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Ericsson DRC-200 Maintenance Manual

Desktop 450 - 470 mhz
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Maintenance Manual
DRC-200
DESKTOP REPEATER
450 - 470 MHz

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Summary of Contents for Ericsson DRC-200

  • Page 1 Maintenance Manual DRC-200 DESKTOP REPEATER 450 - 470 MHz...

  • Page 2: Revision History

    Ericsson Inc., at any time and without notice. Such changes will be incorporated into new editions of this manual. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose, without the express written permission of Ericsson Inc.

  • Page 3: Table Of Contents

    AE/LZB 119 1882 R1B TABLE OF CONTENTS Page DESCRIPTION ..........INSTALLATION .

  • Page 4: Specifications

    AE/LZB 119 1882 R1B FIGURES Page Figure 1 - Front Panel Details ......... . Figure 2 - Rear Panel Details .
  • Page 5 AE/LZB 119 1882 R1B SPECIFICATIONS - Continued (Subject to change without notice) Receiver - Cont. Audio Output 2 Watts Max. (5 Watts External) Audio Distortion 5% Max. @ 4.0 VRMS Attack Time 50 ms Max. Closing Time 100 ms Max. Unsquelched Hum and Noise 45 dB Min.

  • Page 6: Description

    AE/LZB 119 1882 R1B DESCRIPTION NOTE The DRC-200 is a state-of-the-art Desktop Repeater for In this manual, the words repeater, radio and unit are operation in the Land Mobile UHF (450-470 MHz) fre- used interchangeably. quency band. The repeater operates in the UHF band with a 25 watt (without duplexer connected) RF output.

  • Page 7: Installation

    AE/LZB 119 1882 R1B If used, plug in the External Speaker. This discon- INSTALLATION nects the Unit’s internal speaker. NOTE Install the microphone’s cable in the modular jack It is recommended that the repeater and antenna in- located on the front panel. There will be a click stallations be performed by a technician qualified in when the connector is fully seated.

  • Page 8: Power On/Off Switch

    AE/LZB 119 1882 R1B POWER ON/OFF Switch REMOTE Button Power ON/OFF is a rocker switch. Press in at the top Not used. end to turn the unit ON. Press in at the bottom end of it to turn the radio OFF. REM Indicator The indicator (LED) at the left end of the window (la- Not used.

  • Page 9: Multiple Cg/Dcg Decode

    AE/LZB 119 1882 R1B Continued erated as No. 18, it then cannot also be re-generated as No. Pin No. Purpose/Specification 23 . Discriminator’s Audio Output; buffered unprocessed (not de-emphasized) audio. One of the 16 different tones or codes can be an input from an external encoder.

  • Page 10: Maintenance

    AE/LZB 119 1882 R1B Although no repeater set-up would likely be configured NOTE to accept all 5 PTTs, it is quite possible that at least two of the five would be utilized. For example, the receiver’s PTT For In-Warranty service information, refer to the action and the front panel’s PTT would probably be used Limited Warranty And Repair Information para- during the repeater’s initial installation and its checkout.

  • Page 11: Channel Guard Tones (Ctcss)

    AE/LZB 119 1882 R1B not be used for more than one user. However, the Time-Out Timer – the unit’s Time-Out (carrier con- same encode code could be used for all 16 users if trol) Timer can either be disabled or set to allow a desired.

  • Page 12: Digital Channel Guard Codes

    AE/LZB 119 1882 R1B Digital Channel Guard Codes 104 codes CDCSS codes are specified by a code number in the PC programmer. The following is the relationship between the PC programming code number and the resulting TIA/EIA CDCSS code and its inverted equivalent. Code Inv.

  • Page 13: Theory Of Operation

    AE/LZB 119 1882 R1B pole crystal filter XF401. The filtered output is amplified THEORY OF OPERATION by Q403 before being applied to U401. Inside U401, the 21.4 MHz signal becomes the input to a second mixer with GENERAL INFORMATION an LO frequency of 20.945 MHz as determined by Y401. The second mixer output at 455 kHz is filtered by a six pole The Repeater circuitry is distributed on five PC boards ceramic filter, CF401, then internally amplified and applied...

  • Page 14: Microprocessor/Display Board

    AE/LZB 119 1882 R1B modulation of the transmit TCXO. For good broadband Receiver audio from the main board is routed to the transmit frequency response, both the TCXO and the VCO CTCSS decoder/audio processor IC U204. This IC per- are modulated. Two analog switches, U504A and U504C, forms the CTCSS decoding and the primary muting of the control whether external CTCSS tones are to be transmitted receiver audio.

  • Page 15: Transmit Receive Switch

    AE/LZB 119 1882 R1B TRANSMIT RECEIVE SWITCH RF POWER LEVELING AND THERMAL SHUTDOWN When the transmit 13.6 Volt line (Pin 3 of J301) be- comes active, current passes through L316, R308, L311, L318 and R310 form an RF pickup loop that samples CR301, L315, CR302 and CR303 to ground.
  • Page 16 AE/LZB 119 1882 R1B Type: Digital Input Description: Unless superseded by a higher priority PTT input, an active level at this input Description: Unless superseded by a higher priority will cause the transmitter to transmit a PTT input (see Table 1), when the REM carrier modulated by the signal on the LED on the front panel is illuminated, an DATA IN input (pin 11).
  • Page 17 AE/LZB 119 1882 R1B Pin Number: 7 Level: An on-channel signal will produce 1.3 volts DC nominal into an open circuit. Name: REMOTE TX AUD Open circuit output level is 200 mv/kHz nominal. Type: Analog Input Frequency Flat within +1/-3 dB, DC to 3 kHz. Description: This pre-emphasized audio input modu- Response: lates the transmit carrier when the REM...

  • Page 18: Ptt Priorities And Tx Audio Details

    AE/LZB 119 1882 R1B series with analog inputs is required to Pin Number: 14 block the 1.8 volts DC present at this pin. Name: INTRCNT. TX AUD Frequency Flat within +1/-3 dB, 5 Hz to 2.4 kHz. Response: Note: The input is DC coupled to allow Type: Analog Input for proper switching of both TTL/CMOS...
  • Page 19 AE/LZB 119 1882 R1B Table 1 - PTT Priorities and TX Audio Details vs. MUX Logic Levels SOURCE PTT INPUT AUDIO INPUT LEVEL LEVEL FREQUENCY MUX (U502) PRIORITY INPUT RMS @ 1kHz ADJUSTMENT RESPONSE Local Mic. Connector Mic. Connector 6 mv None Pre-emphasized;...

  • Page 20: Maintenance

    AE/LZB 119 1882 R1B panel VOLUME control to the mid-range position. MAINTENANCE Connect an audio RMS voltmeter, SINAD meter, and distortion meter, if available, to the speaker ter- RECEIVER minals. For optimum performance, the unit should be realigned For base station units, set the unit to a receive fre- before being put into service.

  • Page 21: Figure 6 - Test Probe A

    AE/LZB 119 1882 R1B VCO Tuning generator output level to keep the signal on the os- cilloscope at 0.1 volt p-p. Adjust C435 for a DC voltage of 2.75 ± 0.05 volts Modulate the RF signal generator with a 1000 Hz at TP402.
  • Page 22 AE/LZB 119 1882 R1B Preset R528 (HI PWR Set) and R526 (LO PWR Deviation Adjustment Set) on the Main PC board fully counter-clock- wise. Preset R544 (MASTER DEVIATION) and R583 (BALANCE) to mid-range. VCO Tuning 10. For base station units, set the unit to a non- Adjust C545 for a DC voltage of 2.45 ±...
  • Page 23 AE/LZB 119 1882 R1B 13. Repeat steps 11 and 12 several times checking de- DTMF/ID Tone Adjustment viation and the demodulated waveform since R544 and R583 interact. 24. Turn the unit OFF. Wait at least 30 seconds. De- press the T button (MON button on the repeater) Internal DCS Adjustment and activate the PTT while turning the unit on.

  • Page 24: Troubleshooting

    AE/LZB 119 1882 R1B 29. Connect the audio generator to pin 14 of P502 on 34. Ground pin 2 of P502. The unit should begin the rear of the unit. The generator should be set for transmitting. a 1 kHz sine wave at the desired output level. 35.

  • Page 25: Figure 7 - Troubleshooting: Receiver Completely Dead

    AE/LZB 119 1882 R1B Figure 7 - Troubleshooting: Receiver Completely Dead (Page 1 of 2)
  • Page 26 AE/LZB 119 1882 R1B Figure 7 - Troubleshooting: Receiver Completely Dead (Page 2 of 2)

  • Page 27: Figure 8 - Troubleshooting: Noise Present But No Signal Received

    AE/LZB 119 1882 R1B Figure 8 - Troubleshooting: Noise Present But No Signal Received (Page 1 of 2)
  • Page 28 AE/LZB 119 1882 R1B Figure 8 - Troubleshooting: Noise Present But No Signal Received (Page 2 of 2)

  • Page 29: Figure 9 - Troubleshooting: No Transmit Power

    AE/LZB 119 1882 R1B Figure 9 - Troubleshooting: No Transmit Power...

  • Page 30: Figure 10 - Troubleshooting: Receive Synthesizer

    AE/LZB 119 1882 R1B Figure 10 - Troubleshooting: Receive Synthesizer...

  • Page 31: Figure 11 - Troubleshooting: Transmit Synthesizer

    AE/LZB 119 1882 R1B Figure 11 - Troubleshooting: Transmit Synthesizer...

  • Page 32: Duplexer Removal And Replacement

    AE/LZB 119 1882 R1B 10. Disconnect the following coax cables: DUPLEXER REMOVAL AND REPLACEMENT P401’s miniature coax from rear panel’s lower BNC connector labeled ANTENNA. The following procedures should be followed to remove and replace the duplexer. PA Module’s RG-58 coax from rear panel’s upper BNC connector labeled TX ANTENNA.

  • Page 33: Duplexer Tuning Procedures

    AE/LZB 119 1882 R1B 25. Connect the antenna’s coax cable to the lower N- NOTE type connector labelled ANTENNA. It may be easier to perform Steps 19 and 20 BE- 26. Plug in AC cord. The unit is now ready for use. FORE the Main Board Assembly is fully low- ered into place.

  • Page 34: Tuning Instructions

    TX port and reconnect the cable to the TX port that was removed in step 4. Turn off the DRC-200 with the front panel POWER ON/OFF switch and unplug AC power 10. Disconnect the cable from the RX port and connect...

  • Page 35: Replacement Parts Lists

    AE/LZB 119 1882 R1B Figure 13 - Duplexer Connections and Tuning Adjustements Parts labeling is per the following nomenclature: REPLACEMENT PARTS LISTS Replacement Parts are arranged in Tables 2 through 7 as Control Board follows. Microprocessor/Display Board PA Board Figure references to the relevant parts placement dia- Main Board 4XX, 5XX grams are also included.
  • Page 36 AE/LZB 119 1882 R1B Table 2 - Replacement Parts, Microprocessor/Display Board ITEM REF. NUMBER DESCRIPTION R261, 273 Resistor, Chip; 15K Ohm, SMD ITEM REF. NUMBER DESCRIPTION R266 Resistor, Chip; 33K Ohm, SMD R267, 276 Resistor, Chip; 470K Ohm, SMD Capacitor, Chip; .22 µF; SMD C201, 203 R268 Resistor, Chip;...
  • Page 37 AE/LZB 119 1882 R1B Table 4 - Replacement Parts, Main Board Table 4 - Replacement Parts, Main Board ITEM REF. NUMBER DESCRIPTION ITEM REF. NUMBER DESCRIPTION L402 Coil, AW; 16 Ga. C402, 407, 467, 490, 491, 549, Capacitor, Chip; 100 pF, 50V; SMD L403 Coil, AW;...
  • Page 38 AE/LZB 119 1882 R1B Table 4 - Replacement Parts, Main Board (Cont’d) Table 5 - Replacement Parts, Control Board ITEM REF. NUMBER DESCRIPTION ITEM REF. NUMBER DESCRIPTION P101 Jack, Right Angle Modular; Microphone R472, 501, 503 Resistor, Chip; 680 Ohm, SMD P102 Connector, Header;...
  • Page 39 AE/LZB 119 1882 R1B Table 6 - Replacement Parts, Power Supply Board ITEM REF. NUMBER DESCRIPTION ITEM REF. NUMBER DESCRIPTION Transformer Diode Bridge; 4A, 800V Potentiometer, 1K; Voltage Adjust C1, 4 Capacitor, CD; 0.1µF, 250V C2, 3 Capacitor, CD; 4700pF, 250V Diode, Zener;...
  • Page 40 AE/LZB 119 1882 R1B Table 7 - Replacement Parts, Miscellaneous SERVICE PARTS The following parts will be available as replacement parts. ITEM REF. NUMBER DESCRIPTION RV/1411-7112-502 FRONT PANEL RV/5115-5343-801 SWITCH Fuse, 4 Amp; 3 AG, 250V RV/2402-5384-204 VOLUME/SQUELCH KNOB RV/1301-3299-602 SPEAKER Jack, 3.5MM Phone;...
  • Page 41 AE/LZB 119 1882 R1B You may use this form to record the Unit’s configuration. Decode Encode Encode Tone (Hz) Tone (Hz) During Courtesy User Memo or Code or Code Hang Time Beep Notes/Comments Receive Frequency: Transmit Frequency: RF Output Power: (High/Low or record Watts) Beep on Button Press:...
  • Page 42 AE/LZB 119 1882 R1B CONTROL BOARD (305-187, Rev. A) (305-684, Rev. A)
  • Page 43 BLOCK DIAGRAM AE/LZB 119 1882 R1B BLOCK DIAGRAM (701-174, Rev. C)
  • Page 44 AE/LZB 119 1882 R1B SCHEMATIC DIAGRAM MAIN (COMPOSITE) BOARD (701-215, Sh. 1, Rev. A) (701-216, Sh. 1, Rev. A)
  • Page 45 SCHEMATIC DIAGRAM AE/LZB 119 1882 R1B MAIN (COMPOSITE) BOARD (701-215, Sh. 2, Rev. A) (701-216, Sh. 2, Rev. A)
  • Page 46 AE/LZB 119 1882 R1B SCHEMATIC DIAGRAM MICROPROCESSO/DISPLAY BOARD (701-130, Rev. M) (701-203, Rev. M)
  • Page 47 SCHEMATIC DIAGRAM AE/LZB 119 1882 R1B PA BOARD (602-752, Rev. A) (602-753, Rev. A)
  • Page 48 AE/LZB 119 1882 R1B SCHEMATIC DIAGRAM POWER SUPPLY BOARD (602-589, Rev. B)
  • Page 49 SERVICE OUTLINE AE/LZB 119 1882 R1B MICROPROCESSOR/DISPLAY BOARD (305-536, Rev. C)
  • Page 50 AE/LZB 119 1882 R1B SERVICE OUTLINE PA BOARD (305-537, Rev. C)
  • Page 51 SERVICE OUTLINE AE/LZB 119 1882 R1B MAIN BOARD (305-703, Rev. A)
  • Page 52 Ericsson Inc. Private Radio Systems Mountain View Road Lynchburg, Virginia AE/LZB 119 1882 R1B 1-800-592-7711 (Outside USA, 804-592-7711) Printed in U.S.A.

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