Motorola Gm Series Detailed 6864115b62 A Manual

							Notes For All Schematics and Circuit Boards2-5
5.0 Notes For All Schematics and Circuit Boards
* Component is frequency sensitive. Refer to the Electrical Parts List for value and usage.
1.Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads 
(pF) or microfarads (µF).
2.DC voltages are measured from point indicated to chassis ground using a Motorola DC 
multimeter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in 
series with the voltage probe to prevent circuit loading.
3.Interconnect Tie Point Legend: 
16_8MHz 16.8MHz Reference Frequency
3V3 Regulated 3.3V Supply Voltage for Voice Storage
5V Regulated 5V Supply Voltage for RF Circuitry
5V Regulated 5V Supply Voltage (Control Head)
5V RF Regulated 5V Supply Voltage for RF Circuitry
5V SOURCE 5V Signal to Switch On Control Head
5VD Regulated 5V Supply Voltage for Digital Circuitry
9V3 Regulated 9.3V Supply Voltage
9V3FLT Filtered 9.3V Supply Voltage
A+ 13.2V Supply Voltage
ADDR *P Address Lines
AN Analog Lines to Analog to Digital Converter
ANALOG INPUT 2 External Keypad Matrix Column Signal
ANALOG INPUT 3 External Keypad Matrix Row Signal
BATTERY VOLTAGE Battery Voltage Sense Line
BL A GREEN Back Light Anode Green
BL A RED Back Light Anode Red
BL GREEN Green Back Light Control
BL K GREEN Back Light Cathode Green
BL K RED Back Light Cathode Red
BL KP Green Green Keypad Back Light Control
BL KP RED Red Keypad Back Light Control
BL LCD GREEN Green Display Back Light Control
BL LCD RED Red Display Back Light Control
BL RED Red Back Light Control
BOOT CNTRL Bootstrap Mode Enable Signal
BOOT MODE Boot Mode Select
BOOT PWR ON Control Head Switch On Signal
BOOT SCI RX Serial Communication Interface Receive Line
BOOT SCI TX Serial Communication Interface Transmit Line
BOOT VPP Boot Mode Select
BUS+ Bi-directional Serial Communication Line
BWSELECT Signal to select between the Ceramic Filter Pairs 
						

							2-6MAINTENANCE
CH ACT Channel Activity Indicator Signal (Fast Squelch)
CH KP ID Control Head Keypad ID (Data) Lines
CH REQUEST Control Head Request from Control Head *P
CLK Clock Signal
CNTLVLTG PA Power Control Voltage
CNTR AUDIO Audio Lines of the Controller
COL x Keypad Matrix Column x
CSX Chip Select Line PCIC / FRACN
DATA Data Signal
DC POWER ON Electronic Switching On or Off of the Radios Voltage Regulators
DISCAUDIO Audio Output Signal from the Receiver IC
ECLK Clock (not used)
EE CS EEPROM Chip Select
EMERGENCY CONTROL Emergency Line to switch on the Radios Voltage Regulators
EXP BD REQ Service Request Line from Expansion Board
EXP1 CS Expansion Board Chip Select 1
EXP2 CS Expansion Board Chip Select 2
EXT KP COL External Keypad Matrix Column Signal
EXT KP ROW External Keypad Matrix Row Signal
EXT MIC External (from Accessory Connector) Microphone Input
EXT SWB+ External Switched 13.2V Supply Voltage
F1200 Interrupt Line from ASFIC CMP
FECTRL 1 Control Voltage for Front End Filter 
FECTRL 2 Control Voltage for Front End Attenuator Switch
FLASH CE Flash Chip Select
FLASH OE Flash Output Enable
FLAT RX SND Option Board Audio Output Signal
FLAT TX RTN Flat TX Input from Option Board and Accessory Connector
FLT A+ Filtered 13.2 V Supply Voltage
GP x IN General Purpose Input x
GP x IN ACC y General Purpose Input x from Accessory Connector Pin y
GP x IN OUT ACC y General Purpose Input /Output x from Accessory Connector Pin 
y
GP x OUT General Purpose Output x
GP x OUT ACC y General Purpose Input x from Accessory Connector Pin y
GPIO General Purpose Input Output Lines
HANDSET AUDIO Handset Audio Output
HOOK Hang-up Switch Input
HSIO High Speed Clock In / Data Out
IF First Intermediate Frequency Signal
IGNITION CONTROL Ignition Line to switch on the Radios Voltage Regulators 
						

							Notes For All Schematics and Circuit Boards2-7
IN 5V RF REG Supply Voltage for 5V Regulator in RF Section
INT KP COL Internal Keypad Matrix Column Signal
INT KP ROW Internal Keypad Matrix Row Signal
INT MIC Internal (from Control Head) Microphone Input
INT SWB Internal Switched 13.2V Supply Voltage
INT SWB+ Internal Switched 13.2V Supply Voltage
IRQ Interrupt Request from Control Head
K9V1 9.1V in Transmit Mode
KEYPAD ID Keypad Identification Line
LCD A0 LCD Control / Display Data Select
LCD CS LCD Chip Select
LCD DATA LCD Data Lines
LCD E RD LCD Enable Read
LCD RW WR LCD Read Write Control
LED CNTRL LED Control Lines
LED GREEN Green LED Control
LED RED Red LED Control
LED YELLOW Yellow LED Control
LOCK Lock Detect Signal from Synthesizer
LSIO Low Speed Clock In / Data Out
LVZIF CS LVZIF Chip Select (not used)
MIC Microphone Input
MISO Serial Peripheral Interface Receive Line
MODIN Modulation Signal into the Synthesizer
MOSBIAS 2 PA Bias Voltage for second Stage
MOSBIAS 3 PA Bias Voltage for third Stage
NOISE BLNKR Noise Blanker Enable (Low Band only)
ON OFF CONTROL Service Request Line from Control Head / Manual Switching On
of the Radios Voltage Regulators
ON OFF SENSE (Control Head) On Off Sense Line to Control Head *P
ON OFF SENSE (Controller) Service Request Line from Control Head
OPT CS Option Board Chip Select
OPT PTT PTT from Option Board
PA PWR SET ASFIC Output Voltage to set the Transmitter Power
PA SWB Switches Supply Voltage for PA Current Control Circuitry
PASUPVLTG 13.2 V Supply Voltage of the Transmitter PA
PCIC MOSBIAS 1 PA Bias Voltage for first Stage
PRESC Prescaler Signal from VCO to Synthesizer
PTT IRDEC Microphone PTT Input
PTT IRDECODER Microphone PTT Input
R W Read Write Signal for RAM / Flash 
						

							2-8MAINTENANCE
RAM CS RAM Ship Select
RDY Service Request Line from Option Board
REF CS Reference Chip Select (not used)
RESET Reset Line
ROW x Keypad Matrix Row x
RSSI Received Signal Strength Indicator
RX ADAPT Flat TX Path Disable during Transmitter Key-up
RX AUD RTN Option Board Input / Output of Receiver Audio Path
RX FLAT FILTERED AUDIO Flat or Filtered Audio to Accessory Connector
RXIN RF Signal from Antenna Switch into the Receiver
RXINJ RF Signal from the VCO into the Mixer
SCI RX Serial Communication Interface Receive Line
SCI TX Serial Communication Interface Transmit Line
SPI Serial Peripheral Interface Bus
SPKR- Negative Audio PA Speaker Output
SPKR+ Positive Audio PA Speaker Output
SQ DET Squelch Detect Signal
SYN *P Clock Signal
TEMP SENSE Temperature Sense Line for LCD
TEMPSENSE Temperature Sense Line from PA to *P
TRB TX/RX VCO Switch Signal
TX AUD RTN Option Board Output to Transmit Audio Path
TX AUD SND Microphone Audio to Option Board
TXINJ RF Signal from the VCO into the Transmitter PA
U DRIVER Supply Voltage for PA Driver
U PREDRIVER Supply Voltage for PA Pre-driver
UNSW 5V Permanent 5V Supply
URX SND Filtered Audio Signal to Option Board
VAG 2.5V Reference Voltage for Analog Circuitry
VCOBIAS 1 Switch Signal from Synthesizer
VCOBIAS 2 Switch Signal from Synthesizer
VCOMOD Modulation Signal into VCO
VCTRL VCO Frequency Control Voltage
VDDA Regulated 5V for Digital Circuitry in RF Section
VOLTAGE SENSE Voltage Sense Line from LCD
VOLUME Volume Pot Output
VOX Voice Operated Transmit Level
VPP Boot Mode Select
VS AUDIOSEL Switch Signal to Enable Option Board Audio Output Signal
VS GAINSEL Voice Storage Gain Select Line
VS INT Voice Storage Interrupt Line 
						

							Notes For All Schematics and Circuit Boards2-9
VS MIC Voice Storage Audio Signal into Microphone Path
VS RAC Voice Storage Row Address Clock Signal
VSF Voltage Super Filtered (5V)
VSTBY 5V Supply for *P when the Radio is switched off
4-LAYER CIRCUIT BOARD DETAIL VIEWING
COPPER STEPS IN PROPER LAYER SEQUENCE
LAYER 1 (L1)
LAYER 2 (L2)
LAYER 3 (L3)
LAYER 4 (L4)
INNER LAYERS SIDE 1
SIDE 2 
						

							2-10MAINTENANCE 
						

							Chapter 3
SERVICE AIDS
1.0 Recommended Test Tools
Table 3-1 lists the service aids recommended for working on the radio. While all of these items are 
available from Motorola, most are standard workshop equipment items, and any equivalent item 
capable of the same performance may be substituted for the item listed.
Table 3-1   Service Aids
Motorola Part 
NumberDescription Application
RLN4460_Portable Test SetEnables connection to audio/accessory jack. 
Allows switching for radio testing.
RKN4081_ Programming Cable with 
Internal RIBIncludes radio interface box (RIB) capability.
RLN4853_10 to 20 Pin AdapterConnects RKN4081_ to the radio accessory 
connector.
RKN4083_ Mobile Programming/Test 
CableConnects radio to RIB (RLN4008_).
GTF374_Program CableConnects RIB to Radio microphone input
RLN4008_ Radio Interface Box Enables communications between radio and 
computer’s serial communications adapter.
HLN8027_Mini UHF to BNC AdaptorAdapts radio antenna port to BNC cabling of 
test equipment.
GPN6133_ Power Supply Provides the radio with power when bench 
testing. 
EPN4040_Wall-Mounted Power SupplyUsed to supply power to the RIB (UK).
EPN4041_ Wall-Mounted Power Supply Used to supply power to the RIB (Euro)
8180384J59Housing Eliminator (short)Test Fixture used to bench test the radio pcb 
8180384L95 Housing Eliminator 
(short + top)Test Fixture used to bench test the radio pcb. 
(Radio using pressure pads to retain pcb)
8180384J60Housing Eliminator 
(medium)Test Fixture used to bench test the radio pcb
8180384J61 Housing Eliminator (long) Test Fixture used to bench test the radio pcb
3080369B71Computer Interface CableConnects the RIB to the Computer (25-pin)
3080369B72 Computer Interface Cable Connects the RIB to the Computer 9-pin
(Use for IBM PC AT - other IBM models use 
the B71 cable above)
6686119B01Removal ToolAssists in the removal of radio control head. 
						

							3-2SERVICE AIDS
2.0 Test Equipment
Table 3-2 lists test equipment required to service the radio and other two-way radios.
Table 3-2   Recommended Test Equipment
Motorola Part 
NumberDescription Characteristics
Application
R2600_NTComms System Analyzer 
(non MPT)This monitor will 
substitute for items 
with an asterisk*Frequency/deviation 
meter and signal 
generator for 
widerange 
troubleshooting and 
alignment
R2680_NT Comms System Analyzer 
( MPT1327) to be ordered 
with 
RLN1022_ (H/W) 
RLN1023_ (S/W)This monitor will 
substitute for items 
with an asterisk*.Frequency/deviation 
meter and signal 
generator for 
widerange 
troubleshooting and 
alignment
*R1072_Digital MultimeterAC/DC voltage and 
current 
measurements
*R-1377_ AC Voltmeter 100µV to 300V, 5Hz - 
1MHz, 10Megohm 
input impedanceAudio voltage 
measurements
WADN133Delay Oscilloscope2 Channel 40MHz 
bandwidth, 
5mV/cm - 20 V/cmWavefor m 
measurements
R1440_
0180305F17
0180305F31
0180305F39
RLN4610
T1013_Wattmeter,
Plug-in Elements
Plug-in Elements
Plug-in Elements
Carry case
RF Dummy LoadThruline 50-Ohm,
±5% accuracy
100W, 25 - 60MHz
25W, 100-250MHz
10W, 200-250MHz
Wattmeter and 
6 elementsTransmitter power 
output 
measurements
S1339_RF Millivolt Meter100mV to 3 VRF.
10kHz to 1.2GHzRF level 
measurements
R1011_/220V 220V Power Supply 0 - 40V 0 - 40A Programmable 
						

							 Professional Radio
GM Series
LB1 (29.6 - 36.0MHz)
LB2 (36.0 - 42.0MHz)
LB3 (42.0 - 50.0MHz)
Issue: March 2001 
						

							ii
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reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer 
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products shall not be deemed to grant, either directly or by implication, estoppel or otherwise, any license 
under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive royalty-
free license to use that arises by operation of law in the sale of a product.