Ericsson TMX - 8810 Maintenance Manual
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Ericsson TMX - 8810, LBI-39049 Mobile Communications TABLE OF CONTENTS RF BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . LBI-38866 INTERCONNECT BOARD . . . . . . . . . . . . . . . . . . LBI-38618 AUDIO BOARD . . . . . . . . . . . . . . . . . . . . . . . . LBI-38391 LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . LBI-38392 SYSTEM BOARD . . . . . . . . . . . . . . . . . . . . . . . LBI-31
C O M B O Copyright© February 1994, Ericsson GE Mobile Communications Inc. TABLE OF CONTENTS Page SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ericsson TMX - 8810, GENERAL DESCRIPTION The GE-MARC V•E TMX-8810 mobile is a synthesized, wideband radio that uses integrated circuits and microcom- puter technology to provide high performance trunked opera- tion. The radio provides 10 Watts of RF power output in the 806-821 MHz and 851-866 MHz trunking bands without re-tuning. The receiver will operate in the 851-866 MHz band without re-tuning. All radio functions are stored in a programmable electri- cally erasable PROM (EEPROM). The radio is field program- mable using an IBM compatible personal computer with the following equipment: • Serial Programming Interface Module TQ3370, �
Ericsson TMX - 8810, REMOTE MOUNT Remote Mount Option MA1U (19A705306628G2 & G3) allows controlling the main radio assembly remotely from the Front Cap Assembly. The Front Cap is removed from the main radio assembly and mounted to a rear housing containing an interface board with the option. A new Front Cap without con- trols or displays containing an interface board is mounted to the radio assembly. An 18-foot system cable is normally supplied for use between the two units. A 20-foot power cable is also supplied for the radio assembly. The shorting jumper must be placed on the TMX-8825 position of the remote mount kit. AC POWER SUPPLIES Two AC power supplies are available f
OPERATIONAL MODES The radio will always be in one of three operational modes: idle, wait, or ready. The three operational modes and the conditions that cause the radio to switch from one mode to another are shown in Figure 2. The radio enters the idle mode when power is turned on and begins scanning channels for incoming calls. The wait mode is entered when the user places a
Ericsson TMX - 8810, OPERATION CONTROLS The TMX-8810 trunked radio is equipped with the controls listed (see Figure 7). POWER Momentary switch. Press once to turn on the radio. Push again to turn off the radio. The radio will sound three beeps and the display will show PASSED followed by the area/group last selected. VOLUME Two momentary switches. VOLUME UP and VOLUME DOWN. Beeps are heard while stepping the volume on an inactive channel. No beeps are heard while receiving a channel. AREA Two momentary switches. Push AREA UP to increment to the next higher programmed area. Push AREA DOWN to dec- rement to the next lower area. G
Ericsson TMX - 8810, INDICATORS Display Indicators A Liquid Crystal Display (LCD) provides the operational status of the radio. The display contains TX and BSY indicators and eight alphanumeric characters (see Figure 8). TX (Transmit) ON: Indicates the microphone Push-to-Talk (PTT) is pushed. FLASHING: Indicates attempting to acquire a channel in trunked mode. BSY (Busy) Trunked Mode: FLASHING: Indicates radio is automatically retrying to acquire a channel while system is busy. (Radio must be pre programmed for call retry option. ON: Indicates out-of-range of the GE-MARC system. Conventional
Ericsson TMX - 8810, 2. Momentarily press the microphone push-to-talk (PTT) switch to acquire a channel. The display will show WAIT momentarily. A 3 tone alert signal will then signal when you can being the conversation. If the "off-hook call originate" option is prepro- grammed, the radio will automatically attempt to ac- quire a channel when the microphone is removed from the hanger without pressing the PTT. A steady one second low frequency tone will sound if the call cannot be completed due to all available channels busy. Press the PTT again later to retry the call. A sequence of five beeps will sound if the radio cannot
Ericsson TMX - 8810, TRANSMITTER ADJUSTMENT The adjustment for the transmitter includes measuring the forward and reflected power, and setting the transmitter to rated power output. Then, measure the frequency and modulation and record these measurements for future reference. For the complete transmitter adjustment, refer to the Alignment Procedure. RECEIVER ADJUSTMENT No adjustment for the input circuit is required. For complete receiver adjustment, refer to the Receiver Alignment Procedure. SERVICE OPTIONS To facilitate troubleshooting of problems on the
Ericsson TMX - 8810, Removing Chip Components 1. Using two soldering irons heat both ends of the chip at the same time until solder flows, and then remove and discard the chip. 2. Remove excess solder with a vacuum solder extractor. 3. Carefully remove the epoxy adhesive and excess flux to prevent damage to the printed board. Replacing Chip Components 1. Using as little solder as possible, "tin" one end of the component and one of the pads on the printed wiring board. 2. Place the "tinned" end of the component on the "tinned" pad on the board and simultaneously touch the component and the pad with a well "tinned" sol- dering
Ericsson TMX - 8810, PARTS LIST C O M B O SYMBOL PART NO. DESCRIPTION 19A705109G1 HARDWARE KIT - - - - - MISCELLANEOUS - - - - - - 1 19A705406P408 Machine bolt, hexagon: M4-0.7. 2 19A702362P908 Machine screw. 3 19A702364P408 Machine screw: TORX Drive, M3.5 - 0.6 x 8. 4 19A701863P18 Clip loop. 5 19A705421P1 Foam Pad. 9 19D902233G8 Control Board. A7 19B801459P2 LCD Assembly. - - - - - - - - - - - MODULE - - - - - - - - - - B901 19A705165P1 Loudspeaker, permanent magnet. - - - - - - - - - CABLES - - - - - - - - W4 and W5 19A705234P1 Cable assembly
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