Marconi_2023A_2024A_2025_Service_Manual 电路图.pdf

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1、 AM/FM SIGNAL GENERATORS 2023A, 2023B, 2025 Maintenance Manual Document part no. 46892/377 RadioFans.CN 收音机爱 好者资料库 AM/FM SIGNAL GENERATORS 2023, 2023A, 2023B, 2024 narrows the search down to a defined circuit area. Chapter 6 Replaceable parts Contains instrument and board component parts, and a sect

2、ion on miscellaneous mechanical parts. Chapter 7 Servicing diagrams Contains interconnection drawings, board circuits and component layout diagrams. Associated publications Refer to the relevant Operating Manual (part number 46882-225 for 2023 and 2024, part number 46882-373 for 2023A, 2023B and 202

3、5) for an up-to-date list of associated publications. RadioFans.CN 收音机爱 好者资料库 46882-377 iii Contents Precautions.iv Prcautions.vii Vorsichtsmanahmen. x Precauzioni .xiii Precauciones.xvi Chapter 1 TECHNICAL DESCRIPTION .1-1 Chapter 2 MAINTENANCE.2-1 Chapter 3 ADJUSTMENT PROCEDURES .3-1 Adjustments.3

4、-4 Recommended test equipment .3-7 Adjustment procedures.3-8 Adjustment procedures for instruments fitted with Option 3 or 11.3-22 Adjustment procedure tables.3-24 Appendix A Calibration GPIB commands .A-1 Chapter 4 INITIAL REPAIR.4-1 Chapter 5 FAULT DIAGNOSIS .5-1 Chapter 6 REPLACEABLE PARTS .6-1 C

5、hapter 7 SERVICING DIAGRAMS.7-1 Circuit notes.7-2 PRECAUTIONS iv 46882-377 Precautions These terms have specific meanings in this manual: WARNING Information to prevent personal injury. Information to prevent damage to the equipment. Important general information. Symbols used on this product The me

6、aning of hazard symbols appearing on the equipment is as follows: Symbol Nature of hazard General hazard Dangerous voltage Toxic hazard Static-sensitive components General conditions of use This product is designed and tested to comply with the requirements of IEC/EN61010-1 Safety requirements for e

7、lectrical equipment for measurement, control and laboratory use, for Class I portable equipment and is for use in a pollution degree 2 environment. The equipment is designed to operate from an installation category I and II supply. Equipment should be protected from the ingress of liquids and precip

8、itation such as rain, snow, etc. When moving the equipment from a cold to a hot environment, it is important to allow the temperature of the equipment to stabilize before it is connected to the supply to avoid condensation forming. The equipment must only be operated within the environmental conditi

9、ons specified in Chapter 1 Performance data in the Operating manual, otherwise the protection provided by the equipment may be impaired. This product is not approved for use in hazardous atmospheres or medical applications. If the equipment is to be used in a safety-related application, e.g. avionic

10、s or military applications, the suitability of the product must be assessed and approved for use by a competent person. WARNING Electrical hazards (AC supply voltage) This equipment conforms with IEC Safety Class I, meaning that it is provided with a protective grounding lead. To maintain this prote

11、ction the supply lead must always be connected to the source of supply via a socket with a grounded contact. Be aware that the supply filter contains capacitors that may remain charged after the equipment is disconnected from the supply. Although the stored energy is within the approved safety requi

12、rements, a slight shock may be felt if the plug pins are touched immediately after removal. PRECAUTIONS 46882-377 v Fuses Note that the internal supply fuse is in series with the live conductor of the supply lead. If connection is made to a 2-pin unpolarized supply socket, it is possible for the fus

13、e to become transposed to the neutral conductor, in which case, parts of the equipment could remain at supply potential even after the fuse has ruptured. Removal of covers Disconnect the supply before removing the covers so as to avoid the risk of exposing high voltage parts. If any internal adjustm

14、ent or servicing has to be carried out with the supply on, it must only be performed by a skilled person who is aware of the hazard involved. WARNING Electrical hazards (DC supply voltage) This equipment conforms with IEC safety Class III, meaning that for continued safety it must only be connected

15、to supplies and signal sources which conform to Separated Extra-Low Voltage (SELV and SELV-E) voltage and insulation requirements. No hazardous voltages are generated internally. See under Performance data in Chapter 1 of the Operating Manual for the maximum permitted voltage levels that can be appl

16、ied. WARNING Fire hazard Make sure that only fuses of the correct rating and type are used for replacement. If an integrally fused plug is used on the supply lead, ensure that the fuse rating is commensurate with the current requirements of this equipment. See under Performance data in Chapter 1 in

17、the Operating manual for power requirements. WARNING RF hazard Do not disconnect RF cables which are carrying high levels of RF power. High voltages, which can cause RF burns, may be present at the end of the unterminated cables due to standing waves. Switch off the transmitter or other source of RF

18、 power before disconnecting the cable from the equipment. WARNING Toxic hazards Some of the components used in this equipment may include resins and other materials which give off toxic fumes if incinerated. Take appropriate precautions, therefore, in the disposal of these items. WARNING Beryllia Be

19、ryllia (beryllium oxide) is used in the construction of the following components in this equipment : TR808 on AA1 and AA1/1; TR1 and TR2 on AA2/1 and AA2/7. PRECAUTIONS vi 46882/377 This material, when in the form of fine dust or vapor and inhaled into the lungs, can cause a respiratory disease. In

20、its solid form, as used here, it can be handled quite safely although it is prudent to avoid handling conditions which promote dust formation by surface abrasion. Because of this hazard, you are advised to be very careful in removing and disposing of these components. Do not put them in the general

21、industrial or domestic waste or despatch them by post. They should be separately and securely packed and clearly identified to show the nature of the hazard and then disposed of in a safe manner by an authorized toxic waste contractor. WARNING Beryllium copper Some mechanical components within this

22、instrument are manufactured from beryllium copper. This is an alloy with a beryllium content of approximately 5%. It represents no risk in normal use. The material should not be machined, welded or subjected to any process where heat is involved. It must be disposed of as “special waste”. It must NO

23、T be disposed of by incineration. Static-sensitive components The presence of static-sensitive components is indicated in the equipment by yellow disks, flags or labels bearing the symbol . Certain handling precautions should be observed to prevent these components being permanently damaged by stati

24、c charges or fast surges: 1. If a static-sensitive component is to be removed or replaced, the following anti-static equipment should be used: A work bench with a grounded conductive surface. Metallic tools grounded either permanently or by repeated discharges. A low-voltage grounded soldering iron.

25、 A grounded wrist strap and a conductive grounded seat cover for the operator whose outer clothing should not be of man-made fiber. 2. If a printed board containing static-sensitive components (as indicated by warning disk or flag) is removed, it must be temporarily stored in a conductive plastic ba

26、g. 3. As a general precaution, avoid touching the leads of a static-sensitive component. When handling a new one, leave it in its conducting mount until it is required for use. 4. If using a freezer aerosol in fault finding, take care not to spray programmable ICs as this may affect their contents.

27、Suitability for use This equipment has been designed and manufactured by IFR Ltd. to generate VHF and UHF signals for the testing of radio communications apparatus. IFR Ltd. has no control over the use of this equipment and cannot be held responsible for events arising from its use other than for it

28、s intended purpose. PRECAUTIONS 46882-377 vii Prcautions Les termes suivants ont, dans ce manuel, des significations particulires: WARNING contient des informations pour viter toute blessure au personnel. contient des informations pour viter les dommages aux quipements. contient dimportantes informa

29、tions dordre gnral. Symboles La signification des symboles lis cet quipement est la suivante: Symbole Nature du risque Risques gnraux Tension dangereuse Danger produits toxiques Conditions gnrales dutilisation Ce produit a t conu et test pour tre conforme aux exigences des normes CEI/EN61010-1 “Rgle

30、s de scurit pour appareils lectriques de mesurage, de rgulation et de laboratoire”, pour des quipements Classe I portables et pour une utilisation dans un environnement de pollution de niveau 2. Cet quipement est conu pour fonctionner partir dune alimentation de catgorie I et II. Cet quipement doit

31、tre protg de lintroduction de liquides ainsi que des prcipitations deau, de neige, etc. Lorsquon transporte cet quipement dun environnement chaud vers un environnement froid, il est important de laisser lquipement se stabiliser en temprature avant de le connecter une alimentation afin dviter toute f

32、ormation de condensation. Lappareil doit tre utilis uniquement dans le cadre des conditions denvironnement spcifies au chapitre 1 Performance data du manuel dutilisation, toute autre utilisation peut endommager les systmes de protection. Ce produit nest pas garanti pour fonctionner dans des atmosphr

33、es dangereuses ou pour un usage mdical. Si lquipement doit tre utilis pour des applications en relation avec la scurit, par exemple des applications militaires ou aronautiques, la compatibilit du produit doit tre tablie et approuve par une personne comptente. WARNING ! Scurit lectrique (tension dali

34、mentation alternative) Cet appareil est protg conformment la norme CEI de scurit Classe 1, cest-dire que sa prise secteur comporte un fil de protection la terre. Pour maintenir cette protection, le cble dalimentation doit toujours tre branch la source dalimentation par lintermdiaire dune prise compo

35、rtant une borne de terre. Notez que les filtres dalimentation contiennent des condensateurs qui peuvent encore tre chargs lorsque lappareil est dbranch. Bien que lnergie contenue soit conforme aux exigences de scurit, il est possible de ressentir un lger choc si lon touche les bornes sitt aprs dbran

36、chement. Fusibles Notez que le fusible dalimentation interne est en srie avec la phase du cble dalimentation. Si la prise dalimentation comporte deux bornes non polarises, il est possible de connecter le fusible au PRECAUTIONS viii 46882/377 neutre. Dans ce cas, certaines parties de lappareil peuven

37、t rester un certain potentiel mme aprs coupure du fusible Retrait des couvercles Lappareil doit tre dbranch avant de retirer les couvercles afin dviter tout contact avec les lments haute tension. Si toutefois un rglage interne ou une rparation ncessitent la prsence de lalimentation, ils devront tre

38、effectus par une personne qualifie et avise des risques encourus. WARNING Scurit lectrique (tension dalimentation continue) Cet quipement est conforme aux normes de scurit CEI Classe III, cest-dire quil ne doit tre connect qu des sources dalimentation ou de signaux qui suivent les recommandations de

39、 tension et disolement du type Tension extra-faible spare (SELV at SELV-E). Aucune tension dangereuse nest gnre en interne. “Performance data” dans le chapitre 1 du manuel dutilisation prcise les niveaux de tension maximum acceptables en entre. WARNING Risque li au feu Lors du remplacement des fusib

40、les vrifiez lexactitude de leur type et de leur valeur. Si le cble dalimentation comporte une prise avec fusible intgr, assurez vous que sa valeur est compatible avec les besoins en courant de lappareil. Pour la consommation, reportez-vous au “Performance data” dans le chapitre 1 du manuel dutilisat

41、ion. Danger RF Ne jamais debrancher un cble RF connect une source de puissance RF en fonctionnement. Il peut y avoir, lextrmit dun cble non charg, des tensions trs importantes susceptibles de causer des brlures graves. Toujours teindre la source de puissance RF avant de dbrancher le cble sur lquipem

42、ent. WARNING Danger produits toxiques Certains composants utiliss dans cet appareil peuvent contenir des rsines et dautres matires qui dgagent des fumes toxiques lors de leur incinration. Les prcautions dusages doivent donc tre prises lorsquon se dbarrasse de ce type de composant. WARNING Le Bryllia Le Bryllia (oxyde de Bryllium) entre