General-Electric-Co-P673B 电路原理图.pdf

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1、VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION GENERAL ELECTRIC COMPANY Models P671A, B, P672A, B, P673A, B, P674B SPECIFICATIONS CABINETS: (Plastic) Models P&71A,B - Black and White Models P672A,B - White and Terra Cotta Models P673A,B - Turquoise and White Model P674B - Green ELEC

2、TRICAL RATING: 105-120 Volts A-C (50 to 60 cycles) or DC 1 MA battery 7 1/2 volt Eveready No. 717 or equivalent 1 B Battery 90 Volt Eveready No. 479 or equivalent OPERATING FREQUENCIES: Tuning range . 540-1600 KC I-F. 455 KC CHASSIS REMOVAL: The chassis is easily removed by means of the following pr

3、ocedure: 1. Swing down cabinet front by grasping front at top edge under handle. 2. Remove tuning and volume control knobs by pulling straight off their shafts. 3. Remove the two small Phillips-head screws ffom the top rear edge of the metal chassis mounting bracket. 4. Slide chassis and bracket out

4、 of cabinet. 5. Remove bracket from chassis by unscrewing the 1/4 mounting screw from the bracket. The power supply chassis is removed from the cabinet by removing the four small hex-head mounting screws. The speaker is mounted on the cabinet front and may be removed by taking off the four speaker m

5、ounting clips which secure the speaker to the four bosses on the inside of the cabinet front. IMPORTANT: Use care when replacing defective parts. Apply as little heat to terminals and connections as possible to remove parts, as excessive heat will damage the plated wiring on the chassis boards. When

6、 replacing knobs, do not force them on, as too much pressure may cause circuit board to bend and crack. VOLUME CONTROL REPLACEMENT: The chassis must first be removed from the cabinet as described under CHASSIS REMOVAL,thenreplace volume control as follows: 1. Cut off the three control lugs and the f

7、our on- off lugs. 2. Heat the remaining part of the lugs on the circuit board and pull out with long-nose pliers. 3. Clean all mounting holes of all excess solder. 4. The volume control on-off switch (catalog no. RRC-367) is used as the replacement. This control has a combined mounting bracket which

8、 can be mounted with the control on the circuit board. There are four holes on the board in which the mounting bracket can be inserted and soldered on the dip-soldered side of the circuit board. TO REPLACE A TUBE SOCKET: Cut the socket free by cutting all of the socket terminals at the chassis. One

9、socket (V2) has a center terminal which must be unsoldered. Now, heat the pieces of terminals remaining in the board only enough so they may be pushed out. The new socket can now be inserted into the holes left by the old one and soldered into place. BATTERY INSTALLATION: Insert batteries in place a

10、s shown in the Tube and Battery location illustration. Make sure the battery connections are well seated. ALIGNMENT SET VOLUME CONTROL AT MAXIMUM CONNECT OUTPUT METER OR SCORE ACROSS VOICE COIL INDUCTIVELY COUPLE SiGNAL GENERATOR TO RECEIVER STEP 1.2 SET SIG GEN AT ASS XC. WITH RECEIVER TUNING GANG

11、OPEN STEP 3 - SET SG GEN AT |620 XC. WlTH RECEIVER TUNING GANG OPEN STEP 4 - SET SIG GEN AT iSOO KC COLOR STRIPE 3.3M .047 .33 ON V .2 ON B 7 SI ON R7 PLUS ACTUATED SWITCH S-2 2 POSITION PLUS SLOTS THIS SI0E ClSA 400MFD 600*170 8 123V K- 1.000 M 1,000.000 CAPACITORS MORE THAN lMMF CAPACITORS LESS TH

12、AN |MF RESISTORS ARE 1/2 WATT 54 收音机爱 好者资料库 RadioFans.CN 53 收音机爱 好者资料库 RadioFans.CN A.C. INPUT A.C.-D.C. BATTERY SWITCH SEL. RECT. A.C.-D.C. BATTERY, SWITCH TO Af. ENNA VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION GENERAL ELECTRIC MODELS P67IA.B P672A.B P673A.B P674B (Continued fr

13、om page 53) 200 / ma ) FUSEr* Rl5 BATTERY + BATTERY BATTERY AC. INPUT 75V DC W / TO A Z A / , BATTERY + B t TO CISC TO A BATTERY - TO “B BATTERY t TO B BATTERY- POWER CHASSIS COMPONENT LOCATION A VERSION POWER CHASSS COMPONENT LOCATION B“ VERSION V VERSION MAIN CHASSIS - COMPONENT LOCATION /.IU AA /on -TO ”x ON POWER SUPPLY BD. SUPPLY BOARD. TO V BATTERY CONNECTION ON POWER SUPPLY BOARD. B VERSION MAIN CHASSIS- COMPONENT LOCATION 1 /POWER BD. V0”xx ON I T3 POWER BO. TO JUNCriCN OF R|4 & RI5 54 收音机爱 好者资料库 RadioFans.CN