RCA-Victor-Co-Inc-3RH2 电路原理图.pdf

VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION RCA VICTOR 3RH1 Series, Model 3RH10; 3RH2 Series, Models 3RH21, 3RH22, Chassis RC-1199D; and 3RH3 Series, Models 3RH31, 3RH32, 3RH34, Chassis RC-1204E,-F,-J. (See next page adjacent at right for alignment and other service data) I0 5MA 0 200 MA 12 MW 250 MA 20MW 350 MA 50MW 500 MA (OOMW 600 MA 240MW (MAX) 4.2 V RCA BATT VS 149 TERMINAL VIEW & Instruments ol the 3 RH-1 Series, the 3-RH 2 Series, and the 3-RH-3 Series are small pocket style transistorized radio receivers housed in a two-piece non-breakable Impac case The letter ”G following a model number indicates a gift pack consisting of a carrying case, a battery, an earphone and the transistor radio contained in a gift box. The 3-RH 1 Series and the 3 RH-2 Series instruments are direct tuned by means of a large knob on the front of the case. Case appearance is the only difference between the 3 RH-1 and the 3-RH 2 Series. Instruments ol the 3-RH-3 Series feature gear-driven vernier tuning with the tuning knob at the edge ol the case. The dial pointer is covered by a transparent plastic window. S*-* * Y ) . ! / T“ .S- T0 / ,* . r css- - - - - LV) REDl TO - BLK f SPKR TO EARPHONE JACK View from Wiring Side 124 收音机爱 好者资料库 RadioFans.CN VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION RCA VICTOR 3RH1 Series, Model 3RH10, 3RH2 Series, Models 3RH21, 3RH22, Chassis RC-1199D 3RH3 Series, Models 3RH31, 3RH32, 3RH34, Chassis RC- 1204E,-F,-J, Continued (See page adjacent at left for circuit diagram and other service data) CHASSIS REMOVAL 1. Unsolder the battery spring contacts from the circuit board. DO NOT ATTEMPT TO REMOVE CONTACTS FROM CASE. The battery contacts are heat sealed to the plastic case front. 2. Pull the dial knob off of tuning condenser shaft (3-RH-l, -2 only). 3. Remove the knurled nut holding the earphone jack to the case. out of dial pointer in 3-RH-3.) Chassis may then be slid out of case. 6. If necessary to separate chassis and speaker, unsolder speaker leads from wiring side of board. AVOID UNSOLDERING LEADS AT SPEAKER TERMINALS SINCE EXCESSIVE HEAT WILL DAMAGE VOICE COIL LEADS. When reassembling 3-RH-l, -2 Series reverse the above procedure. When reassembling 3-RH-3 Series, the dial window must first be removed. The above procedure is then followed. Finally the dial pointer is placed on the tuning gang shaft and the dial window reinstalled. CRITICAL LEAD DRESS 1. Dress lead from diode to volume control between speaker magnet and top of battery. 2. Keep leads to earphone jack as short as possible. 3. Dress leads from output transistors to speaker towards the edge of the board (away from speaker pot) so as to provide sufficient room for 0.3 mf capacitor. Chassis LayoutView from Component Side 4. Remov the two screws holding the circuit board to the case. 5. Lift up on battery end of chassis. (This will pull tuning capacitor ALIGNMENT PROCEDURE For all alignment operations, connect the low side of the signal generator to the common negative wiring and keep the generator output as low as possible to avoid AVC action. Connect output meter across voice coil. Clip onto extreme ends of speaker terminals only, to avoid damage to voice coil leads. Connect High Signal Dial Side of Signal Gen. Pointer Generator to Output Setting Antenna gang stator CIA thru 455 kc Gang fully .01 mf capacitor open Adjust for Max. Output T4 (3rd I-F) T3 (2nd I-F) T2 (1st I-F) Repeat Steps 1, 2, and 3 Short wire _placed near antenna for 6 radiated signal Gang fully open 1400 kc (rock gang if necessary) Oscillator trimmer C5 Antenna trimmer C2 600 kc (rock gang) TI osc. coil Repeat Steps 5, 6, and 7. 125 收音机爱 好者资料库 RadioFans.CN