Tait TP9100 Service Manual

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152 Power Supply Fault Finding TP9100 Service Manual© Tait Electronics Limited May 2005Reconnect the 7.5V external supply and turn the power/volumecontrol on. Measure the voltage across C631 (see Figure 8.2).If it is correct, the fault is in the digital area. If not, the fault is on the+3V3 rail excluding the digital area. If no fault can be found visually,try to remove the ICs on the relevant rail. Locate and repair the fault.9. Repair LINK602 (see Figure 8.2), reconnect the external 7.5V powersupply and turn on the radio. If the radio powers up, go to “FinalTasks” on page 134. If the radio fails to power up, the repair failed;replace the main board and go to “Final Tasks” on page 134.10. Disconnect the 7.5V external supply. Check for continuity and faultsaround IC610, D601, L600, R626, R627, R628, and C630 (seeFigure 8.2), and repair any faults11. Repair LINK603, reconnect the external 7.5V power supply and turnon the radio. If the radio powers up, go to “Final Tasks” on page 134.If the radio fails to power up, the repair failed; replace the main boardand go to “Final Tasks” on page 134.voltage across C631: 3.3V DC