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The Brain

An irrigation tech knowledge base, by BoardTronics.

Topics include troubleshooting, how-to's, and more!

HOW TO:

Check Power Supply Board voltages

NOTE: The Power Supply Board voltages must be measured and verified with the Power Supply Board unloaded (all other satellite components disconnected from the Power Supply Board output) and loaded (all other components plugged in). Some of these voltages will change when going between a loaded and an unloaded condition, and will help to indicate proper or improper Power Supply Board function.


Unloaded Voltage Test

  1. Turn off power to the satellite cabinet. This can be done by removing the two fuses located at the bottom of the cabinet.
  2. Disconnect the power cables from the Timing Mechanism:
    • Remove the four Timing Mechanism corner mounting screws.
    • Carefully lift the Timing Mechanism out of its mounting hole, taking caution not to allow any of the attached ribbon cables to be tightly pulled.
    • Gently unplug the two power ribbon cables from the Timing Mechanism. [Picture]
    • Lower the Timing Mechanism back into place in its rectangular mounting hole. Be sure to check for possible pinching of the small ribbon cable leading to the membrane keypad of the Timing Mechanism, and carefully poke the cable down below the Timing Mechanism mounting surface, if necessary.
  3. If present, carefully remove the protective covers from the two ribbon cable connectors that are plugged into the edge connector on the Power Supply Board. [Picture]
  4. Count the number of positions of the large connector. It should have either 16 or 18 positions. Make a note of this number, as it will determine the points on the connector at which each voltage should be measured. [Picture]
  5. Turn power on to the satellite cabinet by installing the two fuses located at the bottom of the cabinet.
  6. The smaller of the 2 cables should have either a 4-position or a 6-position connector on it. Make note of which connector is installed. [Picture]
  7. Set your voltmeter to AC Volts and test at the 4-position edge connector for 26 Volts (25 to 32V acceptable) between pins 1 & 3 and also between pins 2 & 4.
  8. If both of the 26 Volt readings on the 4-position edge connector are correct, then go to step 12.
  9. If one or both of the 26 Volt readings on the 4-position edge connector are incorrect, then turn power off to the satellite cabinet, unplug the 4-position connector from the Power Supply Board, reapply satellite cabinet power, and measure voltages again on the unplugged 4-position Power Supply Board cable.
  10. If both of the 26 Volt readings on the 4-position connector are correct only when the 4-position cable is disconnected from the Power Supply Board, then the Power Supply Board is faulty and should be repaired or replaced.
  11. If either of the 26 Volt readings on the 4-position connector are incorrect when the 4-position cable is disconnected from the Power Supply Board, then there is a Power Transformer and/or wiring problem in the satellite cabinet. Power Transformer configurations and proper voltages can be found here. If the Power Transformer is not putting out correct voltage, it should be repaired or replaced with a new one.
  12. Test voltages on large edge connector. The pins are numbered on the connector according to this diagram.
    • Set your voltmeter to DC volts.
    • Place the voltmeter's Common lead on pin 3 and test for the following voltages on the connector.

    • PIN NUMBER VOLTAGE
      Pin 2 - 5V (-4.8 to -5.2 acceptable)
      Pin 5 +12V (+11.5 to +12.5 acceptable)
      Pin 6 +37V (+32 to +41 acceptable)
      Pin 7 +6.5V (+6.0 to +7.0 acceptable)
      Pin 8 -9V (-7.8 to -9.2 acceptable)
      Pin 10 +6.5V (+6.0 to +7.0 acceptable)
      Pin 11 -9V (-7.8 to -9.2 acceptable)
      Pin 12 0V (-0.1 to +0.1 acceptable)
      Pin 13 -29V (-26 to -32 acceptable)
      Pin 14 -22V (-21 to -24 acceptable)
      Pin 15 -22V (-21 to -24 acceptable)

    • Set your voltmeter to AC volts.
    • Place the voltmeter's Common lead on pin 3 and test for the following voltages on the connector.

    • PIN NUMBER VOLTAGE
      Pin 1 28V (24 to 31 acceptable)
      Pin 14 5.2V (4.5 to 5.7 acceptable)
      Pin 15 5.2V (4.5 to 5.7 acceptable)

    • Measure between pins 14 and 15 on the connector for 10.4V (9.0 to 11.4 acceptable).
  13. If any of the voltages measured in step 12 are not within the acceptable ranges listed, then the Power Supply Board is malfunctioning and should be repaired or replaced.
  14. If all of the voltages measured in step 12 are within the acceptable ranges listed, then continue on to the Loaded Voltage Test below.

Loaded Voltage Test

  1. Turn off power to the satellite cabinet. This can be done by removing the two fuses located at the bottom of the cabinet.
  2. Reconnect the power cables from the Timing Mechanism.
    • Remove the four Timing Mechanism corner mounting screws if installed.
    • Carefully lift the Timing Mechanism out of its mounting hole, taking caution not to allow any of the attached ribbon cables to be tightly pulled.
    • Gently plug the two power ribbon cables from the Timing Mechanism. [Picture]
    • Lower the Timing Mechanism back into place in its rectangular mounting hole. Be sure to check for possible pinching of the small ribbon cable leading to the membrane keypad of the Timing Mechanism, and carefully poke the cable down below the Timing Mechanism mounting surface if necessary.
    • Install and tighten down the four Timing Mechanism corner screws.
  3. Turn power on to the satellite cabinet by installing the two fuses located at the bottom of the cabinet.
  4. Test voltages on large edge connector. Use the pin numbers as indicated according to this diagram
    • Set your voltmeter to DC volts.
    • Place the voltmeter's Common lead on pin 3 and test for the following voltages on the connector.

    • PIN NUMBER VOLTAGE
      Pin 2 - 5V (-4.8 to -5.2 acceptable)
      Pin 5 +12V (+11.5 to +12.5 acceptable)
      Pin 6 +30V (+29 to +33 acceptable)
      Pin 7 +6V (+5.8 to +6.2 acceptable)
      Pin 8 -9V (-8.6 to -9.4 acceptable)
      Pin 10 : +6V (+5.8 to +6.2 acceptable)
      Pin 11 -9V (-8.6 to -9.4 acceptable)
      Pin 12 0V (-0.1 to +0.1 acceptable)
      Pin 13 -29V (-26 to -32 acceptable)
      Pin 14 -22V (-21 to -24 acceptable)
      Pin 15 -22V (-21 to -24 acceptable)

    • -29V (-26 to -32 acceptable)
    • Place the voltmeter's Common lead on pin 3 and test for the following voltages on the connector

    • PIN NUMBER VOLTAGE
      Pin 1 28V (24 to 31 acceptable)
      Pin 14 3.5V (3.1 to 3.9 acceptable)
      Pin 15 3.5V (3.1 to 3.9 acceptable)

    • Measure between pins 14 and 15 on the connector for 7V (6.2 to 7.8 acceptable).
  5. If any of the voltages measured in step 4 are higher than the acceptable maximum ratings, avoid installing any replacement Timing Mechanism, modem, or other PC board component in the satellite cabinet until the Power Supply Board problem is resolved. Higher than normal voltages can damage the attached components, and replacing them before solving the voltage problems can cause further damage to the new components.
  6. Replace the Power Supply Board with a known good unit.
  7. If replacing the Power Supply Board fixes the trouble then the original Power Supply Board is malfunctioning and should be repaired or replaced.
  8. If the trouble is still present after a known good Power Supply Board is installed, continue to troubleshoot the satellite cabinet by replacing the following with known good units:

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