Zenith-Radio-Corp-11A20 电路原理图.pdf

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1、VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION HF1178RD Ssmth Radio (Alignment data is on page 189) MODELS HF1185MD CHASSIS 11A20 HF1185RD 8 5 l $ ; ! vloooVfloJ I W ww |S SjgS t _ li * j i. -/P -Htfs gty t|S Hl - * *oS 8 L4At ir stL5|f *- ss (ijiit * j t “te. i,if |5- P |p35S! M 18

2、8 Chassis 11A20 收音机爱 好者资料库 RadioFans.CN VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION ZENITH Alignment Chassis 11A20 and 11A21 (See page 188 for circuit of 11A20, and page 190 for circuit of 11A21) A vacuum tube voltmeter with an isolation resistor of 2,000,000 ohms in series with

3、the hot lead will serve for FM adjustments. This lead should be shielded. An AC output meter connected across the primary or secondary ofthe output transformer will be satisfactory for all AM adjustments. The signal generator output should be kept just high enough to get an indication on the meter.

4、T3 2ND I F. TRANSFORMER- LI2 PLATE COIL BOTTOM 10.7MC- LI3 GRID COIL TOP 455 KC.- T2 1ST A.M. I.F. TRANSFORMER LI0 PRIMARY BOTTOM- LI I SECONDARY TOP- Tl 1ST F.M. I F TRANSFORMER. , L8PRIMARY BOTTOM- L9 SECONDARY TOP - LOOP CONNECTIONS L4 FM. DETECTOR COIL ! 98 MC .yf l.# CBB BC ANTENNA TRIMMER j 14

5、00 KC. y r C8D BC OSCILLATOR TRIMMER / H i6ooi. y L6 FM.OSCILLATOR COIL- 96 MC DIAL LIGHTJ TUNING- BANDSW1TCH- AUX INPUT T4 3RD F.M. I F TRANSFORMER LI4 PRIMARY BOTTOM LI5 SEC0N0ARY TOP -T 5 3RD AM IF TRANSFORMER LI6 PRIMARY BOTTOM L17 SECONDARY TOP U 95 l25i N V 3ACY W V7 1 1455KC IQ7KCJ 5- U50 1 |

6、 95-1250 1 95-H53 W O* N (6T8 -T6 DISCRIMINATOR TRANSFORMER LI8 PRIMARY BOTTOM LI9 SECONDARY TOP DIAL LIGHT RECORD COMPENSATOR SWITCH ON-OFF SWITCH AND LOUDNESS CONTROL BASS TONE CONTROL TREBLE TONE CONTROL BANDSWITCH -PRESENCE CONTROL Tube & Trimmer Location Chassis 11A20 (Chassis 11A21 is practically identical in layout except that 12AU7 replaces 6C4) 189 收音机爱 好者资料库 RadioFans.CN