RCA-RP1610B-pr-sch 电路图 维修手册.pdf
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1、? ? ? ? Latin America After Sales Indianapolis IN 46290 U.S.A. ? ? ? ? ? ? ? ? ? ? ? ? ?!?#?$?% ? ?#?$? ? ?# ? ? ? ? ? ? ? ? ? ? ? ?! ? ? ?!#$%!? ?&??(?)?# RadioFans.CN 收音机爱 好者资料库 1-4 ? ? ? RadioFans.CN 收音机爱 好者资料库 SAFETY PRECAUTIONS 1. Before returning the instrument to the customer, always make a
2、 safety check of the entire instrument, including, but not limited to, the following items: a. Be sure that no built-in protective devices are defective and/ or have been defeated during servicing. (1) Protective shields are provided on this instrument to protect both the technician and the customer
3、. Correctly replace all missing protective shields, including any removed for servicing convenience. (2) When reassembling the instrument, be sure to put back in place all protective devices, including, but not limited to, nonmetallic control knobs, insulating fishpapers, adjustment and compartment
4、covers/shields, and isolation resistor/capacitor networks. Do not operate this instrument or permit it to be operated without all protective devices correctly installed and functioning. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damage, and
5、may expose themselves and others to possible injury. b. Be sure that there are no cabinet openings through which an adult or child might be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to, (1) excessively wide cabinet ventilation slots, and
6、 (2) improperly fitted and/or incorrectly secured cabinet covers. c. Leakage Cold Check - With the instrument AC plug removed from any AC source, connect an electrical jumper across the two AC plug prongs. Place the instrument AC switch in the on position. Connect one lead of an ohmmeter to the AC p
7、lug prongs tied together and touch the other ohmmeter lead in turn to each push button/customer control, exposed metal screws, metallized overlays and to each cable connector. If the measured resistance is less than 1.0 megohm or greater than 5.2 megohm an abnormality exists that must be corrected b
8、efore the instrument is returned to the customer. Repeat this test with the AC switch in the off position. d. Leakage Current Hot Check On completely assembled instrument, plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage curr
9、ent tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1492 (Section 67). Measure for current from a known earth ground (metal waterpipe, conduit, etc.) to all exposed metal or conductiv
10、e parts of the instrument (antenna connections, handle bracket, metal cabinet, screwheads, metallic overlays, push-buttons, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the in
11、strument power cord plug in the outlet and repeat the test. ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE CUSTOMER OR BEFORE CONNECTING TO ANTENNA OR ACCESSORIES. e. Interconnected Equipment AC
12、 Leakage Test Avoid shock hazards. The instrument, accessory, or cable(s) to which this instrument is connected should have the applicable sections of the leakage resistance cold check and the leakage current hot check performed. Do not connect this instrument to an antenna, cable or accessory that
13、exhibits excessive leakage currents. 2. Read and comply with all caution and safety-related notes on or inside the instrument cabinet, and on the chassis. 3. Design Alteration Warning - Do not alter or add to the mechanical or electrical design of this instrument. Design alterations and additions, i
14、ncluding, but not limited to, circuit modifications and the addition of items such as auxiliary audio output connections, cables and accessories, etc., might alter the safety characteristics of this instrument and create a hazard to the user. Any design alterations or additions will void the manufac
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