Related Manuals for Ericsson EDACS 19D902120G1
Summary of Contents for Ericsson EDACS 19D902120G1
- Page 1 LBI-38163B ERICSSONZM Mobile Communications ® EDACS 900 MHz TRUNKED RECEIVER 19D902120G1 ERICSSONZM Ericsson GE Mobile Communications Inc. Mountain View Road Lynchburg Virginia 24502 Printed in U.S.A Maintenance Manual...
- Page 2 LBI-38163 100 milliwatts by RF Amp U3, filtered by FL4, and applied to DESCRIPTION the 1st mixer. TABLE OF CONTENTS These receivers are double conversion, superheterodyne, The 70 MHZ mixer output is amplified by 1st IF Amplifier SPECIFICATIONS ..........single frequency FM receivers for operation in trunked re- U4.
- Page 3 LBI-38163 Supply Voltage board. Power is supplied from a regulated 10 volts from the system board. A Block Diagram Of the audio board is shown in The receiver is supplied by a regulated 10 volts from the Figure 2. system board. However, the more critical circuits are supplied by voltage regulators U5, U7 and U8 for stability and isolation.
- Page 4 LBI-38163 Audio from the pre-amplifier circuit is coupled through the Squelch Switches and audio hybrid ICs through the arm of the VOL and SQ through audio transformer T601 to provide rated power to the VOLUME control to VOLUME arm (P904-13). The audio at controls on the exciter-receiver door assembly.
- Page 5 LBI-38163 Squelch IC board through P904-9 where it is used to activated such options as the Channel Busy light, Carrier Control Timer, and Squelch hybrid U603 contains the noise amplifier, active Carrier Operated Relay. noise filter, detector, slow and fast squelch circuits, the Re- ceiver Unsquelched Sensor (RUS), and the Carrier Activity MAINTENANCE Sensor (CAS) switch.
- Page 6 ADJUSTMENT PROCEDURE LBI-38163 ADJUSTMENT PROCEDURE Audio Board Audio Board RF INPUT RSSI 19D902093G1 19D902118G1 The receiver has no field adjustments for peaking up per- formance. However, should it become necessary to replace com- -40 dBm 4.5 VDC ponents at the customer location, the following adjustments may -60 dBm 4.5 VDC be required.
- Page 7 LBI-38163 OUTLINE DIAGRAM TOP VIEW BOTTOM VIEW (19D902083, Sh. 2, Rev. 3) (19D902083, Sh. 1, Rev. 3) (19A705498, Sh. 1, Rev. 3) (19A705498, Sh. 2, Rev. 3) APPLY SILICONE GREASE BETWEEN U8 AND BOARD (ITEM 2) PER PROCESS 19A701431 (P6A-EA11). THE FOLLOWING ITEMS ARE MOS DEVICES REQUIRING SPECIAL CARE PER 19A701294, Q3 RECEIVER BOARD...
- Page 8 SCHEMATIC DIAGRAM LBI-38163 (19D902107, Sh. 1, Rev. 4) RECEIVER BOARD 19D902083G1...
- Page 9 LBI-38163 SCHEMATIC DIAGRAM (19D902181, Sh. 1, Rev. 0) (19D902182, Sh. 1&2, Rev. 3) AUDIO BOARD 19D902181G1...
- Page 10 SCHEMATIC DIAGRAM LBI-38163 (19D902183, Sh. 1, Rev. 1) AUDIO BOARD 19D902181G1...
- Page 11 LBI-38163 OUTLINE DIAGRAM (19D902093, Sh. 1, Rev. 0) (19A705508, Sh. 1&2, Rev. 0) AUDIO BOARD 19D902093G1...
- Page 12 SCHEMATIC DIAGRAM LBI-38163 AUDIO BOARD (19D902112, Sh. 1, Rev. 1) 19D902093G1...
- Page 13 LBI-38163 PARTS LIST...
- Page 14 PARTS LIST LBI-38163...
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