Network 8000: Power Supply Board Troubleshooting
LESSON SUMMARY: This lesson is designed to assist the user in troubleshooting an OEM Power Supply Board for Network 8000.
Special Tools Needed: Digital Multimeter, Phillips Screwdriver
⚠ CAUTION: THIS LESSON MAY INCLUDE INSTRUCTIONS TO TEST HAZARDOUS VOLTAGES (120V-240V) THAT CAN CAUSE SERIOUS INJURY OR DEATH. IT IS RECOMMENDED THAT A LICENSED ELECTRICIAN BE CONTRACTED TO PERFORM SUCH TESTS.
🛑 STOP: ALWAYS TURN OFF THE POWER TO THE SATELLITE BEFORE REMOVING ELECTRONIC COMPONENTS.
The Power Supply Board in a Network 8000® satellite is responsible for receiving and distributing power to components throughout the satellite. If the Power Supply Board is damaged, or is not functioning properly, there will be a disruption in the functionality of components throughout the satellite. To determine if your Power Supply Board is damaged, follow the guided steps below.
*The following troubleshooting instructions apply to the OEM Power Supply Board for Network 8000®.
Input to the Power Supply Board from the Power Transformers comes in via the connector labeled “J20” and consists of two separate 24VAC sources. Output power to the Timing Mechanism exits via the connector labeled “J9” and consists of multiple AC and DC Voltages.
The Power Supply Board is equipped with four red LEDs that can indicate a failure if one or more of the LEDs are not illuminated, however, all four LEDs being illuminated does not necessarily indicate a properly functioning Power Supply Board. The Power Supply Board has several important output voltages that do not have a corresponding LED indictor, therefore, measuring each voltage individually using a multimeter is the most effective way to verify functionality.
If one or multiple red LEDs are not illuminated, begin by measuring the input power.
*Note: The low-voltage power in the Network 8000 is electrically isolated from Earth Ground (cabinet). Attempting to use Earth Ground as a reference when measuring system voltages will result in readings that are inconsistent and meaningless.
Testing Input Power to the Power Supply Board:
If present, remove the cover on the connector that is plugged into the J20 connector in order to gain access to the contacts.
Using a multimeter set to the AC Voltage setting, place one probe of the multimeter on J20 pin 1 and one probe of the multimeter on J20 pin 3.
The multimeter should display a reading of 24VAC; up to 30VAC is acceptable.
Using a multimeter set to the AC Voltage setting, place one probe of the multimeter on J20 pin 2 and one probe of the multimeter on J20 pin 4.
The multimeter should display a reading of 24VAC; up to 30VAC is acceptable.
If the multimeter displays a reading of 0 or a low voltage when measuring between pins 1 and 3 and 2 and 4 on the J20 connector, the Power Transformer, one or multiple wires, or a cable in the satellite could be damaged.
If the multimeter displays a reading of 0 when measuring the voltage between pins 1 and 3 and 2 and 4 on the J20 connector, this could indicate a lack of power to the satellite or a blown input power fuse.
If the voltage reading displayed on the multimeter when measuring between pins 1 and 3 and 2 and 4 on the J20 connector is low or 0, additional troubleshooting within the satellite is required.
If the voltage reading displayed on the multimeter when measuring between pins 1 and 3 and 2 and 4 on the J20 connector 24-30VAC, proceed to measure the output voltages on the J9 connector.
Measuring Output Voltages on the J9 Connector:
*Note: The following voltage measurements should be taken with the Timing Mechanism disconnected from the Power Supply Board.
Start by powering off the satellite by removing one of the two fuses at the bottom of the satellite.
Next, unplug the Faceplate-to-Power Cables from the Timing Mechanism, leaving the Faceplate-to-Power Cable plugged into the Power Supply Board.
Power the satellite back on by replacing the fuse at the bottom of the satellite.
If present, remove the cover on the connector that is plugged into J9 in order to gain access to the contacts.
Using a multimeter set to the DC Voltage setting, place one probe of the multimeter on the GND test point and one probe of the multimeter on J9 pin 3.
The multimeter should display a reading of 0 volts DC.
Using a multimeter set to the DC Voltage setting, place one probe of the multimeter on the GND test point and one probe of the multimeter on J9 pin 12.
The multimeter should display a reading of 0 volts DC.
If the multimeter displays a reading that exceed 0.5 volts, the Power Supply Board has failed or the cable is making poor contact with the J9 connector.
If both readings are 0, or very close to 0, continue measuring voltages on J9, using the GND test point as your measurement reference.
DC Voltages should read as follows:
Pin 2: -5 volts DC (-4.9 to -5.2 acceptable)
(Skip pins 3 & 4)
Pin 5: 12 volts DC (+11.8 to +12.2 acceptable)
Pin 6: 36 volts DC (+33 to +42 acceptable)
Pin 7: +6 volts DC (+5.9 to +7.0 acceptable)
Pin 8: -9 volts DC (-8.1 to -9.1 acceptable)
(Skip pin 9)
Pin 10: +6 volts DC (+5.9 to +7.0 acceptable)
Pin 11: -9 volts DC (-8.1 to -9.1 acceptable)
(Skip pin 12)
Pin 13: -32 volts DC (-29 to -34 acceptable)
Pin 14: -24 volts DC (-22 to -26 acceptable)
Pin 15: -24 volts DC (-22 to -26 acceptable)
(Pin 16 is not used)
If all readings are within the acceptable range, proceed to measure the AC Voltages on the J9 connector, using the GND test point as your measurement reference.
Using a multimeter set to the AC Voltage setting, measure the following pins:
AC Voltages should read as follows:
Pin 1: 27 volts AC (24 to 30 acceptable)
Pin 14: 5.2 volts AC (5.0 to 5.4 acceptable)
Pin 15: 5.2 volts AC (5.0 to 5.4 acceptable)
Measure the AC Voltage between Pin 14 and Pin 15. The multimeter should display a reading of 10.4 volts AC (10.0 to 11.4 acceptable).
If the multimeter displays voltage readings that are not within the acceptable range, the Power Supply Board has failed or the cable is making poor contact with the J9 connector.
If the voltage readings were all within the acceptable range, power off the satellite and plug the two Faceplate-to-Power cables back into the Timing Mechanism.
After the two Faceplate-to-Power Cables have been plugged back into the Timing Mechanism, proceed to measure the Power Supply Board output voltages on the J9 connector.
Measuring Output Voltages on the J9 Connector (again):
Using a multimeter set to the DC Voltage setting, place one probe of the multimeter on the GND test point and one probe of the multimeter on J9 pin 3.
The multimeter should display a reading of 0 volts DC.
Using a multimeter set to the DC Voltage setting, place one probe of the multimeter on the GND test point and one probe of the multimeter on J9 pin 12.
The multimeter should display a reading of 0 volts DC.
If the multimeter displays a reading that exceed 0.5 volts, the Power Supply Board has failed or the cable is making poor contact with the J9 connector.
If both readings are 0, or very close to 0, continue measuring voltages on J9, using the GND test point as your measurement reference.
DC voltages should read as follows:
Pin 2: -5 volts DC (-4.9 to -5.1 acceptable)
(Skip pins 3 & 4)
Pin 5: 12 volts DC (+11.8 to +12.2 acceptable)
Pin 6: 30 volts DC (+28 to +32 acceptable)
Pin 7: +6 volts DC (+5.8 to +6.2 acceptable)
Pin 8: -9 volts DC (-8.8 to -9.2 acceptable)
(Skip pin 9)
Pin 10: +6 volts DC (+5.8 to +6.2 acceptable)
Pin 11: -9 volts DC (-8.8 to -9.2 acceptable)
(Skip pin 12)
Pin 13: -29 volts DC (-26 to -31 acceptable)
Pin 14: -21 volts DC (-19 to -23 acceptable)
Pin 15: -21 volts DC (-19 to -23 acceptable)
(Pin 16 is not used)
If all readings are within the acceptable range, proceed to measure the AC Voltages on the J9 connector, using the GND test point as your measurement reference.
Using a multimeter set to the AC Voltage setting, measure the following pins:
AC Voltages should read as follows:
Pin 1: 12 volts AC (10 to 14 acceptable)
Pin 14: 3.5 volts AC (3.3 to 3.8 acceptable)
Pin 15: 3.5 volts AC (3.3 to 3.8 acceptable)
Measure the AC Voltage between Pin 14 and Pin 15. The multimeter should display a reading of 10.4 volts AC (10.0 to 11.4 acceptable).
If the multimeter displays voltage readings that are not within the acceptable range, the Power Supply Board, Timing Mechanism and/or one or more of the following components could be damaged and overloading the Power Supply Board:
– Standard Modem
– Pump Card
– Voltage Monitor
Browse our extensive line of Solutions for Network 8000 here.
Lesson tags: toro, network 8000, toro network 8000, network 8000 repair, network 8000 help, network 8000 troubleshooting, network 8000 exchange, network 8000 motherboard, network 8000 power supply board, boardtronics
©2022 BoardTronics, Inc. All Rights Reserved. (Read Copyright Statement Here)