Admiral-Y2253 电路原理图.pdf

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1、VOLUME R-22, MOST-OFTEN-NEEDED 1962 RADIO SERVICING INFORMATION ADMIRAL 2N411 0 CONVERTER Q1 Chassis 7B2C, Models Y2081A, Y2082A, Y2083A Chassis 7B2D, Models Y2252, Y2253, Y2256 2N410 0 2N410 T) 1N295 DETECTOR-AVC Jt, TTPC (N PH) (WTKRHmOlUCIOft3 2 1 CKITTCR VvV- PUP TIPI TRANSISTOR VIE NOTES: COMMO

2、N ETCHED CIRCUIT CROWD UNLESS OTHER* SE SPECIFIED CAPACITOR VALUES IN KiCRO FARADS RESISTOR VALUES IN OHMS 1/4 HATT 10*4 VOllACES TAKEN WITH VTWM USINC FRESH |AETRlES WSlCML.VOLUME CONTROL MINIMUM TOIAl CURRENT ORA N (N SIC* Al)-| -10MA EF-4SSAC COLOR COOE f 001 COLOR COOES . V* Tl 2N406 2N406 DRIVE

3、R Q5 RPH B* . 2N408 t93B27-l 2N649 EARPHONE2 JACK uk me oMf rrcells w mv A. T F0UR172V k CELLS IN T62CI ALIGNMENT PROCEDURE Alignment of a transistor radio is similar to alignment of an ordinary vacuum-tube radio. However, there is somewhat more interaction between the RF and IF circuits, thus requi

4、ring greater care in the setting of the adjustments as well as repetition of some of the steps. Therefore, for best results, follow the alignment procedure exactly as given below. Fresh batteries should be used. d. Use lowest output of signal generator that will Set Volume control at max.mum. produc

5、e adequate indication on lowest scale ol Connect output meter across speaker voice coil For best results connect 25 ohm re sistive load through earphone jack, if used. d. Use lowest output of signal generator that will produce adequate indication on lowest scale of output meter. IMPORTANT Output lev

6、el should be held at 25 mw. or less. The voltage reading at the 25 mw. level is approximately 0.8 volts across the 25 ohm load. Signal Gen. Frequency Receiver Gang Setting Adjustment Description Adjustment and for maximum output. QUNHOOK TAB FROM SLOT w ON FRONT SECTION Opening thp Cabinet for Batte

7、ry Replacement, in Models Using the 7B2D Chassis Connection of Signal Generator Radiated Signal. TLoop of several turns of wire, or place generator lead close to receiver for adequate signal. Same as Step 1”. Tune in gen- Antenna (E) for erator signal Trimmer maximum output. NOTE After completing St

8、ep 4 the tuning range should be 1620 KC to 5 35 KC, +5 KC If this range cannot be obtained, continue with Steps 5, 6 and 7. Gang fully Oscillator (Fy for closed Coil Core maximum output. Repeat Step 2, then repeat Step*. 5 and 2 several times until oscillator covers required range. Repeat Step 4. t

9、If signal generator does not produce sufficient output for usable reading, clip hot lead of generator to RF stator plates terminal of gang, clip ground lead to frame of gang. Adjust (Q (B) and C) for usable output only. Then return to Step 1”. + If difficulty is experienced in obtaining signal outpu

10、t, first rotate IF slugs out several turns, then slowly adjust slugs m until output is obtained. Caution Rotating slugs too far inward will damage ceramic capacitor contained in IF can. Antenna trimmer should first be adjusted for maximum output with generator tuned to 1400 KC. Then try to increase output by rocking gang or generator slightly while readjusting trimmer. 收音机爱 好者资料库 RadioFans.CN