HYT TM-800 User manual

CONTENTS
General…………………………………………………………………………………………..1
Radio Overview………………………………………………………………………….………2
Software Specification…………………………………………………………………………5
Circuit Description………………………………………………..…………………………..77
Semiconductor Data………………………………………………………………………….82
Component Description…………………………………………..…………………………89
Part List 1…………………………………………………………………………….…………90
Exploded View…………………………………………………………………..……………106
Part List 2…………………………………………………………………………..………….107
Disassembly and Reassembly for Repair………………………………………………..108
Remote Kit Installation (Optional)…………………………………………………….…..111
Packing……………………………………………………………...…………………………113
Adjustment……………………………………………………………………...…………….114
Adjustment Description……………………………………………………………….……121
Terminal Function……………………………………………………………………………127
Display Unit…………………………………………………………………………………...131
Tx-Rx Unit……………………………………………………………………………………..135
VCO…………………………………………………………………………………………….139
Schematic Diagram………………………………………………………………………….141
Block Diagram…………………………………………………………………………….…146
Specifications…………………………………………………………….…………………147

TM-800 SERVICE MANUAL
1
General
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.
Precautions
Safety Standards
●DO NOT operate your radio when someone is either touching or standing within 2 or 3 feet of
the antenna, to avoid the possibility of radio frequency burns or related physical injury.
●DO NOT operate the radio near electrical blasting caps or in an explosive atmosphere.
●Switch OFF the radio while refueling or parking at gas station.
●Turn off your radio in any place where posted notices instruct you to do so.
●DO NOT modify the radio for any reason.
●DO NOT expose the radio to direct sunlight over a long time, nor place it close to heating
source.
●DO NOT place the radio in excessively dusty, humid areas, nor on unstable surfaces.
●Refer the service to qualified technicians only.
Operation Safety Guidelines
●For vehicles equipped with electronic anti-skid braking systems, electronic ignition systems
or electronic fuel injection systems, interferences may occur during the radio transmission. If
the foregoing electronic equipments are installed on your vehicle, please contact your dealer
for further assistance to make sure that the 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 Safety Guidelines
●Do not mount the mobile radio overhead or on a sidewall unless you take special
precautions.
●If someone were to remove the radio and fail to replace it properly, 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 a crash, even when properly installed, the radio could break
loose and become a dangerous projectile.

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Radio Overview
Front Panel View
①Power
Press the power button to switch the radio on/off.
②Selector Knob
Volume Up/Down, Channel Up/Down, Zone Up/Down features can be programmed to this knob
(Set by your dealer).
Turn the knob clockwise to adjust upwards and counter-clockwise to adjust downwards.
③LCD Display
Please refer to “LCD Display” section.
④Up/Down Key
Volume Up/Down, Channel Up/Down, Zone Up/Down features can be programmed to the keys
(Set by your dealer).
⑤Microphone Jack
Insert a 6-pin connector into the jack.
⑥Programmable Function Key (PF1-PF6)
Your dealer can program these keys as shortcuts to various radio features.

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Microphone
LCD Display
Indicator Description
1. Display zone / channel number.
2. Display zone / channel label (set by your dealer, 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 selected channel is busy.
Appears when [MONI] key is pressed to disable CTCSS, CDCSS, DTMF or
2-Tone/5-Tone.
Appears when [MONI] key is pressed to switch the speaker on.
A 1. Indicate second development feature.
2. Appears when the auxiliary port is open.
SCAN Appears while scanning.
CALL Appears when transmitting selective call.
Appears when a new message is received.
Appears when the selected zone is in the scan list.
Appears when the selected channel is in the scan list.

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Rear Panel View
①Antenna Connector
Used to connect external antenna.
②Power input Connector
Adopt HYT-authorized DC power cable and 13.6 V input AC power.
③Speaker Jack
Used to connect external speaker and only available for the plug of 3.5 mm.
④GPS Antenna Jack
⑤15 Pin Connector (for accessories)

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Software Specification
Radio Modes
1. Frame of Radio Modes
Firmware Download
PC Mode
Clone Mode Wired Clone Mode
Wireless Clone Mode
Dealer Mode Channel Set Mode
Zone Information Mode
Function Set Mode
Scan Information Mode
DTMF Set Mode
2-Tone Set Mode
5-Tone Set Mode
Embedded Message
Emergency Set Mode
Stun Set Mode
Mode Information Mode
User Set Mode
User Mode Conventional Mode
Model Set Mode
Model & Adjust Mode

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2. Keypad Entry for Mode Startup
MODE Main Menu Display/Sub
Menu Operation Remarks
Conventional
Mode ------------------------- Turn on the power to enter Conventional Mode
Function Set
PowerOn Text Refer to Appendix 1 “Character
Input”
PWR Password Power on password set
Ust Code
USER
MODE User Set Mode
Key Assign
While holding down [PF1]
key, turn on the power
Programmable Function Key
Channel Set Mode Channel Set New zone & ch, edit ch
Zone Information
Mode Zone Inform Only existing Zone can be edited
Function 1
Function 2
Tone Volume
Alert Tone
Aux Inform
Function Set
Data Password
Scan Set
Scan Information Zone Scan List
DTMF Encode
DTMF Decode
Auto Dial List
DTMF Set Mode
PTT ID
2Tone Encode
2Tone Decode
2 Tone Set Mode
2Tone Option
Parameter
Encode Teleg
Encode Frame
Encode Option
Decode Teleg
5 Tone Set Mode
Decode Option
Embedded Msg1 32 bytes
Embedded Msg2 32 bytes
Embedded Msg3 32 bytes
Embedded Msg4 32 bytes
Embedded
Message
Msg Password Protect Msg
Emergency set Emergency Set
Stun Inform
Stun Set Stun Password Password Authentication
Mode Select Password Authentication
DEALER
MODE
Mode Information Mode Password
Turn on the power while
holding down [PF6] key to
enter Dealer Mode, select
one of Menu items.

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Note:
When power-on password is enabled, you can enter User Mode only after inputting correct password.
And if data password is enabled, you can enter Dealer Mode only after inputting correct data
password.
You can input password through the keypad and press [#] to clear.
3. User Set Mode
(1) Turn the power on while holding down [PF1], the radio enters User Set Mode after inputting
correct power-on password (if Power-On Password is set). The submenus are shown as
follows:
Sub Menu Menu Item
1 Function Set
2 PowerOnText
3 PWR Password
4 UST Code
5 Key Assign
(2) Press [PF6] to enter the selected submenu.
(3) Adjust settings through the Selector Knob.
(4) Press [PF6] to save the change and enter the next item.
(5) Press [Up]/ [Down] to select your desired menu item.
(6) Press [PF1] to return to User Set Mode.
Test Mode ----------------------------
ADJUST MODE ----------------------------
TEST &
ADJUST
MODE Model Set Mode ----------------------------
While holding down [PF2]
key, turn on the power
Firmware Version Display Mode ---------------------------- While holding down [PF3]
key, turn on the power
Firmware Down Load Mode ---------------------------- While holding down [PF4]
key, turn on the power
Wire Clone Mode ---------------------------- While holding down [PF5]
key, turn on the power
PC Mode ---------------------------- Receive commands from PC

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Function Set
Select submenu “Function Set”, then press [PF6] to enter Function Set Mode.
No. Function Name Settings Display Remarks
Home Off Home Off
Home 1 On Home 1 On
Home 2 On Home 2 On
Home Both On Home Both On
1 Home Channel
Zone Home
Channel Home Zone
Zone 1 Selector Knob: change a zone/ch
2 Home Channel 1 Channel Home1 1 [PF5]: toggle between zone and ch
Zone 1 Selector Knob: change a zone/ch
3 Home Channel
2 Channel Home2 1 [PF5]: toggle between zone and ch
Power On Text
Select submenu “Power OnText”,press [PF6], the power-on text is displayed. Press [PF1] to edit the
power-on text.
Power On Password
Select submenu “PWR Password”, press [PF6], the power-on password is displayed. Press [PF1] to
edit the power-on password.
No. Function Name Settings Display Remarks
None ------------
Refer to Appendix 1 “Character Input”
Max. 8 digits
1Power On Password
Power on password 88888888
No. Function Name Settings Display Remarks
Power On Text None -------------------
1
Power on text HYT MOBILE
Refer to Appendix 1 “Character
Input”
Max.12 characters

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UST Code
Select submenu “UST Code”, press [PF6] to enter UST Code Mode.
No. Function Name Settings Display Remarks
1-32 UST 1
1UST Code No.
UST 32
ASCII CODE Name
2UST Code Name
-------- No input
OFF
R
Off
R
CTCSS 67.0
CTCSS
(EIA standard)
67.0-254.1Hz
R
CTCSS 254.1
R
CTCSS 67.0*
CTCSS
(0.1Hz step)
67.0-254.1Hz
R
CTCSS 254.1*
R
CDCSS 023N
CDCSS (standard)
023-754 R
CDCSS 754N
R
CDCSS 000N*
CDCSS (1 step)
000-777 R
CDCSS 777N*
R
CDCSS 023I
CDCSS (standard)
023-754 reverse R
CDCSS 754I
R
CDCSS 000I*
3 RX Signalling
CDCSS (1step)
000-777 reverse R
CDCSS 777I*
[PF5]: OFF/CTCSS/CDCSS
[PF4]: standard/step mode
[PF3]: CDCSS/ reverse CDCSS

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OFF T
Off
T
CTCSS 67.0
CTCSS
(EIA standard)
67.0-254.1Hz R
CTCSS 254.1
T
CTCSS 67.0*
CTCSS
(0.1Hz step)
67.0-254.1Hz T
CTCSS 254.1*
T
CDCSS 023N
CDCSS (standard)
023-754 T
CDCSS 754N
T
CDCSS 000N*
CDCSS (1step)
000-777 T
CDCSS 777N*
T
CDCSS 023I
CDCSS (standard)
023-754 reverse T
CDCSS 754I
T
CDCSS 000I*
4 TX Signalling
CDCSS (1step)
000-777 reverse T
CDCSS 777I*
[PF5]: Off/CTCSS/CDCSS
[PF4]: standard/step mode
[PF3]: CDCSS/ reverse CDCSS
5 END END END Display “END” indicating the
end of menu options

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Key Assignment
Select submenu “Key Assign”, press [PF6] to program the programmable function key PF1-PF6.
No. Key Settings Display Remarks
Off
1
PF1 Off None
VOL Up
2
PF1 VOL Up Volume up
VOL Down
3
PF1 VOL Down Volume down
CH Up
4
PF1 CH Up Channel up
CH Down
5
PF1 CH Down Channel down
Zone Up
6
PF1 Zone Up Zone up
Zone Down
7
PF1 Zone Down Zone down
MONI A
8
PF1 MoniA
MONI A:
Monitor Unmute-Momentary
MONI B
9
PF1 MoniB
MONI B:
Monitor Unmute-Toggle
MONI C [Default]
10
PF1 MoniC
MONI C:
Carrier Squelch-Momentary
MONI D
11
PF1 MoniD
MONI D:
Carrier Squelch-Toggle
Display Label
12
PF1 DLabel Display channel label
Display Frequency
13
PF1 DFreq Display frequency
Display Mode
14
PF1 DMode
Ch No./ch label/zone No./zone
label/RX Freq.
User Selectable Tone
15
PF1 UserTone Tone 01-32(CTCSS/CDCSS)
Sel 2Tone
16
PF1 Sel2Tone Select 2-Tone encode
Sel 5Tone
17
PF1 Sel5Tone Select 5-Tone encode
1[PF1]
Tx Power
18
PF1 TxPower Switch TX power

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Scan
19
PF1 Scan Scan
Add/Del in non-scan mode
Nuisance channel temp.Del
Add/Del 20
PF1 Add/Del
Priority ch temp. del
Reverse
21
PF1 Reverse Reverse frequency
Talk Around
22
PF1 TA Talkaround
SEL SQL
23
PF1 SelSQL Select SQL
Home CH
24
PF1 HomeCH Home channel
Public Address
25
PF1 PA Public address
Horn Alert
26
PF1 Horn Alert Horn alert
LCD BackLight
27
PF1 LCD Light LCD backlight
Scrambler
28
PF1 Scramble Scrambler
Compander
29
PF1 Compande Compander
AUX A
30
PF1 AUX A AUXA port output control
AUX B
31
PF1 AUX B AUXB port output control
Send GPS
32
PF1 Send GPS Send GPS
Emergency Call
33
PF1 Emergency Emergency call
1[PF1]
Message
34
PF1 Message Message

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Off
1
PF2 Off None
VOL Up
2
PF2 VOL Up Volume up
VOL Down
3
PF2 VOL Down Volume down
CH Up
4
PF2 CH Up Channel up
CH Down
5
PF2 CH Down Channel down
Zone Up
6
PF2 Zone Up Zone up
Zone Down
7
PF2 Zone Down Zone down
Moni A
8
PF2 MoniA MONI A
Moni B
9
PF2 MoniB MONI B
Moni C
10
PF2 MoniC MONI C
Moni D
11
PF2 MoniD MONI D
DisplayLabel
12
PF2 DLabel Display channel label
Display Frequency
13
PF2 DFreq Display frequency
DisplayMode [Default]
14
PF2 DMode
Ch No./ch label/zone No./zone
label/RX Freq.
User Selectable Tone
15
PF2 UserTone Tone 01-32(CTCSS/CDCSS)
Sel 2Tone
16
PF2 Sel2Tone Select 2-Tone encode
Sel 5Tone
17
PF2 Sel5Tone Select 5-Tone encode
Tx Power
18
PF2 TxPower Switch TX power
Scan
19
PF2 Scan Scan
Add/Del as not in scan status
Nuisance channel temp.Del
2[PF2]
Add/Del 20
PF2 Add/Del Priority ch temp. del

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Reverse
21
PF2 Reverse Reverse frequency
Talk Around
22
PF2 TA Talkaround
Sel SQL
23
PF2 SelSQL Select SQL
Home CH
24
PF2 HomeCH Home channel
Public Address
25
PF2 PA Public address
Horn Alert
26
PF2 Horn Alert Horn alert
LCD BackLight
27
PF2 LCD Light LCD backlight
Scramble
28
PF2 Scramble Scrambler
Compander
29
PF2 Compande Compander
AUX A
30
PF2 AUX A AUXA port output control
AUX B
31
PF2 AUX B AUXB port output control
Send GPS
32
PF2 Send GPS Send GPS
Emergency Call
33
PF2 Emergency Emergency call
2[PF2]
Message
34
PF2 Message Message
Off
1
PF3 Off None
VOL Up
2
PF3 VOL Up Volume up
VOL Down
3
PF3 VOL Down Volume down
CH Up
4
PF3 CH Up Channel up
CH Down
5
PF3 CH Down Channel down
Zone Up
6
PF3 Zone Up Zone up
3[PF3]
Zone Down
7
PF3 Zone Down Zone down

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Moni A
8
PF3 MoniA
MONI A:
Monitor Unmute-Momentary
Moni B
9
PF3 MoniB
MONI B:
Monitor Unmute-Toggle
Moni C
10
PF3 MoniC
MONI C:
Carrier Squelch-Momentary
Moni D
11
PF3 MoniD
MONI D:
Carrier Squelch-Toggle
Display Label
12
PF3 DLabel Display channel label
Display Frequency
13
PF3 DFreq Display frequency
Display Mode
14
PF3 DMode
Ch No./ch label/zone No./zone
label/RX Freq.
User Selectable Tone
15
PF3 UserTone Tone 01-32(CTCSS/CDCSS)
Sel 2Tone
16
PF3 Sel2Tone Select 2-Tone encode
Sel 5Tone
17
PF3 Sel5Tone Select 5-Tone encode
Tx Power [Default]
18
PF3 TxPower Switch TX power
Scan
19
PF3 Scan Scan
Add/Del as not in scan status
Nuisance channel temp.Del
Add/Del 20
PF3 Add/Del Priority ch temp. del
Reverse
21
PF3 Reverse Reverse frequency
Talk Around
22
PF3 TA Talkaround
Sel SQL
23
PF3 SelSQL Select SQL
Home CH
24
PF3 HomeCH Home channel
Public Address
25
PF3 PA Public address
Horn Alert
26
PF3 Horn Alert Horn alert
3[PF3]
LCD BackLight
27
PF3 LCD Light LCD backlight

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Scramble
28
PF3 Scramble Scrambler
Compander
29
PF3 Compande Compander
AUX A
30
PF3 AUX A AUXA port output control
AUX B
31
PF3 AUX B AUXB port output control
Send GPS
32
PF3 Send GPS Send GPS
Emergency Call
33
PF3 Emergency Emergency call
3[PF3]
Message
34
PF3 Message Message
Off
1
PF4 Off None
VOL Up
2
PF4 VOL Up Volume up
VOL Down
3
PF4 VOL Down Volume down
CH Up
4
PF4 CH Up Channel up
CH Down
5
PF4 CH Down Channel down
Zone Up
6
PF4 Zone Up Zone up
Zone Down
7
PF4 Zone Down Zone down
Moni A
8
PF4 MoniA
MONI A:
Monitor Unmute-Momentary
Moni B
9
PF4 MoniB
MONI B:
Monitor Unmute-Toggle
Moni C
10
PF4 MoniC
MONI C:
Carrier Squelch-Momentary
Moni D
11
PF4 MoniD
MONI D:
Carrier Squelch-Toggle
DispayLabel
12
PF4 DLabel Display channel label
4[PF4]
Display Frequency
13
PF4 DFreq Display frequency

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Display Mode 14
PF4 DMode
Ch No./ch label/zone No./zone
label/RX Freq.
User Selectable Tone 15
PF4 UserTone Tone 01-32(CTCSS/CDCSS)
Sel 2Tone 16
PF4 Sel2Tone Select 2-Tone encode
Sel 5Tone 17
PF4 Sel5Tone Select 5-Tone encode
Tx Power 18
PF4 TxPower Switch TX power
Scan [Default] 19
PF4 Scan Scan
Add/Del as not in scan status
Nuisance channel temp.Del
Add/Del 20
PF4 Add/Del Priority ch temp. del
Reverse 21
PF4 Reverse Reverse frequency
Talk Around 22
PF4 TA Talkaround
Sel SQL 23
PF4 SelSQL Select SQL
Home CH 24
PF4 HomeCH Home channel
Public Address 25
PF4 PA Public address
Horn Alert 26
PF4 Horn Alert Horn alert
LCD BackLight 27
PF4 LCD Light LCD backlight
Scramble 28
PF4 Scramble Scrambler
Compander 29
PF4 Compande Compander
AUX A 30
PF4 AUX A AUXA port output control
AUX B 31
PF4 AUX B AUXB port output control
Send GPS 32
PF4 Send GPS Send GPS
Emergency Call 33
PF4 Emergency Emergency call
4[PF4]
Message 34
PF4 Message Message

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Off
1
PF5 Off None
VOL Up
2
PF5 VOL Up Volume up
VOL Down
3
PF5 VOL Down Volume down
CH Up
4
PF5 CH Up Channel up
CH Down
5
PF5 CH Down Channel down
Zone Up
6
PF5 Zone Up Zone up
Zone Down [Default]
7
PF5 Zone Down Zone down
Moni A
8
PF5 MoniA
MONI A:
Monitor Unmute-Momentary
Moni B
9
PF5 MoniB
MONI B:
Monitor Unmute-Toggle
Moni C
10
PF5 MoniC
MONI C:
Carrier Squelch-Momentary
Moni D
11
PF5 MoniD
MONI D:
Carrier Squelch-Toggle
Display Label
12
PF5 DLabel Display channel label
Display Frequency
13
PF5 DFreq Display frequency
Display Mode
14
PF5 DMode
Ch No./ch label/zone No./zone
label/RX Freq.
User Selectable Tone
15
PF5 UserTone Tone 01-32(CTCSS/CDCSS)
Sel 2Tone
16
PF5 Sel2Tone Select 2-Tone encode
Sel 5Tone
17
PF5 Sel5Tone Select 5-Tone encode
Tx Power
18
PF5 TxPower Switch TX power
Scan
19
PF5 Scan Scan
Add/Del as not in scan status
Nuisance channel temp.Del
5[PF5]
Add/Del 20
PF5 Add/Del Priority ch temp. del

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Reverse
21
PF5 Reverse Reverse frequency
Talk Around
22
PF5 TA Talkaround
Sel SQL
23
PF5 SelSQL Select SQL
Home CH
24
PF5 HomeCH Home channel
Public Address
25
PF5 PA Public address
Horn Alert
26
PF5 Horn Alert Horn alert
LCD BackLight
27
PF5 LCD Light LCD backlight
Scramble
28
PF5 Scramble Scrambler
Compander
29
PF5 Compande Compander
AUX A
30
PF5 AUX A AUXA port output control
AUX B
31
PF5 AUX B AUXB port output control
Send GPS
32
PF5 Send GPS Send GPS
Emergency Call
33
PF5 Emergency Emergency call
5[PF5]
Message
34
PF5 Message Message
Off
1
PF6 Off None
VOL Up
2
PF6 VOL Up Volume up
VOL Down
3
PF6 VOL Down Volume down
CH Up
4
PF6 CH Up Channel up
CH Down
5
PF6 CH Down Channel down
Zone Up [Default]
6
PF6 Zone Up Zone up
6[PF6]
Zone Down
7
PF6 Zone Down Zone down