T830 Series II Base Station Equipment 136-174MHz Service Manual

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C5.14 T836/837 Fault Finding M830-00 C Noisy synth; poor residual FM. VCO phase locked? 5-13V present on control line? Y N Go to B. Correct DC V present on Q1 VCO? Y N Check inductors, biasing resistors & Q1. Loop filter & components around op. amp. (IC750) OK? Y N Replace if faulty. Isolate audio modulation on VCO; still noisy? Y N Trace audio fault. Change trimmer; still noisy? Y N Change Q1; still noisy? N Y Change TCXO; still noisy? N Y Change varactors; still noisy? N Y Replace VCO assembly. Y Synthesiser OK. 30/04/98 Copyright TEL
M830-00 T836/837 Fault Finding C5.15 5.7.4 T836 Drive Amplifier Key exciter & lock synthesiser. 3.5V on Q365 collector? 10.5V on Q370 collector? Y N 10.5V on Q315 N 11V on IC330 N collector? pin 1? Y Y Check continuity of power rails & DC paths to Q365 & Q370. 11V on IC330 pin 8? >2.2V RF at R359/R360? N Check VCO. Check regulators. N Check 9V & 13.8V supplies. Y Y >1.1V RF at R360/R362? Y N Check attenuator pad R359, R360, R362. Check lock det. path back to synth. IC740, IC750, Q345. N Check TP308 >+8V. Y >0.5V RF at Q365 base? N Check C362, C365, C368, Q365, D340, D350, D360, L311. Check temp. shutdown circuit. N Check TP314 6V RF at C379, L360? N Check Q365. Check Q310, Q315 circuitry & IC330. Y >1.5V RF at Q370 base. N Check signal path between Q365 & Q370. Y >6V RF at Q370 collector? Y N Check Q370. Check signal path to output incl. output socket (SK310). Copyright TEL 30/04/98
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M830-00 1 T830 Series II Base Stati
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M830-00 3 About This Manual Scope T
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M830-00 5 Table Of Contents This ma
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M830-00 7 Page Issue Date Page Issu
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M830-00 9 Page Issue Date Page Issu
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M830-00 11 Page Issue Date Page Iss
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M830-00 AI Part A Introduction To S
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M830-00 General A1.1 1 General 1.1
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M830-00 Mechanical A2.1 2 Mechanica
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M830-00 Mechanical A2.3 2.3 Disasse
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M830-00 Component Replacement A3.1
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M830-00 Software History A4.1 4 Sof
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M830-00 BI Part B T835 Receiver Thi
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M830-00 T835 General Information B1
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M830-00 T835 Circuit Operation B2.1
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M830-00 T835 Initial Tuning & Adjus
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M830-00 T835 Functional Testing B4.
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M830-00 T835 Fault Finding B5.1 5 T
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M830-00 T835 Fault Finding B5.3 5.1
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M830-00 T835 Fault Finding B5.11 5.
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M830-00 T835 Fault Finding B5.15 C
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M830-00 T835 PCB Information B6.1.1
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IPN 220-01394-02 M830-00 T835 PCB I
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IPN 220-01394-02 M830-00 T835 PCB I
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IPN 220-01394-02 M830-00 T835 PCB I
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IPN 220-01394-02 M830-00 T835 PCB I
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IPN 220-01394-02 M830-00 T835 PCB I
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M830-00 CI Part C T836 Transmitter
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M830-00 T836/837 General Informatio
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Page 131 and 132: M830-00 T836/837 General Informatio
Page 133 and 134: M830-00 T836/837 Circuit Operation
Page 147 and 148: M830-00 T836/837 Initial Tuning & A
Page 161 and 162: M830-00 T836/837 Functional Testing
Page 169 and 170: M830-00 T836/837 Fault Finding C5.1
Page 181: M830-00 T836/837 Fault Finding C5.1
Page 189 and 190: M830-00 T836/837 PCB Information C6
Page 195 and 196: M830-00 T836 PCB Information C6.2.1
Page 197 and 198: IPN 220-01395-02 M830-00 T836 PCB I
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IPN 220-01390-03 M830-00 T837 PCB I
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M830-00 DI Part D T838 & T839 Power
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M830-00 T838/839 Circuit Operation
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M830-00 T838/839 Initial Adjustment
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M830-00 T838/839 Fault Finding D4.1
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M830-00 T838/839 PCB Information D5
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M830-00 T838 PCB Information D5.2.1
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IPN 220-01404-03 M830-00 T838 PCB I
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IPN 220-01404-03 M830-00 T838 PCB I
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IPN 220-01404-03 M830-00 T838 PCB I
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IPN 220-01404-03 M830-00 T838 PCB I
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M830-00 T839 PCB Information D5.3.1
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IPN 220-01404-03 M830-00 T839 PCB I
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IPN 220-01404-03 M830-00 T839 PCB I
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IPN 220-01404-03 M830-00 T839 PCB I
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IPN 220-01404-03 M830-00 T839 PCB I
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M830-00 EI Part E T830 VCO PCB Info
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M830-00 Introduction E1.1 1 Introdu
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M830-00 Introduction E1.3 Grid Refe
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M830-00 T830 VCO PCB Information E2
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IPN 220-01176-03 M830-00 T830 VCO P
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IPN 220-01176-03 M830-00 T830 VCO P
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IPN 220-01176-03 M830-00 T830 VCO P
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M830-00 FI Part F Installation This
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M830-00 N-Type Connector Assembly F
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M830-00 GI Part G System Configurat
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M830-00 T835 Link Selectable Featur
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M830-00 T835 Link Selectable Featur
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M830-00 T836/837 Optional Features
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M830-00 T836/837 Optional Features
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M830-00 Talk Through Repeater G3.1
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M830-00 Line Controlled Base Withou
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M830-00 DC Line Keying G5.1 5 DC Li
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M830-00 HI Part H T800 Ancillary Eq
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M830-00 T800 Ancillary Equipment H1
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M830-00 I-I Part I Using T830 Serie
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M830-00 Tools Required I1.1 1 Tools
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M830-00 T835/836/837 SII - SI Conve
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&XF330 C611B C610A C515 &XF320 &XF3
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M830-00 T835/836/837 SII - SI Conve
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M830-00 T835/836/837 SII - SI Conve
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M830-00 T838/839 SII - SI Conversio
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M830-00 T838/839 SII - SI Conversio
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C138 C137 C149 C151 M830-00 T838/83
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T830 Series II Base Station Equipment 136-174MHz Service Manual

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