should be
followed to determine the problem.
C a u t i o n
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