Motorola Sse 5000 6881094c12 A Manual
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6881094C12-ANovember 11, 2004 Troubleshooting Charts: DC Supply Failure9-7 DC Supply Failure—Page 3 MAEPF-27393-C Voltage = 5.0V+/-5%? Check Voltage at pin 5 of U505 (VOCON) No No No No No No No No Ye sYe s Ye sYe s Ye s Ye s Ye s Ye s Ye s 3 Check 700-800: E6, C15, C16, C17, and D2 VHF: E6, C6, C8, and D2 Voltage = V2?*Components OK? Check R503, D501, C509, C510, and C508Replace Problem Component Replace 700-800: U505 VHF: U1 Replace Problem Component Components OK? Check Voltage at TP7 Check Voltage at TP6Replace U2 Check Voltage at TP5 Check 700-800: D1, E5, C12, C13, and C14 VHF: E5, C3, C4, C5, and D1 Check Voltage at TP3Replace U3 EndReplace U1 Voltage = 5.0V+/-5%?Replace Problem Component Voltage = V2?* NoIs unit VHF? Components OK?Replace Problem Component Check 700-800: D3, R704, C19, and C20 VHF: E7, C9, C10, C11, and D3Components OK? No No Ye s Ye s Replace U5 Voltage = V2?*Replace Problem Component Check E8, C18, C19, C20, and D4Components OK? * per Standard Bias Table * per Standard Bias Table * per Standard Bias Table
November 11, 20046881094C12-A 9-8Troubleshooting Charts: Display Failure 9.5 Display Failure—Page 1 MAEPF-27505-C End Replace LCD Display Check integrity of B700 2.775 V
6881094C12-ANovember 11, 2004 Troubleshooting Charts: Display Failure9-9 Display Failure—Page 2 MAEPF-27506-B Ye s No No Yes Ye s No No No No Ye s Ye sYe s 1 Problem Resolved? Problem Resolved? Problem Resolved? Check REG_SEL at J301, pin 6 Check RESET at J301, pin 6 Verify Signal Path Integrity and correct Verify Signal Path Integrity and correct Verify Signal Path Integrity and correct Check CS at J301, pin 3 3 V = V2?* V = V2?* End EndEnd V = V2?* * per Standard Bias Table * per Standard Bias Table * per Standard Bias Table
November 11, 20046881094C12-A 9-10Troubleshooting Charts: Display Failure Display Failure—Page 3 MAEPF-27507-B Low- Level Pulses Present? Check Active Low Status on both RESET and CS Use an oscilloscope to check for a low-level (0V) pulse occurrence during power-on initialization period. Use an oscilloscope to check for either a low-level (0V) pulse or high-level (0-V2) occurrence during power-on initialization period.No Ye sNo Ye s 3 Signal present at appropriate level? Replace Display Check J301, pins 7 and 10 for appropriate voltage levels (0-V2)Return radio to service depot for further analysis
6881094C12-ANovember 11, 2004 Troubleshooting Charts: Volume Set Error 9-11 9.6 Volume Set Error MAEPF-27401-B No No No Ye sYe s Ye s Volume Set Error Using a voltmeter, measure voltage at U507 pin 1, when volume knob is all the way on. The value should be V2* Voltage Functional? Replace U501 Verify connections and control top/PTT flex connections Volume check OK? Refer to VOCON RX Audio flowchart Verify operation of volume knob using Button Test flowchart ReplaceU507 Volume pot OK? Replace Housing Assembly This chart relates to a failure in the volume set knob. Basic failure modes are as follows: 1) Failure in control top/PTT flex circuit 2) Bad connection 3) Defective volume control potentiometer 4) Defective A/D port in GCAP II 5) Problem in receive audio circuit Synopsis Measure voltage from R526 to GND while moving volume knob from min to max. Max volume is 2.50V * per Standard Bias Table
November 11, 20046881094C12-A 9-12Troubleshooting Charts: Channel Select Error 9.7 Channel Select Error MAEPF-27402-A Replace Housing Assembly Verify operation of channel knob using Button Test flowchart Signals check good at U1 on the controls flex assy.? Verify codeplug programming with RSS. If codeplug checks OK, then replace U1. By studying the adjacent table against the channel numbers that have errors, one signal may be determined to be in error. Verify logic levels at R235, R236, R239, and R241 for each channel. Channel Select Error No Ye s RTA3 (R241) RTA2 (R239) RTA1 (R236) RTA0 (R235) Channel Probe Point 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 01 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
6881094C12-ANovember 11, 2004 Troubleshooting Charts: Button Test9-13 9.8 Button Test MAEPF-27399-A EndButtons correct? Check signal path integrity of button in question Button Test Place radio in Test Mode. Press To p Side Button (Monitor) so display reads CH TEST. This places the radio in button test mode. Then, press the green (display) button to verify codes display as shown in the Button Table at right No Ye sThis chart relates to a failure in the button functions. Basic Failure modes are as follows: 1) Failure in control top/PTT 2) Bad Connection 3) Defective Switches or pads 4) Defective A/D port in GCAP II Synopsis Button Table Button PTT Volume Control Knob Display Button Channel Select (Frequency) Channel Bank Select To p Side Button (Monitor) Two-Dot Side Button One-Dot Side Button Code 1/ 0-1 2/ 0-255 3/ 0-1 4/ 0-15 67/ 0-2 96/ 0-1 97/ 0-1 98/ 0-1
November 11, 20046881094C12-A 9-14Troubleshooting Charts: Top/Side Button Test 9.9 Top/Side Button Test Use RSS to enable button Replace U501 Replace Housing Assembly Verify connections and control top/PTT flex circuit and repair as necessary Using RSS, verify problem button is enabled for function Levels correct?Verify physical operation of buttons Buttons OK? Button check OK? Buttons Enabled?Using a voltmeter, measure the voltage at U504 pin 3 while depressing the following buttons: - Display - To p Side Button - One-Dot Side Button - Two-Dot Side Button The voltage for each depressed button should be 0 V. The voltage for each button when not depressed should be 2.9 V.Top/Side Button Test Synopsis This chart relates to a failure in reading the buttons: Display, To p Side Button, One-Dot Side Button, or Two-Dot Side Button. Basic failure modes are as follows: 1) Failure in controls flex circuit 2) Bad connection 3) Defective Switch 4) Defective A/D port in GCAP II Verify operation of channel knob using Button Test flowchart No No Ye s Ye s No No Ye s Ye s
6881094C12-ANovember 11, 2004 Troubleshooting Charts: VCO TX/RX Unlock 9-15 9.10 VCO TX/RX Unlock MAEPF-27398-A VCO TX/RX unlock 11.0Vdc or drifting?3V at TP5? Ye s Ye s Ye s Ye s Ye sNo No No No Ye s Ye s Frequency detected? VCO locked? No Ye sNo 5V at TP3? Check VOCON board Check parts around BJT. If OK, replace BJT Check control voltage at TP243Check parts around U1. If OK, replace U1 Aux. line 4 high for TX or low for RX? No FET drain voltage 0V?Check parts around FET. If OK, replace FET No BJT emitter voltage >1.2V?Check parts around U250. If OK, replace U250 Ye sNo Is pin 19 of VCOBIC low for RX and 4.5 for TX?Remove VCO buffer shield (SH302) Check parts around Q302. If OK, replace Q302 Check parts around U2. If OK, replace U2 Remove VCO shield Check parts around U202. If OK, replace U202 Sniff frequency near VCO shield Check if VCO is locked using spectrum analyzer Sniff: Using an inductive field probe as an antenna to measure frequency. Place the probe approximately 1/2 inch away from components to be sniffed. Q210 Q214 Field Effect Transistor (FET) Q211 Q215 Bi-polar Transistor (BJT)
November 11, 20046881094C12-A 9-16Troubleshooting Charts: VOCON TX Audio 9.11 VOCON TX Audio—Page 1 MAEPF-27396-O Inject a 200 mV rms 1.0 kHz tone to the test box Audio In portRepair connections and/or replace flex and microphone Connections OK? Problem with Mic path components? No Problem found. End Replace appropriate component Is FM deviation approx. 3.0 kHz? Connect an RLN4460A audio test box (or equivalent) to the radio side connector Radio has no Transmitter Deviation (VOCON Evaluation) Inspect Microphone and Flex Connector Ye sNo Ye s Ye s No 12 No Probe Voltage at U509, pin 5 Verify Integrity of Mic path up to U509 Is 1 kHz Signal present at approx. 14 mV rms? No Ye s