McIntosh-MC-225-Service-Manual(1) 电路图 维修手册.pdf

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1、MAINTENANCE MANUAL MC225 STEREO POWER AMPLIFIER (Serial Nos. 100C1 & above) RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Table 1. MC225 VOLTAGE AND RESISTANCE CHART (Schematic No. SC126-167A) Tube 12AX7 (VI) 12AU7 (V2 or V3) 12BH7 (V4 or V5) 7591 (V6, V7, V8, or V9) Pin No. 1 2 3 4 5 6 7 8 9 1 2

2、3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 DC Volts 115 0 1 FIL FIL 115 0 1 FIL 295 115 121 FIL FIL 295 100 121 FIL 285 25 39 FIL FIL 285 25 39 FIL FIL 390 390 0.8 -21 FIL 390 Resistance in Ohms, Unit Off 180K 1M 3.3K 0 0 180K 1M 3.3K 0 27K* 180K 18K 0 0 30K* 2.4M 18K 0 22K* 220K 4.7K 0 0 22K*

3、220K 4.7K 0 0 62* 130* 40 180K 0 130* This Resistance measured to positive side of B+ rectifier SR2. Warning: Discharge filter condensers before making measurements. A high resistance VTVM is used for all measurements, voltages and resis- tances are to ground except as noted. RadioFans.CN 收音机爱 好者资料库

4、 Special components used in the MC225 are listed below. These components are designed and built specifically for the MC225. They may be purchased directly from Customer Service, Mclntosh Laboratory Inc. When you order parts be sure to give the SCHEMATIC NO. and DESCRIPTION from Table 2 below, and se

5、rial and model number for your am- plifier. Table 2. MC225 SPECIAL COMPONENTS (Schematic No. SC126-167A) LABORATORY INC. 2 CHAMBERS STREET, BINGHAMTON, N. Y. Made in U.S.A. Phone-Area Code 607 723-5491 2M-AA126-170 COMPONENT NO. C29A, B, C L5 R45 SR1, SR2 SR3 Tl T2 T3 DESCRIPTION Filter Capacitor, 80-35/15 MF 500/450 V Choke, Filter Thermistor Silicon Rectifier, 500PIV, 500 MA Selenium Rectifier, 400 PIV, 75 MA Output Transformer, Type M-220A Output Transformer, Type M-220B Power Transformer, Type M-221