Pilot-Radio-Corp-T-570 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS IN 501 G*3 G*t* Cowcmca P- Twmmc oh G*h T Tihmmcm Coim. Am L*M0ac0K.PMHR SiSS2- Pushbutton Switch SI Shown m BC poBiHON 32 Shown in AC* OC position r i 4 . TRIMMER n 1400 Ac. BC Loop -22k. AbbHCSiSIOOS AM I/2PMTT UNUSS OTHCRWISC SPCtTlfO WOiIT *T * *T

2、tUWUN ACCTPK* (IfPCH liTIMI t ItTIIM S 4* VOLTA WSSrafttf* IFtI mam I A OAftCNICS 4.IVH1S (VtMWI NO.TAS 0 (NWlVALCHt REAR VIEW OF CABINET SHOWING BATTERIES IN PLACE SERVICE NOTES The location and seqnence of the screws for adjusting the ANT., R.F., and I.F. circuits, are illustrated on the diagram.

3、The I.F. amplifier may be aligned with the chassis out of the cabinet but with the loop antenna plugged in. For the I.F. alignment the signal generator must be con nected to the grid of the 1A7GT tube through a .1 mfd. con denser. The R.F. trimmers should also be peaked for maxi mum with the chassis

4、 out of the cabinet. When aligning the ANT. trimmers, the “A” and “B” batteries must be in place, the loop antenna and receiver correctly mounted in the cabinet. The receiver may be aligned on either bat teries or house current. When the receiver is aligned on the broadcast band, connect the signal

5、generator to the ANT. post at the back through a .0002 mfd. condenser, and on the shortwave band use a 400 ohm carbon resistor. When removing the batteries, first unscrew clamps, and then remove battery plugs. Be sure not to pull on the cables, but on the plugs themselves. Place the new “A” and “B”

6、batteries in position shown on diagram and replace clamps in position. The blue and white cable, coming from the chassis, has two 2-prong plugs which are then plugged into the “A” batteries. The red and black cable has two 3-prong plugs, both of which are plugged into the “B” batteries. Pihir Model

7、T-570 RADIO CORPORATION PiMr RADIO CORPORATION MODEL T-521 A.C.-D.C. Rocoiver rear section of pulley ALIGNMENT NOTES See Alignment chart on next page. The following notes ore intended for the use of an expert radio technician: Alignment should be attempted only if the proper meter and signal generat

8、or are at your disposal. Insuloied alignment tools are necessary. Outpulmelers should include A) a low range AC meter, B) a 0-20 volt DC vocuum lube vallmeler. The signal generator must caver the frequencies of 455 kc, 600 kc, 1500 kc, 10.7 me, 90 me and 106 me. During alignment the line voltage fee

9、ding the receiver power*supply should be kept at approximately 117 volts. The receiver should be allowed to warm up for ol least 30 minutes before moking any adjustments. The locations of adjustment screws are indicoled cleorly on the schematic diagram. Alignment adjust ments should be made only in

10、the sequence given in the chort. 1*1 I F 459 Kc Itl IF I0.7mc, Primary 1*1 I.F iO 7mc,Sacandry 2nd IF 455KC ?4lF l0.7mc,Primary ? nd i F |0 7 mc.Stcandary Ratio Detector 10 7me. Primary Rato Of tartar tOTmc.Saeandary ALIGNMENT ADJUSTMENTS 9- AM 3rd I.F 495 KC, Primary 10* AM 3rd i F 459 K c. Secondary i|-BC 0*c Paddar (2* BC 0*c Trimmer 13- Ant BC Trimmnr (on roar eavar 14- F M 0*c Paddar 15- FM 0* Trimmar 16- FM R F. Trimmer FRONT SECTION 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN