SD-160 Series Data Radio

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3. Unscrew the two mounting screws locatedon shield can for PA module.4. Replace the RF board assembly.Fig 5.5. Replacing RF board assemblyREMOVING & REPLACING THE DIGITAL BOARD1. Unfasten the two hexagonal screws fromDB-15 connector.2. Loosen the mounting screw located onthe left side of digital board3. Remove two wires between powerconnector and digital board.Fig 5.6. Removing screws and wires from digital B’D36
4. Pull the digital board out of bottom cover.5. Replace the digital board assembly.Fig 5.7. Replacing digital board assembly37
Page 2: TABLE OF CONTENTS1. INTRODUCTION...
Page 5 and 6: 2. TECHNICAL SPECIFICATIONSGENERALV
Page 7: RECEIVERVHFUHFModel Series : SD-161
Page 10 and 11: Scan DeleteTo temporarily delete a
Page 12 and 13: of DB-15 connector, respectively. I
Page 14 and 15: RF BoardPre-SelectorAFRSSIIF ICTA31
Page 16 and 17: Two-Tone Squelch(SQ) SystemThe radi
Page 18 and 19: 1. Channel Change 0x64 0x?? :Curren
Page 20 and 21: STATUS DESCRIPTION LED COLOR AUDIBL
Page 22 and 23: Channel Space DTE Baud Rate Modem B
Page 24 and 25: adjusted (amplified) by IC416-B. Th
Page 26 and 27: CHANNEL SELECTOROne of 16 channels
Page 28 and 29: DC TO DC CONVERTERThe DC to DC conv
Page 30 and 31: to the base of Q601 serving as an R
Page 32 and 33: 4.5. ACC-514 (FFSK MODEM CIRCUITS)M
Page 34 and 35: 5. MAINTENANCE AND REPAIRGENERALAny
Page 38 and 39: 6. COMPONENT REPLACEMENTSurface Mou
Page 40 and 41: 7. ALIGNMENT PROCEDUREThe UHF/VHF T
Page 42 and 43: 7.2. TRANSMITTERConnect the unit to
Page 44 and 45: 11. Adjust the RF signal to the des
Page 46 and 47: DB9-Modular cable15 - 15 ConnectorS
Page 48 and 49: 8 Serial data IN(RXD)9 Speaker filt
Page 50 and 51: 8.4. Option board pin-out chart8.4.
Page 52 and 53: 8.5. Wiring DiagramCON401PIN# DESCR
Page 54 and 55: STARTVERY LOWORNO 12DB SINADNOISE A
Page 56 and 57: STARTVISUALCHECK OFTHE BOARDOK?YESN
Page 58 and 59: LOW OR NO POWERAT INPUT TO P.A.RF P
Page 60 and 61: 10. VOLTAGE CHARTTRANSISTORS OF CON
Page 62 and 63: ICS OF DIGITAL BOARDRECEIVE MODEPIN
Page 64 and 65: MCU (IC401)RECEIVE MODEPIN # Voltag
Page 66 and 67: PART NO. NAME & DESCRIPTION REF PAR
Page 72 and 73: 11.2. PARTS LIST FOR SD-164PART NO.
Page 80 and 81: BASE DIAGRAMMANUFACTURER’SPART NU
Page 82 and 83: BASE DIAGRAMMANUFACTURER’SPART NU
Page 88 and 89:
RF B’D Schematic for SD-171 (Rese
Page 93:
14. CIRCUIT B’D DETAILSThis chapt
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SD-160 Series Data Radio

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