|TABLE OF CONTENTS - DETAILED CONTENTS|
|- NEW RADIO INSPECTION|
|- SYNTOR X 9000 CONVERSIONS|
|- CONTROL HEADS & ACCESSORIES|
|- MODE SELECT CONTROL HEAD MODIFICATIONS|
|- CONTROL HEAD INTERFACE|
|- PL/DPL UNDER CONSTRUCTION|
|- TRANSMITTER TIME OUT TIMER|
|- EXTENDED FREQUENCY MODIFICATIONS|
|- PACKET HOOKUP UNDER CONSTRUCTION|
|- PERSONALITY BOARD|
|- RADIO JUMPER SETTINGS|
|- 64 MODE SYNTOR X|
|- CANADIAN SYNTOR X|
|- SYNTOR X VISUAL TOUR|
|- PL / CTCSS INFORMATION|
|- DPL / DCS INFORMATION|
|- PAC-PL and PAC-RT VEHICLE REPEATERS|
|- HAND HELD CONTROL HEAD|
|- PROM PROGRAMMERS|
|- RADIO WIRING|
|- WEB LINKS|
|- SURPLUS PARTS GUIDE|
|- ITEMS FOR SALE|
|- WEB SITE REVISIONS|
The following information is intended to assist in resurrecting and using conventional Syntor X radios. Please be sure to completely read the home page first.
I am repeating a warning label found on most, but not all Syntor X radios next to the radio's J1 cable connector (2 large pins and 37 smaller pins). It states "CAUTION, DC Power must be off before cable is plugged in or electrical damage could occur". Simply remove the power fuses before installing the cable J1 connector. The fuses are replaced after the cable connector is installed. The only reason I mentioned it is I have seen several Syntor X radios that are missing this warning label. The emphasis here is on could occur, however, better safe than sorry.
The Syntor X has so many RF assemblies in common with the Syntor X 9000 that there is even an early manual supplement to the Syntor X VHF and UHF manuals (68P80100W94) that was used to convert the VHF and UHF Syntor X manuals into Syntor X 9000 manuals.
Any prices for Motorola parts shown on this page are examples of the Motorola new retail price at the time this page was written. Please see the home page for details and links to the Motorola part number search engine. If you have the Motorola part number (many are provided on this web site or found in the Motorola manuals) you can lookup the current retail price yourself.
New Radio Inspection:
The following steps are for a "new" (i.e. a newly acquired used radio) Syntor X radio. These steps should be completed before installing the radio or applying power to it.
Please check out the Syntor X visual tour for photographs of the radio.
When you get a "new" Syntor X radio, the first thing is a visual inspection of the exterior, then unlock the handle and open the top lid using the push button. This will give you a view of the solder side of the Personality Board and RF board. Check your Motorola radio service manual or this drawing to help identify the solder side pins from the J1 connector (the one the radio cable plugs into) on the Personality Board. Look to see if there are any jumper wires soldered to any of the J1 pins. If you find any jumper wires, identify the J1 pin number and look them up here. The main worry is too make sure no jumpers have been installed on any of the pins carrying power (i.e. J1-A, J1-B, J1-8 or J1-10). It is not probable, but it is possible a radio removed from a positive ground vehicle could have jumpers here that will short out when installed in a negative ground radio installation. If you find any jumpers on the power pins then either remove them or verify they will not cause any problems before powering up the radio. It is also possible jumpers may be installed as a repair for a Personality Board with damaged PC board traces. Because the HLN4257 and TRN8861 Personality Boards lack jumper JU14 Display Enable, it is common to find these with the solder side of J1 pin 33 jumpered to ground, which duplicates the function of installing jumper JU14.
This is a good time to locate the "loss of lock indicator" light. This is a LED mounted under a hole in the RF board. The radio service manual has a picture of its location in the Description & Operation section. While operating, when the indicator is lit it means the radio's frequency synthesizer is not locked on frequency. It is normal for it to flash when changing modes or pressing the PTT. It appears to be lit while scanning, but is usually flashing so fast from frequency changes that it is an optical illusion. Whenever you program new frequencies into the radio, this indicator is used to make sure the radio synthesizer can lock onto the new frequencies.
Next, check the radio cable and make sure it is a negative ground cable with the part number or with an ohm meter (pin A should be connected to the large red wire and pins B, 8 and 10 should be connected to the large black wire).
Now close the top lid, remove the radio from the mounting tray (if you have not already done so), turn the radio over, loosen the 4 screws and remove the bottom cover. On the side with the J1 connector you will find the Personality Board. There may be a small white tag stuck to the Personality Board with the part number on it. If you can locate the tag, it will give you the part number and revision (i.e. HLN4760B2, HLN4257A1, etc.). Check here to verify the part number you find is for the Personality Board. If you can not locate the tag use the jumper locator drawings to identify the board part number (one drawing should match your board). If you can not match the Personality Board by part number or to a jumper locator drawing it is probably a trunking radio.
If your radio still has the unified chassis number tag or ink stamp, it should be on the bottom edge of the chassis near the J1 connector. Here is the location photo.
If you have any of the HLN4915A, HLN4760A, B or C Personality Boards check the appropriate jumper locator drawing and confirm the J6 jumper plugs are correctly installed. If they are not installed correctly, refer to your radio service manual Personality Board schematic and its note 6 to double check everything before changing them, check the solder side of J6 for soldered jumpers and look for any indications of modified power wiring in the radio cable. Every Syntor X radio with J6 that I have opened has had these jumpers in their correct position. If you find they are not in the normal positions then it is a big warning flag that the radio may have modifications to its internal or external power distribution wiring.
If you have the HLN4760C Personality Board keep in mind the the radio cable connector J1 pin 33 was changed to a DVP-XL line, and J1 pin 5 can be jumpered as a DVP-XL line with J21 and R33, so special radio cable wiring may be required just for your radio. Radio cables originally used with Personality Boards other than the HLN4760C may not be wired correctly for use with the HLN4760C Personality Board. The examples from the Cables page have notes on the correct wiring.
If any PC boards are mounted upside down above the Personality Board (similar to the way the Common Circuits Board is mounted over the RF Board) then you may have a trunking radio or a radio with the HLN4270A DVP Interface Board or HLN4270B DVP Interface Board or HLN4425A Interface Board or a radio with the HLN4728A Hand Held Control Head (HHCH) Interface Board. The exception is the low band radios all have a Transmitter Buffer Board mounted above the rear of the Personality Board (opposite from the J1 connector end). The HLN4270A / HLN4270B / HLN4425A Interface Board can be used for a variety of options (EMS rear control group, Single Tone Encoder control head, MDC-600 control head retrofit and VHF 110/10 watt radios). If you do not have any these options then this Interface Board and its cable should be removed as it will interfere with normal conventional radio operation (jumpers may also need changing). This is only a problem when a radio gets mixed up with the wrong control heads or separated from its original control heads as can happen with used radios. If you do have one of the options, then this Interface Board is required for them to operate correctly so it should not be removed. The HLN4728A HHCH Interface Board is mounted above the front of the Personality Board (near the J1 connector end). It is required for radios with a Hand Held Control Head. If the extra board(s) are not HLN4270A, HLN4270B, HLN4425A, HLN4728A or low band Tx Buffer boards, there is a variety of ways to identify trunking radios and their Personality Boards.
This is also a good time to check the Personality Board jumper settings and write them down. Your radio could be jumpered for an optional configuration that you may not have the hardware to make use of.
If the Personality Board has a small circuit board mounted vertically behind the ribbon cable connector, it should be the HLN5008A Interface Board. If you have a board mounted upside down over the Personality Board then see if it is the HLN4270A / HLN4270B / HLN4425A Interface Board. These boards are present in radios with "VXJ" in their model number, but they can be added to "VBJ" models in the field. If you have either board treat the radio as a "VXJ" Securenet capable radio even if the model number has "VBJ" in it (these boards are the difference between a "VBJ" and "VXJ" model radio). These boards can also be used for EMS, Single Tone Encoder and MDC-600 interfaces instead of the HLN4270A (the HLN5008A can not substitute for the HLN4270A / HLN4270B / HLN4425A in the special T83 model 110/10 watt radios).
You will also be able to see the Memory Module plugged into the Personality Board. If it has a white label it should be a one time only programmable PROM module and if it has a orange label it should be a re-programmable EEPROM module. Here is the location photo.
Last, make a visual inspection of the inside of the radio. Because of the seals on the covers and J1 connector, these radios are usually sparkling clean inside, even when the outside looks abused.
Make sure you follow the Motorola radio service manual installation instructions and fuse all the power leads.
If you correct any problems found by the above "new" radio steps, it should be OK to apply power to the radio. I used to just power up my "new" radios without doing all of this and I never had a problem. However, there is slight possibility you might get a radio with a strange configuration which the above steps should catch.
Syntor X 9000 Conversions:
This information is located on the Syntor X 9000 pages. This link has information on the differences between the Syntor X and Syntor X 9000. This link has the actual conversion instructions along with additional information.
PL, Private Line, DPL, Digital Private Line, MPL, Talkaround, MDC-600, MDC-1200, MVS-20, Securenet, Smartnet, Privacy Plus, Trunked X2, Trunked X3, Touch Code, Quick Call II, Channel Scan, Talkback Scan, System 90, System 90*s, Systems 9000, Mitrek, Micor, Spectra, MataTrac, Syntor, Syntor X, Syntor X 9000 and Syntor X 9000E are trademarks of Motorola Inc.