288 Keysight N9038A MXE Service Guide
Front End Control
A15 Front End Control Assembly Troubleshooting
A12 YTF Preselector Control - (Option 508 & 526 only)
A problem with the A12 YTF Preselector assembly could be caused by either a
failure of the assembly itself, the control logic sent to it, or damage to the cable
between the two. This section will verify the functionality of the control logic
coming from the A15 Front End Control assembly. If after verifying that the
control logic in working properly refer to
for further troubleshooting information on the A12 YTF Preselector
assembly itself.
This section will verify the control signals from the A15 Front End Control
assembly to the A12 YTF Preselector assembly. There are only three controls
for the A12 YTF Preselector:
1.
Serial Communication for Assembly Identification
2.
Supply Voltage for Serial Communications
3.
Main Coil Current
The status of the supply voltage and main coil current can be measured on the
Front End Control Test board assembly with the use of three test points, J31,
P8 Pin 1, and P8 Pin 2, as seen in
.
Figure 8-11
A12 YTF Preselector Control Front End Test Board
When making Main Coil Current measurements R119, R120, and R121 on the Front End Control
Test board can get VERY HOT. Be careful not to touch them or place any combustible objects in
contact with them. Also, do not clip test leads to P8 and leave the instrument unattended while
powered on.
Содержание N9038A
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Страница 66: ...66 Keysight N9038A MXE Service Guide Boot Up and Initialization Potential Problems During Boot Process ...
Страница 130: ...130 Keysight N9038A MXE Service Guide Instrument Messages Condition Messages ...
Страница 216: ...216 Keysight N9038A MXE Service Guide RF Preselector Section RF Preselector Section Troubleshooting ...
Страница 268: ...268 Keysight N9038A MXE Service Guide L O Synthesizer A14 L O Synthesizer Assembly Troubleshooting ...
Страница 354: ...354 Keysight N9038A MXE Service Guide Analog Digital IF A3 Digital I F Troubleshooting ...
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Страница 407: ...Keysight N9038A MXE Service Guide 407 Block Diagrams Block Diagrams N9038A RF Input Option 503 508 526 Block Diagram ...
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Страница 428: ...Keysight N9038A MXE Service Guide 447 Block Diagrams Block Diagrams LO Synthesizer Block Diagram ...
Страница 429: ...448 Keysight N9038A MXE Service Guide Block Diagrams Block Diagrams Reference Block Diagram ...
Страница 430: ...Keysight N9038A MXE Service Guide 449 Block Diagrams Block Diagrams MXE Computer Block Diagram ...
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Страница 436: ...Keysight N9038A MXE Service Guide 455 Service and Diagnostics Menus Service Menus Figure 16 5 Alignments Menu ...
Страница 500: ...Keysight N9038A MXE Service Guide 519 Replaceable Parts Hardware Figure 17 23 Front Frame Exploded View LED Backlight ...
Страница 504: ...Keysight N9038A MXE Service Guide 523 Replaceable Parts Hardware Figure 17 26 Front Frame Exploded View CCFL Backlight ...
Страница 589: ...608 Keysight N9038A MXE Service Guide Assembly Replacement Procedures Motherboard Assembly Figure 18 57 Bottom Screws ...
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Страница 643: ...662 Keysight N9038A MXE Service Guide Instrument Software Software Updates ...
Страница 741: ...760 Keysight N9038A MXE Service Guide Tests Intermittent Unsteady Drifting Disturbances ...