Agilent Technologies 8000 Series Especificaciones Pagina 81
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Chapter 5: Troubleshooting
To check the backlight inverter voltages
81
To check the backlight inverter voltages
The backlight inverter board A5 is located in the front-left corner of the oscilloscope (as you face
the front panel).
• There is an input connector at one side of the board.
• There are two output connectors on the other end of the board, that power the two backlights
which are inserted into the flat panel display.
The output voltage is approximately 300-450 V
rms
, 40 kHz (measured differentially between the
two wires) when the backlight is illuminated. The voltage is approximately 1 kV before the
backlight tube is illuminated. A red LED on the backlight inverter board illuminates when the
output voltage is present.
When the backlight goes off (when the oscilloscope’s operating system switches to screen saver
mode) the voltage on pins 1 and 2 (with respect to ground) slowly decays to 0 V.
The outputs are controlled by the input. Notice that input pin 5 goes low to enable the output
voltage. These pins can be reached at J1 on the display board A11 on systems that use the Intel
motherboard, or on connector CN10 on systems that use the ADLINK motherboard.
Table 5-5
Backlight Inverter Board Input Voltages
Input Pin # 7 65432 1
Backlight OFF 0 V 0 V 0 V 0 V 0 V 0 V 0 V
Backlight ON 5 V 0 V 2.5 V 0 V 0 V 12 V 12 V
- Service Guide 1
- In This Book 5
- Contents 7
- 6 Replacing Assemblies 8
- 7 Replaceable Parts 8
- 8 Theory of Operation 8
- General Information 10
- Accessories supplied 13
- Accessories available 14
- Options available 15
- ± 5°C from the temperature 16
- Environmental Conditions 17
- Measurement Category 17
- Oscilloscope Dimensions 18
- Preparing for Use 19
- Setting Up the Oscilloscope 20
- To inspect package contents 21
- Figure 2-1 21
- To connect power 22
- Attaching the Probe Connector 25
- Probing the Circuit 26
- To connect the digital probe 28
- Digital probe lead set 29
- 40-pin Connector Pinout 30
- Figure 2-14 31
- To turn on the oscilloscope 32
- To turn off the oscilloscope 32
- Probe Compensation 33
- To clean the oscilloscope 35
- Testing Performance 37
- Clear Display 39
- Averaging 39
- Specifications 39
- Performance Test Procedures 39
- Fluke MET/CAL Procedures 39
- To test the DC calibrator 40
- To test input resistance 42
- Connect the equipment 43
- Select Close 45
- (Supply) Minimum Maximum 45
- Set the scale from the 46
- Set the offset from the 46
- To test bandwidth 47
- To verify threshold accuracy 49
- Connections 50
- High-to-Low Transitions 55
- Threshold Voltage Setting V2 56
- Low-to-High Transitions 57
- To test time scale accuracy 59
- Oscilloscope 60
- Sine Wave Source 60
- Frequency Reference 60
- Agilent Technologies 64
- Range Supply Limits 65
- Performance Test Record 66
- Calibrating and Adjusting 67
- To run the self calibration 69
- Troubleshooting 71
- Default Setup 73
- 54830F01a 75
- Primary Trouble Isolation 76
- Run oscilloscope self-tests 77
- Self Calibration 78
- Performance” on page 37 78
- No Display Trouble Isolation 79
- Input Pin # 7 65432 1 81
- Replace any shorted assembly 84
- Replace the power supply 84
- To check probe power outputs 85
- To Check the keyboard 86
- To check the LEDs 87
- Intel D915GUX Motherboard 88
- To Reset 89
- 5 and 7 89
- To setup the BIOS 91
- Figure 5-12 93
- Software Revisions 94
- Replacing Assemblies 95
- Bottom sleeve fasteners 99
- Removing bottom sleeve 100
- Connecting Mylar flex sables 101
- Disconnecting W8 104
- Access Hole 105
- Removing the BNC nuts 108
- Figure 6-17 112
- Opening in side of 131
- Fan control board cables 131
- Acquisition board cables 131
- Figure 6-32 132
- Lift board out of chassis 134
- To remove and replace a fan 135
- Mylar flex cables 136
- T10 Torx Screws 136
- Replaceable Parts 137
- Power Cords 139
- Exploded Views 140
- Replaceable Parts List 145
- Theory of Operation 149
- Figure 8-1 150
- Logic Trigger 154
- Attenuator Theory 155
- Acquisition Theory 155
- • Trigger levels 156
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