Motorola Gm1200e Detailled 68p64115b15 Manual

							 
Introduction
Introduction1-1
 
1.0Introduction  
This chapter outlines the scope and use of the detailed service manual and provides an overview of 
the warranty and service support. 
2.0Scope of Manual 
This manual is intended for use by experienced technicians familiar with similar types of equipment. 
It contains level 3 service information required for the equipment described and is current as of the 
printing date. Changes which occur after the printing date maybe incorporated by a complete 
Detailed Service Manual revision or alternatively as additions, for example, to Band Specific 
information. 
3.0How to Use This Manual 
The detailed service manual contain an introductory chapter giving information on warranty and 
support. Chapter 2 contains level 3 service information for the control head . Chapter 3 details level 
3 service information for the radios in band specific sub-chapters each containing theory of 
operation and schematics/parts lists. Refer to the Table of Contents for a general overview of the 
manual. 
4.0Warranty and Service Support 
Motorola offers long term support for its products. This support includes full exchange and/or repair 
of the product during the warranty period, and service/ repair or spare parts support out of warranty. 
Any return-for-exchange or return-for-repair by an authorised Motorola Dealer must be 
accompanied by a Warranty Claim Form. Warranty Claim Forms are obtained by contacting an 
Authorised Motorola Dealer. 
4.1Warranty Period 
The terms and conditions of warranty are defined fully in the Motorola Dealer or Distributor or 
Reseller contract. These conditions may change from time to time and the following notes are for 
guidance purposes only.
In instances where the product is covered under a return for replacement or return for repair 
warranty, a check of the product should be performed prior to shipping the unit back to Motorola. To 
ensure the product has been correctly programmed or has not been subjected to damage outside 
the terms of the warranty.
Prior to shipping any radios back to the appropriate Motorola warranty depot, please contact 
Customer Services. All returns must be accompanied by a Warranty Claim Form, available from 
your Customer Services representative. Products should be shipped back in the original packaging, 
or correctly packaged to ensure no damage occurs in transit. 
1 
						

							 
Warranty and Service Support
1-2Introduction
 
4.2After Warranty Period 
After Warranty period, Motorola continues to support products in two ways. 
Firstly, Motorolas Radio Parts and Service Group (RPSG) offer a repair service to both end users 
and dealers at competitive prices. 
Secondly, RPSG supplies individual parts and modules that can be purchased by dealers who are 
technically capable of performing fault analysis and repair. 
4.3Piece Parts 
Some replacement parts, spare parts, and/or product information can be ordered directly. If a 
complete Motorola part number is assigned to the part, it is available from Motorola Radio Parts and 
Service Group (RPSG). If a generic part is listed or only a part description is listed, the part is not 
normally available from Motorola. If a parts list is not included, this generally means that no user-
serviceable parts are available for that kit or assembly.
All orders for parts/information should include the complete Motorola identification number. All part 
orders should be directed to your local RPSG office.  
Head Office  
Motorola G.m.b.H.
European Parts Department
65232 Taunusstein
Germany 
4.4Technical Support 
Motorola Product Services is available to assist the dealer/distributors in resolving any malfunctions 
which may be encountered. Initial contact should be by telephone whenever possible. When 
contacting Motorola Technical Support, be prepared with the product model number and the unit’s 
serial number.  
4.5Associated Documentation 
Publication NumberDescription 
ENLN4051AGM1200E Product Manual (with Level 1/2 repair information)
ENLN4052AGM1200E Produkthandbuch
ENLN4053AManuel de Produit GM1200E
68P64117B01Shared Mobile Radio Systems (SMR) using MPT1327 
A System Integrators Cookbook 
68P02900X57-AData Application Notes for 1200 Series Radios 
						

							 
Control Head - Level 3 Information2-i 
Chapter 2 
Control Head - Level 3 Information 
Table of Contents 
Table of Contents 
Chapter 
2.1 Introduction/Theory of Operation
2.2 PCB/Schematic Diagram and Parts List 
						

							 
Table of Contents
2-iiControl Head - Level 3 Information 
						

							 
Introduction/Theory of Operation2.1-i 
Chapter 2.1 
Introduction/Theory of Operation 
Table of Contents 
Table of Contents 
Paragraph Page 
1.0 Overview  
.....................................................................................................  1  
2.0 Exploded View  Diagram  
............................................................................  2  
3.0 Theory of Operation  
..................................................................................  2
3.1 General ........................................................................................................  2
3.2 Power Supplies ............................................................................................  3
3.3 Voltage Regulator Circuit .............................................................................  3
3.4 Power On / Off .............................................................................................  3
3.5 Microprocessor Circuit .................................................................................  4
3.6 Serial Peripheral Interface (SPI) ..................................................................  4
3.7 Keypad Keys................................................................................................  5
3.8 Status LED and Back Light Circuit...............................................................  5
3.9 Liquid Crystal Display (LCD)........................................................................  5
3.10 Microphone Connector ................................................................................  6
3.11 Electrostatic Transient Protection ................................................................  6 
						

							 
Table of Contents
2.1-iiIntroduction/Theory of Operation 
						

							 
Overview
Introduction/Theory of Operation2.1-1
 
1.0 Overview  
128 Channel, Keypad/Display Radio Control Head (Model K6) 
The features of the radio control head are as follows: 
n n 
On/Off Button 
n n 
Rocker type Volume Up/Down Control 
n n 
Volume Level Indicators (RSSI) 
n n 
Backlit Liquid Crystal Display (LCD) with display icons to show call progress and status 
n n 
Up/Down scrolling keys for the display 
n n 
Left/Right scrolling keys for the display 
n n 
3 x 4 CCITT Keypad  
n n 
Microphone Socket 
n n 
Clear/Edit Button 
n n 
Menu Button 
n n 
Status Button 
n n 
Personality Button 
n n 
Data Button 
n n 
Call In Absence Button 
n n 
Base Call Button 
n n 
External Alarm Button 
n n 
3 LED’s (Red, Yellow and Green)
2.1
2 13
4
5
86
79
DS
0
MENU
C
P 
						

							 
Exploded View  Diagram
2.1-2Introduction/Theory of Operation
 
2.0 Exploded View  Diagram
3.0 Theory of Operation 
3.1 General 
The control head contains the microphone connector, several buttons to operate the radio, several 
indicator Light Emitting Diodes (LED) to inform the user about the radio status and a Liquid Crystal 
Display (LCD) with 19 pre - defined symbols, 11 bars and a 24x120 dot matrix for graphical or alpha 
- numerical information e.g. channel number, select code, call address name. To control the LEDs 
and the LCD, and to communicate with the host radio, the control head uses the Motorola 
68HC11E9 or 68HC11E20 (dependent on the used character set) microprocessor.
Gasket
3286006B01
PCB
8486015B05
not field replaceable
Keypad
7586002B03
LCD module
7286003B02
Gasket, LCD
3286005B01 Housing back
1586001B01
Housing, front
Control head
1586000B01 Frame, LCD
0786004B01
LAPD0008-2 Control Head Kit  GCN6110A 
						

							 
Theory of Operation
Introduction/Theory of Operation2.1-3
 
3.2 Power Supplies 
The power supply to the control head is taken from the host radio FLT A+ voltage via connector 
J0901 pin 2. The voltage FLT A+ is at battery level and is used for the LEDs, the back light, to power 
up the radio via On / Off button and to supply the voltage regulator circuit. The regulator circuit 
provides the stabilized +5 volt which is used for the microprocessor circuit, the display, the display 
driver and the keypad buttons. The voltage +5V USW also provided by the regulator circuit is used to 
buffer the internal RAM of the microprocessor (U0901). The regulated +5V taken from the host radio 
via connector J0901 pin 10 (line +5V SOURCE) is only used to switch on or off the voltage regulator 
in the control head. 
3.3 Voltage Regulator Circuit 
Voltage regulator U0891 provides 5V for the control head. The supply voltage FLT A+ for the voltage 
regulator is fed via parallel resistors R0893/4 and dual diode D0891 to pin 8 of U0891. The +5 volt 
output is switched on and off by the host radio’s 5 volt source via line +5V SOURCE and control 
transistor Q0891. When the host radio is switched off the voltage on line +5V SOURCE is at ground 
level and switches off transistor Q0891. Pull up resistor R0892 pulls input SHUTDOWN (pin 3) of the 
voltage regulator U0891 to FLT A+ level and switches off the output of U0891 (pin 1). When the host 
radio is switched on the voltage on line +5V SOURCE of about +5 volts switches on transistor 
Q0891 which in turn pulls input SHUTDOWN (pin 3) to ground and switches on the output of U0891. 
Input and output capacitors (C0892 / C0893 and C0895 - C0896) are used to reduce high frequency 
noise and provide proper operation during battery transients. Diode D0891 prevents discharge of 
C0893 by negative spikes on the FLT A+ voltage. This regulator provides a reset output (pin 5) that 
goes to 0 volts if the regulator output goes out of regulation. This is used to reset the microprocessor 
(U0901) and the display driver (U0902) to prevent improper operation.
The voltage +5V USW derived from voltage FLT A+ is stabilized using resistor R0896 and diode 
VR0891 This voltage is used to buffer the microprocessor’s internal RAM. C0898 allows the battery 
voltage to be disconnected for a couple of seconds without losing RAM parameters. Diode D0892 
prevents radio circuitry from discharging this capacitor. The +5V at the second anode of D0892 
speeds up charging of C0898 when the host radio is turned on by a high level at the ignition input 
while the supply voltage is applied to the radio. This prevents the microprocessor from accidently 
entering bootstrap mode. 
3.4 Power On / Off 
The On/Off button when pressed switches the radio’s voltage regulators on by pulling ON OFF 
CONTROL to high via D0931 and connects the base of Q0932 to FLT A+. This transistor pulls the 
line ANALOG 3 low to inform the  
m 
P that the On/Off button is pressed. If the radio is switched off, the   
m 
P will switch it on and vice versa. If the On/Off button is pressed and held while the radio is on, the 
software detects a low state on line ANALOG 3 and switches the radio off. If the radio is switched on 
either manually or automatically its +5V source switches on the control head voltage regulator 
U0891 via line +5 SOURCE and transistor Q0891 and the control head microprocessor starts 
execution. 
						

							 
Theory of Operation
2.1-4Introduction/Theory of Operation
 
3.5 Microprocessor Circuit 
The control head uses the Motorola 68HC11E9 or 68HC11E20 (dependent on the used character 
set) microprocessor ( 
m 
P) (U0901) to control the LEDs, the LCD and to communicate with the host 
radio. RAM and ROM are contained within the microprocessor itself.
The clock generator for the microprocessor can use two different configurations:
1. The oscillator inside the microprocessor (U0901) along with a 4 MHz ceramic resonator (Y0922) 
and R0920 generate the clock.
2. The oscillator inside the microprocessor (U0901) along with some external components (C0922-
C0924, L0921, R0922, Y0921) generate the 7.9488 MHz clock. Q0921 is used to alter the clock 
frequency slightly under software control if there is a possibility of harmonics of this clock source 
interfering with the desired radio receive frequency.
The microprocessor E9/E20 (U0101) contains internal 12 (E9) or 20 (E20) Kbytes ROM, 512 (E9) or 
768 (E20) bytes SRAM and 512 bytes EEPROM.
The microprocessor’s RAM is always powered to maintain parameters such as the last operating 
mode. This is achieved by maintaining 5V at U0901-25. Under normal conditions, when the radio is 
off +5V USW is formed by FLT A+ via D0892. C0898 allows the battery voltage to be disconnected 
for a couple of seconds without losing RAM parameters. Diode D0892 prevents radio circuitry from 
discharging this capacitor.
There are 8 analogue to digital converter ports (A/D) on U0901. They are labelled within the device 
block as PE0-PE7. These lines sense the voltage level ranging from 0 to 5V of the input line and 
convert that level to a number ranging from 0 to 255 which can be read by the software to take 
appropriate action.
U0901-22 is the high reference voltage for the A/D ports on the  
m  
P. Resistor R0927 and capacitor 
C0925 filter the +5V reference. If this voltage is lower than +5V the A/D readings will be incorrect. 
Likewise U0901-21 is the low reference for the A/D ports. This line is normally tied to ground. If this 
line is not connected to ground, the A/D readings will be incorrect.
The MODB (U0901-25) input of the  
m 
P must be at a logic ‘1’ for it to start executing correctly. The 
XIRQ (U0901-45) and the IRQ (U0901-46) pins should also be at a logic ‘1’.
The microprocessor can determine the keypad type used, by reading the voltages at pins 63 and 64. 
Connections JU0911 and JU0912 are provided by the individual keypads.
Capacitors C0927 and C0928 serve to filter out any AC noise on +5V line at U0901. 
3.6 Serial Peripheral Interface (SPI) 
The host radio (master) communicates to the control head  
m  
P (slave) through its SPI port (BUS). 
This port consists of SPI TRANSMIT DATA (SPI MOSI) (U0901-52), SPI RECEIVE DATA (SPI 
MISO) (U0901-51), SPI CLK (SPI CLCK BUF) (U0901-53) and a control head select line (CNTL HD 
CE) (U0901-54). This BUS is a synchronous bus, in that the timing clock signal SPI CLCK is sent 
while SPI data (SPI TRANSMIT DATA or SPI RECEIVE DATA) is sent. Therefore, whenever there is 
activity on either SPI TRANSMIT DATA or SPI RECEIVE DATA there should be a uniform signal on 
SPI CLK. The SPI TRANSMIT DATA is used to send serial from the host radio to the control head  
m  
P,  
and SPI RECEIVE DATA is used to send data from the control head  
m  
P to the host radio.