Agilent Technologies 54624A, 54621D, 54622D Disconnect the ribbon cable from the display board

Models: 54621A 54622A 54622D 54621D 54624A

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6Disconnect the ribbon cable from the display board.

Troubleshooting

To check out the oscilloscope

5Disconnect the display ribbon cable from the system board. Then check the signals on the system board listed in Table 5-2.

Table 5-2

Display Signals on the System Board – All Oscilloscopes

 

 

 

 

 

 

 

 

Signal

Name

Frequency

Pulse Width

Voltage

 

J900 Pin 14

Hsync

19.72 kHz

3.0 ms

4.5 Vp-p

 

J900 Pin 13

Vsync

60.00 Hz

253.5 ms

4.5 Vp-p

If the signals are good, replace the display assembly.

If the signals are not good, replace the system board.

6Disconnect the ribbon cable from the display board.

7Check the low voltage power supply. Go to “To check the Low Voltage Power Supply” on page 5-11.

If the voltages are within the test limits, replace the display assembly. If the voltages are not within the test limits, follow these steps:

a Disconnect the power cord.

b Disconnect the ribbon cable from the power supply.

c Connect the dummy load to the power supply connector.

d Connect the power cord. Then measure the power supply voltages again. See the new tolerances in Table 5-3.

Table 5-3

Low Voltage Power Supply Tolerances

 

 

 

 

Supply Voltage

Tolerance

 

+5.1 V

±153 mV (+4.947 V to +5.253 V)

 

-5.2 V

±156 mV (-5.04 V to -5.36 V)

 

+15.75 V

+1.260 V, -787 mV (+14.963 V to +17.010 V)

 

+3.3 V

±100 mV (+3.20 V to +3.40 V)

If the voltages are within the test limits now, replace the system board.

If the voltages are still not within the test limits, replace the power supply.

5-9

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Agilent Technologies 54624A, 54621D, 54622D, 54622A, 54621A manual Disconnect the ribbon cable from the display board