00180_2 Codan Obsolete CD/data/bulletins/17 17 00180 2
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Service Bulletin DOCUMENT NUMBER: 17-00180 ISSUE NUMBER: 2 ISSUE DATE: March, ‘98 RELATED DOCUMENTS: C/R 25315 17-00175 Transceiver fails to power up normally 1. Scope This Service Bulletin refers to front control transceivers and control heads dispatched since December 1997. This is the second issue of this Service Bulletin in which the range of acceptable regulators has been extended. The tables below identify the range of equipment and serial numbers likely to be affected. Table 1: Range of affected transceiver serial numbers Transceiver type From Serial Number To Serial Number 9360F E1426 E1634 9360-VF A0269 A0270 9390F E0274 E0296 9680 E0300 E0349 9780F B0556 B0632 Table 2: Range of affected control head serial numbers Control head type From Serial Number To Serial Number 9330 D1284 D1312 9366 D1464 D1654 9391 D0155 D0158 9782 A0334 A0395 Any transceiver or control head modified in accordance with Service Bulletin 17-00175 may also be affected. Head Office Codan Pty Ltd ACN 007 590 605 81 Graves Street Newton South Australia 5074 Telephone +61 8 8305 0311 Facsimile +61 8 8305 0411 Email: radcom@codan.com.au Worldwide web: http://www.codan.com.au Codan (UK) Ltd Gostrey House Union Road Farnham, Surrey GU9 7PT United Kingdom Telephone +44 1252 717 272 Facsimile +44 1252 717 337 Telex 858355 Page 1 of 4 Codan Pty Ltd Suite 11A, 2 Hardy Street South Perth Western Australia 6151 Telephone +61 8 9368 5282 Facsimile +61 8 9368 5283 Transceiver fails to power up normally 2. Symptoms Previously observed symptoms include: • transceiver display back lights are on but there are no characters on the display and no functionality • transceiver functions normally but takes significantly longer than usual to power up Symptoms may only occur under certain conditions such as extremes of temperature. 3. Cause The problems are caused by the use of non brand-name, generic voltage regulators. A recent change to the microprocessor reset circuit (refer Service Bulletin 17-00175), has made the use of non brand-name generic regulator types unacceptable. 4. Corrective action If the symptoms exist in equipment identified in Tables 1 and 2, or in equipment that has been modified retrospectively in accordance with Service Bulletin 17-00175, the voltage regulator should be suspected and changed if necessary. 4.1 Procedure q Remove the transceiver/control head from the installation. q If you want to modify a front panel, continue at Procedure: front panel. Otherwise, continue at Procedure: control head. Procedure: front panel q Remove the two screws securing the bottom cover and remove the cover. q Disconnect the cable connecting the front panel to the Microprocessor and Audio PCB. q Remove the four screws securing the front panel to the chassis. q Withdraw the entire front panel from the chassis. q Remove the two screws securing the shield covering the front panel PCB. q Remove the shield. q Continue at Procedure: identifying the regulator. Procedure: control head q Remove the two screws securing the back panel and remove the panel. q Carefully disconnect the control interface cable (P4) and the extension speaker plug (if fitted). Page 2 of 4 17-00180 Issue 2 Transceiver fails to power up normally Procedure: identifying the regulator q Locate IC11. Refer to Figure 1. IC 11 Figure 1: Location of IC11 q Carefully lift IC11 up off the board so that the identifying markings on its flat side may be read. q Check that the regulator has a manufacturer’s marking such as a trademark or a name. q If IC11 does not have a manufacturer’s trademark or name it will need replacing. Continue at Procedure: changing the regulator. Otherwise, continue at Reassembly. Procedure: changing the regulator Parts required • 1 x LM340LAZ-5.0 voltage regulator, Codan part number XB-07805-501 Tools required • Desoldering tool (or desoldering wick) • 60/40 Tin/Lead resin core solder • Soldering iron • Side cutters • Small pliers Note. Since the display module prevents access to Side 1 of the display board, the regulator must be removed and reinstalled from Side 2. This is the uppermost side. It is therefore not necessary to remove the display board from the front panel/control head. ! 17-00180 Issue 1 Warning. During the following steps, take great care not to damage the through hole plating. Page 3 of 4 Transceiver fails to power up normally q Cut each of the three leads of the regulator as close as possible to the body of the regulator. q Using the soldering iron and the pliers, heat each joint and remove the leads from the board. q Using the desoldering tool or the desoldering wick, clear the solder from the three holes. q Form and trim the leads of the replacement regulator. Refer to Figure 2. Regulator ≈ 4 mm Flat side down ≈ 4 mm Figure 2: Formation of regulator leads q Insert the regulator into the three holes. Flat side down. Refer to Figure 1. q Solder the three leads into the display board. Reassembly q Reassembly of the front panel is the reverse of the steps in Procedure: front panel. q Reassembly of the control head is the reverse of the steps in Procedure: control head. q Reinstall the transceiver/control head to the installation. Page 4 of 4 17-00180 Issue 2
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