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
Summary of Contents for TDS 340A
Page 4: ......
Page 12: ...Contents viii TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 16: ...Service Safety Summary xii TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 19: ......
Page 32: ......
Page 42: ...Operating Information 2 10 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 43: ......
Page 49: ...Theory of Operation 3 6 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 59: ...Theory of Operation 3 16 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 60: ......
Page 82: ...Performance Tests 4 22 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 83: ......
Page 91: ...Adjustment Procedures 5 8 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 92: ......
Page 140: ...Troubleshooting 6 48 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 142: ...Repackaging Instructions 6 50 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 143: ......
Page 148: ......
Page 206: ...Electrical Parts List 8 58 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 207: ......
Page 210: ...TDS 340A 360 380 OPTION BOARD BLOCK DIAGRAM A2 0 ...
Page 211: ......
Page 212: ...OPTION BUS AND GPIB A2 TDS 340A 360 380 1 ...
Page 213: ......
Page 214: ...TDS 340A 360 380 ROM PRINTER AND RS 232 A2 2 ...
Page 216: ...PRINTER POWER A3 1 TDS 340A 360 380 OPTION 14 ...
Page 218: ...A5 1 FLOPPY INTERFACE TDS 340A 360 380 ...
Page 222: ...CPU A6 TDS 340A 360 380 1 ...
Page 223: ......
Page 224: ...A6 TDS 340A 360 380 2 FPP POTS ...
Page 225: ......
Page 226: ...LEDS DRIVER A6 TDS 340A 360 380 3 ...
Page 227: ......
Page 228: ...SWITCHES A6 TDS 340A 360 380 4 ...
Page 233: ...9 26 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 234: ...ROOT SHEET A11 A12 TDS 340A 360 0 ...
Page 235: ......
Page 236: ...TRIGGERS A11 A12 TDS 340A 360 1 TDS 340A ...
Page 237: ......
Page 238: ...ATTENUATORS A11 A12 TDS 340A 360 2 TDS 340A TDS 340A ...
Page 239: ......
Page 240: ...TRIGGER LOGIC AND TIME INTERPOLATOR A11 A12 TDS 340A 360 3 ...
Page 241: ......
Page 242: ...TIME BASE CONTROLLER A11 A12 TDS 340A 360 4 ...
Page 243: ......
Page 244: ...SAMPLER A11 A12 TDS 340A 360 5 ...
Page 245: ......
Page 246: ...CPU A11 A12 TDS 340A 360 6 TDS 340A ...
Page 247: ......
Page 248: ...DISPLAY A11 A12 TDS 340A 360 7 ...
Page 252: ...MAIN BLOCK DIAGRAM A13 TDS 380 0 MAIN BOARD 671 3753 00 389 2154 00 ...
Page 253: ......
Page 254: ...TRIGGERS A13 TDS 380 1 ...
Page 255: ......
Page 256: ...ATTENUATORS A13 TDS 380 2 ...
Page 257: ......
Page 258: ...TRIGGER LOGIC AND TIME INTERPOLATOR A13 TDS 380 3 ...
Page 259: ......
Page 260: ...TIMEBASE A13 TDS 380 4 ...
Page 261: ......
Page 262: ...SAMPLER A13 TDS 380 5 ...
Page 263: ......
Page 264: ...CPU A13 TDS 380 6 ...
Page 265: ......
Page 266: ...DISPLAY A13 TDS 380 7 ...
Page 269: ...9 62 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 270: ...MONITOR BLOCK DIAGRAM A26 TDS 340A 360 380 0 ...
Page 271: ......
Page 272: ...INPUTS VIDEO AND VERTICAL DEFLECTION A26 TDS 340A 360 380 1 ...
Page 273: ......
Page 274: ......
Page 286: ...Mechanical Parts List 10 12 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 287: ......
Page 288: ......