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Motorola Astro Digitalport Saber Troubleshooting 68p81076c10 A Manual

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    Page 1 10-1 Troubleshooting Charts 10 This section contains detailed troubleshooting flowcharts. These charts should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory section prior to troubleshooting a radio. Most troubleshooting charts end up by pointing to an IC to replace. It is not always noted, but is good practice...
    Page 2 10-2 Chart 1 . 800MHz Radio Main Troubleshooting Chart NONO MAEPF-24396-A Good Power- Up Self Test?Is There TX Power?Is TX Deviation OK? NO NOYES YES YES YES YES YES NONO NO Receive Audio?Poor SINAD?ENDSTARTButtons Functioning?Radio Keyload Failure? Go to No Receiver Audio Chart C.29See Button Test Chart C.20Error Message? Display Model? Go to No Transmit Audio Chart C.26Go to Transmitter Chart C.37 NO YES NO YES YES See Keyload Failure Chart C.19 NOYES Go to No Receiver RF Chart C.30Go to DC Switch...
    Page 3 10-3 Chart 3 . Radio Power-Up Fail Radio Power-Up Failure.Verify standard bias per table Table 3 pertaining to host µC. No Yes Standard Isolate and repair problem. See chart C.5bias OK?. Using RSS, verify radio is not inhibited. Signal @ U206 Source OE* U204 WE* U204 HD0-HD7 U204 4XECLK U204 HA0-HA4, HA14_IN, HA15_IN, HA16,HA17 U204 CSIO1* U204 CSPROG* U204 Verify Host Port: Use ohmmeter to electrically verify following signal connections to source IC: Signal @ U202 Source HA0-HA13 U206 HD0-HD7 U204...
    Page 4 10-4 Chart 4 . Bootstrap Fail Note: This configuration indicates the µC is in Bootstrap mode waiting for data. Host µC Bootstrap Failure. Synopsis The host µC bootstrap mode is used during reprogramming of the host µC and DSP FLASH ROMs. Refer to appropriate Theory of operation section for description of bootstrap operation. Since the operating code is downloaded through the serial bus instead of from the ROM and is initially executed in the µC internal RAM, this is a good method of verifying...
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