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After Sales Technical Documentation

NMP Part No. 0275180

Original, 12/95

THA–4S

TROUBLE SHOOTING

GUIDE

Summary of content (13 pages)

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After Sales Technical Documentation THA–4S TROUBLE SHOOTING GUIDE Original, 12/95 NMP Part No.
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After Sales THA–4S Troubleshooting Guide Technical Documentation AMENDMENT RECORD SHEET Amendment Number Page 2 Date Inserted By Comments Original, 12/95
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After Sales Technical Documentation THA–4S Troubleshooting Guide TROUBLESHOOTING GUIDE CONTENTS Page No Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Logic Faults . . . . . . . . . . . . . . . . . .
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After Sales THA–4S Troubleshooting Guide Technical Documentation Introduction The following pages in this guide contain useful flow charts designed to assist with system faultfinding. General Faults START Off Current consumption > 0.5mA N DC Fault Y Will turn into local mode N Logic fault Y N Receiver O.K Receiver fault Y Transmitter O.
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After Sales THA–4S Troubleshooting Guide Technical Documentation DC Fault DC fault Power consumption greater than 60ouA when phone is off Check voltage across R131 or R162 < 2.
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After Sales THA–4S Troubleshooting Guide Technical Documentation Logic Fault Logic fault Power drops off, does not assume local mode Check the following: Check clock signal of D100/ pin 7 4.85Vpp 4.8MHz N Y Check VL1 N101/pin 20 VL2 N101/pin 3 4.85 V N –Soldering of N101 –Vbat N101/pin 1 –DETIN N101/pin 12>1.23V If OK change N101 Y Check the following: –Soldering of B102 –Soldering of D101 –DC voltage of B102 If OK change B102 is XRES 0V in N101/pin 8 N Check MCU clock D101/pin 69 4.85Vpp/4.
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After Sales THA–4S Troubleshooting Guide Technical Documentation Receiver Fault (1) Receiver fault Channel 380 RX level –60dBm PROBE 10:1 10 Mohm/14pF Simplex sens TX (off) OK Noise or AF signal at X101 pin 4 XEAR N N Is VRX (V221c) 4.85V Is Vref (N101/pin 2) 4.
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After Sales THA–4S Troubleshooting Guide Technical Documentation Receiver Fault (2) B Check RF level at G200/out 1.5Vpp/14.4 MHz N N Injection level at C265 –32dBm 14.4 MHz Y Y Check V225/c Check G200 Y A 1.8 Vdc N Check R226, R303, R299, V225, R202, C329, C326, V200 Check R202, R326, C329, V200 N Check N201 pin4 = 1.9 Vdc Y Check RF level at C220 –66 dBm 86.85 MHz N Check RX level –30dBm L204, C215, N201, L205 C225 Y Check Y V202, R203, R204 Check RF level at C210 –55dBm 86.
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After Sales THA–4S Troubleshooting Guide Technical Documentation Transmitter Fault (1) Transmitter fault Channel 380 RX level –60dBm PROBE 10:1 10 Mohm/14pF Tx freq. Y Output power N 836.4000MHz Check VCTCXO, G200, D101/pin 64 (PWM) C318, R296 Y N TSYN = 4.85Vdc N V222/pin 5 4.
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After Sales THA–4S Troubleshooting Guide Technical Documentation Transmitter Fault (2) A Check Check R280, R224, R237 E D C B Check V216, R279, R280 V215 R276, R277 V203 Y Change of VCONT possible Check N V216, V215, R279, R281, R282 Y RF Level V212/c –39dBm 836.4MHz N N Check V212/c= 4.2Vdc R262 Power level 2 Bit 1>4Vdc Bit2>4Vdc Check N R266, R267, D101, N203 Y Y Check R297, L209, C293, R265, R264 Y Power level 7 Bit 1>4Vdc Bit2<1Vdc N Y Check RF Level V213/b –40dBm 836.
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After Sales THA–4S Troubleshooting Guide Technical Documentation Display / Keyboard Fault Display/Keyboard fault Display 0k N Change display module Check Y –soldering X400 –X400/pin5 Vbat Y Display OK? N –X400/pin12 VL2 –X400/pin 16 –V –2.1V –X400/pin 14 GND –X400/pin7 LCD_Clock 280kHz Y Check Lights OK? N D101/pin 44 4.
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After Sales THA–4S Troubleshooting Guide Technical Documentation Call Setup Fault Call Setup fault Does the phone assume SERV mode? N Subscriber data OK? N If programming is not possible check –MBUS circuit (V121) –D102 control line soldering Y Y check operation of: –ST signal –SAT/DSAT signal –Transmitter –Synthesiser –VCO if all OK change D100 check RSSI operating? N –D101/pin 54 A/D con –N201/pin 12 for RSSI Y check Data detection of D100/pin 27? N –D100/pin 27 for data signal –D201/pin
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After Sales THA–4S Troubleshooting Guide Technical Documentation Earphone /Modulation Level Fault –Voice modulation 2,9kHz div. @ 1kHz –Volume 3 ( in NANTIC vil. step 8.) –Compandor on –XMIC line 65mV/!kHz equals 2,9kHz div.