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

Control Head for Radio Model N3 4B-i

Chapter 4B

Control Head for Radio Model N3

Table of Contents

Chapter

4B.1 Introduction/Theory of Operation

4B.2 PCB/Schematic Diagram and Parts List

Table of Contents

4B-ii Control Head for Radio Model N3

Introduction/Theory of Operation 4B.1-i

Chapter 4B.1

Introduction/Theory of Operation

Table of Contents

Paragraph Page

1.0 Introduction

................................................................................................ 1

2.0 Exploded View Diagram

............................................................................ 1

3.0 Theory of Operation

.................................................................................. 2

Table of Contents

4B.1-ii Introduction/Theory of Operation

Overview

Introduction/Theory of Operation 4B.1-1

1.0 Overview

128 Channel, Radio Model N3 Control Head

The features of the N3 radio control head are as follows:

■

■■

On/Off Button

■

■■

Rocker Type Volume Up/Down Control

■

■■

3 digit, 7 segment Backlit LCD display

■

■■

8 LCD Annunciators/Icons

■

■■

3 LEDs (Red, Yellow, Green)

■

■■

Up/Down keys for Channel Increment/Decrement

■

■■

6 Dealer Programmable Option Buttons

■

■■

Internal 4W Loudspeaker

2.0 Exploded View Diagram

Housing incl.

LCD Gasket

1502612Y01

LCD

7202695Y01 (5 Tone)

7202662Y01 (MPT /

Conventional)

Keypad

7502615Y01 (MPT)

7502615Y02 (Conventional)

7502615Y04 (5 Tone)

Printed Circuit Board

8402622Y_

Speaker

5005156Z02

and

Gasket

3205932V01

Frame LCD

0702643Y01

Connector Elastromeric

2802638Y04 top

2802638Y03 bottom

GEPD5493

Theory of Operation

4B.1-2 Introduction/Theory of Operation

3.0 Theory of Operation

3.1 General

The Control Head contains the internal speaker, the microphone connector, several buttons to

operate the radio, and several indicator Light Emitting Diodes (LED) to inform the user about the

radio status.

Additionally, the control head uses a 3 digit / 7 segment Liquid Crystal Display (LCD) for the

numerical information e.g. channel number, select code.

3.2 Power Supplies

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

J0901 pin 2 and the regulated +5V via connector J0901 pin 10. The voltage FLT A+ is at battery

level and is used for the LEDs, the back light and to power up the radio via the On / Off button. The

stabilized +5 volt is used for the display, the display driver, the shiftregister and the keypad buttons.

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 (D0925) and connects the base of (Q0925) to FLT A+. This transistor pulls the

line ANALOG 3 to low to inform the

P that the On/Off button is pressed. If the radio is switched off,

the

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.

3.4 Keypad Keys

The Control Head keypad is an (11) - key keypad. All keys are conﬁgured as 3 analogue lines

(ANALOG 1 2 3) to the radio. Lines ANALOG 1,2 each control four keys; line ANALOG 3 controls

three 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 3 lines ANALOG 1,2,3 to a

resistive voltage divider connected to +5V. The voltages of the lines are A/D converted inside the

and specify the pressed button.

3.5 Status LED and Back Light Circuit

All the indicator LEDs (4) and the back light LEDs (20) are driven by current sources (Q0942 -

Q0944, Q0951, Q0952) and controlled by the

P via SERIAL PERIPHERAL INTERFACE (SPI). The

current is determined by the resistor at the emitter of the respective current source transistor.

Shiftregister (U0941) 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.

Theory of Operation

Introduction/Theory of Operation 4B.1-3

3.6 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 into the display driver by clock signal LCD CLCK BUF. When the last bit

has been received, the LCD display is updated.

3.7 Microphone Connector

Signals BUS+, PTT, HOOK VPP, MIC HI, HANDSET AUDIO from the microphone connector (J0903)

are fed to the radio’s controller section via connector (J0901) .

3.8 Speaker

The Control Head 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 (J0901-18,17) to the speaker connector (J0902) pin 1 and pin 2. The

speaker is connected to the connector (J0902) .

3.9 Electrostatic Transient Protection

Electrostatic transient protection is provided for the sensitive components in the Control Head by

diodes (VR0901 - VR0909). The diodes limit any transient voltages to tolerable levels. The

associated capacitors provide Radio Frequency Interference (RFI) protection.

3.10 Reversible Control Head

The control head is connected to the RF transceiver by means of a short ﬂexible ribbon cable. This

allows the control head to be mounted either way up in relation to the body of the transceiver. This

means that the transceiver can be mounted in the most cosmetically pleasing and most efﬁcient

cooling orientation and still have the user interface the “right way” up.

Theory of Operation

4B.1-4 Introduction/Theory of Operation

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

Chapter 4B.2

PCB/Schematic Diagram and Parts List

Table of Contents

Description Page

Control Head (N3) - Diagrams and Parts Lists

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

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

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

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

Table of Contents

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

Control Head (N3) PCB No. 8402622Y04_T2

Diagrams and Parts List 4B.2-1

Control Head (N3)

PCB No. 8402622Y04_T2

C0901

C0902

C0903

C0904

C0905

C0906

C0911

C0915

C0925

C0926

C0934

C0935

C0941

C0942

D0925

J0901

J0902

Q0925

Q0941

Q0942

Q0943

Q0944

Q0951

Q0952

R0901

R0911

R0912

R0913

R0914

R0915

R0916

R0917

R0918

R0919

R0920

R0921

R0922

R0925

R0926

R0933

R0941

R0942

R0943

R0944

R0945

R0946

R0947

R0948

R0951

R0952

R0953

R0954

U0932

U0941

VR0901

VR0902

VR0903

VR0904

VR0905

VR0906

VR0907

VR0908

VR0909

Solder Side 8402622Y04 GEPD5399

Bottom Side

D0941

D0942

D0943

D0944

D0951

D0952

D0953

D0954

D0955

D0956

D0957

D0958

D0959

D0960

D0961

D0962

D0963

D0964

D0965

D0966

D0967

D0968

D0969

D0970

H0931

J0903

R0902

Top Side

Control Head (N3) PCB No. 8402622Y04_T2

4B.2-2 Diagrams and Parts List

Control Head (N3) Schematic Diagram

Diagrams and Parts List 4B.2-3

Control Head (N3) Schematic Diagram

BPO

BP I

B10

B11

B12

B13

B14

B15

B16

B17

B18

B19

B29

B20

B21

B22

B23

B24

B25

B26

B27

B28

B30

B31

B32

B33

Control Head (N3) Schematic Diagram

4B.2-4 Diagrams and Parts List

Control Head (N3)

Parts List

Circuit

Ref

Motorola

Part No.

Description

C0901 2113741F17 470pF 50V

C0902 2113741F17 470pF 50V

C0934 2113743K15 100nF 16V

C0935 2113741F49 10nF 50V

C0941 2113743K15 100nF 16V

C0942 2311049J23 TANT CP 10uF 10% 6V

D0925 4813833C02 DUAL SOT MMBD6100

D0941 4805729G73 LED SMT YEL

D0942 4805729G73 LED SMT YEL

D0943 4805729G74 LED SMT RED

D0944 4805729G75 LED SMT GREEN

D0951-

D0970

4805729G75 LED SMT GREEN

H0931 7202631Y01 CNTL K DISPLAY

J0901 0902636Y01 CONN FLEX Side Entry

J0902 2809926G01 CONN 1.25MM CTR SUR

J0903 2805924V01 CONNECTOR MIC

Q0925 4880048M01 NPN DIG 47k/47k

Q0931 4805128M16 PNP SOT MMBT3906

Q0941 4880048M01 NPN DIG 47k/47k

Q0942 4813824A10 NPN 40V .2A B=50-150

Q0943 4813824A10 NPN 40V .2A B=50-150

Q0944 4813824A10 NPN 40V .2A B=50-150

Q0951 4813824A10 NPN 40V .2A B=50-150

Q0952 4813822A20

R0901 0660076A35 270 5 1/8

R0902 0662057A49 1k 1/16W 5%

R0911-

R0922

0662057A65 4k7 1/16W 5%

R0925 0662057A65 4k7 1/16W 5%

R0926 0662057A65 4k7 1/16W 5%

R0931 0662057A65 4k7 1/16W 5%

R0932 0662057A73 10k 1/16W 5%

R0933 0662057A97 100k 1/16W

R0941 0662057A73 10k 1/16W 5%

R0942 0662057A89 47k 1/16W 5%

R0943 0662057A89 47k 1/16W 5%

R0944 0660076A35 270 5 1/8

R0945 0662057A89 47k 1/16W 5%

R0946 0662057A41 470 1/16W 5%

R0947 0662057A89 47k 1/16W 5%

R0948 0660076A35 270 5 1/8

R0952 0662057A80 20k 1/16W 5%

R0953 0662057A73 10k 1/16W 5%

R0954 0680194M01 10 1W 5%

U0932 5105625U61 LCD DRIVER

33 SEGMENT STATIC

U0941 5113806A35 MC14094, REG,

8-STAGE,SHIFT/STOREU

VR0901 4813830A14 5.1V 5% 225mW

VR0902 4813830A14 5.1V 5% 225mW

VR0903 4813830A27 14V 5% 225mW

VR0904 4813830A27 14V 5% 225mW

VR0905 4813830A27 14V 5% 225mW

VR0906 4813830A14 5.1V 5% 225mW

VR0907 4813830A14 5.1V 5% 225mW

VR0908 4813830A14 5.1V 5% 225mW

Circuit

Ref

Motorola

Part No.

Description

Motorola GM950 User manual

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