Admiral-21W1-21Y1-21Z1-21Z1A-Wallace电路原理图.pdf

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1、Figure 52. Sch Note: This schematic applies only to chassis VOLTAGE DATA (Voltages ghren on schematic) TV voltages taken with function switch on TV position. PICTURE control turned folly clockwise. CHANNEL control set on an unused channel. Other front controls set at approximately half rotation. Ver

2、t. Lin. and Height set at approximately half rotation. TV antenna disconnected from set with terminals shorted. Radio voltages V701 and V702 taken with function switch on Rad position; voltages measured from underside of tube sockets. When measured from top of tube sockets (with tube removed), B plu

3、s voltage at pins 5 and 6 of V701 and V702 will be approximately 275 volts. B plus voltages at V203 and V204, will be slightly higher when set is switched to Rad position. Voltages marked with an asterisk * will vary widely with control setting. Line voltage 117 volts AC. Voltages measured with a va

4、cuum tube voltmeter between tube socket terminals and chassis, unless otherwise indicated. Voltages at VlOl, V102, V306 measured from top of socket with lube removed. CAUTION Pulsed high voltages are present on the cap of V406, and on the filament terminals and cap of the 1B3GT tube. NO ATTEMPT SHOU

5、LD BE MADE TO TAKE MEASURE- MENTS FROM THESE POINTS WITHOUT SUITABLE TEST EQUIPMENT. Picture lube 2nd anode voltage can be measured from the 2nd anode connector and should be taken only with a high voltage instrument such as a kilovoltmeter or other meter with a high voltage probe. 2nd anode voltage

6、 for 21W1. 21Z1 and 21Z1A chassis is approxi- mately 14.5 KV. Proper filament voltage check of the 1B3CT lube may be made by observ- ing filament brilliancy as compared with that obtained with a 1.5 volt dry cell battery. 6BA6 IFKP. TV TUNER 94C37-1 6AU6 SOUND IF (A5 IJOV IIIRIET SIIKH SETTIIC SELEC

7、TS Pill Of COIIS LIOI I 1102 FBI CHl.HEl DESIRE!. misutci urn tat teamen ftoi socin. Sfc 6J6 RF MIXER If a different TV Tuner is used in set, see Service Manual Supplement No. S362C to be print- ed at a later date. i l l I/26SN7GT n 1 s/l I MM *MI6 Jo |i L 5!Et ?!; RadioFans.CN 2. Schematic for 21W1

8、, 21Y1, 21Z1 and 21Z1A Television and Radio Chassis, chassis stamped Run 20 to Run 26. WAVEFORM DATA (Waveforms given on schematic) Waveforms taken with picture control set fully to the right, all other controls set for normal picture (in sync). Waveforms at video and sync stages obtained with trans

9、mitted signal input to receiver. The oscilloscope sweep is adjusted for 30 cycles (which is one-half of the vertical requency), or for 7875 cycles (which is one-half of the horizontal frequency) so that two mlses appear on the screen. The peak-to-peak voltage readings shown are subject to some variations due to response the oscilloscope and parts tolerances. ntmr mi miners ri/rfi rim rtif somr tsociir tfiem fia/ run H9f IS SBffSSr in 17) CHASSIS. SBOSSf PIH U8EHIHC SHOW Jf R/GHI. RadioFans.CN