2024年3月25日发(作者：宜弘文)
s 3 digit, 7 segment Backlit LCD display
s8 LCD Annunciators/Icons
s 3 LEDs (Red, Y ellow, Green)
s Up/Down keys for Channel Increment/Decrement
s 6 Dealer Programmable Option Buttons
s Internal 4W Loudspeaker
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 3205932V01Frame LCD
0702643Y01
Connector Elastromeric
2802638Y04 top
2802638Y03 bottom
GEPD5493
Introduction/Theory of Operation4B.1-1
3.0Theory of Operation
3.1General
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 channel number, select code.
3.2Power 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.
3.3Power 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 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.
3.4Keypad Keys
The Control Head keypad is an (11) - key keypad. All keys are con?gured 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 µP and specify the pressed
button.
3.5Status 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 µP 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. T o update the LED status line LED CLCK BUF shifts the data of line SPI DA TA
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.
4B.1-2Introduction/Theory of Operation
Theory of Operation
3.6Liquid 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
DA TA 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.
3.7Microphone 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) .
3.8Speaker
The Control Head contains a speaker for the receiver audio. The receiver audio signal from the
differential audio output of the audio ampli?er 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) .
3.9Electrostatic 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.
3.10Reversible Control Head
The control head is connected to the RF transceiver by means of a short ?exible 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 ef?cient
cooling orientation and still have the user interface the “right way” up.
Introduction/Theory of Operation4B.1-3
4B.1-4Introduction/Theory of Operation
Table of Contents
Chapter 4B.2
PCB/Schematic Diagram and Parts List
T able 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
PCB/Schematic Diagram and Parts List4B.2-i
Table of Contents
4B.2-ii PCB/Schematic Diagram and Parts List
Control Head (N3) PCB No. 8402622Y04_T2
PCB No. 8402622Y04_T2 Diagrams and Parts List4B.2-1
Control Head (N3) PCB No. 8402622Y04_T2
4B.2-2Diagrams and Parts List
Control Head (N3) Schematic Diagram
Diagrams and Parts List4B.2-3
Control Head (N3) Schematic Diagram
4B.2-4Diagrams and Parts List
Control Head (N3)Parts List
Circuit Ref
Motorola Part No.
Description
C0901*******F17470pF 50V C0902*******F17470pF 50V C0934*******K15100nF 16V C0935*******F4910nF 50V
C0941*******K15100nF 16V
CJ23T ANT CP 10uF 10% 6V DC02DUAL SOT MMBD6100D0941*******G73LED SMT YEL
DG73LED SMT YEL D0943*******G74LED SMT RED DG75LED SMT GREEN D0951-
DG75LED SMT GREEN H0931*******Y01CNTL K DISPLAY J0901*******Y01CONN FLEX Side Entry
J0902*******G01CONN 1.25MM CTR SUR J0903*******V01CONNECTOR MIC QM01NPN DIG 47k/47k
Q0931*******M16PNP SOT MMBT3906Q0941*******M01NPN DIG 47k/47k QA10NPN 40V .2A B=50-
150Q0943*******A10NPN 40V .2A B=50-150QA10NPN 40V .2A B=50-150Q0951*******A10NPN 40V .2A
B=50-150
Q0952*******A20R0901*******A35270 5 1/8R0902*******A491k 1/16W 5%R0911-RA654k7 1/16W
5%RA654k7 1/16W 5%RA654k7 1/16W 5%R0931
0662057A65
4k7 1/16W 5%
R0932
0662057A7310k 1/16W 5%R0933*******A97100k 1/16W R0941*******A7310k 1/16W 5%RA8947k 1/16W
5%R0943*******A8947k 1/16W 5%RA35270 5 1/8RA8947k 1/16W 5%RA41470
1/16W 5%RA8947k 1/16W 5%RA35270 5 1/8R0952*******A8020k 1/16W
5%R0953*******A7310k 1/16W 5%R0954*******M0110 1W 5%
U0932*******U61LCD DRIVER
33 SEGMENT ST A TIC U0941*******A35MC14094, REG,
8-ST AGE,SHIFT/STOREU VR0901*******A14 5.1V 5% 225mW VR0902*******A14 5.1V 5% 225mW VR0903*******A2714V
5% 225mW VRA2714V 5% 225mW VRA2714V 5% 225mW VR0906*******A14 5.1V 5% 225mW
VRA14 5.1V 5% 225mW VR0908
4813830A14
5.1V 5% 225mW
Circuit Ref
Motorola Part No.
Description
2024年3月25日发(作者：宜弘文)
s 3 digit, 7 segment Backlit LCD display
s8 LCD Annunciators/Icons
s 3 LEDs (Red, Y ellow, Green)
s Up/Down keys for Channel Increment/Decrement
s 6 Dealer Programmable Option Buttons
s Internal 4W Loudspeaker
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 3205932V01Frame LCD
0702643Y01
Connector Elastromeric
2802638Y04 top
2802638Y03 bottom
GEPD5493
Introduction/Theory of Operation4B.1-1
3.0Theory of Operation
3.1General
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 channel number, select code.
3.2Power 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.
3.3Power 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 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.
3.4Keypad Keys
The Control Head keypad is an (11) - key keypad. All keys are con?gured 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 µP and specify the pressed
button.
3.5Status 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 µP 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. T o update the LED status line LED CLCK BUF shifts the data of line SPI DA TA
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.
4B.1-2Introduction/Theory of Operation
Theory of Operation
3.6Liquid 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
DA TA 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.
3.7Microphone 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) .
3.8Speaker
The Control Head contains a speaker for the receiver audio. The receiver audio signal from the
differential audio output of the audio ampli?er 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) .
3.9Electrostatic 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.
3.10Reversible Control Head
The control head is connected to the RF transceiver by means of a short ?exible 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 ef?cient
cooling orientation and still have the user interface the “right way” up.
Introduction/Theory of Operation4B.1-3
4B.1-4Introduction/Theory of Operation
Table of Contents
Chapter 4B.2
PCB/Schematic Diagram and Parts List
T able 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
PCB/Schematic Diagram and Parts List4B.2-i
Table of Contents
4B.2-ii PCB/Schematic Diagram and Parts List
Control Head (N3) PCB No. 8402622Y04_T2
PCB No. 8402622Y04_T2 Diagrams and Parts List4B.2-1
Control Head (N3) PCB No. 8402622Y04_T2
4B.2-2Diagrams and Parts List
Control Head (N3) Schematic Diagram
Diagrams and Parts List4B.2-3
Control Head (N3) Schematic Diagram
4B.2-4Diagrams and Parts List
Control Head (N3)Parts List
Circuit Ref
Motorola Part No.
Description
C0901*******F17470pF 50V C0902*******F17470pF 50V C0934*******K15100nF 16V C0935*******F4910nF 50V
C0941*******K15100nF 16V
CJ23T ANT CP 10uF 10% 6V DC02DUAL SOT MMBD6100D0941*******G73LED SMT YEL
DG73LED SMT YEL D0943*******G74LED SMT RED DG75LED SMT GREEN D0951-
DG75LED SMT GREEN H0931*******Y01CNTL K DISPLAY J0901*******Y01CONN FLEX Side Entry
J0902*******G01CONN 1.25MM CTR SUR J0903*******V01CONNECTOR MIC QM01NPN DIG 47k/47k
Q0931*******M16PNP SOT MMBT3906Q0941*******M01NPN DIG 47k/47k QA10NPN 40V .2A B=50-
150Q0943*******A10NPN 40V .2A B=50-150QA10NPN 40V .2A B=50-150Q0951*******A10NPN 40V .2A
B=50-150
Q0952*******A20R0901*******A35270 5 1/8R0902*******A491k 1/16W 5%R0911-RA654k7 1/16W
5%RA654k7 1/16W 5%RA654k7 1/16W 5%R0931
0662057A65
4k7 1/16W 5%
R0932
0662057A7310k 1/16W 5%R0933*******A97100k 1/16W R0941*******A7310k 1/16W 5%RA8947k 1/16W
5%R0943*******A8947k 1/16W 5%RA35270 5 1/8RA8947k 1/16W 5%RA41470
1/16W 5%RA8947k 1/16W 5%RA35270 5 1/8R0952*******A8020k 1/16W
5%R0953*******A7310k 1/16W 5%R0954*******M0110 1W 5%
U0932*******U61LCD DRIVER
33 SEGMENT ST A TIC U0941*******A35MC14094, REG,
8-ST AGE,SHIFT/STOREU VR0901*******A14 5.1V 5% 225mW VR0902*******A14 5.1V 5% 225mW VR0903*******A2714V
5% 225mW VRA2714V 5% 225mW VRA2714V 5% 225mW VR0906*******A14 5.1V 5% 225mW
VRA14 5.1V 5% 225mW VR0908
4813830A14
5.1V 5% 225mW
Circuit Ref
Motorola Part No.
Description