Philco-Radio-and-Television-Corp-B1352 电路原理图.pdf

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1、wawwpwH 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1954 MOST-OFTEN-NEEDED RADIO DIAGRAMS Philco Model B1352 (Similar Models are B1349. B1750. B1752. B1753) (Continued from the preceding page, on other side). ALIGNMENT PROCEDURE ALIGNMENT GENERALIn order to perform the alignment pro cedure, it is necessary to

2、 remove the chassis from the cabinet. This can he done by first removing the cabinet bottom and then removing the chassis mounting board. Be careful not to break the Magnecor antenna leads when removing the chassis. CONTROLSSet the volume control to maximum, and the tone control to the treble positi

3、on. Set the wafer switch, W SI, to the broadcast position for the first three steps of the procedure, and to the Special Services position for the last step. Set the tuning control as indicated in the chart. OUTPUT INDICATORConnect the output indi cator (a 1000-ohms-per-volt voltmeter or an oscillo

4、scope) between test point B (located on the antenna terminal board) and ground. (Location of test point B is shown in figure 2.) SIGNAL GENERATORUse an amplitude-modu lated r-f generator. Connect the ground lead to B minus and the output lead as indicated in the chart. OUTPUT LEVELDuring the alignme

5、nt, attenuate the signal-generator output to maintain the output indication below 1 volt. ALIGNMENT CHART SIGNAL GENERATOR RADIO ADJUST CONNECTION TO RADIO DIAL SETTING DIAL SETTING SPECIAL INSTRUCTIONS Connect output lead through a condenser to control grid (pin 6) of 7A8 osc.-mixer tube. 455 kc. (

6、modulated) Gang fully open. Adjust in order given in next column, for maximum output. TC2 and TC4 are located at top of transformers. TC42nd i-f sec. TC32nd i*f pri. TC21st i-f sec. TCI1st i*f pri. See NOTE 1 below. 1620 kc. 1620 kc (see N O T E 2 helow). Adjust for maximum output. C1Boscillator tri

7、mmer Same as step 2. 580 kc. 580 kc. Adjust for maximum output. TC5oscillator tuning core Same as step 2. 1500 kc. 1500 kc. Adjust for maximum output. CIAantenna trimmer (Broadcast) Same as step 2. 3200 kc. 3200 kc. Adjust for maximum output. C2 antenna trimmer (Special Services) OTE 1. If the Magne

8、cor antenna is used, make up a 68 turn, 6-inch.diameter test loop from insulated wire; connect to signal- generator leads, and place near the Magnecor antenna. If an external antenna is used, connect the signal generator to the external antenna lead. NOTE 2. The tuning gang can be set to 1620 kc. by

9、 placing a piece of 6-mil flat shim stock between the heel of the rotor and t e top o t e stator plates, and rotating the rotor until it holds the shim in place. Remove the shim before proceeding with the a lgnment. Be careful not to disturb the setting of the gang when removing the shim. 90 50Y7GT RECTIFIER 7C6 DEI AVC 1ST AUDIO 7AB CONVERTER Base View, Showing Parts Placement 收音机爱 好者资料库 RadioFans.CN