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Summary of Contents for Midland 70-1341
- Page 1 SERVICE MANUAL 70-1341/70-1344/70-1441/70-1444 FM TWO-WAY LAND MOBILE RADIO TITAN VHF HIGH BAND (150 — 174 MHz) 12.5/30 WATT 70-134100 4/99...
- Page 2 This manual is designed to facilitate the set-up and service of the Midland Titan VHF mobile transceiver. As necessary, service manual supplements will be published and distributed on the following forms: Manual Addition (MA) ....For supplemental information useful in product service or improvement.
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Page 3: Table Of Contents
TABLE OF CONTENTS Manual Supplement Information................ii Table of Contents ....................iii Acronyms and Abbreviations................vi SECTION 1 GENERAL INFORMATION Description........................1 - 3 Specifications ......................1 - 3 Accessories ......................1 - 6 SECTION 2 PREPARATION Complete Realignment .....................2 - 3 SECTION 3 INSTALLATION Installation.........................3 - 3 SECTION 4 SERVICING Component Replacement..................4 - 3... - Page 5 SECTION 1 — GENERAL INFORMATION SECTION 2 — PREPARATION SECTION 3 — INSTALLATION SECTION 4 — SERVICING SECTION 5 — CIRCUIT DESCRIPTIONS SECTION 6 — DIAGRAMS SECTION 7 — PARTS...
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Page 6: Acronyms And Abbreviations
ACRONYMS AND ABBREVIATIONS Below is a list of common electrical acronyms and abbreviations used in Midland documentation. ANI........ Automatic Number Identification CTCSS......Continuous Tone-Controlled Squelch System DCS (or CDCSS)..Continuous Digital- Controlled Squelch System DTMF......Dual Tone Multi-Frequency EEPROM ...... Electrically Erasable Programmable Read Only Memory MIL........ -
Page 7: General Information
SECTION 1 GENERAL INFORMATION... - Page 8 GENERAL INFORMATION 70-1341/1344/1441/1444 NOTES 1 - 2...
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Page 9: Description
70-1341/1344/1441/1444 DESCRIPTION The 70-1341/1344/1441/1444 Midland Titan Series transceivers are programmable, frequency-synthesized, two- way FM mobile radios that operate in high-band VHF frequency (150 — 174 MHz). They are programmable for up to 120 channels (320 with optional kit). Transmit RF power is adjustable for 25 — 50 W. - Page 10 GENERAL INFORMATION 70-1341/1344/1441/1444 RECEIVER 0.00025 % (-30° C — +60° C) FREQUENCY STABILITY: 0.25 V SENSITIVITY (12 dB SINAD): SELECTIVITY: ±25 kHz: -80 dB ±30 kHz: -80 dB FREQUENCY SEPARATION: 24 MHz min (@ full-rated specifications) ACCEPTABLE RADIO FREQUENCY DISPLACEMENT:...
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Page 11: Accessories
GENERAL INFORMATION 70-1341/1344/1441/1444 ACCESSORIES 70-0038........... Power Cord, 6 m Low Power 70-0074........... 4 m Round Control Cable 70-0076........... 6 m Round Control Cable 70-1309........... Programming PC Interface Cable 70-1470........... PC Programming Software 70-1473........... Programming Kit 70-2183........... 320 Channel Plug-In Module 70-2184........... - Page 12 GENERAL INFORMATION 70-1341/1344/1441/1444 NOTES 1 - 6...
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Page 13: Preparation
SECTION 2 PREPARATION... - Page 14 PREPARATION 70-1341/1344/1441/1444 NOTES 2 - 2...
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Page 15: Complete Realignment
PREPARATION 70-1341/1344/1441/1444 COMPLETE REALIGNMENT Complete realignment is only needed when a component that affects alignment has been replaced. RADIO REPROGRAMMING WITH TEST FREQUENCIES IS REQUIRED. TEST EQUIPMENT REQUIRED TEST INSTRUMENT INSTRUMENT CAPABILITIES Regulated DC Power 13.8 V DC, 15 A... - Page 16 PREPARATION 70-1341/1344/1441/1444 a carrier frequency within ±300 Hz of channel SETUP frequency. 1. Remove the cover from the chassis, starting at PA MODULE ALIGNMENT the back. 2. Connect a resistive 50 RF load and wattmeter The Titan VHF Mobile should be adjusted to have a to Antenna Connector J501.
- Page 17 PREPARATION 70-1341/1344/1441/1444 7. Adjust RV401 for a deviation of ±750 Hz ±10 Hz Quadrature Detector for wide band, or ±375 Hz ± 10 Hz for narrow band. 4. No adjustment for the quadrature is required. 8. Enter DCS code +023.
- Page 18 PREPARATION 70-1341/1344/1441/1444 L702 TX TANK L713 RX TANK X701 L215 L216 L217 REFERENCE OSCILLATOR FIRST IF SQUELCH MODULATION RV402 RV401 Figure 2 —Adjustment Map 2 - 6...
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Page 19: Installation
SECTION 3 INSTALLATION... - Page 20 INSTALLATION 70-1341/1344/1441/1444 NOTES 3 - 2...
- Page 21 9. Plug cable in to P6002. Loosen strain relief nut Mounting Bracket: For Titan Under-Dash units and pull excess cable through hole. Tighten strain (70-1341/1344), a mounting bracket (No. 32 on the relief nut. Exploded View, page 6-14 or 6-15) bolts onto the 10.
- Page 22 Control Heads connection can be made to the ignition hot so that the (70-1341/1441), an external speaker is required when transceiver switches on with ignition, or it can be made using Deluxe Control Heads (70-1344/1444). to battery hot to enable the last-selected-feature of the...
- Page 23 INSTALLATION 70-1341/1344/1441/1444 15 Amp Fuse Red Wires Black Wires Vehicle Battery Ground Post Brown Jumper Wire, used with Internal Speaker Only 70-2357 External Speaker (Required for 70-1344/1444) Figure 3 – 1 — Power and Accessory Plug 3 - 5...
- Page 24 INSTALLATION 70-1341/1344/1441/1444 NOTES 3 - 6...
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Page 25: Servicing
SECTION 4 SERVICING... - Page 26 SERVICING 70-1341/1344/1441/1444 NOTES 4 - 2...
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Page 27: Component Replacement
SERVICING 70-1341/1344/1441/1444 COMPONENT REPLACEMENT STATIC POTENTIALS Many of the transceiver components are susceptible to higher voltages whether they are in or out of a circuit. Avoid static or AC-line potentials when handling components and circuit boards. Prevent damage from electrically "hot" tips that carry AC-line or static potential by using a grounded soldering iron. - Page 28 SERVICING 70-1341/1344/1441/1444 1. Place the solder iron tip directly on the defective component to melt the glue under the component, then solder as shown in Figure 4 - 1. Remove the component with tweezers or longnose pliers. Discard the component CAUTION: Application of too much solder can create solder bridges between PC patterns under the soldered component and around the pad.
- Page 29 SERVICING 70-1341/1344/1441/1444 4. Place component and briefly heat the new solder and pad while holding the component with tweezers. Do not touch the new component with the iron. Only heated solder should touch the component to make a light "tack" bond to it. See Figure 4 - 3.
- Page 30 SERVICING 70-1341/1344/1441/1444 REPLACING COMPONENTS WITH FEED-THROUGH LEADS Exercise extreme care when replacing components with leads that feed through a PC board. The copper plating on both sides of the printed circuit board and inside component lead holes easily separates and tears from the PC board when heated.
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Page 31: Troubleshooting Charts
SERVICING 70-1341/1344/1441/1444 TROUBLESHOOTING CHARTS Transmit transmit, DONE and receive receive or START OK, but no channel scan? display? Check EEPROM Module (IC902). If Transmit Go to Error Code Transmit and problem persists, and receive OK, Error Code Displayed receive OK, but... - Page 32 SERVICING 70-1341/1344/1441/1444 No Backup Error Code 7 Data: START DONE Check backup Displayed? power supply Error Code Error Code Unplug and check Error Code 1 Error Code 3 2 or 4 8 or 9 programmer or Displayed? Displayed? Displayed? Displayed?
- Page 33 SERVICING 70-1341/1344/1441/1444 No output Go to Logic Transmitter power, or low Troubleshooting START off-frequency? output power? Chart, page 4 - 12 D501, D502, D503, Go to Modulator Suspect D501, No transmit D504 and D502 Troubleshooting D502, D503, audio? biased in TX...
- Page 34 SERVICING 70-1341/1344/1441/1444 No signal, or Poor No audio? Suspect Q201 START weak signal? sensitivity? Go to D501 Audio present thru D505 Suspect D501 at IC202 pin 9? unbiased in RX thru D505 mode? (Next page) Audio C549, C550 present at...
- Page 35 SERVICING 70-1341/1344/1441/1444 Signal No squelch? RV402 OK? Suspect RV402 distorted? IC408 pin 7 goes DONE Low to High Suspect IC202 IC202 OK? Suspect IC408 adjusting squelch? IC402 pin 6 goes Check IC401 Low to High Suspect IC402 Suspect IC405 and IC404...
- Page 36 SERVICING 70-1341/1344/1441/1444 transmit, Go to Transmitter receive, START Control Head off frequency? or channel Troubleshooting display? Chart, page 4 - 13 Try to adjust frequency using Suspect IC901, at IC901 programming D902 or Q901 pin 73? software Transmitter still off-...
- Page 37 SERVICING 70-1341/1344/1441/1444 Suspect PT301, START DONE Q302 or Q303 Display Display Are some Are all responds when blank or lights on? lights on? a key is incorrect? pressed? Suspect D302, 5 V at S301, S302, IC302 S303 or S304 pin 71?
- Page 38 SERVICING 70-1341/1344/1441/1444 START DONE Audio 12.8 MHz Suspect Suspect at J901 at X701? microphone X701 pin 16? Audio at Suspect Suspect IC702 OK? IC402 pin 1? IC702 IC402 Audio at Suspect Suspect IC701 OK? IC401 pins 4 IC401 IC701 and 6?
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Page 39: Circuit Description
SECTION 5 CIRCUIT DESCRIPTION... -
Page 40: Description
CIRCUIT DESCRIPTION 70-1341/1344/1441/1444 NOTES 5 - 2... - Page 41 CIRCUIT DESCRIPTION 70-1341/1344/1441/1444 CIRCUIT DESCRIPTION The Titan radio is made up of four major sections: the RF Section, the PA Section, the Logic Section and the Display section. Normally the loop response is slowed enough by the active RF SECTION filter to block 5.0 kHz reference noise and prevent loop...
- Page 42 CIRCUIT DESCRIPTION 70-1341/1344/1441/1444 RV402. Level detector output is supplied through NSQ, the First IF interconnect, to microcomputer input port P41 so that the microcomputer can take appropriate action. Mixer output is applied to Q203, which drives L215. L215 tunes to match the input impedance of the...
- Page 43 CIRCUIT DESCRIPTION 70-1341/1344/1441/1444 Q507. The power control reduces the output power -3 DC Power and Reset dB whenever PA section temperature becomes excessive. 5V DC power to all logic circuitry in the logic section is supplied from switched 13.6V and is regulated by IC905.
- Page 44 CIRCUIT DESCRIPTION 70-1341/1344/1441/1444 Table 5-1 — IC901 Pinouts Pin No. Pin Name Function Label Logic & Function P-ON RESET +B SW DTONE SW RSSI Low = TX HANG UP Low = Hang Up CH DET CH CONT SCLK2 CH CLK...
- Page 45 CIRCUIT DESCRIPTION 70-1341/1344/1441/1444 Table 5-1 — IC901 Pinouts (Continued) Pin No. Pin Name Function Label Logic & Function CH3/SW3 CH2/SW2 CH1/SW2 CH0/SW2 LPSW CONT — — — Not used CALL TXDL2 TX LPSW TX PLCL TX STB MOD LSB ...
- Page 46 CIRCUIT DESCRIPTION 70-1341/1344/1441/1444 NOTES 5 - 8...
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Page 59: Parts
SECTION 7 PARTS... - Page 60 PARTS 70-1341/1344/1441/1444 NOTES 7 - 2...
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Page 61: Parts List
PARTS 70-1341/1344/1441/1444 PARTS LIST REF NO. DESCRIPTION PART NO, RF AND IF MECHANICAL PARTS CAPACITORS STD FRONT CASE ASSY 70-010426 KNOB(R) 70-110140 C201 CERAMIC, 50 V, 27 pF ± 5% 70-138746 KNOB(L) 70-110141 C202 CERAMIC, 50 V, 18 pF ±10%... - Page 62 PARTS 70-1341/1344/1441/1444 RESISTORS INTEGRATED CIRCUITS R201 METAL, 1/32 W, 0 OHM ± 5% 70-144562 IC202 TA31136FN 70-076853 R202 METAL, 1/32W 10 kOHM ± 5% 70-144344 IC203 TDA1519A 70-076854 R203 METAL, 1/32 W, 3.3 kOHM ±5% 70-144347 IC204 HA178L05UA 70-076869 R204 METAL, 1/10 W, 47 OHM ±...
- Page 63 PARTS 70-1341/1344/1441/1444 REF NO. DESCRIPTION PART NO, REF NO. DESCRIPTION PART NO, RESISTORS MISCELLANEOUS R301 METAL, 1/10 W, 1 kOHM ± 5% 70-144353 J302 CONNECTOR 285D-9880J101 70-159858 R302 METAL, 1/10 W, 1 kOHM ± 5% 70-144353 LCD301 LCD, LCD9819JH 70-202094 R303 METAL, 1/10 W, 1 kOHM ±...
- Page 64 PARTS 70-1341/1344/1441/1444 REF NO. DESCRIPTION PART NO, REF NO. DESCRIPTION PART NO, RESISTORS RESISTORS (CONTINUED) R401 METAL, 1/32 W, 39 kOHM ±5% 70-144356 R483 METAL, 1/32W 10 kOHM ± 5% 70-144344 R402 METAL, 1/32 W, 2.2 kOHM ± 5% 70-144359 R484 METAL, 1/10 W, 47 kOHM ±...
- Page 65 PARTS 70-1341/1344/1441/1444 REF NO. DESCRIPTION PART NO, REF NO. DESCRIPTION PART NO, CAPACITORS (CONTINUED) COILS AND INDUCTORS C516 CERAMIC, 50 V, 120 pF±10% 70-138303 L502 6-3-3TP 70-090751 C517 CERAMIC, 50 V, 15 pF ± 5% 70-138205 L503 COIL, 6-3-4TP 70-090748 C520 CERAMIC, 50 V, 22 pF ±...
- Page 66 PARTS 70-1341/1344/1441/1444 REF NO. DESCRIPTION PART NO, REF NO. DESCRIPTION PART NO, CAPACITORS (CONTINUED) RESISTORS (CONTINUED) C733 CERAMIC, 50 V, 4 pF ±10% 70-138433 R727 METAL, 1/10 W, 22 OHM ± 5% 70-144657 C734 CERAMIC, 50 V, 10 pF ±10%...
- Page 67 PARTS 70-1341/1344/1441/1444 REF NO. DESCRIPTION PART NO, REF NO. DESCRIPTION PART NO, TRANSISTORS CAPACITORS (CONTINUED) Q701 2SA1121C(SC) 70-080159 C953 CERAMIC, 25 V, 0.1 uF ±10% 70-138598 Q702 2SC2462C (LC) 70-080160 C954 CERAMIC, 25 V, 10000 pF ±10% 70-138625 Q703 2SA1121C(SC)
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Page 68: Replacement Parts Ordering
To speed delivery and avoid errors, have the following information ready when ordering replacement parts: 1. Identification of the part. The best identification is the Midland Part Number. Otherwise, you will need to know the Model and Serial numbers of equipment in which the part is used, with a Part Description and Schematic reference designator.