HYT TM-800K Service Manual
Contents
Introduction …………………………………………………………………………………… 1
Safety Information …………………………………………………………………………… 1
Radio Overview ……………………………………………………………………………… 3
Software Specifications …………………………………………………………………… 6
Circuit Description ………………………………………………………………………… 16
Semiconductor Data ……………………………………………………………………… 21
TM-800K Parts List 1 ……………………………………………………………………… 28
Tuning Description ………………………………………………………………………… 77
Terminal Function ………………………………………………………………………… 89
Troubleshooting Flow Chart ……………………………………………………………… 92
Disassembly and Assembly for Repair ………………………………………………… 96
Exploded View ……………………………………………………………………………… 98
TM-800K Parts List 2 ……………………………………………………………………… 99
Packing ……………………………………………………………………………………… 100
Specifications ……………………………………………………………………………… 123
Appendix 1 Entering Characters ……………………………………………………… 124
TM-800K Service Manual
1
Introduction
Manual Scope
This manual is intended for use by experienced technicians familiar with similar types of
communication equipment. It contains all service information required for the equipment and is current
as of the publication date.
Safety Information
The following safety precautions shall always be observed during operation, service and repair of this
equipment.
z This equipment shall be serviced by qualified technicians only.
z Do not modify the radio for any reason.
z Use only HYT supplied or approved antenna.
z Gain of antenna must not exceed 3dBi for VHF or 5.5dBi for UHF.
z Mobile antenna Installation: Install the mobile antenna at least 82cm (32 inches) away from your
body, in accordance with the requirements of the antenna manufacturer/supplier.
z Transmit only when people inside and outside the vehicle are at least the minimum distance away
from a properly installed, externally mounted antenna.
z Mobile antenna substitution: Don’t substitute HYT supplied or approved antenna, or excessive
radio frequency radiation will result. Please contact your dealer or the manufacturer for further
instructions.
z Please make sure there’s no stress on the antenna joint during transportation or installation.
z To avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any area
where posted notices instruct you to do so. Hospital or health facilities may be using equipment
that is sensitive to external RF energy.
z For vehicles with an air bag, do not place a radio in the area over an air bag or in the air bag
deployment area.
z Turn off your radio prior to entering any area with explosive and flammable materials.
z Do not expose the radio to direct sunlight over a long time, nor place it close to heating source.
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▇ Operation Guidelines
For vehicles equipped with electronic anti-skid braking systems, electronic ignition systems or
electronic fuel injection systems, interferences may occur during radio transmission. If the foregoing
electronic equipments are installed on your vehicle, please contact your dealer for further assistance to
make sure that radio transmission will not interfere with these equipments.
For radio installation in vehicles fueled by LP gas with LP gas container within interior of the vehicles,
the following precautions are recommended for personal safety.
1. Any space containing radio equipment shall be isolated by a seal from the space in which the LP
gas container and its fittings are located.
2. Remote (outside) fitting connections shall be used.
3. Good ventilation is required for the container space.
▇ Installation Guidelines
z Vehicle installation: The antenna can be mounted at the center of a vehicle metal roof or trunk lid if
the minimum safe distance is observed.
z Do not mount the mobile radio overhead or on a sidewall unless you take special precautions.
z If the mobile radio is not properly installed, road shock could bump the radio loose, and the falling
radio could, in some circumstances, cause serious injury to the driver or a passenger. In case of
vehicle accidents, even when properly installed, the radio could break loose and become a
dangerous projectile.
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Radio Overview
Front Panel View
1. Programmable Function Keys ( [ PF1 ] through [ PF6 ] )
Your dealer can program these keys as shortcuts to various radio features.
2. Microphone Jack
Plug a 6-pin connector into the jack.
3. Power Switch / Selector Knob
Press the power switch to turn the radio on/off.
The knob may be programmed by your dealer to select Volume Up / Down, Channel Up / Down,
and Zone Up / Down.
Turn the knob clockwise to adjust upwards and counter-clockwise to adjust downwards.
4. LCD Display
Please refer to the section “ LCD Display ”.
5. [ ▲ ] ( Up ) / [ ▼ ] ( Down ) Key
The keys may be programmed by your dealer to select Volume Up / Down, Channel Up / Down,
and Zone Up / Down.
6. LED Display
Used to display the operating status of main unit. Please refer to the section of “ LED Display ”.
7. Numeric Keys and Function Keys
TM-800K Service Manual
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Used when you select channel or transmit selective call etc.
8. Speaker
Used to output audio.
Microphone
LCD Display
Indicator Description
1. Display zone / channel number.
2. Display zone / channel alias ( up to 12 alphanumeric characters ).
3. Display channel frequency
4. Display the preprogrammed function
1. Display zone / channel number.
2. Display transmit power level ( H, M or L ).
3. Display the preprogrammed function.
Appears when the current channel is busy.
Appears when the Monitor key is pressed to monitor channel activities or
during a selective call.
Appears when Monitor key is pressed to unmute the speaker.
A
Appears when DTMF Live Dial mode or DTMF Keypad mode is enabled.
SCAN Appears while scanning.
CALL Appears when transmitting a selective call.
Appears when Scrambler is enabled
Appears when Compandor is enabled
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Rear Panel View
1. DB15
Further development interface.
2. DC power jack
Used to connect 13.6V DC power.
3. Fuse of DC power
4. Grounding terminal
5. Switch of AC power
6. Fuse of AC power
7. AC power jack
8. Antenna connector
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Software Specifications
Radio Modes
Frame of Radio Modes
Keypad Entry for Mode Startup
MODE Main Menu Display/Sub Menu Operation Remarks
USER MODE Conventional Mode -------------------------------
Turn on the radio to enter
Conventional Mode
Test Mode -------------------------------
Adjust Mode -------------------------------
TEST &
ADJUST
MODE
Model Set Mode -------------------------------
While holding down [ PF2 ] key,
turn on the radio
Firmware Version Display Mode -------------------------------
While holding down [ PF3 ] key,
turn on the radio
Firmware Programming Mode -------------------------------
While holding down [ PF4 ] key,
turn on the radio
Wired Clone Mode -------------------------------
While holding down [ PF5 ] key,
turn on the radio
PC Programming Mode ------------------------------- Receive commands from PC
Note: When power-on password is enabled, you must input the correct password before you can
enter User Mode.
You can input password through the keypad and press [ # ] to clear.
Error Information and Measures in User Mode
The radio self-checks when power on. If no error is detected, the radio enters conventional mode.
While the radio will sound alert once any error is checked.
Firmware Programming Mode
PC Programming Mode
Clone Mode Wired Clone Mode
User Mode
Conventional Mode
Model Set Mode
Test & Adjust Mode
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Error information and measures:
No. Error Information LCD Display Measures
1 Stun status Stun Re-program.
2 Data and Firmware Version
mismatch
No Data
Re-program with programming software of right
version.
Firmware Programming Mode
The built-in FLASH ROM enables user to add new functions simply by upgrading.
(1) Turn on the radio while holding down [ PF4 ] simultaneously to enter Firmware Programming
Mode, “ PC Program ” appears on the LCD.
(2) Run the programming software.
(3) Connect the radio with a PC by programming cable.
(4) Select the corresponding COM port, and then click “ Download ”.
(5) When data is successfully written into the radio, click “ OK ” to exit.
(6) Repeat step 1 through 5 to program another radio.
Note: The radio can’t enter the Firmware Programming Mode if it is disabled by your dealer.
It can be set ON only after being programmed through the programming software.
Firmware Version Display Mode
Turn the radio on while holding down [ PF3 ] to enter Firmware Version Display Mode, the firmware
version will be displayed on the LCD.
Release [ PF3 ] to enter User Mode.
PC Mode
Connect the radio with a PC by programming cable. If data is written to the radio from PC, it can be
programmed into the FLASH. Data programming is accessible by programming software.
When data is written to the radio from PC, “ PROGRAMMING ” appears on the LCD. LED glows green
when data is written to the radio and red when data is read from the radio. Radio will restart automati-
cally when programming is completed.
Wired Clone Mode
Data can be transmitted from radio to radio by wired cloning.
(1) Turn on the source radio while holding down [ PF5 ] simultaneously, the radio enters Clone
Mode with “CLONE” on the LCD, or enters User Mode if Clone Mode is disabled by your dealer.
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(2) Press [ PF2 ] to toggle between Dealer Clone and Factory Clone Mode. “Dealer Clone” or
“Factory Clone” appears on the display when the corresponding mode is selected. The radio
restores the original display after 5 seconds.
Unlike Factory Clone Mode, tuning settings and embedded messages are not covered in Dealer
Clone Mode.
Dealer Clone Mode is the default mode.
(3) Connect the two radios by clone cable, and then turn on the target radio.
(4) Press [ PF6 ] to start cloning, the LED of source radio glows red and that of target radio glows
green during cloning. “PROGRAMMING” is also displayed on the target radio. “END” appears on
the source radio when cloning is completed and the target radio displays “END” when all data is
received.
(5) Press [ PF6 ] to return to Clone Mode. “CLONE” appears on the source radio. Repeat the above
steps to continue wired cloning.
Note: Cloning is available only when both radios are in the same mode.
Test Mode
1. Turn the radio on while holding down [ PF2 ], the radio enters Test Mode. Test frequency channel
and signalling test channel are displayed.
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In this mode, the channel frequency ( center, low, high ) can be modified through the programming
software.
Test frequency channels are shown in the following table:
Model RX / TX CH1 ( C ) CH 2 ( L ) CH 3 ( H ) CH 4 CH 5 CH 6 CH 7 CH 8
RX(MHz)
155.15
136.15 173.85 145.55 164.55 155.00 155.20 155.40136-174M
(V)
TX(MHz) 155.00 136.00 174.00 145.50 164.50 155.00 155.20 155.40
RX(MHz)
481.15 450.15
511.85
465.55
496.55
481.00 481.20 481.40
450-512M
(U2)
TX(MHz)
481.00 450.00 512.00
465.50
496.50 481.00 481.20 481.40
RX(MHz)
375.15 350.15 399.85
362.55
387.55 375.00 375.20 375.40
350-400M
(U5)
TX(MHz)
375.00 350.00 400.00
362.50
387.50 375.00 375.20 375.40
RX(MHz)
435.15 400.15 469.85
417.55
452.55 435.00 435.20 435.40
400-470M
(U1)
TX(MHz)
435.00 400.00 470.00
417.50
452.50 435.00 435.20 435.40
RX(MHz) 465.15 440.15 489.85 452.55 477.55 465.00 465.20 465.40440-490M
(U4)
TX(MHz) 465.00 440.00 490.00 452.50 477.50 465.00 465.20 465.40
RX(MHz)
503.15 480.15 525.85
491.75
515.25 503.00 503.20 503.40
480-526M
(U3)
TX(MHz)
503.00 480.00 526.00
491.70
515.20 503.00 503.20 503.40
RX(MHz) 425.15 400.15 449.85 412.55 437.55 425.00 425.20 425.40400-450M
(U6)
TX(MHz) 425.00 400.00 450.00 412.50 437.50 425.00 425.20 425.40
RX(MHz) 485.15 450.15 519.85 467.55 502.55 485.00 485.20 485.40450-520M
(U7)
TX(MHz) 485.00 450.00 520.00 467.50 502.50 485.00 485.20 485.40
Signallings are shown as follows:
No. RX TX Description
1 None None
2 None 100Hz square wave
3 CTCSS 67.0Hz CTCSS 67.1Hz
4 CTCSS 151.4Hz CTCSS 151.4Hz
5 CTCSS 210.7Hz CTCSS 210.7Hz
6 CTCSS 250.3Hz CTCSS 250.3Hz
7 CDCSS 023N CDCSS 023N
8 CDCSS 754I CDCSS 754I
9 None DTMF (159D)
10 None DTMF 9
11 None 5-Tone ( 037BC ( EEA ) )
12 None Single tone 1200Hz
13 None Single tone 1000Hz
14 None None
2. In Test Mode, the following functions can be accomplished by key press:
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Key Function Description
Up Volume Up
Down Volume down
PF1 Wide/Medium/Narrow band
PF2 Squelch Open / Close
“
” icon appears when squelch is open.
PF3 Test Mode / Adjust Mode
PF4 Activate compandor function
PF1: enable / disable compandor
PF2: enable / disable clock shift
PF3: 1200 / 2400bps MSK
PF5 Signalling Up
PF6 Signalling Down
Selector Knob Channel Up/Down
In Test Mode, press [ PF4 ], then press the following key to enable the corresponding functions.
PF1 Enable / disable Compandor “ ▼ ” icon appears when compandor is enabled
PF2 Enable / disable Clock Shift “ A ” icon appears when clock shift is enabled
PF3 1200 / 2400bps MSK “ ” icon appears when 2400bps is selected
PF4 Return to Test Mode
PF5 None
PF6 None
3. In Test Mode, press [ PF3 ] to enter Adjust Mode. Turn the Selector Knob to choose your desired
setting items.
No. Adjust Item LCD Display
1 Frequency stability Frequency
2 TX power Tx Power
3 Max. deviation Max.Deviate
4 CDCSS balance CDCSSBalance
5 CTCSS deviation CTCSSDeviate
6 CDCSS deviation CDCSSDeviate
7 DTMF deviation DTMFDeviate
8 MSK deviation MSK Deviate
9 Single tone deviation Tone Deviate
10 RX sensitivity Rx Sensitivity
11 Squelch open level Open SQL
12 SQL close level Close SQL
13 Rssi High High Rssi
14 Rssi Low Low Rssi
15 DI Deviation DI Deviate
TM-800K Service Manual
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In Test Mode, user can press the following key to switch menu modes.
Press [ PF3 ] to toggle between Test Mode and Adjust Mode.
Press [ PF4 ] to toggle between Adjust Mode and Model Set Mode ( [ PF4 ] is invalid if Model
Set Mode is disabled by your dealer. Refer to Model Set Mode for details ).
Press [ PF6 ] to enter the selected mode.
4. In Adjust Mode, the following functions can be accomplished by key press.
Key Function Description
Up Volume Up
Down Volume Down
PF1 Return to Tuning Item menu
PF2 Squelch Open / Close
“
” icon appears when squelch is open.
PF4 Enter the previous item ( Down )
PF5 Enter the next item ( Up )
PF6 Save the settings, enter the next item
Selector Knob Adjust upwards / downwards
5. Setting Items (＊＊＊: 1-256)
Setting Item
Wide/ Medium/
Narrow band
Frequency Main LCD Sub LCD Description
Frequency Stability Wide Center Freq *** C No signalling
Center Hi Power *** C No signalling
Low Hi Power *** L No signalling
High Hi Power *** H No signalling
Center Mi Power *** C No signalling
Low Mi Power *** L No signalling
High Mi Power *** H No signalling
Center Lo Power *** C No signalling
Low Lo Power *** L No signalling
Tx Power High power
High Lo Power *** H No signalling
Center Max Dev *** C No signalling
Low Max Dev *** L No signalling
Wide
High Max Dev *** H No signalling
Medium Center Max Dev *** m C No signalling
Center Max Dev *** n C No signalling
Low Max Dev *** n L No signalling
Max. deviation
Narrow
High Max Dev *** n H No signalling
CDCSS Balance Wide
Center CDCSS BAL*** C
CDCSS: 023N
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Low CDCSS BAL*** L
CDCSS: 023N
High CDCSS BAL*** H
CDCSS: 023N
Medium Center CDCSS BAL*** m C
CDCSS: 023N
Center CDCSS BAL*** n C
CDCSS: 023N
Low CDCSS BAL*** n L
CDCSS: 023N
Narrow
High CDCSS BAL*** n H
CDCSS: 023N
Center 67.0 DEV*** C CTCSS: 67.0Hz
Low 67.0 DEV*** L CTCSS: 67.0Hz
Wide
High 67.0 DEV*** H CTCSS: 67.0Hz
Medium Center 67.0 DEV*** m C CTCSS: 67.0Hz
Center 67.0 DEV*** n C CTCSS: 67.0Hz
Low 67.0 DEV*** n L CTCSS: 67.0Hz
Narrow
High 67.0 DEV*** n H CTCSS: 67.0Hz
Center 151.4 DEV*** C CTCSS: 151.4Hz
Low 151.4 DEV*** L CTCSS: 151.4Hz
Wide
High 151.4 DEV*** H CTCSS: 151.4Hz
Medium Center 151.4 DEV*** m C CTCSS: 151.4Hz
Center 151.4 DEV*** n C CTCSS: 151.4Hz
Low 151.4 DEV*** n L CTCSS: 151.4HzNarrow
High 151.4 DEV*** n H CTCSS: 151.4Hz
Center 254.1 DEV*** C CTCSS: 254.1Hz
Low 254.1 DEV*** L CTCSS: 254.1Hz
Wide
High 254.1 DEV*** H CTCSS: 254.1Hz
Medium Center 254.1 DEV*** m C CTCSS: 254.1Hz
Center 254.1 DEV*** n C CTCSS: 254.1Hz
Low 254.1 DEV*** n L CTCSS: 254.1Hz
CTCSS deviation
Narrow
High 254.1 DEV*** n H CTCSS: 254.1Hz
Center CDCSS DEV*** C CDCSS: 023N
Low CDCSS DEV*** L CDCSS: 023N
Wide
High CDCSS DEV*** H CDCSS: 023N
Medium Center CDCSS DEV*** m C CDCSS: 023N
Center CDCSS DEV*** n C CDCSS: 023N
Low CDCSS DEV*** n L CDCSS: 023N
CDCSS deviation
Narrow
High CDCSS DEV*** n H CDCSS: 023N
Center DTMF DEV *** C DTMF: 9
Low DTMF DEV *** L DTMF: 9
Wide
High DTMF DEV *** H DTMF: 9
Medium Center DTMF DEV *** m C DTMF: 9
DTMF deviation
Narrow
Center DTMF DEV *** n C DTMF: 9
TM-800K Service Manual
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Low DTMF DEV *** n L DTMF: 9
High DTMF DEV *** n H DTMF: 9
Center MSK DEV *** C No signalling
Low MSK DEV *** L No signalling
Wide
High MSK DEV *** H No signalling
Medium Center MSK DEV *** m C No signalling
Center MSK DEV *** n C No signalling
Low MSK DEV *** n L No signalling
MSK deviation
Narrow
High MSK DEV *** n H No signalling
Center TONE DEV *** C 1KHz
Low TONE DEV *** L 1KHz
Wide
High TONE DEV *** H 1KHz
Medium Center TONE DEV *** m C 1KHz
Center TONE DEV *** n C 1KHz
Low TONE DEV *** n L 1KHz
Tone deviation
Narrow
High TONE DEV *** n H 1KHz
-
Low
Rx Sens. ***
L
No signal,SQL off
-
Center/
Low Rx Sens. ***
CL
No signal,SQL off
- Center
Rx Sens. ***
C
No signal,SQL off
-
High/
Center Rx Sens. ***
HC
No signal,SQL off
RX Sensitivity
-
High
Rx Sens. ***
H
No signal,SQL off
Center OpenSQL9 *** C No signalling
Low OpenSQL9 *** L No signalling
SQL 9 Wide
High OpenSQL9 *** H No signalling
SQL 9 Medium Center OpenSQL9 *** m C No signalling
Center OpenSQL9 *** n C No signalling
Low OpenSQL9 *** n L No signalling
SQL 9 Narrow
High OpenSQL9 *** n H No signalling
Center OpenSQL3 *** C No signalling
Low OpenSQL3 *** L No signalling
SQL 3 Wide
High OpenSQL3 *** H No signalling
SQL 3 Medium Center OpenSQL3 *** m C No signalling
Center OpenSQL3 *** n C No signalling
Low OpenSQL3 *** n L No signalling
SQL Open
SQL 3 Narrow
High OpenSQL3 *** n H No signalling
Center CloseSQL9*** C No signalling
SQL Close SQL 9 Wide
Low CloseSQL9*** L No signalling
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High CloseSQL9*** H No signalling
SQL 9 Medium Center CloseSQL9*** m C No signalling
Center CloseSQL9*** n C No signalling
Low CloseSQL9*** n L No signalling
SQL 9 Narrow
High CloseSQL9*** n H No signalling
Center CloseSQL3*** C No signalling
Low CloseSQL3*** L No signalling
SQL 3 Wide
High CloseSQL3*** H No signalling
SQL 3 Medium Center CloseSQL3*** m C No signalling
Center CloseSQL3*** n C No signalling
Low CloseSQL3*** n L No signalling
SQL 3 Narrow
High CloseSQL3*** n H No signalling
Center High RSSI *** C No signalling
Low High RSSI *** L No signalling
Wide
High High RSSI *** H No signalling
Medium Center High RSSI *** m C No signalling
Center High RSSI *** n C No signalling
Low High RSSI *** n L No signalling
RSSI High Level
Narrow
High High RSSI *** n H No signalling
Center Low RSSI *** C No signalling
Low Low RSSI *** L No signalling
Wide
High Low RSSI *** H No signalling
Medium Center Low RSSI *** m C No signalling
Center Low RSSI *** n C No signalling
Low Low RSSI *** n L No signalling
RSSI Low Level
Narrow
High Low RSSI *** n H No signalling
Center DI Deviate C No signalling
Low DI Deviate L No signalling
Wide
High DI Deviate H No signalling
Medium Center DI Deviate mC No signalling
Center
DI Deviate nC No signalling
Low
DI Deviate nL No signalling
DI Deviation
Narrow
High
DI Deviate nH No signalling
Model Set Mode
1. Turn the radio on while holding down [ PF2 ], the radio enters Test Mode. The test frequency
channel and signalling test channel are displayed.
2. In Test Mode, press [ PF3 ] to enter Adjust Mode.
3. In Adjust mode, press [ PF4 ] to enter Model Set Mode. “Frequency Range” is displayed.
TM-800K Service Manual
15
4. Turn the Selector Knob to choose model.
5. Press [ PF6 ] to confirm. ”Wait a second…” is displayed.
6. Press [ PF3 ] to return to Test Mode.
Notes:
1. Once the new model is set, previous channel settings ( frequency, CTCSS / CDCSS, channel
function settings ) will be deleted, and part of functions are also changed. Therefore, do not
make this operation unless it’s a must, such as changing the EEPROM or FLASH ROM, etc.
2. Initial Data Table
Model RX / TX
CH 1
(Center )
CH 2
(Low)
CH 3
(High )
CH 4 CH 5 CH 6 CH 7 CH 8
RX (MHz) 155.15 136.15 173.85 145.55 164.55 155.00 155.20 155.40
136-174M
(V)
TX (MHz) 155.00 136.00 174.00 145.50 164.50 155.00 155.20 155.40
RX (MHz) 481.15 450.15 511.85 465.55 496.55 481.00 481.20 481.40
450-512M
(U2)
TX (MHz) 481.00 450.00 512.00 465.50 496.50 481.00 481.20 481.40
RX (MHz) 375.15 350.15 399.85 362.55 387.55 375.00 375.20 375.40
350-400M
(U5)
TX (MHz) 375.00 350.00 400.00 362.50 387.50 375.00 375.20 375.40
RX (MHz) 435.15 400.15 469.85 417.55 452.55 435.00 435.20 435.40
400-470M
(U1)
TX (MHz) 435.00 400.00 470.00 417.50 452.50 435.00 435.20 435.40
RX (MHz) 465.15 440.15 489.85 452.55 477.55 465.00 465.20 465.40
440-490M
(U4)
TX (MHz) 465.00 440.00 490.00 452.50 477.50 465.00 465.20 465.40
RX (MHz) 503.15 480.15 525.85 491.75 515.25 503.00 503.20 503.40
480-526M
(U3)
TX (MHz) 503.00 480.00 526.00 491.70 515.20 503.00 503.20 503.40
RX (MHz) 425.15 400.15 449.85 412.55 437.55 425.00 425.20 425.40
400-450M
(U6)
TX (MHz) 425.00 400.00 450.00 412.50 437.50 425.00 425.20 425.40
485.15 450.15 519.85 467.55 502.55 485.00 485.20 485.40 485.15450-520M
(U7)
485.00 450.00 520.00 467.50 502.50 485.00 485.20 485.40 485.00
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Circuit Description
Frequency Configuration
The receiver utilizes double conversion superheterodyne. The first IF is 49.95MHz (VHF) / 73.05MHz
(UHF) and the second is 450 KHz. The first local oscillator signal is supplied by PLL circuit. The second
local oscillator signal (73.5MHz) of UHF model is generated from TCXO (73.5MHz); the second local
oscillator signal (50.4MHz) of VHF model is generated from the frequency tripling of TCXO (16.8MHz).
The PLL circuit also generates the frequencies needed in the transmitter ( See Fig.2 ).
Frequency Range: 136 MHz - 174MHz
U1: 400 MHz - 470MHz U2: 450 MHz - 512MHz
U3: 480 MHz - 526MHz U4: 440 MHz - 490MHz
U5: 350 MHz - 400MHz U7: 450 MHz - 520MHz
Receiver Circuit
The receiver section configuration is shown as Fig. 1.
Figure 1-a UHF Receiver Section Configuration
Figure 1-b VHF Receiver Section Configuration
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RF AMP BPF
It consists of BPF (D603, D602, and D601) and RF amplifier (Q601). The range of bandpass frequency
(V: 136 MHz - 174MHz, U1: 400 MHz - 470 MHz; U2: 450 MHz - 512MHz; U3: 480 MHz - 526MHz; U4:
440 MHz - 490MHz; U5: 350 MHz - 400MHz; U7: 450 MHz - 520MHz). The signal is filtered by the RF
Amp BPF to eliminate unwanted signals before going to the first mixer.
The First Mixer
The signal from RF AMP BPF is mixed with the first local oscillator signal from PLL circuit in the
double-balance mixer (Q138, Q144, Q145, and Q146) to generate a 73.05MHz (UHF) / 49.95MHz
(VHF) first IF signal. The first IF signal is then fed through two crystal filters (N: XF101, XF103; W:
XF102, XF104) to further remove spurious signals.
IF Amplifier
The first IF signal is amplified by Q125, Q118 and then enters IC119 (TA31136FN). The signal is mixed
with the second local oscillator signal (UHF: 73.5MHz; VHF: 50.4MHz) to create a 450 KHz second IF
signal. The second IF signal is then fed to a ceramic filter (N: CF103; W: CF104) to eliminate unwanted
signals. The resulting signal is detected by IC119 and output from Pin9 as an AF signal.
Audio Amplifier
The audio signal from IC119 is amplified by IC109 before being filtered. The resulting AF signal passes
through Q108 (AF MUTE) and IC121 (electronic switch), then is amplified by IC106 (the received
signalling is inputted into CPU for decoding) and IC104. The amplified signal is fed to IC125 (volume
control) and Q114 (SP MUTE) before entering AF AMP (IC126). The outputted AF signal is then
delivered to the speaker through control panel.
Squelch
The audio signal from IC119 is amplified by IC109 again, and then filtered to remove noise signals.
The noise signal is amplified by Q121 and rectified by D110 to produce an ASQ level. The ASQ level is
then compared in CPU (IC120) to generate a level which controls AF MUTE and SP MUTE. IC120
determines whether to output sounds from the speaker by controlling Q108, Q114.
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Transmitter Circuit
Figure 2 Transmitter Section Configuration
MIC Circuit and Modulation Circuit
The AF signal from MIC is amplified by IC104 after passing through the MIC control switch (Q507). The
resulting signal is then amplified by IC106 and pre-emphasized, encoded. It is passed to IC121 (electronic
switch) before reaching IC125. The signalling is inputted into IC125 and enters VCO for modulation.
Driver and Final-Stage Power Amplifier Circuit
TX-RF signal is outputted from Q703 in VCO circuit and amplified by Q126, Q127 and Q128. The
amplified signal is then fed to IC102 (Power Module) and passes through LPF before reaching the
antenna terminal.
APC
The APC is used to keep the power output at a constant preset value. D105 and D106 transform the
signal from detector into DC voltage which is then compared with the reference voltage from CPU in
IC118 and outputted as DC control voltage. The DC control voltage controls the output power by
controlling the grid of IC102.
PLL Circuit
PLL circuit generates the first local oscillator signal for reception and the RF signal for transmission.
PLL circuit consists of TX frequency oscillator (Q701), RX frequency oscillator (Q702), buffer amplifier
(Q703), RF amplifier (Q124), PLL IC (IC801), LPF (Q804, Q805) and TX/RX VCO control switch
(Q704, Q706).
In transmit mode, IC120 transmits the frequency data to PLL IC. Q704 is turned on to activate TX VCO.
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The outputted signal is amplified by Q703, Q124, and then divided by PLL IC into 2.5KHz, 5KHz or
6.25KHz signal. The divided signal is compared with 2.5KHz, 5KHz or 6.25KHz reference signal from
16.8MHz crystal oscillator (2.5 PPM frequency stability) in the phase comparator. The frequency control
voltage outputted from the phase comparator is sent to TX VCO after passing through LPF (Q804,
Q805). In the meantime, modulation signal (TX) is passed to TX VCO for frequency modulation.
The working principle in receive mode is similar to that in transmit mode.
Figure 3 PLL Circuit
Control Circuit
Circuit in this section is comprised of CPU, reset IC, power supply controller and flash ROM.
CPU
IC120 (CPU) operates at 9.8304MHz. It controls the data transmission between receive circuit,
transmit circuit, control circuit, display circuit and peripheral circuit.
Figure 4 Control Circuit
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Power Supply
Power supply of the radio is derived from the battery which supplies battery B+. D135 and D137 are
over-voltage protection Diodes. Power-on/off can be controlled by software.
Figure 5 Power Switch Circuit
Vout provides power supply to IC115, IC114, IC113, and IC111, which produces 8V, 9V, 5V, and 3.3V
voltage to the circuit.
Display Circuit
Display circuit is comprised of CPU (IC503), LCD module, LED and other components. Radio features
are programmable by PF1-PF6. Data is displayed on the 12-digit and 4-digit dot matrix LCD in
alphanumeric form.
Figure 6 Display Circuit
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Semiconductor Data
1. Voltage Supply: TA7805F (Display Unit IC501): Providing supply voltage.
2. Voltage Detector: R3111H421C (Display Unit IC502)
2-1. Pin Function
Pin No. Name I/O Function
1 Vout O Reset.
2 GND GND.
3 Vin I Supply voltage.
3. Display CPU: UPD78F0511GB (Display Unit IC503)
3-1.Pin Function
Pin No. Name I/O Function
1 P41
2 P40 O SHIFT
3 RESET
4 P124/XT2
5 P123/XT1
6 FLMD0
7 P122/X2
8 P121/X1
9 REGC
10 VSS
11 VDD
12 P60 O LCDCS/LED1
13 P61 I/O LCDSOD/LED2
14 P62 O LCDDAT/LED3
15 P63 O LCDCLK/LED4
16 P33
I
RSW3/LEDA
17 P73 I PTT
18 P72 I DNKEY
19 P71 I UPKEY
20 P70 O KEYBL
21 P32
I
RSW2/LEDB
22 P31
I
RSW0(DN)
23 P30
I
RSW1(UP)
24 P17 O LCDBL/LED0
25 P16 I/O MICDAT
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26 P15 O OUT1/LED5
27 P14 I RXD1
28 P13 O TXD1
29 P12 O HMBL
30 P11 I HOOK/RXD0
31 P10 O TXD0
32 AVREF
33 AVSS
34 P27 I IN1
35 P26 I IN2
36 P25 I PF6
37 P24 I PF5
38 P23 I PF4
39 P22 I PF3
40 P21 I PF2
41 P20 I PF1
42 P01 O RLED
43 P00 O GLED
44 P120 O MicMute
4. Flash ROM: AT29C040-90T1 (TX-RX Unit IC103)
4-1 Pin Function
Pin No. Name I/O Function
1-6, 9-20, 31 A18-A0 I Flash ROM address bus.
7 WR I Flash ROM write enable.
8 VCC +5V.
21-23, 25-29 D0-D7 I/O Flash ROM data bus.
24 VSS GND.
30 CE I Flash ROM chip enable.
32 OE I Flash ROM output enable.
5. EEPROM: AT2408N12.5S (TX-RX Unit IC105)
5-1 Pin Function
Pin No. Name I/O Function
1-3 A0-A2 I Address inputs.
4 GND GND.
5 SDA I/O Serial Data.
6 SCL Serial clock input.
7 TEST Test.
8 VCC +5V.
6. Audio processor: AK2346 (TX-RX Unit IC106 and IC900)
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6-1 Pin Function
Pin No. Name I/O Function
1 AGNDIN I Analog ground input pin.
2 AGND O Analog ground output pin.
3 TXIN I Transmit audio signal input pin.
4 TXINO O TXA1 feedback output pin.
5 LIMLV I Limit level adjuster pin.
6 EXTLIMIN I External signal input pin pre-limiter pin.
7 MOD O The modulated transmit signal output pin.
8 VSS GND.
9 TCLK O Clock output pin for MSK transmission data.
10 TDATA I
MSK transmission data input pin.
Data are latched synchronizing with the TCLK rising edge.
11 DI/O I/O
Serial data input and output pin.
Input for register setting data and output for MSK receive data.
12 RDF/FC O MSK signal received flag and frame detection signal output pin.
13 SCLK I Clock input pin for serial data I/O.
14 DIR I Serial data I/O control pin.
15 XOUT I Crystal oscillator connecting input pin.
16 XIN I/O Crystal oscillator connecting input and output pin.
17 VDD Positive power supply pin.
18 EXPOUT O Expander and VR4 output pin.
19 RXAFIN I Receive audio signal input pin.
20 RXAF O Receive audio signal output pin.
21 RXLPFO O Receive LPF output pin.
22 RXINO O RXA1 feedback output pin.
23 RXIN I Demodulated audio signal input pin.
24 TEST I Test register control input pin.
7. D/A converter with buffer amplifier: M62364FP (TX-RX Unit IC125)
7-1 Pin Function
Pin No. Name I/O Description
1,4,9,12,13,16,21,24 V
IN1-VIN8
I D/A converter input.
2,3,10,11,14,15,22,23 V
OUT1-VOUT8
O D/A converter output with 8-bit resolution.
5 VDD +5V.
6 LD I A low state enables data loading to shift register.
7 CLK I Shift clock input.
8 DI I Serial data input.
17 DO O Serial data output.
18 V
DAref
I D/A Converter reference voltage input.
19 RESET I Reset 8-bit latches.
20 GND GND.
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8. Power amplifier: TDA1554Q (TX-RX Unit IC126)
8-1 Pin Function
Pin No. Name I/O Description
1 -INV1 I Non-inverting input 1.
2 INV2 I Inverting input 2.
3 GND(S) Signal ground.
4 RR Supply voltage ripple rejection.
5 VP1 Supply voltage.
6 OUT1 O Output 1.
7 GND1 Power ground 1.
8 OUT2 O Output 2.
9 NC No connection.
10 OUT3 O Output 3.
11 GND2 Power ground 2.
12 OUT4 O Output 4.
13 VP2 Supply voltage.
14 MODE I Mode select switch input.
15 NC No connection.
16 INV3 I Inverting input 3.
17 -INV4 I Non-inverting input 4.
9. Positive voltage regulator: XC62FP3302P (TX-RX Unit IC111), TA7805F (TX-RX Unit IC113),
TA78L09 (TX-RX Unit IC114), TA7808S (TX-RX Unit IC115).
10. Amplifier: NJM2904V (TX-RX Unit IC104, TX-RX Unit IC110, TX-RX Unit IC130), TA75W558FU
(TX-RX Unit IC107), TC75W51FU (TX-RX Unit IC108), NJM4558M (TX-RX Unit IC109),
TA75S01F (TX-RX Unit IC116, TX-RX Unit IC117), TA75W01FU (TX-RX Unit IC118).
11. IF detector: TA31136FN (TX-RX Unit IC119).
12. Dual D-type Flip-flop: TC4013BF (TX-RX Unit IC127).
13. RF PLL Frequency Synthesizers: ADF4111 (TX-RX Unit IC801).
14. Reset IC: IMP813LESA
15. CPU: M16C (Tx-Rx Unit IC120)
15-1 Pin Function
PIN No. PORT PIN NAME I/O DESCRIPTION
1 P94/DA1 2TN/5TN
I 2-tone/5-tone decode pulse input
2 P93/DA0 DTMF O DTMF/2Tone/5Tone/BEEP output
3 P92 SBC O SB power switch control. H: off L: on
4 P91 AFDIO I/O AK2346 DATA I/O (SDAT)
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5 P90 AFSCLK O AK2346 serial clock (SCLK)
6 BYTE BYTE I +5V(5C)
7 CNVSS CNVSS I GND
8 P87 PA
O MIC PA switch control PA: H
9 P86 DACSTB O DA conversion strobe output
10 RESET RESET I Reset
11 XOUT XOUT O Clock output
12 VSS VSS I GND
13 XIN XIN I Clock input
14 VCC VCC I +5V
15 P85/NMI NMI I NMI, usually not use
16 P84/INT2 AFRDF I Bandpass MSK receive detect (RDF/FD)
17 P83/INT1 DTMFSTD I DTMF decode detect Detect: H
18 P82/INT0 AUX2 I/O PCB AUX 2 (input)
19 P81/TA4in AUX3 I/O AUX3 port (input)
20 P80/TA4out AUX4 I/O AUX4 port (input) (output)
21 P77/TA3in SPMUTE O SP Mute Mute: H
22 P76/TA3out TO O CTCSS/CDCSS modulation output
23 P75/TA2in EMICC O External MIC control External MIC: H
24 P74/TA2out AFTDATA O Bandpass chip MSK serial data(TDATA)
25 P73/TA1in AFTCLK I Bandpass chip MSK serial clock(TCLK)
26 P72/TA1out AFDIR O Bandpass chip I/O control (DIR)
27 P71/RXD2 RXD2 I Serial data input
28 P70/TXD2 TXD2 I Serial data output
29 P67/TXD1 TXD1 O Acc comm2 (serial data output)
30 P66/RXD1 RXD1 I Acc comm2 (serial data input)
31 P65 AUX5 I/O AUX5 port (output)
32 P64 AUX6 I/O AUX6 port (output)
33 P63 TXD0 O Acc comm1(serial data output)
34 P62 RXD0 I Acc comm1(serial data input)
35 P61 AUX7 I/O AUX7 port (output)
36 P60 AUX1 I/O AUX1 port (input)
37 P57 RDY I Pull Up
38 P56 NC O NC (left floating)
39 P55 HOLD O NC (left floating)
40 P54 NC O NC (left floating)
41 P53 NC O NC (left floating)
42 P52 RD O Read (for expansion)
43 P51 NC O NC (left floating)
44 P50 WR O Write (for expansion)
45 P47 HNC O Horn alert control On: H
46 P46 SHIFT O Clock frequency shift On: H
47 P45 W/N O W/N switch W: L
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48 P44 CS0 O Signal select (expansion chip)
49 A19 A19 O NC
50-59 A18-A9 A18-A9 O FLASH ROM address bus
60 VCC VCC I +5V
61 A8 A8 O FLASH ROM address bus
62 VSS VSS I GND
63-70 A7-A0 A7-A0 O FLASH ROM address bus
71 P17 8RC O 8R power supply control RX: H
72 P16 8TC O 8T power supply control TX: H
73 P15 RX O TX/RX VCO switch RX: L
74 P14 EEPDAT I/O EEPROM data input/output
75 P13 EEPCLK O EEPROM clock output
DACLK O DA clock output
76 P12 PLLUL I PLL unlock detect Unlock: L
77 P11 PLLSTB O PLL strobe output Lock: L
78 P10 AFMUTE O AF Mute (RX) Mute: H
79-86 D7~ D0 D7-D0 FLASH ROM address bus
87 P10 PWR I [PWR] key input On: L
88 P10 IGN I Ignition sense input H: off L: on
PLLDAT O PLL data output
89 P10
DADAT O DA data output
90 P10 PLLCLK O PLL clock output
91 AN3 TEMP I Temperature input
92 AN2 RSSQL I RSSI input
93 AN1 ANLSQL I SQL input (analogue)
94 AVss AVss I GND
95 AN0 TI I CTCSS/CDCSS signal input
96 VREF VREF I Reference voltage input
97 AVCC AVCC I GND
98 P97/Sin4 AUX8 O
WDI，Reset IC Input
99 P96/Sout4 DTMFCLK O DTMF chip decode clock output
100 P95/Clk4 DTMFDAT I DTMF chip decode clock input
Component Description
1. TX-RX Unit
Ref. No. Part Name Type Description
IC102 IC Power module Power module
IC103 IC AT29C02-90T1 Flash ROM
IC104 IC NJM2904V Single-supply dual operational amplifier
IC105 IC AT2408N12.5S EEPROM
IC106 IC AK2346 Audio processor
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IC107 IC TA75W558FU Dual operational amplifier
IC108 IC TC75W51FU Dual operational amplifier
IC109 IC NJM4558M Dual operational amplifier
IC110 IC NJM2904V Single-supply dual operational amplifier
IC111 IC XC62FP3302P Positive voltage regulator
IC113 IC TA7805F Positive voltage regulator
IC114 IC TA78L09 Positive voltage regulator
IC115 IC TA7805S Positive voltage regulator
IC116 IC TA75S01F Single operational amplifier
IC117 IC TA75S01F Single operational amplifier
IC118 IC TA75W01FU Dual operational amplifier
IC119 IC TA31136FN IF detector
IC120 IC M16C CPU
IC121 IC BU4066BCFV Quad analog switch
IC122 IC BU8872FS
DTMF Decoder（deleted for 5Tone Model）
IC125 IC M62364FP D/A converter with buffer amplifiers
IC126 IC TDA8561Q Power amplifier
IC127 IC TC4013BF Dual D-type Flip-flop
IC129 IC IMP813LESA Reset IC
IC130 IC NJM2904V Single-supply dual operational amplifier
2. DISPLAY UNIT
Ref. No. Part Name Type Description
IC501 IC TA7805F Voltage supply.
IC 502 IC R3111H421C Voltage detector.
IC 503 IC UPD78F0511GB Display CPU.
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TM-800K Parts List 1
TM-800K UHF Parts List 1
No.
Material No. Description Qty.
Ref.
No.
Print
No.
1 3001050000000 Chip resistor 0402 0Ω J 1/16W(R 2 R252 B9M
R260 B8M
2 3001060000000 Chip resistor 0603 0Ω J 1/10W(R 68 R116 B5E
R172 B5E
R182 B9H
R184 B8H
R193 T6E
R210 T6F
R211 B4K
R218 T6E
R254 B7C
R270 B7K
R281 B9K
R290 T6E
R312 B8E
R317 B7J
R318 B7J
R324 B6J
R334 B7G
R335 B7J
R340 B5J
R364 B3L
R383 B3L
R385 B3K
R386 B3K
R389 B10H
R390 T5D
R401 T3C
R402 T3C
R403 B2L
R404 B2L
R405 T6D
R406 T10B
R407 T8C
R408 T7B
R423 T7D
R424 T7D
R434 T7D
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