- RADIO JUMPER SETTINGS
		- Types of Jumpers
		- Personality Boards Jumper Settings and Locators
			- HLN4915A / HLN4760A Jumper Locater
			- HLN4760B Jumper Locater
			- HLN4760C Jumper Locater
			- HLN4257A Jumper Locater
			- TRN8861A Jumper Locater
		- Common Circuits Boards Jumper Settings and Locators
			- HLN4817 Low Band Jumper Locater
			- HLN4838 / HLN5106 VHF Jumper Locater
			- HLN4797 / HLN5148 UHF Jumper Locater
			- TRN8862 800 MHz Jumper Locater
			- HLN4817 Low Band Control Locater
			- HLN4838 / HLN5106 VHF Control Locater
			- HLN4240 VHF Control Locater
			- HLN4797 / HLN5148 UHF Control Locater
			- TRN8862 Control Locator
		- Hand Held Control Head Control Board Jumper Settings and Locators
			- HLN4728 Jumper Locator
		- HLN4270A and HLN4270B DVP Interface Board jumper settings
		- HLN4425A DVP Interface Board jumper settings
		- HLN5008A DVP Interface Board jumper settings
	- Syntor X Home
	- HOME

Types of jumpers:

I have encountered four different types of jumpers in Syntor X radios. One is a brown body zero ohm resistor with a single black stripe, another is a white body zero ohm resistor with "0 Ohm" written on the side, another is the plastic body removable jumper commonly found in computers (it needs pins sticking up from the circuit board header to work) and the last is a wire with a short piece of white insulation. The two types of zero ohm resistors should be unsoldered if you remove them as you may need them intact for another jumper position.

Personality boards jumper settings and locators:

I have found documentation in some older Motorola manuals that indicates JU8 "Data" used to be out. I have in fact found it missing in some T83VBJ radios even though they had no audio connection to the Data modulation audio path input.

HLN4915A, HLN4760 A, B and C Revision Personality Board Jumpers
	4915A 4760A	4760B	4760C	Description	STD	HHCH
JU1	x	x	x	Scan Enable	in	out
JU2	x	x	x	PL/DPL Reverse Burst	in *#	in *#
JU3	x	x	x	Customer Special Application (PTT)	in	in
JU4	x	x	x	Customer Special Application	in	in
JU5	x	x	x	Out for > 64 Modes	in	in
JU6	x	x	x	In for > 64 Modes	out	out
J6	x	x	x	Power Connections	$	$
JU7				NOT USED
JU8	x	x	x	Data Enable	in *#	in *#
JU9	x	x	x	Squelch Tail	in	in
JU10	x	x	x	PL/DPL Disable	in	in
JU11	x	x	x	Det. Mute Control	out	out
JU12	x	x	x	DVP Modulation / Detector Mute	out *#	out *#
JU13	x	x	x	DVP Modulation	in	in
JU14	x	x	x	Display Enable	out	in
JU15	x	x	x	Control Head Strobe	out	in
JU16	x	x	x	Input Strobe Enable	out	in
JU17	x	x	x	Output Strobe Disable	in	out
JU18	x	x	x	HY3 pin 2 pullup	in	out
JU19	x	x	x	HY4 pin 4 pullup	in	out
JU20		x	x	Low Band Radio Bypass	out	out
JU21			x	DVP XL Rx Securenet	out #	out #
JU22			x	Rx DVP Select (A / B)	A	B
JU23			x	M7 Disable	out	out
J21			x	PTT Ref. Select (A / B)	A #	A #
J22			x	Disc Audio	in #	in #
J23			x	Squelch Audio Select (A / B)	A #	A #
JU451	x	x	x	Audio PA Mute Disable	out *#	out *#
R33			x	DVP XL (390 Ohm Resistor)	out #	out #

• * - Reverse for DVP (non-XL).
• # - Reverse for DVP XL (HLN4760C only).
• $ - Special power jumpers (5 pins total); Normally 1-2 are connected to each other and 3-4 are connected to each other.
• HHCH is an abbreviation for Hand Held Control Head. The HLN4915A and HLN4760 (all revisions) are the only Personality Boards that support the HLN4728 Hand Held Control Head (HHCH) interface board.
• The "Scan Enable" and "Display Enable" STD jumper positions really depend on which control heads and accessories (i.e. System 90*s vs. Clamshell) are used.
• The "Low Band Radio Bypass" jumper is installed "in" for T51 and T71 low band radios. The HLN4760A does not have this jumper, so the HLN4915A is used instead. The HLN4915A is permanently setup as a low band only Personality Board and later it was replaced by the more versatile HLN4760B and HLN4760C.
• In radios used for packet data, JU2 should be removed to obtain the fastest possible switching between transmit and receive.
• Some of the Motorola description names are misleading. i.e. JU10 PL/DPL Disable actually connects J1 pin 32 PL/DPL Disable line to the radio's microprocessor. It does not actually disable the PL/DPL, instead, it provides a path for the external PL/DPL Disable line.
• JU4 (behind the I/O Board), JU9 and JU13 (partially under the Receiver Board) can be difficult to see.
• JU12 is also used by the Mobile Voice Storage option to disconnect the DVP Modulation and run a wire to the Detector Mute input on a HLN4270B or HLN5008A DVP Interface Board. The HLN4225A and HLN4270A do not have a Detector Mute connection.
• These Personality Boards can be modified for packet operation with or without the HLN5008A DVP Interface Board.
• For negative ground radios (which is the only type covered on this web site), unless you have a specific reason not to, just follow the chart above.
• Click here for a HLN4915A / HLN4760A jumper locater.
• Click here for a HLN4760B jumper locater.
• Click here for a HLN4760C jumper locater.

Miscellaneous jumpering notes:

• JU21, J21, J22 and J23 appear to be for DVP XL.
• JU22 appears to be for HHCH DVP XL.
• Installing JU451 disables the mute circuitry for the audio amplifier. This allows the DVP control head to send tones (using J1-34 Sidetone In) to the speaker while the radio is transmitting. The tones are for "keyfail" and the alert beep to warn the operator they are not transmitting in DVP mode. It also allows the HHCH to send tones to the speaker.

SPECIAL DVP JUMPERING NOTE: "VXJ" model DVP radios that have the HLN5008A DVP Interface Board, but do not have a DVP control head or DVP bypass board, have a special jumpering consideration. The radio must be jumpered as a non-DVP radio. Make sure JU8 "Data Enable" is installed (as indicated for non-DVP radios) because this causes the HLN5008A DVP Interface Board to enable the PL/DPL modulation path. "VBJ" radios should be checked for the presence of the HLN5008A DVP Interface Board to see if they are really "VXJ" models.

HLN4257 & TRN8861 Personality Board Jumpers
	HLN4257	TRN8861	Description	STD
JU1	x	x	Scan Enable	in
JU2	x	x	PL/DPL Reverse Burst	in*
JU3	x	x	Customer Special Application (PTT)	in
JU4	x	x	Customer Special Application	in
JU5	x		Out for > 64 Modes	in
JU6	x		In for > 64 Modes	out
JU7	x		NOT USED	out
JU8	x		Data Enable	in*

• * - Reverse for DVP using the HLN4425A DVP Interface Board.
• The HLN4257B Personality Board is the same as the HLN4257A, except that header pins have been added to plug in a HKN4117A cable. The HKN4257B was originally marked HLN4257A-SP700.
• The "Scan Enable" jumper position really depends on which control heads and accessories (i.e. System 90*s vs. Clamshell) are used.
• Sometimes the J1-33 "Display Enable input cable wire" is needed to be re-routed to another J1 signal pin. When this is done a custom jumper is created with some wire and soldering on the Personality Board to ground the Display Enable (if needed).
• Sometimes these Personality Boards will have custom jumpers installed on the bottom (trace side) of the printed circuit board. Open the top of the radio with the push button under the handle and check the traces above the J1 radio cable connector. If you find any jumper wires here check them out thoroughly. I usually remove any custom jumper wires unless I have a good reason to keep them (see the J1-33 jumper modification above).
• These Personality Boards do not support the Hand Held Control Head. They can be modified for packet operation with or without the HLN4270A, HLN4270B or HLN4425A DVP Interface Boards.
• JU4 is behind the I/O Board and can be difficult to see.
• In some old documentation JU8 was shown as out instead of in (as above).
• Unless you have a specific reason not to, just follow the chart above.
• Click here for a HLN4257A jumper locater.
• Click here for a TRN8861A jumper locater.

SPECIAL DVP JUMPERING NOTE: "VXJ" model DVP radios that have a HLN4270A, HLN4270B or HLN4425A DVP Interface Board, but do not have a DVP control head or DVP bypass board, have a special jumpering consideration. The radio must be jumpered as a non-DVP radio. Make sure JU8 "Data Enable" is installed (as indicated for non-DVP radios) because this causes the DVP Interface Board to enable the PL/DPL modulation path. "VBJ" radios should be checked for the presence of a DVP Interface Board to see if they are really "VXJ" models.

Common Circuits boards jumper settings and locators:

Common Circuits Boards Jumpers
Low Band HLN4817A	VHF HLN4838B HLN5106A	VHF HLN4240A YLN4197A	UHF HLN4797A HLN5148A	800 MHz TRN8862A	STD	HHCH
J401			JU401		out *	out *
JU402	JU402		JU402		in *	in *
	J403				out *	out *
J501	J501		JU501		out	in
	JU502		JU502		in *	in *
			JU901		in	in
			JU902		in	in
				JU951	in
				JU952	in
JU1001					in	in

• * - Reverse for DVP or DVP XL.
• If you use a VXJ model radio without the DVP control head and cable, simply jumper as if it was not a DVP radio.
• HHCH is an abbreviation for the HLN4728 Hand Held Control Head (HHCH) interface board.
• The jumpers in the 400 range are in the squelch circuit, the 500 range in the modulation/deviation control circuit and the 900 range are in the SWR/Temperature protection circuit.
• HLN4817A is the Low Band 33-50 MHz board. JU1001 connects Switched B- to the internal casting.
• The VHF HLN4240A (used in T53 and T83 radios) has no jumpers. Also the 800 MHz TRN8862A has no DVP or HHCH jumpers. So neither one supports DVP or the HHCH. It does appear the jumper functions could be reproduced and hard wired as a custom board modification.
• The VHF YLN4197A (used in T53VXJ and T83VXJ radios) has no jumpers and only supports DVP. It was originally marked HLN4240A-SP700.
• HLN4838A is the VHF 150-174 MHz range II board.
• HLN4838B is the VHF 136-154.4 MHz range I board.
• HLN5106A is the VHF 150-174 MHz range II board.
• HLN5148A is the UHF 30 Watt board.
• HLN4797C is the UHF 78/100 Watt board.
• TRN8862A is the 800 MHz board. Jumpers JU951 and JU952 are removed in trunking radios.
• All of the VHF and the 800 MHz Common Circuits boards have a Meter Socket for a Motorola test set. See the service manual schematics for the metering information. The Low Band and UHF Common Circuits boards do not have a Meter Socket. (All of the Syntor X radios have a Meter Socket on the Receiver RF Board and a Meter Socket on the Personality Board).
• Click here for a Low Band jumper locater.
• Click here for a VHF jumper locater.
• Click here for a UHF jumper locater.
• Click here for an 800 MHz jumper locater.
• The low band seems to be picky about the compensation adjustment, much more than the VHF, UHF or 800 MHz radios. The low band does use a unique reference modulation circuit not found in the other radios. The compensation adjustment instructions are in the front part of the low band manual under the "Maintenance and Troubleshooting" section and is really easy to do after you find R628 hiding near a corner of the RF board. The problem I ran into was I could not adjust the deviation on one radio above 4.6 KHz until after I did the Compensation adjustment (the deviation pot was at maximum). After the compensation adjustment I had to turn the deviation adjustment down to get it below 5 KHz deviation.
• All of these Common Circuit Boards have adjustable controls for Power Amplifier (PA) output power, Deviation and Compensation. All of them except the 800 MHz board also have Current Limit. The PA, Deviation and Compensation adjustments are accessed from the top of the radio (where the top is opened with the push button). Placing a piece of tape over the compensation adjustment hole is recommended to prevent accidental adjustment. The Current Limit control is not accessible from the top of the radio.
• Whenever a control is not accessible from the top of the radio it can be accessed from the bottom of the radio by loosening 3 screws (not the hinge screws) on the Common Circuits Board and hinging the board up. This will separate the PC board heat sink from the radio chassis so be careful not to burn yourself or run it for extended periods of time this way. Sometimes, the control can be accessed from the solder side. This depends on how the control was constructed (some do not have an adjustment slot on the bottom so they are not accessible).
• The VHF HLN4240A and YLN4197A are unique, they has two PA power adjustments. One for the regular high power range and another for the low power range. The low power range PA adjustment is not accessible through the top of the radio (where the top is opened with the push button). The code plug must be programmed for low power before the low power PA adjustment will have any effect.
• Click here for a Low Band control locator.
• Click here for a VHF control locator.
• Click here for a VHF HLN4240A hi/low power control locator.
• Click here for a UHF control locator.
• Click here for a 800 MHz control locator.

Hand Held Control Head HLN4728 circuit board jumper settings and locators:

Hand Held Control Head (HHCH) HLN4728F, G and H Revisions Control Board Jumpers
Jumper	HLN4728	Description
JU101	IN	Allows storage of non-priority scan list
	OUT	Special applications
JU102	IN	Numeric display
	OUT	Alpha-numeric display
JU103	IN	Power up return to last selected mode
	OUT	Power up on mode 1
JU104	IN	8 and 32 modes
	OUT	16 and 64 modes
JU105	IN	8 and 16 modes
	OUT	32 and 64 modes
JU106	IN	Secondary priority light to flash at slower rate
	OUT	Primary and secondary priority light to flash at same rate

• Click here for the HLN4728 control board jumper locator.
• Dual priority scan (i.e. primary priority and secondary priority scanning) is only available in 8, 16 and 32 modes.
• Remember, this Control Board mounts upside down over the Personality Board and it must be installed for the HHCH to operate. The HHCH requires a special radio cable and a HLN4894A Junction Box if Securenet is used.
• The HLN4915A, HLN4760 A, B or C revision Personality Board and the Common Circuits Board must have their jumpers set for HHCH operation.
• The alpha-numeric display is 2 characters and uses some upper and some lower case letters to display the selected mode bank.

HLN4270A and HLN4270B DVP Interface Board jumper settings:

HLN4270A and HLN4270B DVP Interface Board Jumpers
Jumper	Position	Description
JU300	IN	Sidetone
	OUT	No Sidetone

• The highlighted jumper selections are the normal jumper positions.
• These boards are small and the jumpers are well marked so I did not do a jumper locator drawing.

HLN4425A DVP Interface Board jumper settings:

HLN4425A DVP Interface Board Jumpers
Jumper	Position	Description
JU1	IN	Sidetone
	OUT	No Sidetone

• The highlighted jumper selections are the normal jumper positions.
• This board is small and the jumpers are well marked, so I did not do a jumper locator drawing.

HLN5008A DVP Interface Board jumper settings:

HLN5008A DVP Interface Board Jumpers
Jumper	Position	Description
JU1	IN	Sidetone
	OUT	No Sidetone
JU2	IN	EMS rear control head
	OUT	Normal position
JU3	IN	Normal position
	OUT	EMS rear control head or Singletone

• The highlighted jumper selections are the normal jumper positions.
• This board is small and the jumpers are well marked, so I did not do a jumper locator drawing.

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