382
Chapter 11
Assembly Replacement Procedures
A25 Motherboard
A25 Motherboard
Removing the motherboard requires the removal of all the other
assemblies in the instrument. Take care to note the locations of cables
and screws for correct placement during reassembly.
CAUTION
Use ESD precautions when performing this replacement procedure.
NOTE
The motherboard assembly consists of the A25 motherboard and the
MP35 motherboard shield. A replacement motherboard does not
include the shield, so when you change a faulty motherboard you must
transfer the shield to the new motherboard.
Removal
1. Remove the instrument top brace. Refer to the
removal
procedure.
2. Remove the front frame. Refer to the
removal
procedure.
3. Remove the vertical assemblies. Refer to the
Assemblies (Standard Instrument)”
removal procedure.
4. Remove the A5 assembly. Refer to the
procedure.
5. Remove the A26 assembly. Refer to the
removal procedure.
6. Remove the RF section. Refer to the
removal procedure.
7. Remove the mid-web/fan assembly. Refer to the
removal procedure.
8. Remove the attenuator assembly. Refer to the
removal procedure.
9. Remove the W8 front panel ribbon cable from the motherboard.
Detach the disk drive cover (refer to
remove the W10 disk drive flat flex cable from the motherboard.
10.Using the T-10 driver, remove the 6 screws
(2)
from the bottom of
the instrument as indicated in
.
. Remove the 7 screws
(2)
securing
the A21 motherboard to the deck. Lift the motherboard out of the
deck.
Summary of Contents for E4440A
Page 12: ...12 Contents...
Page 13: ...13 1 Overview...
Page 42: ...42 Chapter1 Overview Contacting Agilent Technologies...
Page 43: ...43 2 Overall Troubleshooting...
Page 69: ...69 3 Troubleshooting the RF Section E4440A E4443A E4445A...
Page 89: ...89 4 Troubleshooting the RF Section E4446A E4447A E4448A...
Page 111: ...111 5 Troubleshooting the Synthesizer Section...
Page 125: ...125 6 Troubleshooting the IF Section...
Page 144: ...144 Chapter6 Troubleshooting the IF Section Verifying the A7 Digital IF Board...
Page 145: ...145 7 Troubleshooting the Processor Power Supply and Display...
Page 165: ...165 8 Hardware Options...
Page 184: ...184 Chapter8 Hardware Options Verifying Option 122 or 140 Wide Bandwidth Digitizer...
Page 186: ...186 Chapter8 Hardware Options Verifying Option 122 or 140 Wide Bandwidth Digitizer...
Page 206: ...206 Chapter8 Hardware Options Verifying Option 124 Y Axis Video Out...
Page 207: ...207 9 Block Diagrams...
Page 211: ...Chapter 9 211 Block Diagrams Signal Mnemonics Figure 9 1 Graphic Symbols...
Page 212: ...212 Chapter9 Block Diagrams Overall Block Diagrams Overall Block Diagrams...
Page 214: ...214 Chapter9 Block Diagrams Overall Block Diagrams...
Page 216: ...216 Chapter9 Block Diagrams Overall Block Diagrams...
Page 217: ...Agi l ent MOTHERBOARD E4440 60001 se860a...
Page 218: ...218 Chapter9 Block Diagrams Overall Block Diagrams...
Page 220: ...220 Chapter9 Block Diagrams Overall Block Diagrams...
Page 221: ...221 10 Replaceable Parts Lists and Locations...
Page 252: ...252 Chapter10 Replaceable Parts Lists and Locations Hardware Figure 10 4 Major Assemblies...
Page 256: ...256 Chapter10 Replaceable Parts Lists and Locations Hardware Figure 10 6 YTO Assembly...
Page 267: ...Chapter 10 267 Replaceable Parts Lists and Locations Hardware...
Page 292: ...292 Chapter10 Replaceable Parts Lists and Locations Hardware Figure 10 27 Front Panel Parts...
Page 298: ...298 Chapter10 Replaceable Parts Lists and Locations Hardware Figure 10 32 Rear Frame Hardware...
Page 304: ...304 Chapter10 Replaceable Parts Lists and Locations Hardware...
Page 305: ...305 11 Assembly Replacement Procedures...
Page 383: ...Chapter 11 383 Assembly Replacement Procedures A25 Motherboard Figure 11 47 Bottom Screws...
Page 409: ...409 12 Post Repair Procedures...
Page 429: ...429 13 Firmware Upgrades...
Page 432: ...432 Chapter13 Firmware Upgrades Firmware Upgrades Including Measurement Personality Upgrades...