Service Bulletin # Topics Product Description Product Model Numbers
SB-0055 Product manufactured after November 30, 2011 is not compatible with UDB flashing firmware revisions below v1.7.0.0. Firmware Flashing Software v1.7.0.0 for UDB Flash Memory Replacement
  • MT-4E family of products
  • UIC products
SB-0054 30W VHF Amplifier Transistor input power was 4W; new version input power is 6W.

IMPORTANT: Read front panel label.
30W VHF Amplifier - Transistor Change from Max. 4W Input Power to Max. 6W
  • AMP-2/150-30-00
  • AMP-2/145-30-00
  • AMP-2/155-30-00
  • AMP-2/170-30-00
SB-0053 MT-3 crystal radios are not compatible with motherboard (MB) v7 subracks. Enabling MT-3 Crystal Operation for SR-39-1 with v7 Motherboard
  • SR-39-1 (PCB 50016-07 or newer)
SB-0052 Some MT-4E receivers exhibit minor desense when a green-ended RJ45 cable is connected. Replace RJ Cable - Minor Desense Issue with MT-4E Receivers
  • CBLC46-12506015
  • CBLC46-12506020
  • CBLC46-12506025
  • CBLC46-12506032
  • CBLC46-12506042
  • CBLC46-12506050
SB-0046-1-0-0 MT-4D transmitters not changing channels or locking up during short calls; MT-4E transmitters slow to respond CI-RC-4M Firmware Versions
  • CI-4C-4M-00
  • CI-RC-4M-01
SB-0041-1-0-0 MT-4E Transmitters with an encryption module installed will not switch to secure mode when Local control is enabled. CI-BC-4E Clear / Secure switching while in Local mode - CI-BC-4E base control module
  • CI-BC-4E-00 with switch (PCB 50139-02)
SB-0029-1-0-0 Trouble changing channels with tone remote adaptor from a non-Telex/Vega tone remote. MT-4 Base Control Module
  • CI-BC-4E-00 (prior to s/n 10190)
SB-0022-1-0-0 Fails to generate test pattern for testing C4FM Modulation Fidelity All MT-4D TX's
  • All MT-4D Radios
SB-0018-1-1-0 Paging Modulator TCXO Short Paging Modulator Card
(Units with Raltron OCXOs with date codes less than 0610)
  • CI-PM-3-00
SB-0016-1-0-0 Fails to change channel until second PTT All MT-4D Radios
  • All MT-4D Family and Revisions
SB-0015-1-0-0 RSS MT-4D will display model number error when trying to read/write to MT-4D unit
All P25 Radios
  • All MT-4D Radios
  • All MT-4R Radios
SB-0013-1-0-0 RSS MT-4D will display runtime error when using USB to Serial adapter P25 Module Programmer
  • CI-MP-4-00
SB-0012-1-0-0 New Firmware upgrade to recognize Hexadecimal switch in MSB position Channel Programmer
  • CP-SC-3
SB-0011-A Component failure Paging Modulator Card
  • CI-PM-3-00
SB-0010-A P25 Module Programmer Intermittent Electrical Problems P25 Module Programmer
  • A55-CI-MP-4-00
SB-0009-1-1-0 Torque settings to correct loose RF Amplifier Board cap screws VHF 30 W Power Amplifier
  • AMP-2/150-30-00
SB-0008-A Fixing lock-up problem when the TX is powered up MT-4D Receivers programmed with RSS4D-R version 1.1
  • VR-4D150-R0-00
  • VR-4D420-R0-000
  • programmed with RSS4D-R version 1.1
SB-0007-A 8 W Amp Power output alarms VHF 8 W Amplifier included in the MT-3 VHF TX
  • VT-3/140x
  • VT-3/160x
SB-0006-A Power connection failure VHF, UHF 30 W power amps shipped prior to April 1995
  • AMP-2/150
  • AMP-2/450
SB-0005-A 8W Amp modification to prevent oscillation 8W 400 MHz TX Amplifiers
  • A23-UPA420-08
  • A23-UPA460-08
  • UT-3/420-CX0X00
  • UT-3/460-CX0X00
  • UT-3/460-SXCX00