Basic
Electronics
Contents
S = Sound
TOC(Table
of Contents)
Chapt.1
Chapt.2
Chapt.3 S
Chapt.4 S
Chapt.5
Chapt.6A Chapt.6B
Chapt.7 S
Chapt.8
Chapt.9 S
Chapt.10
Chapt.11 S
Chapt.12 S
Chapt.13 S
Chapt. 14 S
Chapt. 15 S
Chapt. 16
Chapt. 17
Chapt.
18
Meter
Math
Troubleshooting
Principles
Directory
of Select Electronic Sites
Military
Electronics
Sound
Ranging
Weapons
Electrical
Energy
Cogeneration
HVDC
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Troubleshooting Work Book
Adder Diagnostic Troubleshooting #1
One IC pin has a cold solder joint and is effectively isolated from the PC board. Observe what is working and is not working to determine which one and only one of the IC pins listed below could be the problem.
U2-10
U4-5
U4-3
U2-11
U5-3
Note: Though this problem could occur a several nodes only one of the above is
correct.
Answer Below
Answer Below
Answer Below
U2-10 has a cold solder joint.
Another close choice might appear to be U4-5, but that would still permit signal at U5-5 to vary which it cannot.