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LBI-38378C
Mobile Communications
M-PA™
VHF
PORTABLE FM RADIO
TABLE OF CONTENTS
REAR COVER ASSEMBLY . . . . . . . . . . . . LBI-38597
FRONT COVER ASSEMBLY (EARLIER)
AND CONTROL BOARD . . . . . . . . . . . . . LBI-38384
FRONT COVER ASSEMBLY (LATER)
LESS CONTROL BOARD . . . . . . . . . . . . . LBI-38834
CONTROL BOARD (LATER) . . . . . . . . . . . LBI-38828
VHF SERVICE SECTION . . . . . . . . . . . . . LBI-38385
Maintenance Manual
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LBI-38378 TABLE OF CONTENTS Page SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 OPTIONS AND ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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LBI-38378 SPECIFICATIONS* GENERAL Frequency Bands 136 - 150.8 MHz (FCC Type Acceptance Number) 146 - 162 MHz (AXATR-182-B5) 157 - 174 MHz (AXATR-182-C5) DOC Number TR-182-D2 Frequency Stability 5.0 ppm Channel Capacity Select Model 16 Scan Model 192 System Model 192 Maximum Frequency Separation full bandsplit Channel Spacing 30 kHz Operating Temperature Range -30°C to +60°C Maximum Relative Humidity 90% at 55°C Battery Voltage 7.5 Vdc (nominal) Dimensions (H x W x D) less battery, knobs
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LBI-38378 OPTIONS AND ACCESSORIES Radios, Antennas, Batteries Carrying Accessories Audio Accessories Chargers 4
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LBI-38378 maximum number of positions to less than sixteen INTRODUCTION (16). It is normally factory installed for fifteen (15) positions. The M-PA radio is a high quality microprocessor con- trolled synthesized portable FM radio. M-PA operation is • Volume Control Knob - This rotatable control highlighted by the radio’s programming versatility. This al- provides quick and easy adjustments to the volume lows tailored operation of the portable radio to meet the level. Minimum volume levels can
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LBI-38378 •Programmable Multi-Tone Channel Guard • Power-Up Self-Test - At power-up the radio (CTCSS) - Channel Guard tone frequencies within automatically performs a diagnostic test on itself and the range of 67 Hz to 210.7 Hz, including all of the reports any found errors via the LCD. standard EIA frequencies, can be programmed for • Programmable via the Universal Device Connector encoded/decoded operation. (UDC) - The entire operation of the radio can be field • Programmable Multi-Code Digit
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LBI-38378 Figure 2 - Scan Model Figure 1 - System Model Figure 3 - Select Model Figure 4 - Side View (All Models) 7
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LBI-38378 nal antenna can be mounted to the unit via the UDC. When REAR COVER ASSEMBLY an antenna is connected to the UDC, the antenna on the top The Rear Cover Assembly houses the RF Board in the of the radio is disabled. die-cast aluminum case. The complete assembly consists of the VHF RF Board, aluminum case, top antenna jack, side BATTERY PACKS (UDC) antenna jack and various hardware. The battery pack connects to the bottom of the unit and The RF Board’s circuitry includes the transmitter
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LBI-38378 pack in need of a charge will cause the low battery "BAT" FEATURES PROGRAMMABLE ON A PER status flag on the radio to turn on. This flag will turn on CHANNEL BASIS when the battery pack’s voltage drops below approximately • Transmit and Receive Frequencies 6.8 Volts. The low battery alert tone will also be heard when the battery pack needs charging. •8-Character Alphanumeric Display (Channel Designator) RECHARGEABLE BATTERY PACK DISPOSAL • Tone or Digital Channel Guard Encode/Decode • T
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LBI-38378 TABLE 2 - UDC PIN FUNCTIONS PIN NAME INPUT OR USE OUTPUT 1 GROUND ------- Case Ground 3 UDC RX AUDIO Output Test Point For Speaker Audio 4 SWBATT Output Switched Accessory Power 5 EXT PTT Input External Microphone PTT Input 6 TX DATA Input For Programming 7 RX DATA Output For Programming 8SPARE 9 UDC VOLT ------- Option/Accessory Sense Pin 10 T/R Output Low = Transmit, High = Receive 11 UDC MUTE Output Low = Audio Muted 12 EXT MIC HI Input External Microphone Audio Input 13 EXT EMER In
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LBI-38378 • Two individual Type 99 Tone Group Sets INTRINSICALLY SAFE USAGE • Control Knob selects Channels, Modes or Channel Selected portable radios with appropriate factory in- Guard* stalled F4 Options are certified as Intrinsically Safe by the • Menu Selections* Factory Mutual Research Corporation. Intrinsically Safe ap- proval includes Class I, II, III, Division 1 hazardous loca- • Home Mode or Home Channel (depending on tions in the presence of Groups C, D, E, F and G Control Knob progr
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LBI-38378 PANC1B Antenna, 136 - 151 MHz, Helical PREVENTIVE MAINTENANCE (19B234804P1) Antenna PANC1C Antenna, 146 - 162 MHz, Helical (19B234804P2) The antenna and antenna contact should be kept clean and free from dirt or corrosion. If the antenna contact should PANC1D Antenna, 157 - 174 MHz, Helical become dirty or corroded, communication range could be (19B234804P3) reduced. PAHC1C Belt Clip Battery Packs PAHC1D Swivel Mount with Belt Loop Insure the battery packs are properly maintained.
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LBI-38378 DISASSEMBLY / REASSEMBLY TABLE 3 - TORQUE SPECIFICATIONS In the event internal service is required, disassemble the LOCATION LB-IN. radio in accordance with the following outlined steps. See Figures 6 - 10. Rear/Front Cover Assembly Screws 5.0 Reassemble the unit by following the steps in reverse order. Observe screw lengths and do not over tighten the Rear Cover Assembly screws when reassembling the unit. Torque specifications Antenna Insert 10.0 are listed in Table 3. UDC RF Conne
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LBI-38378 the chip component side of the board that secure it to the RF Board Access casting. Holes are located in the RF Board shield for alignment Reassemble the unit in reverse order. Observe screw of the Reference Oscillator (U3), Modulation Balance pot lengths. (R18), VCO Modulation pot (R19), 2nd Local Oscillator Adjustment (T1), and the Quadrature Detector Adjustment Control Board Access (T2). To align these items, shield removal is not necessary. If removal of the RF Board from the ca
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LBI-38378 TION: Installation of screws that are longer than the origi- UDC Flex/UDC/Monitor Button/PTT Switch nals may damage the LCD Board, flex circuits or the Assembly Removal threads. If UDC Flex/UDC/Monitor Button/PTT Switch assem- To remove the Control Board, remove the Torx screw bly removal is necessary, first un-solder the microphone. (E) in the lower left-hand corner that supplies battery power With a spanner wrench, remove the UDC securing screw to the board. An earlier Front Cover
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LBI-38378 BLOCK DIAGRAM Figure 11 - Rear Cover Assembly Block Diagram 16
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BLOCK DIAGRAM LBI-38378 Figure 12 - Front Cover Assembly (Earlier) And Control Board Block Diagram 17
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LBI-38378 Later Front Cover Assembly Keypad Flex Removal Speaker Flex Removal To remove the Keypad Flex, first remove the UDC In order to replace the Speaker Flex, it must be un-sol- Flex/UDC/Monitor Button/PTT Switch assembly as pre- dered from the speaker and the Battery Plate. viously stated. Next remove the screw securing the emer- gency switch support (G) then remove the support. Remove LCD Board Access the knobs using the hex driver. With a spanner wrench, re- move the nuts securing the v
