Raytheon-Mfg-Co-T-150-5 电路原理图.pdf

133 收音机爱 好者资料库 RadioFans.CN VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION RAYTHEON MANUFACTURING COMPANY 6RT1 CHASSIS MODELS: T-150-1, T-150-2, T-150-3, T-150-4, & T-150-5 NT I 2NI l2o C2 CK-760 .Y tHXlll-OSC 1 C3 2.6vl -OIMF C5 r-15-! 2NI I2or < R3 Rl < (8K R7 < R8 I000C 27 K RT3 2NI I2or CK760 2NO IF 7.4V 10 CI2 p|6 .05MF R5 < R9 * 5100 RI6 Rl2 RI5 I0K 0K S27K ON-OFF SWITCH R17 changed from 4700 ohm to 3900 ohm, watt, 10%. BATTERY REPLACEMENT The battery should be the first component checked when the radio is presented for service, since the battery voltage decreases with use and age. The battery voltage should be checked at the battery cable connections with the receiver turned on, and after at least five minutes of operation. Batteries have a tendency to reactivate (re charge) when not in use, and a true test of the batteries capabilities can not be determined until sufficient cur rent has been drawn from the battery. If the battery is found to be dead, the receiver should be checked for a short circuit before the replacement battery is instal led. Disconnect battery and measure resistance with an ohmmeter at the battery cable connections. Ohmmeter will indicate approximately 2100 ohms with positive lead to chassis, approximately 170 ohms with negative lead to chassis and approximately 3200 ohms with all transistors out of circuit with either meter lead to chassis. Battery replacement should be performed when the sound output is noticed to be muffled or distorted with a decrease in total output. RESISTOR VALUES ARE IN OHMS, 1/4WATT, 10% TOLERENCE, UNLESS OTHERWISE SHOWN CAPACITOR VALUES ARE IN MICRO MICROFARADS. UNLESS OTHERWISE SHOWN 0C WORKING VOLTAGE IS 25V UNLESS OTHERWISE SHOWN. 0C VOLTAGE READINGS TAKEN WITH vtvm,no signal in input ano bat tery VOLTAGE - BVOC.VOLTAGES WILL VARY WITH TRANSISTOR CHANGES. ALL VOLTAGES ARE NEGATIVE- TYPE 2NI3B 2NI32 EMITTER BASE COLLECTOR TYPE CK760, 2NII2 I-1 EMITTER “ BASE i COLLECTOR OHMMETER READINGS 3 , DSC COIL AUDIO TRANSISTOR SOCKET COLLECTOR *f=| ol BASE EMITTER-la I (BOTTOM VIEW) ro- (BOTTOM VIEW IF TRANSISTOR SOCKET pSJ- COLLECTOR I CM EMITTER I BOTTOM VIEW) When using an ohmmeter to check continuity and re sistance readings, caution must be observed. It is im portant to know the internal battery voltage of the ohm meter as damage could result due to excessive voltage being applied to the circuit by the ohmmeter. 141 收音机爱 好者资料库 RadioFans.CN