Westinghouse-Electric-Corp-H-902P6GP 电路原理图.pdf

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1、VOLUME R-25, MOST-OFTEN-NEEDED 1965 RADIO SERVICING INFORMATION Westinghouse CHASSIS REMOVAL 1. Remove the nut holding the earphone jack. 2. Remove three screws holding the PC board to the cabinet front. 3. Slide the chassis to the rear so that the Volume knob clears the cabinet. The speaker remains

2、 in the cabinet. SPEAKER REMOVAL 1. Follow steps 1 thru 3 above. 2. Remove the speaker grille from the front of the cabinet. The grille is held to the cabinet front by metal tabs. 3- When replacing the speaker, the terminals should be at the bottom of the cabinet. H-902P6GP CHASSIS V-2461-1 For circ

3、uit diagram and other material see page adjacent at right. Speaker 2* round, 8 ohm PM Power Output (undistorted). .140 watt (maximum). .200 watt Power Supply.(1) 9V battery No Signal Current Drain.6.6 ma Bottom View of PC Board, Showing Top Components in Solid Outline. ALIGNMENT SIGNAL GENERATOR Use

4、 a generator providing modulated 455KC and AM broadcast frequencies. Connect a 4 or 5 turn loop of wire across output cable. Place the loop near the ferrite core antenna of the receiver. To increase or decrease the amount of signal coupled to the receiver move the loop closer or further from the ant

5、enna. Keep the output of the generator low enough to just give an indication on the VTVM or output meter to avoid AVC action. Keep the volume control set at maximum. INDICATOR Connect a VTVM or output meter across the voice coil. RECEIVER Set the volume control to maximum. During the last three step

6、s be sure that the hand or any objects on the bench do not come in close contact with the antenna loop or detuning will occur and alignment will be incorrect. ALIGNMENT TOOL Use a fiber aligning tool that snugly fits the hex shaped hole in the cores of the IF transformers to prevent chi pping. Step

7、Loosely coupled modulated signal to: Gen erator Frequency Cl Setting Adjust for maximum i. Loop LI 455KC Minimum T3, T2 and Tl in order. Reduce generator output if necessary for T2 and Tl adjustments. 2, Loop LI 1650KC Minimum Oscillator trimmer D” 3. Loop LI 1400KC 1400KC Ant. trimmer B* 4. Loop LI

8、 600KC 600KC Oscillator coil, L2, if necessary. 5. Repeat steps 2, 3 & 4. 164 收音机爱 好者资料库 RadioFans.CN WHEN RJ IS OMITTED USE 6SK R R20 VOLUME R-25, MOST-OF TEN-NEEDED 1965 RADIO SERVICING INFORMATION WESTINGHOUSE Model H-902P6GP, Chassis V-2461-1, Continued 165 Figure 2B Alternate 2_ Figure 2C - Alternate 3 Bottom Views of PC Board, Showing Circuit Alternates. 收音机爱 好者资料库 RadioFans.CN