Motorola GM950 User manual

Control Heads/Control Microphones Specific Information 4-i

Chapter 4

Control Heads/Control Microphones

Speciﬁc Information

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

Hand Held Control Microphone GMN6151 4C-i

Chapter 4C

Hand Held Control Microphone GMN6151

Table of Contents

Chapter

4C.1 Introduction/Theory of Operation

4C.2 PCB/Schematic Diagram and Parts List

Table of Contents

4C-ii Hand Held Control Microphone GMN6151

Introduction/Theory of Operation 4C.1-i

Chapter 4C.1

Introduction/Theory of Operation

Table of Contents

Paragraph Page

1.0 Overview..................................................................................................... 1

2.0 Mechanical Parts List.................................................................................1

3.0 Theory of Operation .................................................................................. 2

3.1 General........................................................................................................ 2

3.2 Power Supplies............................................................................................ 2

3.3 Power On / Off............................................................................................. 2

3.4 PTT Button................................................................................................... 2

3.5 ON/OFF Hook Control................................................................................. 2

3.6 Keypad and Top Keys ................................................................................. 3

3.7 Switch Functions.......................................................................................... 3

3.8 Status LED and Back Light Circuit............................................................... 3

3.9 Liquid Crystal Display (LCD)........................................................................ 4

3.10 Microphone Amplifier................................................................................... 4

3.11 Speaker ........................................................................................................4

3.12 Connections to the Radio ............................................................................ 4

3.13 Electrostatic Transient Protection................................................................ 5

3.14 Jumper Functions........................................................................................ 5

Table of Contents

4C.1-ii Introduction/Theory of Operation

Overview

Introduction/Theory of Operation 4C.1-1

1.0 Overview

Hand Held Control Microphone GMN6151

The features of the Hand Held Control Microphone are as

follows:

■

■■

On/Off Button

■

■■

Rocker Type Volume Up/Down Control

■

■■

Rocker Type Scroll Up/Down Control

■

■■

3 digit, 7 segment Backlit LCD display

■

■■

8 LCD Annunciators/Icons

■

■■

3 LEDs (Red, Yellow, Green)

■

■■

7 Dealer Programmable Option Buttons

2.0 Mechanical Parts List

GMN6151A Hand Held Control Mic

HLN9073B Hang-up Clip

AHN6050A HSG ASSY SPI

GLN7338A HH CONTROL MIC PCB

0102725B82 LCD GM950

7586044B02 Keypad code GM950

0102725B83 FRONT HSG

0102708D08 ASSY MIC

0102708D07 ASSY SPEAKER

3386016B03 Nameplate (GMN6151A)

5680918X03 CNT BOX

0102725B82 HHCM LCD GM950

1305844X01 Bezel LCD

2805397L10 Conn. Elastomer

3205157Y01 Gasket Lens

6105842X01 Lightpipe LCD

9105447Y01 Filter Display

5408344X01 40mm x 8 mm Label

7202698Y01 LCD GM950

AHN6050A HSG ASSY SPI HHCM

1105760Y01 Adhes. Cable Retainer

1505892Y01 Cover,rear

3005153Y06 Cable Coil

3205082E93 Gskt. O-Ring, main

4205158Y01 Retainer Cord

4205343Y01 Retainer

GMN6151

(GM950)

0102725B83 HHCM FRONT HSG

1505891Y02 Housing

3305409X08 LLBL Nameplate

3505671Y01 Grillcloth

3805835X01 Button PTT

4505850X01 Lever PTT

7505618V02 Keypad PTT

0102708D08 ASSY MIC

3005637Y01 Cable Mic

5013920A01 Microphone Mini Elecret

0102708D07 ASSY SPEAKER

3005637Y01 Cable Mic

5005213W01 Speaker

7505581W02 Pad Speaker

Theory of Operation

4C.1-2 Introduction/Theory of Operation

3.0 Theory of Operation

3.1 General

The Control Microphone contains the speaker, the microphone, several buttons to operate the radio,

several indicator Light Emitting Diodes (LED) to inform the user about the radio status and a 3 digit /

7 segment Liquid Crystal Display (LCD) for nummerical information e.g. channel number, select

code.

3.2 Power Supplies

The power supply to the HHCM is taken from the host radio’s FLT A+ voltage via connector J0901

pin 8. This voltage is at battery level and is used for the voltage regulator (U0971), the LEDs, the

back light and to power up the radio via the On / Off button. The voltage regulator (U0971) provides

the stabilized 5 volt source for the display, the display driver, the shiftregister and the keypad buttons.

The regulated output of U0971 is enabled by a low state and disabled by a high state at pin 3 to

switch the HHCM circuits on and off. Input and output capacitors (C0972 and C0975, C0976) are

used to reduce high frequency noise and provide proper operation during battery transients.

3.3 Power On / Off

The On/Off button when pressed switches the radio’s voltage regulators on by pulling ON OFF

CONTROL to high via D0971 and connects the base of Q0971 to FLT A+. This transistor pulls the

line ANALOG 3 to 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.

While the radio is switched on, the radio’s controller enables the regulated output pin 1 of U0971 by

setting line LED CE to high and in turn pulling input U0971-3 to ground by transistor Q0972. Line

LED CE is also used to write data into the shiftregister U0983. After the serial write process line LED

CE is set to low for a few microseconds to update the output of the shiftregister with the new data.

The low - pass ﬁltering provided by C0973 and R0974 ﬁlters out these small low periods and

prevents disabling of the voltage regulator output.

3.4 PTT Button

The PTT function is achieved by pressing button PB0901 which places a low on the PTT line to the

radio, causing the radio to transmit.

3.5 ON/OFF Hook Control

When the HHCM is off-hook the monitor input (line HOOK; J0901-9) to the radio is open circuit.

When the HHCM is placed on-hook the hang up clip shorts the TP0901 and TP0902 terminals which

takes the monitor input to ground, indicating to the radio that the microphone is on-hook. Diode

VR0922 and C0922, C0923 provide Electro Static Discharge (ESD) and Radio Frequency

Interference (RFI) protection.

Theory of Operation

Introduction/Theory of Operation 4C.1-3

3.6 Keypad and Top Keys

The HHCM keypad has 10 keys, plus 3 additional keys, the on/off key being one of them, which are

located on the top of the HHCM.

All keys are conﬁgured as 3 analogue lines (ANALOG 1 2 3) to the radio. Each of the lines controls

four keys; line ANALOG 3 additionally controls the on / off key. 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 3 lines ANALOG 1,2,3 to a resistive voltage divider connected to +5V. The

voltages of these lines are A/D converted inside the µP and specify the pressed button.

3.7 Switch Functions

Ten of the switches (PB0931 - PB0934, PB0941 - PB0944, PB0953, PB0954) are the keypad

switches. The remaining 3 Top Key switches (PB0951, PB0952, PB0971) and the PTT switch

(PB0901) are simple contact closure switches. The switches and their functions are detailed below:

Switch Type Function

PB0901 Contact PTT

PB0931 Keypad Conﬁgurable

PB0932 Keypad Conﬁgurable

PB0933 Keypad Conﬁgurable

PB0934 Keypad Conﬁgurable

PB0941 Keypad Volume Down

PB0942 Keypad Volume Up

PB0943 Keypad Conﬁgurable

PB0944 Keypad Conﬁgurable

PB0951 Contact Conﬁgurable

PB0952 Contact Conﬁgurable

PB0953 Keypad Scroll Down

PB0954 Keypad Scroll Up

PB0971 Contact Power ON/OFF

3.8 Status LED and Back Light Circuit

All the indicator LEDs (3) and the back light LEDs (10) are driven by current sources Q0982 - Q0986

and controlled by the µP via SERIAL PERIPHERAL INTERFACE (SPI). The current is determined

by the resistor at the emitter of the respective current source transistor. Shiftregister U0983 stores

the LED status. To update the LED status line LED CLCK BUF shifts the data of line SPI DATA BUF

into the shiftregister. When all the data has been written, line LED CE is set to low for a few

microseconds to update the output of the shiftregister with the new data.

The green (D0983), red (D0982) and yellow (D0981) indicator LEDs are covered by the LCD display.

If a LED is switched on, the corresponding area of the LCD display is switched to transparent by the

respective shiftregister output using Exclusive-OR (XOR) gate U0982-1-4 and the backplane signal

from the LCD driver U0981 pin 26, 27.

The squarewave backplane signal from U0981 is buffered by XOR gate U0982-1 and then fed to one

of each inputs of the three remaining XOR gates. The output of these gates is the inverted

backplane signal, while the connected output of the shiftregister is high, and non-inverted while it is

low. The inverted backplane signal fed to the respective LCD input makes the corresponding area

transparent for the covered LED, while a non - inverted backplane signal makes it non-transparent.

Theory of Operation

4C.1-4 Introduction/Theory of Operation

3.9 Liquid Crystal Display (LCD)

The LCD display H0931 is a 3 digit / 7 segment display which incorporates 11 annunciators. Data is

loaded serially into the display driver U0932 via the SPI interface. The display data of line SPI DATA

BUF is shifted serially by clock signal LCD CLCK BUF. When the last bit has been received, the LCD

display is updated.

3.10 Microphone Ampliﬁer

The microphone cartridge contains a capacitive transducer coupled to a FET ampliﬁer. The

microphone’s audio signal is fed from the microphone inputs, MIC+ and MIC-, at J0903 to the

microphone ampliﬁer. The microphone ampliﬁer sets the frequency response and ampliﬁes the

audio signal to the required radio input level (about 80mV at nominal sound pressure level). The ﬁrst

stage (Q0902) connected to the microphone is an active high-pass ﬁlter which suppresses

frequency components below 300 Hz to prevent PL falsing in a receiving radio. The collector current

of Q0902, drawn from the collector of the following stage Q0901, is approximately 0.27 mA. A low-

pass ﬁlter composed of R0904 and C0907, C0908 ﬁlters out any audio frequency components riding

on this voltage. The output of the ﬁrst stage is fed via R0906 to the second stage (Q0901) which

ampliﬁes the audio signal to the radio’s input level. The supply voltage of the stage is provided by the

radio’s 9V3 voltage regulator via the load resistor (1kΩ) located on the radio’s controller section, line

MIC and connector J0901 pin 4. Q0901 draws a collector current of 2 mA. The collector AC current

of Q0901 causes a voltage drop across the load resistor representing the audio signal from the

microphone.

3.11 Speaker

The HHCM contains a speaker for the receiver audio. The receiver audio signal from the differential

audio output of the audio ampliﬁer located on the radio’s controller is fed via lines INT SPKR+, INT

SPKR-, connector J0901-12,10 and parallel resistors R0921 - R0923 to the speaker connector

J0902 pin 1 and pin 2. The speaker is connected to the connector J0902. Resistors R0921 - R0923

reduce the audio power applied to the speaker to prevent overloading.

3.12 Connections to the Radio

Interconnections between the HHCM and the host radio are via an expanding cable which is

permanently connected to the HHCM. The cable has an 18 pin Molex connector which connects to

connector P0951 in the blank head of the host radio. P0951 is mounted on an adapter PCB. After

additional ﬁltering the signals are fed to the host radio’s main PCB via connector J0950, also located

on the adapter PCB, a ﬂexible ribbon cable and connector J0101. The connections between the

PCB in the HHCM and the main PCB in the radio are shown in the following table:

Theory of Operation

Introduction/Theory of Operation 4C.1-5

3.13 Electrostatic Transient Protection

Electrostatic transient protection is provided for the sensitive components in the HHCM by diodes

VR0901, VR0921, VR0922, VR0924 - VR0929. The diodes limit any transient voltages to tolerable

levels. The associated capacitors provide Radio Frequency Interference (RFI) protection.

3.14 Jumper Functions

The jumpers are used to adapt the function of the keypad buttons for different keypads.

Radio Adapter PCB Cable HHCM Description

J0101 J0950 P0951 Connector J0951

1 18 18 1 12 INT SPKR+

2 17 17 2 10 INT SPKR-

13 6 16 3 2 ANALOG 3

4 15 15 4 3 PTT

10 9 9 10 13 ANALOG 1

11 8 8 11 11 ANALOG 2

17 2 4 15 8 FLT A+

18 1 1 18 14 ON OFF CONTROL

8 11 14 5 5 LCD CLCK BUF

6 13 13 6 6 SPI DATA BUF

5 14 3 16 15 LED CLCK BUF

7 12 12 7 1 GND

16 3 10 9 4 MIC

3 16 6 13 9 HOOK

12 7 7 12 7 LED CE

Theory of Operation

4C.1-6 Introduction/Theory of Operation

PCB/Schematic Diagram and Parts List 4C.2-i

Chapter 4C.2

PCB/Schematic Diagram and Parts List

Table of Contents

Description Page

HHCM GMN6151 - Diagrams and Parts Lists

PCB Layout Component Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

PCB Layout Solder Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table of Contents

4C.2-ii PCB/Schematic Diagram and Parts List

Hand Held Control Microphone GMN6151 PCB No. 8402694Y03_T1

Diagrams and Parts List 4C.2-1

Hand Held Control Microphone GMN6151

PCB No. 8402694Y03_T1

C0901

C0902

C0903

C0904

C0905

C0906

C0907

C0908

C0909

C0910

C0911

C0912

C0913

C0920

C0921

C0922

C0923

C0924

C0925

C0926

C0927

C0928

C0929

C0931

C0941

C0951

C0971

C0972

C0973

C0974

C0975

C0976

C0981

C0982

C0983

C0984

C0985

D0971

J0901

J0902

J0903

PB0901

PB0951 PB0952 PB0971

Q0901

Q0902

Q0971

Q0972

Q0981

Q0982

Q0983

Q0984

Q0985

Q0986

R0901

R0902

R0903

R0904

R0906

R0907

R0908

R0909

R0910

R0911

R0912

R0913

R0921

R0922

R0923

R0935

R0936

R0937

R0938

R0945

R0946

R0947

R0948

R0951

R0952

R0953

R0954

R0955

R0956R0957

R0958

R0959

R0960

R0961

R0962

R0964

R0966

R0971

R0972

R0973

R0974

R0981

R0982

R0983

R0984

R0985

R0986

R0987

R0988

R0989

R0990

R0991

R0992

R0993

R0994

R0995

R0996

R0997

R0998

R0999

U0971

U0981

U0982

U0983

VR0901

VR0921

VR0922

VR0924

VR0925

VR0926

VR0927 VR0928

VR0929

177

MIC

Solder Side 8402694Y03 GEPD5518-1

Bottom Side

121

PB0944

PB0931 PB0932

PB0943

PB0933 PB0934

PB0942 PB0954

PB0941 PB0953

JU0951

JU0954

JU0956

JU0955

JU0960

JU0957

JU0958

JU0959

D0981

D0982

D0983

D0990 D0991

D0992 D0993

H0901

D0984

D0985

D0986

D0987

D0988

D0989

JU0953

JU0952

Component Side 8402694Y03 GEPD5517-1

Top Side

Hand Held Control Microphone GMN6151 PCB No. 8402694Y03_T1

4C.2-2 Diagrams and Parts List

Hand Held Control Microphone GMN6151 Schematic Diagram

Diagrams and Parts List 4C.2-3

Hand Held Control Microphone GMN6151 Schematic Diagram

GEPD5516-1

6.42V

5.9V 5.56V

3.23V

5.48V

3.24V

Hand Held Control Microphone GMN6151 Schematic Diagram

4C.2-4 Diagrams and Parts List

Hand Held Control Microphone

Parts List

Circuit

Ref

Motorola

Part No.

Descritpion

C0901 2113741F17 470pF 50V

C0903 2113743A19 100nF 16V

C0904 2113741F25 1nF 50V

C0905 2113741F25 1nF 50V

C0906 2311049A63 TANT CP 10uF 10% 10V

C0907 2311049A63 TANT CP 10uF 10% 10V

C0908 2113741F25 1nF 50V

C0909 2113741F25 1nF 50V

C0910 2113741F49 10nF 50V

C0911 2113743K07 47nF 16V Y5V

C0912 2113741F25 1nF 50V

C0913 2113740F36 24pF 5% 50V

C0920 2113741F17 470pF 50V

C0921 2113741F25 1nF 50V

C0922 2113743A19 100nF 16V

C0923 2113741F17 470pF 50V

C0924 2113741F49 10nF 50V

C0925 2113741F49 10nF 50V

C0926 2113741F17 470pF 50V

C0927 2113741F17 470pF 50V

C0928 2113741F17 470pF 50V

C0929 2113741F17 470pF 50V

C0931 2113741F17 470pF 50V

C0941 2113741F17 470pF 50V

C0951 2113741F17 470pF 50V

C0971 2113741F17 470pF 50V

C0972 2113743A19 100nF 16V

C0973 2113743A19 100nF 16V

C0974 2113741F49 10nF 50V

C0975 2311049A63 TANT CP 10uF 10% 10V

C0976 2113743A19 100nF 16V

C0981 2113743A19 100nF 16V

C0982 2113741F49 10nF 50V

C0983 2311049J23 TANT CP 10uF 10% 6V

C0984 2113743A19 100nF 16V

C0985 2113743A19 100nF 16V

D0971 4813833C02 DUAL SOT MMBD6100

D0981 4805729G73 LED SMT YEL HP

D0982 4805729G74 LED SMT RED HP

D0983 4805729G75 LED SMT GREEN HP

D0984 4805729G75 LED SMT GREEN HP

D0985 4805729G75 LED SMT GREEN HP

D0986 4805729G75 LED SMT GREEN HP

D0987 4805729G75 LED SMT GREEN HP

D0988 4805729G75 LED SMT GREEN HP

D0989 4805729G75 LED SMT GREEN HP

D0990 4805729G75 LED SMT GREEN HP

D0991 4805729G75 LED SMT GREEN HP

D0992 4805729G75 LED SMT GREEN HP

D0993 4805729G75 LED SMT GREEN HP

J0901 2809926G05 CONN 1.25MM 15PIN

J0902 2809926G01 CONN 1.25MM 2PIN

J0903 2809926G01 CONN 1.25MM 2PIN

PB0901 4005840X02 SWITCH

PB0951 4005840X02 SWITCH

PB0952 4005840X02 SWITCH

PB0971 4005840X02 SWITCH

Q0901 4813824A10 NPN 40V .2A B=50-150

Q0902 4813824A10 NPN 40V .2A B=50-150

Q0971 4880048M01 NPN DIG 47k/47k

Q0972 4880048M01 NPN DIG 47k/47k

Q0981 4880048M01 NPN DIG 47k/47k

Q0982 4813824A10 NPN 40V .2A B=50-150

Q0983 4813824A10 NPN 40V .2A B=50-150

Circuit

Ref

Motorola

Part No.

Descritpion

Q0984 4813824A10 NPN 40V .2A B=50-150

Q0985 4813824A10 NPN 40V .2A B=50-150

Q0986 4813824A10 NPN 40V .2A B=50-150

R0901 0662057A01 10 1/16W 5%

R0902 0662057A09 22 1/16W 5%

R0903 0662057A51 1k2 1/16W 5%

R0904 0662057A51 1k2 1/16W 5%

R0906 0662057A47 820 1/16W 5%

R0907 0662057A75 12k 1/16W 5%

R0908 0662057B10 330k 1/16W 5%

R0909 0662057B02 150k 1/16W

R0910 0662057A65 4k7 1/16W 5%

R0911 0662057A57 2k2 1/16W 5%

R0912 0662057A43 560 1/16W 5%

R0913 0662057A43 560 1/16W 5%

R0921 0680194M07 18 1W 5%

R0922 0680194M07 18 1W 5%

R0935 0662057A65 4k7 1/16W 5%

R0936 0662057A65 4k7 1/16W 5%

R0937 0662057A65 4k7 1/16W 5%

R0938 0662057A65 4k7 1/16W 5%

R0945 0662057A65 4k7 1/16W 5%

R0946 0662057A65 4k7 1/16W 5%

R0947 0662057A65 4k7 1/16W 5%

R0948 0662057A65 4k7 1/16W 5%

R0955 0662057A65 4k7 1/16W 5%

R0958 0662057A65 4k7 1/16W 5%

R0964 0662057A65 4k7 1/16W 5%

R0966 0662057A65 4k7 1/16W 5%

R0971 0662057A65 4k7 1/16W 5%

R0972 0662057A65 4k7 1/16W 5%

R0973 0662057A89 47k 1/16W 5%

R0974 0662057A73 10k 1/16W 5%

Circuit

Ref

Motorola

Part No.

Descritpion

R0981 0662057A97 100k 1/16W

R0982 0662057A73 10k 1/16W 5%

R0983 0662057A89 47k 1/16W 5%

R0984 0662057C63 330 1/10W 5%

R0985 0662057A89 47k 1/16W 5%

R0986 0662057C63 330 1/10W 5%

R0987 0662057C63 330 1/10W 5%

R0988 0662057A89 47k 1/16W 5%

R0989 0662057C63 330 1/10W 5%

R0990 0662057C63 330 1/10W 5%

R0991 0662057A89 47k 1/16W 5%

R0992 0662057C63 330 1/10W 5%

R0993 0662057A89 47k 1/16W 5%

R0994 0662057A51 1k2 1/16W 5%

R0995 0662057A73 10k 1/16W 5%

R0997 0662057A73 10k 1/16W 5%

R0998 0660076A25 100 0.125W 5%

R0999 0660076A25 100 0.125W 5%

U0971 5105469E65 IC VLTG REGLTR LP2951C

U0981 5105625U61 IC LCD DRIVER

33 SEGMENT STATIC

U0982 5105625U62 IC XOR QUAD - INPUT

U0983 5113806A35 MC14094, REG, 8-

STAGE,SHIFT/STORE

VR0901 4813830A27 14V 5% 225mW

VR0921 4813830A15 5.6V 5% 225mW

VR0922 4813830A27 14V 5% 225mW

VR0924 4813830A27 14V 5% 225mW

VR0925 4813830A27 14V 5% 225mW

VR0927 4813830A15 5.6V 5% 225mW

VR0928 4813830A15 5.6V 5% 225mW

VR0929 4813830A15 5.6V 5% 225mW

Circuit

Ref

Motorola

Part No.

Descritpion

Motorola GM950 User manual

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