Hallicrafters-Inc-TR-88 电路原理图.pdf

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1、MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION j the hallicrafters tr-88 transistor radio (Continued on the next page) 2 C o a u go * CO * * o o o o J4 7? j: u 2 u .2 -c u o v 2 to boja .a 5 s Q C 3 at o co *5 -*- co *i m o j- o 3 bD e m ctf co 7* c a S1- 3o to u o a, J5_; H g-S fh o * o t- o .

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4、u 0)0)0. J JZ O c -2 6 g) 0) ? Si H O 1 *-* O C2 O 3 o 2 a. jz 5 *- Q ho-S r c3 C 3 P 3 o) 0 L- 0 3 -*-* e i 0) . 3 CO CO Y o |i O (0 c c a 0) *H B fce o 0) 0) 0) Si: S f3 o o 1 CL 0) co ! 收音机爱 好者资料库 RadioFans.CN VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION the hallicrafters CO* (

5、Continued from the preceding page) IF ALIGNMENT SIGNAL GENERATOR CONNECTIONS GENERATOR FREQUENCY RECEIVER DIAL SETTING ADJUST REMARKS Across secondary of stick-loop ant. (ter minal strip on top side of chassis). 455 KC modulated Tuning gang open. A, B & C i-f slugs Tune for maximum output. Same as s

6、tep 1. Same as step 1 Slowly tune over entire range. E & D Neutralizing adj. Adjust so that no os- cillation occur! throughout the tun ing range. I-F oscillation will appear in the output, as heard in the speaker, as distortion that may range from “motor boating” to howl. Some compromise adjustment

7、of the i-f slugs A, B & C, may be required to permit neutralization over the entire tuning range. RF ALIGNMENT Loosly couple to 1620 KC stick-loop antenna. modulated Tuning gang open. g, Osc, trimmer Tune for maximum output. Same as step 3. 535 KC Tuning gang F, Osc. Coil slug Same as step 3. modula

8、ted closed. Same as step 3. 1400 KC modulated 1400 KC H, Ant. trimmer Same as step 3. Hallic rafter Part 112-001 112-002 112-003* 112-004 TRANSISTOR SUBSTITUTION CHART General Transistor G.E. Raytheon Texas Inst. GT 761 2N136 760, 2N112,CK761 GT 760 2N135 CK760, 2N112 CK766 2N139 GT2N109 2N186 - 2N1

9、09 2N109, 352 GT81, 2N109 2N191 2N109 310 * The audio output transistors were installed at the factory as a matched pair. If replacement of either unitbecomes necessary it is recommended that a new matched pair be installed. . . Q Q4 fl ill CD QZ mn 02 TOP VIEW ITV 0 0 BOTTOM VIEW 45 收音机爱 好者资料库 RadioFans.CN