Tait TB8100 Service Manual page 11

Figure 12.6 Identifying the circuitry in the DC module . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Power Management Unit Fault Finding
Figure 13.1 Identifying the boards and cards in the PMU. . . . . . . . . . . . . . . . . . . . . . . . . 218
Figure 13.2 Recommended test equipment set-up for initial and DC checks. . . . . . . . . . . 222
Figure 13.3 Location of indicator LEDs and DC output connectors . . . . . . . . . . . . . . . . . 223
Figure 13.4 Connections on the fan contact board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Figure 13.5 Checking the DC converter without microprocessor control . . . . . . . . . . . . . 231
Figure 13.6 Location of test point on the battery control card. . . . . . . . . . . . . . . . . . . . . . 232
Figure 13.7 Location of test points on the DC control card . . . . . . . . . . . . . . . . . . . . . . . 233
Figure 13.8 Checking the DC converter with microprocessor control . . . . . . . . . . . . . . . 235
Figure 13.9 PMU alarm thresholds and voltage limits when operating on DC . . . . . . . . . . 238
Figure 13.10 Location of test points on the AC converter board. . . . . . . . . . . . . . . . . . . . . 241
Figure 13.11 AC converter test equipment set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Figure 13.12 Typical gate-source and drain-source waveforms for FETs . . . . . . . . . . . . . . . 244
Figure 13.13 Modifying the PFC control card for testing the AC converter . . . . . . . . . . . . 246
Power Management Unit Disassembly and Reassembly
Figure 14.1 Removing the front and rear panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
Figure 14.2 Disconnecting the AC and DC modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Figure 14.3 Reconnecting the AC and DC modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Power Management Unit Card and Board Replacement
Figure 15.1 Replacing the plug-in cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Figure 15.2 Replacing the auxiliary power supply board . . . . . . . . . . . . . . . . . . . . . . . . . 265
Power Management Unit Spare Parts
Figure 16.1 PMU mechanical assembly - sheet 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
Figure 16.2 PMU mechanical assembly - sheet 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Control Panel Circuit Description
Figure 17.1 Standard, dual base station, and Power Save control panel high level
block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
Figure 17.2 Multi-reciter control panel high level block diagram . . . . . . . . . . . . . . . . . . . 275
Control Panel Servicing
Figure 18.1 Replacing the control panel board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
Figure 18.2 Reconnecting the flexible connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281
Figure 18.3 Replacing the speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
Figure 18.4 Control panel mechanical assembly - standard, Power Save, and
dual base station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Figure 18.5 Control panel mechanical assembly - multi-reciter. . . . . . . . . . . . . . . . . . . . . 286
Subrack Servicing
Figure 19.1 Front panel mechanical assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Figure 19.2 Subrack mechanical assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
Figure 19.3 Cable identification - sheet 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Figure 19.4 Cable identification - sheet 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Figure 19.5 Cables and mechanical parts used in the multi-reciter subrack. . . . . . . . . . . . . 293
TB8100 Service Manual
© Tait Electronics Limited September 2006
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