Zenith-Radio-Corp-T305L 电路原理图.pdf

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1、VOLUME R-26, MOST-OFTEN-NEEDED 1966 RADIO SERVICING INFORMATION ZENITH RADIO CORPORATION MOOEL T305C, L & W USING CHASSIS 5M02 * C3 . 100 PF OSC. COIL |C olS _30X FROM 600T0455KC 9ochd$ ouTPur-oIXpor V3 V4 I2AV6 50C5 DET.AMP. ui* RWR. AMP. doo-264) | .005 m w I T3 -Isa*, _i C5 SWITCH V ONRI J r ft I

2、.F. TRANSFORMERS: The I.F. transformers incorporated in this receiver ere of the new permeability tuned type. The advantage of this type is its*extreme stability under various humid ity and temperature conditions. The upper coil is the secondary and the lower the primary. When adjusting these I.F. t

3、ransformers, the tuning wrench 68-26 con be inserted into the top slug, rotated until maximum output is obtained and then dropped down to the lower sluo end the some operation repeated. The tuning wrench is so designed that turning one slug does not affect the adjustment of the other. CIO OSCILLATOR

4、 TRIMME CI8 ANTENNA TRIMMER 12 OSCILLATOR COIL- V5 35W4 RECT. ,*y A C. INTERLOCK- ON UI SECTION LEADS LINE UP ACCORDING TO THE PART NO AS SHOWN - Tl fST I.F. TRANSFORMER - L3 PRIMARY BOTTOM L4 SECONDARY TOP - T2 2ND I.F TRANSFORMER L5 PRIMARY BOTTOM I-L6 SECONDARY TOP (5(4) Q)-Ci) (3 I2BA6 I2BE6 I2A

5、V6 NOTES: AU VOLTAGES MEASURES FROM CHASSIS TO POINTS INOICATEO WITH A VACUUM TUBE VOLTMETER HAVING II MEGOHMS INPUT RESISTANCE. USE ONLY ZENITH NON-INDUCT let ELECTROLYTIC CONDENSERS FOR REPLACEMENT. IF ANY OTHER TYPE OF ELECTROLYTIC IS USES IT WILL BE NECESSARY TO ADO C SHOWN IN BOTTEB LINES. I.F.

6、 TRANSFORMER NUMBERING STARTS WITH *1 TERMINAL AS FIRST TERMINAL CLOCKWISE FROM MARKER COBE TERMINAL AS VIEWED FROM BOTTOM OF CHASSIS. I.F. FREQUENCY 455 KC TUNING RANGE SSS - 1520 KC ALL RESISTORS *29% TOLERANCE, 1/2 WATT, CARBON UNLESS OTHERWISE SPECIFIES. DENOTES CHASSIS -A- V3 # ALTERNATE PARTS

7、WHEN UI IS I2AV6 NOT USED SEE SCHEMATIC _ BELOW _, / SPEAKER LEADS-1 -VOLUME CONTROL VOLUME CONTROL ALIGNMENT PROCEDURE CONNECT INPUT SIG. OPERATION OSCILLATOR TO ANTENNA FREQUENCY DIAL AT TRIMMERS 1 Converter Grid .5 Mfd. 455 Kc. 600 Kc. L3,L4,L5,L TRIMMERS PURPOSE L3,L4,L5,L6 Align I.F. for max. output. One Turn Loop Coupled Loosely to Ityave magnet Set Osc. to Dial Scale. Align Antenna Stage. 153 收音机爱 好者资料库 RadioFans.CN