- PERSONALITY BOARD
		- Personality Boards Information
			- Cable Connector Pin Locator
			- HLN4270A DVP Interface Board and Tx Audio Routing
			- HLN4270B DVP Interface Board and Tx Audio Routing
			- HLN4425A DVP Interface Board and Tx Audio Routing
			- HLN5008A DVP Interface Board and Tx Audio Routing
		- J401 Common Circuits Board Connector
		- J103 Optional HLN5008A Interface Board Connector
		- Microprocessor Part Numbers
		- Motorola Manual Errata
	- Syntor X Home
	- HOME

Personality boards information:

The Personality Board is the Syntor X printed circuit board which contains the radio's microprocessor, memory module, J1 cable connector, PL/DPL encoder/decoder, optional DVP Interface Board support and the receiver audio section. Some Personality Boards also have the optional Hand Held Control Head processor board support. All the Personality Boards have a high/low Tx power select control bit, but only specially equipped VHF radios make use of this control. Most high/low radios cannot reduce the maximum high power setting by any more than one half on low power (i.e. 110/55 watts or 40/20 watts). However, there is also a special 110/10 watt high/low power VHF radio.

The HHCH support mentioned below only refers to the specific HLN4728 Interface Board version of the HHCH. The HLN4728 Interface Board must be installed inside the Syntor X radio drawer, above the Personality Board. This requires the Personality Board to have special jumpers and connections just for the HLN4728 Interface Board (i.e. the HHCH support mentioned below). There are other versions of HHCH radios that use an external SIU that will potentially work with any Personality Board. Therefore, if you see a notation that the HHCH is not supported, keep in mind it only refers to the internal HLN4728 Interface Board HHCH.

There are different versions of these boards. HLN4915, HLN4760, HLN4257 and TRN8861 are all Motorola part numbers for the conventional Syntor X Personality Boards.

The HLN4915A Personality Board is for low band radios only (models starting with T51 and T71). The only difference between the HLN4915A and HLN4760A is on the HLN4915A, inductor L2 is replaced with a wire and Q4 uses a different transistor part number. The later HLN4760B and HLN4760C Personality Boards added a built in jumper header to optionally bypass L2 in low band radios and they use the same Q4 part number as the HLN4915A. See the HLN4760 A, B & C description below form more information on this board.

The HLN4760 A, B & C Personality Boards are typically used in Low Band (B and C only), VHF and UHF Syntor X radios. These boards and the HLN4915A are the only boards that support the HLN4728 Hand Held Control Head (HHCH) interface board and the HLN5008A DVP Interface Board. They do not support the special 110/10 watt power selectable VHF radio because the HLN5008A is missing the control relay interface (a custom setup could be made). The HLN4760 boards are also used in special application radios that normally would use different Personality Boards (i.e. an 800 MHz radio with DVP). The HLN4760C is the only Syntor X Personality Board board that can support DVP-XL.

The HLN4257A Personality Board is typically used in the VHF T53 and T83 Syntor X radios. This board does not support DVP or the Hand Held Control Head. This board can support the HLN4270A, HLN4270B and HLN4425A DVP Interface Boards, but is lacking the header pin connectors (see HLN4257B below). This Personality Board does support the special 110/10 watt power selectable VHF radio when a DVP Interface Board is installed (a very special RF PA deck is also required), however, only the 110/10 watt power control part of the DVP Interface board is used.

The HLN4257B (also known as HLN4257A-SP700) Personality Board is typically used in the DVP "VXJ" versions of the VHF T53 and T83 Syntor X radios. This board does not support the Hand Held Control Head. This board does support the HLN4270A, HLN4270B and HLN4425A DVP Interface Boards This Personality Board is the same as the HLN4257A board (see above), except it has header pins installed on it to plug in the HKN4117A cable for the HLN4425A DVP Interface Board or the cable for the HLN4270A/B DVP Interface Board. This Personality Board does support the special 110/10 watt power selectable VHF radio when a DVP Interface Board is installed (a very special RF PA deck is also required).

The TRN8861 Personality Board is typically used in the 800 MHz Syntor X radios. This board does not support DVP or the Hand Held Control Head. It is the only board that uses the clock signal from the receive RF board instead of having its own microprocessor crystal (there is no Y1 crystal next to the 40 pin microprocessor chip, which can also be used to identify this board if the part number tag is missing).

SYNTOR X Radio J1 Connector (Negative Ground)
J1	HLN4915A HLN4760 A & B HLN4257B	HLN4760C	HLN4257A TRN8861A	Cable Wire Color	Description (HLN4728 Interface)
A				Red	A+
B				Black	A-
1				VIO	Control Head Strobe (Output)
2				BLK-BRN	Detected Audio (Output)
3				BLK-GRN	Volume - Receiver Audio (Input)
4				BLU-ORG	PTT (Input)
5	PTT ref	PTT ref / DVP XL	PTT ref	BLK-RED	PTT Reference (Input) or  DVP XL  (Output) (J21, R33)
6				RED-ORG	Squelch Tail (Output)
7	DVP	DVP	spare*	RED-BRN	Securenet Modulation (Input)
8					Switched B-
9					Switched B+ to Accessories
10				BLK-VIO	Chassis
11				WHT-VIO	Mode 12 (I/O) - HHCH List
12				WHT-BLK	Mode 5 (I/O) - HHCH Up
13				BLU	Mode 1 (I/O) - HHCH Sys On
14				Shield	Shield
15				YEL	Switched B+ (Input)
16				WHT-BRN	Mode 6(I/O) - HHCH Clock
17				WHT	Mode 2 (I/O) - HHCH Program
18	spare	spare	spare		Unused - HHCH Ignition
19				WHT-GRN	Mode 10 (I/O) - HHCH +5 Volts
20					Transmit Indicator (Output)
21	DVP	DVP	spare*	RED-GRN	Transmit Mode (Input)
22				GRN	Speaker Audio Low (Output)
23				WHT-RED	Mode 7 (I/O) - HHCH Data
24				GRY	Mode 3 (I/O) - HHCH Squelch Disable
25				BLK	Mode 4 (I/O) - HHCH Down
26				WHT-YEL	Mode 9 (I/O) - HHCH PL On/Off
27				BLK-YEL	Mic. Hi (Input)
28				BRN	Squelch (Input)
29				WHT-ORG	Mode 8 (I/O) - HHCH Jumper to 32
30				WHT-BLU	Mode 11 (I/O) - HHCH CH Strobe
31				WHT-GRY	Channel Scan Enable (Input)
32				BLK-BLU	PL/DPL Disable (Input)
33	Disp En	DVP XL	Disp En	BLK-GRY	Display Enable (Input) or  DVP XL (Input)
34	DVP	DVP	spare*	RED-BLU	Sidetone In (Input)
35	DVP	DVP	spare*		EMS Mute (Output)
36	DVP	DVP	spare*	RED-YEL	Transmit DVP (Input)
37				ORG	Speaker Audio Hi (Output)

• Input indicates information/control signals being sent to the radio.
• Output indicates information/control signals being sent by the radio to control heads, accessories, etcetera.
• I/O (Input/Output) indicates information/control signals being sent by the radio and sent to the radio (i.e. two way data flow).
• Spare indicates this pin and signal is not used by this Personality Board.
• Spare* indicates this pin and signal is not used by the HLN4257A Personality Board. It may however be used by the HLN4257B or HLN4257A-SP700 Personality Board.
• Here is a pin locator drawing for the solder side of the radio's J1 cable connector. It is accessed by opening the radio handle, pushing the button to release the top cover and removing the cover.
• DVP and DVP XL indicates radios with the HLN5008A DVP Interface Board ("VXJ" models) use these pins to support DVP or DVP XL on the C revision board. When the HLN5008A DVP Interface Board is not present then they are spare lines. "VBJ" radios should be checked to see if they are really "VXJ" models by looking for the HLN5008A DVP Interface Board located on the Personality Board.
• For pin J1-5, on the HLN4760C Personality Board J21 and R33 selects PTT Reference or DVP XL. This pin is only PTT Reference on all other Personality Boards.
• For pin J1-33, on the HLN4760C Personality Board this pin is changed to DVP XL. This pin is only Display Enable on all other Personality Boards. Because the Display Enable cable wire is missing on the revision C Personality Board, Display Enable is only controlled by jumper JU14.
• The alternate Hand Held Control Head (HHCH) functions are shown for the HLN4915 or HLN4760 Personality Boards with the internal HLN4728 HHCH Controller Board installed. The Personality Board U5 and U7 sockets are used by the HLN4728 HHCH Controller Board.
• The actual encrypted DVP audio is generated externally and hooked up to the Syntor X radio. An optional HLN4425A HLN4270A, HLN4270B or HLN5008A DVP Interface Board must be installed to be able to hookup and use DVP. The HLN4915A and HLN4760 (all revisions) are the only conventional Syntor X Personality Boards that support the optional HLN5008A DVP Interface Board.
• The HLN4760C with the HLN5008A DVP Interface Board is the only conventional Syntor X Personality Board that supports DVP XL.
• The pins marked DVP require a HLN4270A, HLN4270B, HLN4425A or HLN5008A DVP Interface Board to support them. You can also make your own custom packet support modifications. The HLN4270A is missing the Reverse Burst Control (also its Tx Control, Tx Control Enable) and Detector Mute support. The HLN4270B is missing the Reverse Burst Control (also its Tx Control, Tx Control Enable) support. The HLN4425A is missing the Detector Mute support. The HLN5008A is missing the 110/10 Watt Power Control support. The various drawings in the above links should help you understand the different configurations of these boards. These DVP Interface Boards are only meant to be used with various options (DVP, MDC-600, MVS-20, etc.) and require special setups when this optional hardware is removed (just look at what a missing JU8 does to the PL/DPL enable when a DVP Interface Board is installed without its optional equipment, as in you loose all Tx PL/DPL until JU8 is restored). When a DVP Interface Board is not present all of its connections from the J1 main radio cable connector to the rest of the radio are broken.
• Pin J1-7 Securenet Modulation audio path is shown in this drawing (it is good enough to illustrate the audio path even if you have a different DVP Interface Board). It is also used as a Detector Mute input when the MVS-20 (Mobile Voice Storage) option is installed.
• Pin J1-20 Transmit Indicator is not used by most Syntor X radios. This signal originates on the HLN4240A (T83, T53 VHF Range 2) Common Circuits Board and the HRN8862A (T45VBJ7000 800 MHz Conventional) Common Circuit Board, however, I have yet to find even one of these radios that actually installed the Q909 (VHF) or Q955 (800 MHz) Transmit Indicator transistor on the common circuits board. Also I have yet to find any System 90*s equipment that uses the Transmit Indicator signal. For packet/modem use this pin can be jumpered (short pin 9 to pin 19 on the Common Circuits Board J401 connector solder side) on the common circuits board to the Channel Activity line. This will make this pin become J1-20 Channel Activity.
• Pin J1-21 Tx Mode is only supported when a HLN4425A or HLN500A DVP Interface Board is installed. The HLN4270A and HLN4270B do not support remote control of the PL/DPL reverse burst function (see the HLN4257B column above).
• Pin J1-27 Mic. High audio path is shown in this drawing. Just ignore the gray HLN5008A DVP Interface Board.
• The Received Audio Shaping (RAS) is all done after the volume control and in the circuits where audio squelch muting takes place, so there is no external received filtered audio output connection. The only external audio is the flat J1-2 Detected Audio.
• Pin J1-34 Sidetone audio is shaped by the DVP Interface Board. It is not suitable for normal audio sources. It is intended to allow options like a DVP control head send an audible warning tone to the radio's speaker (like when you attempt an encrypted Tx , but you do not have an encryption key loaded, etc.). Consider it to be an external connection version of the radio's built in internal alert tone.
• With some creative wiring, the DVP data path to the radio's modulator can be hooked up for packet data (even in systems without the optional HLN5008A, HLN4425A, HLN4270B or HLN4270A DVP Interface Board). There is no 300-3000 Hz filtering and the low frequency modulation is only limited by a 10 uf capacitor which is ideal for high speed, high bandwidth, packet communications. The transmitter modulation is also true reactance frequency modulation, not phase modulation, so the low frequency bandwidth is not limited by the modulation technique.
• All of the above Personality Boards plug into any conventional Syntor X radio in the same way so they are all physically interchangeable.
• Some radio Personality Boards are missing the I/O Board and are not capable of encoding or decoding PL or DPL. The unified chassis number identifies these radios as "Carrier Squelch".

Since I do not have any DVP XL manuals this information is incomplete.

The HLN1125A Orange Label Memory Modules used in early model radios increase the standby current by 40 ma nominal, 60 ma maximum. The HLN1125B used in later model radios does not increase the standby current.

For Personality Board jumper settings see the Radio Jumper Settings section.

J401 Common Circuits Board Connector
Pin #	Description
1	Tx Data Enable (Input)
2	Tx Data (flat audio modulation, no deviation limiter or bandwidth filtering) (Input)
3	Tx PL/DPL (Input)
4	Tx PL/DPL Enable (Input)
5	Mic. High (Input)
6	Mic. Enable (pre-emphasized with deviation limiting and bandwidth filtering - IDC) (Input)
7	Synthesizer Adapt (Input)
8	Keyed 9.4 volts (Input)
9	Transmit Indicator (SP option) (Output)
10	PA Enable (Input)
11	Switched + 9.6 Volts (Output)
12	Switched + 5 Volts (Output)
13	Switched B- (Ground)
14	VCO Modulation (Output)
15	Switched B+ (from control head power switch) (Input)
16	Squelch (Input)
17	Reference Modulation (Output)
18	Tx High/Low Power Control (optional) (Input)
19	Channel Activity (Output)
20	Squelch Tail (Output)

• Input indicates information/control signals being sent from the Personality Board to the Common Circuits Board.
• Output indicates information/control signals being sent from the Common Circuits Board to the Personality Board.

J103 Optional HLN5008A Interface Board Connector
Pin #	Description
1	Reverse Burst PL Enable (also called EOM Enable) (Output)
2	Switched + 9.6 Volts (Input)
3	Transmit DVP (shorted to J103 pin 4 on HLN5008A) (J1 pin 36) (Input)
4	Data Enable (shorted to J103 pin 3 on HLN5008A) (J401 pin 1) (Input)
5	Priority Sample Mute (also called EMS Mute) (Input)
6	Sidetone Input (J1 pin 34) (Input)
7
8	Transmit Mode (J1 pin 21) (Input)
9	Detector Mute Control (used with Mobile Voice Storage option) (Output)
10	PL/DPL Enable (J401 pin 4) (Output)
11	Keyed 9.4 volts (Input)
12	Switched B- (Ground)
13	EMS Mute (J1 pin 35) (Output)
14	Sidetone Out (Output)

• Input indicates information/control signals being sent from the Personality Board to the HLN5008A Interface Board.
• Output indicates information/control signals being sent from the HLN5008A Interface Board to the Personality Board.
• The HLN5008A board is optional and can only be used on the HLN4915, HLN4760A, HLN4760B and HLN4760C Personality Boards.
• J103 pin 3 and 4 are shorted on the HLN5008A board. Personality Board jumper JU8 (Data Enable) is also connected J103 pin 4. The HLN5008A takes these signals and outputs the PL/DPL Enable from them. If you remove the external options the HLN5008A originally supported from the control head stack, then jumper JU8 must be installed to restore Tx PL/DPL.

Personality Board U8 Microprocessor Part Numbers
HLN4257A/B	HLN4915A	HLN4760A	HLN4760B	HLN4760C	TRN8861A
51-82807K56	51-97009C01	51-97009C01	51-97009C03	51-97009C04	51-82807K56
51-82884K56					51-97009C01
51-97009C01

• These are the known part numbers that were found in the manuals.
• When more than one part number is listed in a column, they are listed in chronological order. The oldest part numbers are at the top of the column with the newer replacement part numbers below them. The most recent known part number is the last one listed in the column.
• Part number 51-82884K56 was updated to part number 51-97009C01. The change had to do with scanning receive modes that have PL or DPL coded squelch. I have not found any documentation on what any of the other part number changes were for, however, I suspect 51-97009C04 is the only microprocessor that can correctly support DVP-XL.
• Sometimes a U8 chip will only have a partial Motorola part number on it (i.e. "09C01" is a common marking for the 51-97009C01 part). The microprocessor is a 3870 device with a built in 4k byte ROM. A 3870 number can usually also be found on these chips.
• Keep in mind this information comes mostly from the manuals and not real Personality Boards. I already found a HLN4760B with a 51-97009C04 on it. There may also be missing U8 part numbers that never made it into a manual.
• All of the chips listed above are only for conventional Syntor X radios.

Motorola manual errata:

The circuit board diagrams (the 2 color drawing of the PC board traces) in manual 68P81060E05 are not numbered correctly for J4 (1 is really 3 and 3 is really 1). Or possibly J4 on the schematic is not numbered correctly. You should be aware of this if you are making packet modifications.

Jumper JU8 on the HLN4760 Personality Boards is also connected to J103 pin 4. It is drawn in the schematic, but you have to match up J401 pin 1 from opposite sides of the drawing yourself (i.e. the exact same J104-1 connection is shown separately in two different places in the schematic, so the schematic is accurate, but confusing). J401 pin 1 is the modulation "Data Enable" control line. On "VXJ" radios J103 pins 3 and 4 are shorted by the HLN5008A board, connecting JU8 to J1-36 (Transmit DVP). This is why installing JU8 will restore normal voice and PL/DPL operation operation on "VXJ" radios that do not have external DVP hardware any longer. Here is an illustration with the connector-pin numbers. J401 is the ribbon cable that connects the Personality Board and Common Circuits Board. J103 is the HLN5008A DVP Interface Board connector. This same JU8 to J1-37 connection is also made by the HLN4270A, HLN4270B and HLN4425A DVP Interface Boards via their cables.

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