Troubleshooting
TDS 340A, TDS 360 & TDS 380 Technical Reference
6–47
Custom Selected Parts
These instruments may use custom selected parts to optimize performance. This
section describes when and how custom components are selected.
Capacitors C230 and C231 may be installed with U204 to compensate for
bandwidth differences between sampler drivers. Follow these steps when
replacing U204.
1. Remove C230 and C231 if they are installed.
2. Replace U204.
3. Check the channel bandwidth and aberrations.
4. If the channel meets bandwidth and aberrations specification, do not install
C230 and C231.
5. If the channel has excessive aberrations while meeting bandwidth, install
C230 and C231.
If U204 is replaced, inductors L212 and L212 may have to be selected to
compensate for variation in the frequency/step response between IC’s. Follow
these steps when replacing U204 or L212 or L213:
1. If U204 is not being replaced, but L212 or L213 are, use the same replace-
ment values as you find installed (see Electronics Parts List and your A13
board for values).
2. If replacing U204, do the following steps:
3. Replace U204.
4. Check the channel bandwidth and aberrations; then do one of the following
steps:
a. If the channel meets bandwidth and aberrations specification, do not
replace L212 or L213.
b. If the channel has excessive aberrations while meeting bandwidth, install
the larger value inductors for L212 and L213 (see Electronics Parts
List), recalibrate (see Adjustment Procedures, Chapter 5), and recheck
bandwidth and aberrations.
c. If the channel has low bandwidth while meeting aberrations, install the
smaller value inductors for L212 and L213 (see Electronics Parts List),
recalibrate, and recheck bandwidth and aberrations.
TDS 360
A12C230 and A12C231
TDS 380
A13L212 and A13L213
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