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NETWORK 8000 HOW-TO: checking power supply voltages

To power down a Network 8000 cabinet, remove one of the two main fuses located towards the bottom inside of the cabinet.


NOTE: The Power Supply voltages must be measured and verified with the Power Supply unloaded (all other satellite components disconnected from the Power Supply 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 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 faceplate
    • Remove the four faceplate corner mounting screws.
    • Carefully lift the faceplate out of its mounting hole, taking caution not to allow any of the attached ribbon cables to be tightly pulled.
    • Gently unplug the 2 power ribbon cables from the faceplate.[Picture]
    • Lower the faceplate 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 faceplate, and carefully poke the cable down below the faceplate mounting surface if necessary.
  3. If present, carefully remove the protective covers from the 2 ribbon cable connectors that are plugged into the edge connector on the Power Supply.[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-posirion connector from the Power Supply, reapply satellite cabinet power, and measure voltages again on the unplugged 4-position Power Supply 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 then the Power Supply is faulty. Send it in for reconditioning. Create a UPS Shipping Label HERE.
  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 then there is a transformer and/or wiring problem in the satellite cabinet. Transformer configurations and proper voltages can be found HERE. If the transformer is not putting out correct voltage, new replacement transformers can be found HERE
  12. Test voltages on large edge connector. The pins are numbered on the connector according to this diagram. [Picture]
    • 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 is faulty. Send it in for repair.
  14. If all of the voltages measured in step 12 are within the acceptable ranges listed, then continue on to the Loaded Voltage Test.
 

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 faceplate.
    • Remove the four faceplate corner mounting screws if installed.
    • Carefully lift the faceplate out of its mounting hole, taking caution not to allow any of the attached ribbon cables to be tightly pulled.
    • Gently plug the 2 power ribbon cables from the faceplate. [Picture]
    • Lower the faceplate 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 faceplate, and carefully poke the cable down below the faceplate mounting surface if necessary.
    • Install and tighten down the four faceplate 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 faceplate, modem, or other PC board component in the satellite cabinet until the power supply 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 with a known good unit.
  7. If replacing the Power Supply fixes the trouble then the original Power Supply is faulty. Send it in for reconditioning. Create a UPS Shipping Label HERE.
  8. If the trouble is still present after a known good Power Supply is installed, continue to troubleshoot the satellite cabinet by replacing the following with known good units.
    • Faceplate
    • Ribbon Cable connecting the Power Supply to the faceplate
    • Modem
    • Pump Card
    • Valve Voltage Monitor (if so equipped)
    • Ribbon Cable connecting the modem to the faceplate
    • Faceplate main output harness or Distribution Board as applicable