Motorola GM950 User manual

GM950
Motorola
Brand
Motorola
Model
GM950
Type
User manual

The Motorola GM950 is a versatile two-way radio that offers reliable communication for businesses and organizations. With its compact size and lightweight design, it's easy to carry and use throughout the day. The GM950 features 16 channels, allowing you to communicate with different groups or individuals on your team. It also boasts a long battery life, ensuring you stay connected even during extended shifts or emergencies. The built-in VOX (voice-activated transmission) function enables hands-free operation, enhancing convenience and safety.

The Motorola GM950 is a versatile two-way radio that offers reliable communication for businesses and organizations. With its compact size and lightweight design, it's easy to carry and use throughout the day. The GM950 features 16 channels, allowing you to communicate with different groups or individuals on your team. It also boasts a long battery life, ensuring you stay connected even during extended shifts or emergencies. The built-in VOX (voice-activated transmission) function enables hands-free operation, enhancing convenience and safety.

Control Heads/Control Microphones Specific Information 4-i
Chapter 4
Control Heads/Control Microphones
Specific Information
Table of Contents
Table of Contents
Chapter Page
4A Control Head for Radio Model N2 ........................................................ 4A.1-i
4B Control Head for Radio Model N3......................................................... 4B.1-i
4C Hand Held Control Microphone GMN6151...........................................4C.1-i
4D Control Head for Radio Model N4.........................................................4D.1-i
Table of Contents
4-ii Control Heads/Control Microphones Specific Information
Control Head for Radio Model N4 4D-i
Chapter 4D
Control Head for Radio Model N4
Table of Contents
Table of Contents
Chapter
4D.1 Introduction/Theory of Operation
4D.2 PCB/Schematic Diagram and Parts List
Table of Contents
4D-ii Control Head for Radio Model N4
Introduction/Theory of Operation 4D.1-i
Chapter 4D.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
4D.1-ii Introduction/Theory of Operation
Overview
Introduction/Theory of Operation 4D.1-1
1.0 Overview
128 Channel, Radio Model N4 Control Head
The features of the N4 radio control head are as follows:
■
■■
On/Off Button
■
■■
Rocker Type Volume Up/Down Control
■
■■
Dot matrix, Backlit LCD display
■
■■
3 LEDs (Red, Yellow, Green)
■
■■
Up/Down keys for Channel Increment/Decrement
■
■■
7 Dealer Programmable Option Buttons
■
■■
Clear and Select Buttons
■
■■
Full DTMF keypad
■
■■
Microphone socket
4D
.
1
21 3
4
5
8
6
7
9
0
C
Exploded View Diagram
4D.1-2 Introduction/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
8486015B02
Keypad
7586002B01
LCD module
7286003B01
Gasket, LCD
3286005B01
Housing back
1586001B01
Housing, front
Control head
1586000B01
Frame, LCD
0786004B01
LAPD0008
Theory of Operation
Introduction/Theory of Operation 4D.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 µP that the On/Off button is pressed. If the radio is switched off, the
µP 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
4D.1-4 Introduction/Theory of Operation
3.5 Microprocessor Circuit
The control head uses the Motorola 68HC11E9 or 68HC11E20 (dependent on the used character
set) microprocessor (µP) (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 µP. 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 µP 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 µP (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 µP,
and SPI RECEIVE DATA is used to send data from the control head µP to the host radio.
Theory of Operation
Introduction/Theory of Operation 4D.1-5
When the host radio needs to communicate to the control head µP it brings the control head select
line (CNTL HD CE) to a logic ‘0’ and then sends the proper data and clock signals. After the data has
been sent the control head select line is returned to a logic ‘1’. When the control head µP wants to
communicate to the host radio the µP brings request line CNTL HD REQ to a logic ‘0’ by switching
on transistor Q0931 via µP pin 11. The host radio then starts communication by activating the
control head select line (CNTL HD CE), sending the clock signal and sending data via SPI MOSI or
receiving data via SPI MISO and buffer U0931-1.
3.7 Keypad Keys
The control head keypad is a 26 - key keypad. All keys are configured as 6 analogue lines (AN 0 - 5)
to the control head µP. Lines AN 0 - 3 each control four keys, lines AN 4, 5 each control five keys.
The voltage on the analogue lines varies between 0V and +5V depending on which key has been
pressed. If a button is pressed, it will connect one of the 6 lines AN 0 - 5 to a resistive voltage divider
R0807 - R0811 connected to +5V. The voltages of the lines are A/D converted inside the µP (ports
PE 0 - 5) and specify the pressed button.
3.8 Status LED and Back Light Circuit
All the indicator LEDs (D0881 - D0884) are driven by current sources Q0881 - Q0883. To change
the LED status the host radio sends a data message via SERIAL PERIPHERAL INTERFACE (SPI)
to the control head µP. The control head µP determines the LED status from the received message
and switches the LEDs on or off via pins 5, 6, 7. The LED status is stored in the µP’s memory. The
LED current is determined by the resistor at the emitter of the respective current source transistor.
The backlight for the LCD and the keypad is controlled by the host radio the same way as the
indicator LEDs using µP pins 8, 9, 10. The keypad backlight current is drawn from the FLT A+ source
and controlled by transistor Q0851. The current flowing through the LEDs cause a proportional
voltage drop across the parallel resistors R0861, R0862. This voltage drop is amplified by the op-
amp U0831-2. U0831-2 and Q0852 form a differential amplifier. The voltage difference between the
base of Q0852 and the output of U0831-2 determines the current from the base of the LED control
transistor Q0851 and in turn the brightness of the LEDs. The µP can switch the LEDs on and off by
a logic high or low level at the port connected to the base of Q0852. If the base of Q0852 is at
ground level, Q0852 is switched off and no current flows through Q0851 and the LEDs. If the µP port
changes to +5V a current flows through Q0852 and in turn through Q0851 causing the LEDs to turn
on and a rising voltage drop across R0861, R0862. The rising voltage causes the output of the op-
amp to rise and to reduce the base to emitter voltage of Q0852. This decreases the current of
Q0852 until the loop has settled. The backlight for the LCD uses a similar circuit. By using two µP
ports (pin 8, 9) and different weighting resistors R0837 and R0838 the base of Q0832 can be set to
four different voltage levels. This allows to switch the LEDs off or to select among three levels of
brightness.
3.9 Liquid Crystal Display (LCD)
The LCD module U0902 consists of the display and the display driver. The display is a single layer
super twist nematic (STN) LCD display. It has a dot matrix of 24 x120 dots for displaying graphics
and alpha - numerical information, a line with 19 pre - defined icons below the dot matrix and line
with 11 bars below the icon line. Six of the bars can be used to display the status of the keys located
below.
Theory of Operation
4D.1-6 Introduction/Theory of Operation
The display driver is fixed on the flex which connects the display to the PC board. The driver
contains a data interface to the µP, an LCD segment driver, an LCD power circuit, an oscillator, data
RAM and control logic. At power up the driver’s control logic is reset by a logic ‘0’ at input RES
(U0902-9). Resistor R0946 sets the driver’s internal oscillator to about 18 kHz. By connecting U0902
pin 12 to +5V the driver’s µP interface is configured to accept 8 bit parallel data input (U0902-D0-D7)
from the control head µP (U0901 port PC0-PC7). Pin 15 connected to +5V sets the 6800 µP control
mode.
To write data to the driver’s RAM the µP sets chip select (U0902-14) to logic ‘1’ via U0901-59 and R/
W (U0902-17) to logic ‘0’ via U0901-56. With input A0 (U0902-16) set to logic ‘0’ via U0901-58 the
µP writes control data to the driver. Clock signal E at pin 18 generated by µP pin 57, shifts 8 bit
parallel data into the driver. Control data includes the RAM start address for the following display
data. With input A0 set to logic ‘1’ the µP then writes the display data to the display RAM. When data
transfer is complete the µP terminates the chip select and the clock activities.
The voltage supply for the display is provided by the display driver power circuit. This circuit consists
of a voltage multiplier, voltage regulator and a voltage follower. To use an external voltage supply the
built-in power circuit can be turned off by a control command. The settings of the inputs T1 (U0902-
36) and T2 (U0902-35) select among the various functions of the power circuit. With both inputs set
to ground level by resistors R0955 and R0956 the voltage multiplier, the voltage regulator and the
voltage follower are activated and no external voltage supply is required for the LCD. The external
capacitors C0951 - C0953 configure the multiplier to triple the supply voltage. If R0957 is used
instead of C0952 the multiplier doubles the supply voltage. In this configuration the multiplier output
VOUT (U0902-42) supplies a voltage of -5V (2* -5V below VDD). The multiplied voltage VOUT is
sent to the internal voltage regulator. To set the voltage level of the regulator output V5 (U0902-43)
this voltage is divided by the resistors R0958 and R0959 and feed back to the reference input VR
(U0902-44). In addition the regulator output voltage V5 can be controlled electronically by a control
command sent to the driver. With the used configuration the voltage V5 is about -3V. The voltage V5
is resistively divided by the driver’s voltage follower to provide the voltages V1 - V4. These voltages
are needed for driving the liquid crystals. The driver circuit can be configured to use externally
generated voltages for VOUT and V1 - V5. In this case the +5V supply voltage is multiplied by the µP
(U0901-62) along with the multiplier circuit D0911, C0911, C0912, R0911 and R0913. The µP
provides a square wave signal at pin 62 to drive the multiplier circuit. The voltages V1-V4 are
generated from VOUT or V5 by the resistive divider R0941 - R0945 and supplied to the driver ports
V1 - V5. Dependent on the configuration the level of VOUT or V5 can be measured by one of the
µP’s analogue to digital converters (U0901-20) via resistive divider R0914, R0915. To stabilize the
display brightness over a large temperature range the µP measures the temperature via analogue to
digital converter (U0901-18) using thermistor R0918 and resistor R0917. Dependent on the
measured temperature the µP adjusts the driver output voltage V5, and in turn the display
brightness, via parallel interface.
3.10 Microphone Connector
Signals BUS+, PTT, HOOK, MIC HI, HANDSET AUDIO and FLT A+ available at the microphone
connector J0903, are connected to the radio’s controller section via connector J0901.
3.11 Electrostatic Transient Protection
Electrostatic transient protection is provided for the sensitive components in the control head by
diodes VR0901 - VR0905, VR0931 - VR0935. The diodes limit any transient voltages to tolerable
levels. The associated capacitors provide Radio Frequency Interference (RFI) protection.
PCB/Schematic Diagram and Parts List 4D.2-i
Chapter 4D.2
PCB/Schematic Diagram and Parts List
Table of Contents
Table of Contents
Description Page
Control Head (N4) - Diagrams and Parts Lists
PCB Layout Component Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
PCB Layout Solder Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table of Contents
4D.2-ii PCB/Schematic Diagram and Parts List
Control Head (N4) PCB No. 8486015B03_T1
Diagrams and Parts List 4D.2-1
Control Head (N4)
PCB No. 8486015B03_T1
C0831
C0841
C0861
C0891
C0892
C0893
C0894
C0895
C0896
C0897
C0898
C0900
C0901
C0902
C0903
C0904
C0905
C0906
C0907
C0911
C0912
C0921
C0922
R0930
C0924
C0925
C0926
C0927
C0928
C0930
C0931
C0932
C0933
C0934
C0935
C0936
C0937
C0938
C0941
C0942
C0943
C0944
C0945
C0946
C0947
C0948
C0949
C0950
C0951C0952
C0953
C0954
C0955
D0891
D0892
D0911
D0931
D0951
J0901
J0902
L0921
Q0831
Q0832
Q0851
Q0852
Q0881
Q0882
Q0883
Q0891
Q0921
Q0931
Q0932
R0801
R0802
R0803
R0804
R0805
R0806
R0807
R0808
R0809
R0810
R0811
R0831
R0832
R0833
R0834
R0835
R0836
R0837
R0838
R0839
R0840
R0841
R0842
R0843
R0851
R0852
R0853
R0854
R0855
R0856
R0857
R0858R0859
R0860
R0861
R0862
R0881
R0882
R0883
R0891
R0892
R0893
R0894
R0895
R0896
R0897
R0901
R0902
R0903
R0904
R0905
R0906
R0907
R0911
R0912
R0913
R0914
R0915
R0916
R0917
R0919
R0920
R0921
R0922
R0923
R0924
R0925
R0926
R0927
R0928
R0929
R0931
R0932
R0933
R0934
R0936
R0937
R0938
R0941
R0942
R0943
R0944
R0945
R0946
R0950
R0951
R0952
R0953
R0954
R0955
R0956
R0957
R0958
R0959
R0960
U0831
U0891
U0892
U0901
U0902
U0931
VR0891
VR0901
VR0902
VR0903
VR0904
VR0905
VR0906
VR0931
VR0932
VR0933
VR0934
VR0935
Y0921
Y0922
1
51
20
10
30
40
16
17
1
54
49
48
33
32
1
18
19
20
9
5
8
4
1
8
8
1
1
4
4
4
55
51
8
2
3
6
7
TP0904
TP0937
TP0905
TP0936
TP0931
TP0935
TP0907
TP0934
TP0933
TP0932
8486015B03-T1
MOTOROLA 1997
C
TP0881
TP0882
TP0883
TP0901
TP0903
TP0951
TP0952
TP0953
TP0954
TP0902
Bottom Side
D0801
D0802
D0803
D0804
D0805
D0806
D0807
D0808
D0809
D0810
D0811
D0812
D0813
D0814 D0815
D0816
D0817
D0818
D0819
D0820
D0821
D0822
D0823
D0824
D0825
D0826
D0827 D0828
D0829
D0830
D0851
D0852
D0853
D0854
D0855
D0856
D0857
D0858
D0859
D0860
D0861
D0862
D0863
D0864
D0865
D0866
D0867
D0868
D0869
D0870
D0871
D0872
D0873
D0874
D0875
D0876
D0881
D0882
D0883
D0884
J0903
R0918
JU0911
JU0912
PB0801
PB0802
PB0803
PB0806 PB0807 PB0808
PB0809
PB0810
PB0811
PB0812
PB0813
PB0814
PB0815
PB0816
PB0817
PB0818
PB0819
PB0820
PB0821
PB0822
PB0823
PB0824
PB0826
PB0931
PB0825
PB0804
PB0805
7
5
3
1
8
6
4
2
Component Side 8486015B03-T1 GEPD5548-1
Top Side
Control Head (N4) Schematic Diagram
4D.2-2 Diagrams and Parts List
Control Head (N4) Schematic Diagram
1 of 2
16
18
INT_SPKR-
ON/OFF
12
N.C.
11
3
4
BUS+
N.C.
N.C.
Graphic Display
14
8
15
SCI-RX
9
GND
GND
17
MOTOROLA
N.C.
10
FLEX
J0901
CONTROLLER
INT_SPKR+
LCD_CLCK_BUF
HOOK
FLT_A+
13
MIC_HI
J0903
7
SCI-TX
MODE
+5V
1
VPP (IXRQ)
RESET
GND
2
FLT_A+
J0101
5
6
HANDSET_AUDIO
PTT
6
8
R0955
0
1
J0902-8
2
J0902-1
4
J0902-2
2
J0902-4
C0945
.1uF
VR 903
14V
5.6V
R0916
VR0934
47K
JU0911
C0943
.1uF
3
C0937
470pF
NU
47K
JU0912
R0906
R0907
0
0
NU
47K
47K
C0903
470pF
NU
R0960
470pF
C0904
NU
100
R0934
1K
R0933
1K
R0932
1
2
3
D0931
.1uF
C0946
NU
470pF
NU
C0931
470pF
C0935
NU
Q0932
5
47K
47K
4
J0902-5
2
C0936
470pF
TP0902
TP0904
C0902
470pF
470pF
5
270
13
R0904
14
TP0903
9
R0903
10
R0945
10K
NU
10K
NU
10K
R0944
R0901
22
0
NU
0
NU
R0953
R0954
33
XTL
R0956
0
28
STRA
VDD
55
22
VRH
21
VRL
23
VSS
49
VSS
24
VSS
45
XIRQ
17
PE2
19
PE3
PE4
14
16
PE5
PE6
18
20
PE7
43
RESET
30
R_W*
47
PD0
50
PD1
PD2
51
52
PD3
PD4
53
54
PD5
13
PE0
15
PE1
1
PA0
64
PA1
63
PA2
62
PA3
PA4
59
58
PA5
57
PA6
56
PA7
61
NC10
4
NC3
26
NC4
32
NC5
35
NC6
44
NC7
NC8
48
60
NC9
11
PB1
29
CLK_E
31
EXTAL
46
IRQ
MODA
27
25
MODB
2
NC
3
NC1
5
PB7
37
PC2
38
PC3
39
PC4
PC5
40
41
PC6
PC7
42
12
PB0
34
PC0
36
PC1
10
PB2
PB3
9
8
PB4
PB5
7
6
PB6
MC68HC711E20
U0901
2.2uF
15
C0953
10K
3
R0927
7
J0902-3
6 J0902-6
5
0
R0957
7
7
6
.1uF
C0926
R0923
R0926 2.2K
4
47K
.01uF
C0927
R0924
47K
3.3uF
C0928
.1uF
C0941
C0933
470pF
NU
10K
NU
5
R0941
R0959
390K
2.2uF
NU
C0951
2.2uF
C0952
2
VR 904
14V
10K
R0905
NU
12
0
R0902
4
R0943
NU
1MEG
30K
2
R0946
C0947
.1uF
NU
.1uF
NU
7
C0949
4.7K
NU
R0921
.1uF
C0925
10KR0925
Q0921
NU
1
5
33uH
L0921
100
0
NU
R0928
7
R0952
4
J0902-7
3
47K
47K
Q0931
R0950
10K
17
3
5.6V
2
5
VR 902
TC7S08F
XX
XX
XX
C0930
.1uF
U0931-1
4
.1uF
2
TP0901
4
C0944
.1uF
18
SH0901
8
NU
2
46
1
35
TP0951
KEY
PB0931
R0912
0
2.2K
NU
R0911
1uF
C0911
NU
R0917
10K
0
NU
2
3
1
R0913
D0911
NU
10K
NU
8
R0942
1uF
C0912
1uF
.1uF
C0942
1
4.7K
R0937
11
6
R0938
4.7K
VR 901
4.7K
6
7
5.6V
5
1
NU
1
2
3
D0951
1K
R0931
10
C0901
R0951
33K
16
C0906
470pF
NU
470pF
NU
C0907
VR 905
14V
NU
0102725B71
Controlhead T sheet 1
C0900
470pF
NU
3.3uF
C0955
3.3uF
.01uF
C0954
.01uF
R0958
680K
33pF
C0922
C0924
22pF
33pF
NU
C0921
5.6V
NU
VR0933
5.6V
VR0935
470pF
C0934
NU
VR0931
5.6V
470pF
C0932
NU
VR0932
5.6V
INSTPAR
Y0921
4
1
R0930
7.9488 MHz
TP0954
0
100K
1
R0914
0
TP0953
5
4
4
1
6
3
3
R0918
100K
5
NU
.1uF
C0950
NU
R0919
0
47K
R0929
.1uF
NU
C0948
R/W*
17
NU
5.6V
VR0906
V5
50
V5
43
VDD
7
VDD
45
VOUT
42
VR
44
VSS
19
VSS
37
V1
46
V2
5
V2
47
V3
4
V3
48
V4
3
V4
49
V5
2
E
18
RES
9
SCL
10
SI
11
SYNC
30
T1
36
T2
35
V1
6
DYO
28
FR
31
M/S*
8
NC
1
NC
51
OSC1
34
OSC2
33
P/S*
12
D0
20
D1
21
D2
22
D3
23
D4
24
D5
25
D6
26
D7
27
CAP1+
38
CAP1-
39
CAP2+
40
CAP2-
41
CL
32
CLO
29
CS1
13
CS2
14
NU
A0
16
6800/8080*
15
200K
U0902
R0915
PWR_GND
GND
XX
VCC
XX
TP0952
4.7K
U0931-2
3
R0936
R0922
1.8MEG
Y0922
C1
XX
C2
XX
GND
XX
470pF
C0905
NU
FLT_A+
FLT_A+
HANDSET_AUDIO
MIC_HI
HOOK
PTT
BUS+
BUS+
+5V
+5V
+5V
+5V
LED(2:7)
AN(0:5)
+5V
+5V +5V
+5V
FLT_A+
+5V
+5V
RESET
FLT_A+
BUS+
+5V
+5V
+5V
+5V
SPI_MISO
SPI_MOSI
CNTL_HD_CE
V5
V4
V3
V2
V1
+5V
V5
SPI(1:5) +5V_USW
LCD(4:7)
VOUT
V5
+5V
VOUT
+5V_SOURCE
+5V_SOURCE
ON_OFF_CONTROL
ANALOG_3
CNTL_HD_REQ
+5V
+5V
V5
V5
V4
V4
V3
V3
V2
V2
V1
V1
+5V
SPI_CLCK_BUF
GEPD5545-2
470pF
C0938
1.8MEG
R0920 NU
NU
NU
Control Head (N4) Schematic Diagram
Diagrams and Parts List 4D.2-3
Control Head (N4) Schematic Diagram
2 of 2
yellow
*
BASE
A
CH
3
ARROW
B
PHONE
#
2
5
UP
yellow
VOL UP
VOL DOWN
DOWN
red
green
8
0
1
CALL
FLIP
9
6
MONITOR
CLEAR
4
7
10K
R0841
D0871
D0816
D0867
D0820D0812 D0824 D0828
10K
R0840
10K
R0842
10
10
10
10
D0868
R0843
R0837
3.3K
D0872 D0876
D0853 D0857 D0861 D0865 D0873D0869
D0808
D0806
D0807
D0802
D0801
D0803
D0804
5
7
Q0831
U0831-2
PWR_GND
6
.1uF
C0841
.1uF
Q0851
D0860
Q0852
D0851 D0859 D0863D0855
D0856
10K
R0859
D0852
R0860
10K
D0818 D0826D0822
100K
R0839
D0830
D0875
D0811 D0815 D0823D0819 D0827
D0870 D0874
.1uF
C0861
R0851
10K
R0858
100K
R0857
4.7K
33K
R0852
R0861
10 10
R0862
1.5K
R0854
1.5K
R0853
1.5K
1.5K
1.5K
1.5K
R0856
1.5K
R0855
1.5K
R0833
1.5K
1.5K
R0834
1.5K
1.5K
R0835
1.5K
R0836
1.5K
R0838
4.7K
Q0832
R0832
33K
D0864
R0831
10K
10K
PWR_GND
2
3
1
U0831-1
D0805
R0809
3.3K
3.3K
100K
R0892
.1uF
46
1
35
C0891
PB0823
2
2
46
1
35
2
46
1
35
PB0824
PB0826
PB0819
2
46
1
35
2
46
1
35
5
PB0825
PB0820
2
46
1
3
2
4
6
1
35
5
PB0821
PB0822
2
46
1
3
2
46
1
35
35
PB0815
PB0816
24
6
1
24
6
1
35
1
35
PB0818
PB0811
2
46
246
1
35
6
1
35
PB0817
PB0812
2
4
2
46
1
35
6
1
35
PB0813
PB0814
2
4
5 1
200K
R0801
200K
3.3K
3.3K
4
R0810
R0804
200K
200K
3.3K
3.3K
03
R0808
200K
R0803
200K
R0805
200K
200K 3.3K
R0807
3.3K
200K
200K
R0802
C0831
0102725B71_2
10
.1uF
R0893
R0894
10
1
2
3
2.2K
D0892
2.2K
R0896
C0897
470pF
470pF
6
5
C0898
47uF
47uF
2
46
1
35
1
35
PB0807
PB0806
2
46
2
46
1
35
6
1
35
PB0808
PB0809
2
4
2
46
1
35
6
1
35
PB0810
PB0802
2
4
2
46
1
35
5
3
PB0801
PB0803
2
46
1
3
2
1
3
1
3
4
PB0804
PB0805
2
200K
200K
7
R0806
5.1V
VR0891
4.7K
2
R0897
10K
R0891
D0891
1
2
3
D0809 D0821D0813 D0817 D0825
D0814
D0829
D0810
R0811
3.3K
3.3K
D0858 D0866
Q0891
47K
47K
Q0881 Q0883Q0882
D0882
TP0881
D0881
TP0883
TP0882
D0884
270
R0881
D0883
270
R0882 R0883
470
4
GND
8
VCC
U0831-3
PWR_GND
1
RESET
2
4
GND
2
INPUT
3
NC1
5
NC2
6
NC3
7
NC4
8
NC5
MC33064
U0892
MC33064
7
FEEDBACK
4
GND
8
INPUT
1
OUTPUT
2
SENSE
3
SHUTDOWN
U0891
5V_TAP
6
5
ERROR
D0862
LP2951CM
0
R0895
C0894
.022uF
C0895
47uF
NU
C0893
10uF
.1uF
C0892
C0896
.1uF
NU
D0854
+5V_USW
FLT_A+
LED(2:7)
+5V
FLT_A+
FLT_A+
FLT_A+ FLT_A+FLT_A+
FLT_A+
+5V
AN(0:5)
RESET
+5V_SOURCE
FLT_A+
+5V
GEPD5546-1
Controlhead T sheet 2
Control Head (N4) Schematic Diagram
4D.2-4 Diagrams and Parts List
Control Head (N4)
Parts List
Circuit
Ref
Motorola
Part No.
Description
C0831 2113743E20 100nF 16V
C0841 2113743E20 100nF 16V
C0861 2113743E20 100nF 16V
C0891 2113743E20 100nF 16V
C0892 2113743E20 100nF 16V
C0893 2311049A45 TANT 10uF 10% 35V
C0894 2113743E07 22nF 16V
C0895 2311049A99 TANT 47uF 20% 10V
C0896 2113743E20 100nF 16V
C0897 2113741F17 470pF 50V
C0898 2311049A99 TANT 47uF 20% 10V
C0901 2113741F17 470pF 50V
C0902 2113741F17 470pF 50V
C0912 2311049A09 TANT 2.2uF 10% 20V
C0922 2113740F35 22pF 5% 50V NP0
C0924 2113740F39 33pF 5% 50V NP0
C0925 2113743E20 100nF 16V
C0926 2113743E20 100nF 16V
C0927 2113741F49 10nF 50V
C0928 2311049A42 TANT 3.3uF 10% 6V
C0930 2113743E20 100nF 16V
C0936 2113741F17 470pF 50V
C0938 2113741F17 470pF 50V
C0941-
C0945
2113743E20 100nF 16V
C0951 2311049A09 TANT 2.2uF 10% 20V
C0953 2311049A09 TANT 2.2uF 10% 20V
C0954 2113741F49 10nF 50V
C0955 2311049A42 TANT 3.3uF 10% 6V
D0801-
D0830
4805729G75 LED GREEN HP
D0851-
D0876
4805729G75 LED GREEN HP
D0881 4805729G73 LED YEL HP
D0882 4805729G73 LED YEL HP
D0883 4805729G75 LED GREEN HP
D0884 4805729G74 LED RED HP
D0891 4813833C02 DUAL SOT MMBD6100
D0892 4813833C02 DUAL SOT MMBD6100
D0931 4813833C02 DUAL SOT MMBD6100
J0901 0902636Y01 Connector Flex Side Entry
J0903 2805924V01 CONNECTOR MIC
Q0831 4813822A08
Q0832 4813824A10 NPN 40V .2A B=50-150
Q0851 4813822A08
Q0852 4813824A10 NPN 40V .2A B=50-150
Q0881 4813824A10 NPN 40V .2A B=50-150
Q0882 4813824A10 NPN 40V .2A B=50-150
Q0883 4813824A10 NPN 40V .2A B=50-150
Q0891 4880048M01 NPN DIG 47k/47k
Q0931 4880048M01 NPN DIG 47k/47k
Q0932 4880048M01 NPN DIG 47k/47k
R0801-
R0806
0662057B05 200k 1/16W
R0807-
R0811
0662057A61 3k3 1/16W 5%
R0831 0662057A73 10k 1/16W 5%
R0832 0662057A85 33k 1/16W 5%
R0833 0662057A53 1k5 1/16W 5%
R0834 0662057A53 1k5 1/16W 5%
R0835 0662057A53 1k5 1/16W 5%
R0836 0662057A53 1k5 1/16W 5%
R0837 0662057A61 3k3 1/16W 5%
R0838 0662057A65 4k7 1/16W 5%
R0839 0662057A97 100k 1/16W
R0840 0662057A73 10k 1/16W 5%
R0841 0662057A73 10k 1/16W 5%
R0842 0680194M01 10 1W 5%
R0843 0680194M01 10 1W 5%
R0851 0662057A73 10k 1/16W 5%
Circuit
Ref
Motorola
Part No.
Description
R0852 0662057A85 33k 1/16W 5%
R0853 0662057A53 1k5 1/16W 5%
R0854 0662057A53 1k5 1/16W 5%
R0855 0662057A53 1k5 1/16W 5%
R0856 0662057A53 1k5 1/16W 5%
R0857 0662057A65 4k7 1/16W 5%
R0858 0662057A97 100k 1/16W
R0859 0662057A73 10k 1/16W 5%
R0860 0662057A73 10k 1/16W 5%
R0861 0680194M01 10 1W 5%
R0862 0680194M01 10 1W 5%
R0881 0660076A35 270 5 1/8
R0882 0660076A35 270 5 1/8
R0883 0662057A41 470 1/16W 5%
R0891 0662057A73 10k 1/16W 5%
R0892 0662057A97 100k 1/16W
R0893 0662057A01 10 1/16W 5%
R0894 0662057A01 10 1/16W 5%
R0896 0662057A57 2k2 1/16W 5%
R0897 0662057A65 4k7 1/16W 5%
R0901 0662057A09 22 1/16W 5%
R0902 0662057B47 0 1/16W
R0903 0662057A01 10 1/16W 5%
R0904 0662057A35 270 1/16W 5%
R0906 0662057A89 47k 1/16W 5%
R0912 0662057B47 0 1/16W
R0914 0662057A97 100k 1/16W
R0915 0662057B05 200k 1/16W
R0916 0662057A89 47k 1/16W 5%
R0917 0662057A97 100k 1/16W 5%
R0918 0680149M02 THERMISTOR 100K @25C
R0922 0662057B28 1.8M 1/16W 5%
R0923 0662057A89 47k 1/16W 5%
R0924 0662057A89 47k 1/16W 5%
R0925 0662057A73 10k 1/16W 5%
Circuit
Ref
Motorola
Part No.
Description
R0926 0662057A57 2k2 1/16W 5%
R0927 0662057A73 10k 1/16W 5%
R0928 0662057A25 100 1/16W 5%
R0929 0662057A89 47k 1/16W 5%
R0930 0662057B47 0 1/16W
R0931 0662057A49 1k 1/16W 5%
R0932 0662057A49 1k 1/16W 5%
R0933 0662057A49 1k 1/16W 5%
R0934 0662057A25 100 1/16W 5%
R0936 0662057A65 4k7 1/16W 5%
R0937 0662057A65 4k7 1/16W 5%
R0938 0662057A65 4k7 1/16W 5%
R0946 0662057B22 1M 1/16W 5%
R0950 0662057A73 10k 1/16W 5%
R0951 0662057A85 33k 1/16W 5%
R0955 0662057B47 0 1/16W
R0956 0662057B47 0 1/16W
R0957 0662057B47 0 1/16W
R0958 0662057B18 680K 1/16W 5%
R0959 0662057B12 390k 1/16W 5%
R0960 0662057A89 47k 1/16W 5%
U0891 5105469E65 IC VLTG REGLTR LP2951C
U0901 5102226J16 68HC711E20 64PQFP OTP
U0931 5105279V65 TC7S08F
VR0891 4813830A14 5.1V 5% 225mW
VR0901 4813830A15 5.6V 5% 225mW
VR0902 4813830A15 5.6V 5% 225mW
VR0903 4813830A27 14V 5% 225mW MMB
VR0904 4813830A27 14V 5% 225mW MMB
VR0931-
VR0934
4813830A15 5.6V 5% 225mW
Y0921 4880113R01 CRYSTAL 7.9488
Circuit
Ref
Motorola
Part No.
Description
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Motorola GM950 User manual

GM950
Motorola
Brand
Motorola
Model
GM950
Type
User manual

The Motorola GM950 is a versatile two-way radio that offers reliable communication for businesses and organizations. With its compact size and lightweight design, it's easy to carry and use throughout the day. The GM950 features 16 channels, allowing you to communicate with different groups or individuals on your team. It also boasts a long battery life, ensuring you stay connected even during extended shifts or emergencies. The built-in VOX (voice-activated transmission) function enables hands-free operation, enhancing convenience and safety.

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