Platform service
Elwin Security repairs and replaces Mircom TX3 telephone entry systems at Bay Area multifamily and commercial properties: the TX3-120, TX3-200, TX3-1000 and TX3-2000 lobby control units, the TX3 Touch panels, and the TX3-NSL-8M relay cabinets behind them. The work covers the main controller board, LCD display, relays, the ADC, NSL or VoIP path, and Configurator software.
Use case
Each situation below has a different fix, and the model suffix, the controller board and the phone path decide which one applies.
Mircom's TX3-ATA data sheet says telecom carriers are accelerating the transition from PSTN, also called POTS, to IP communications. Its MiVoIP service is designed to replace traditional phone lines, needs the TX3-ATA adapter, and requires a subscription through Mircom's MiConnect portal. The TX3-MDM modem module is designed to work only with POTS (plain old telephone system) lines.
Mircom's FAQ ties a blank display with the backlight on to a poor ground, and its fix is a chassis ground under 50 ohms and a power cycle. For ADC calls that disconnect or dial partially, the same FAQ limits one tip and ring line to a maximum of 4 telephone access units. Mircom publishes installation instructions for replacement TX3-NSL-8M boards.
Mircom's manual lists a main controller board for 200 residents on the TX3-120 and TX3-200 models, 1000 on the TX3-1000 models, and 2000 on the TX3-2000 models. A TX3-NSL-8M backplane holds up to eight 2012 relay boards of 12 relays each, 96 in total, and the TX3-8EC and TX3-16EC expanders add room for 8 or 16 more boards.
Service focus
Mircom's documents set what each path requires, so the first job is to identify the model number, its suffix, the controller board and the firmware version.
For the TX3-TOUCH-S15B-WR and S15S-WR, Mircom publishes replacement PC board, display, inner chassis, RPL-LK-WR lockset, and camera and card reader window procedures.
The TX3-ATA is a Grandstream HT801 analog telephone adapter that connects by telephone cable to the TX3 lobby unit or TX3 Touch and by its Ethernet port to the building's internet connection. Activation on MiConnect needs the building name and address, the adapter's MAC address and its serial number, and Mircom states the adapter is for voice entry panels only and cannot call 9-1-1. The cited Mircom MiVoIP FAQ lists a warranty timeline of one year from date of purchase.
Models ending in -256 do not support the TX3-IP module; each Ethernet device needs a TX3-IP-256 or TX3-IP-NP-256 IP adapter module. When the property wants a video intercom instead, Elwin replaces the TX3 panel.
Service check
A model number on the faceplate is not enough. The suffix, the board inside and the phone path decide which Mircom parts, gateways and software versions will work.
Faceplate model and suffix, controller board (for example MD-1245 or MD-1398), and firmware version. An old TX3 lobby unit with MD-1245 on the same network as a new 256 lobby unit must have firmware version 3.7.x or higher.
ADC line, NSL cabinet, or TX3-ATA. Which line each panel uses, the number of panels sharing a tip and ring line, and whether a modem module is still in use on a POTS line.
The power supply connection receives 16 Vac, 40 VA, and an external PS-4 or PS-4P plug-in transformer connects to the power terminals. The 16-gauge chassis ground wire Mircom ships with the panel, and whether an outdoor unit sits under the 2 m overhang its manual calls for.
Which output drives which door or gate, how JW8 is set, whether Input 2 is tied to the fire panel, and the resident count against the 200, 1000 or 2000 the installed board supports.
Scope details
The board, the phone path, the relays and the programming are what a repair touches.
SW1 sets the unit's RS-485 ID and IP addressing mode, and SW2 turns the unit's power ON and OFF for servicing. Mircom's manual states that when the major or minor firmware version is updated, the configuration resets to default values, so the job file is backed up before any board or firmware work.
An ADC connection requires a dedicated subscriber telephone line service, while NSL stands for no subscriber line. A single panel supports up to five ADC and/or NSL telephone lines, and non-configurable PBX systems are not supported. Before an NSL install, Mircom's quick reference calls for verifying that the building telephone infrastructure is operational, and it may be necessary to check each resident's line.
The door strike supply is customer supplied, limited to 28 VAC or 30 VDC at 1 A, and must come from its own transformer; an AC strike will not work from a DC supply. Outputs 2 to 4 are relay contacts rated 125 VAC at 2 A and 30 VDC at 1 A. Input 2 connects to the fire alarm panel and unlocks the main and auxiliary doors while that input is active, and your fire marshal or local AHJ decides what release behavior and egress hardware are acceptable.
Process
The process keeps repair decisions tied to Mircom's published compatibility rules.
Record the model, suffix, board, firmware version, phone path and relay wiring, and test calls, keypad, display and release at the panel.
Result: The quote names the exact Mircom part, gateway or kit, not a generic intercom repair.
Match the failure to Mircom's parts list and compatibility tables: a replacement board or display, a TX3-ATA with a MiVoIP subscription, a -256 panel with its IP gateway, or a new system.
Result: The property knows what the fix costs and what it leaves in place.
Back up the job file, install the part or system, upgrade firmware and Configurator versions where Mircom's tables require it, load the directory, test each relay and call path, and show the property team how programming works.
Result: The entry works and the property can manage its own directory.
Field proof
Photos of entry release hardware.
Mircom's -256 supplement marks the MD-951 lobby board, the MD-934 card access board and the MD-955 elevator board as not compatible with the new controller boards, and its FAQ says no TX3 version 1 model may remain on the network before a -256 panel goes in.
Mircom's technical bulletins page lists a FlexNet FX-2000N end-of-life notice and a white doors and enclosures discontinuation notice, with no bulletin mentioning TX3.
Mircom's manual lists FCC registration 1M8TE00BTX3 and an AC REN of 0.0B for the TX3.
An electric strike with the faceplate off. Mircom's manual says the door strike must have its own separate power transformer, not the system power transformers.
Closer, frame contact and cable-fed lock on a mesh entry door.
Yes, two ways. Mircom's TX3 can be configured as a no subscriber line (NSL) system, and the TX3-NSL-12K kit includes a TX3-NSL-8M relay cabinet. For an internet connection, Mircom's TX3-ATA adapter with a MiVoIP subscription is designed to replace the phone line, and Mircom states the adapter cannot call 9-1-1.
Service request
Tell Elwin what is not working, what systems are already on site, and which access points matter most. The next step is a scope grounded in the building, not a generic product list.
