Philco-Radio-and-Television-Corp-J-838 电路原理图.pdf

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1、VOLUME R-21, MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION PHILCO MODELS J-769 J-772 J-773 J-774 J-775 J-838 J-840 J-842 J-845 J-846 Material applicable to these sets is below and on pages 122 and 123. MODELS J-769, J-772, J-773, J-774 and J-775 have similar circuitry with slight variations as

2、shown. MODELS J-838, J-840, J-842, J-845 and J-846 have similar circuitry with slight variations as shown. SPEAKER PHASING, Models J-845, J-846When re placing or connecting the two paralleled speakers, it is possible that an out of phase condition may exist; this is readily apparent by weak output a

3、nd serious distor tion. To correct, interchange the leads to one of the speakers. OOMLE EYELET MODELS J-774 J-75 E *-The push button on top of the cabinet is the Forty Winks - jiT alarm control. This feature enables the user to silence the buzzer for 10 minutes. After 10 minutes the buzzer will Dial

4、 Cord InstallationModel J 774 (Rear View) come on again. The 10 minute cycle may be repeated indefinitely. ss - * J BET S4 I_J?_1, L_“_l rv fT. , AECT n usu foiifsFt m par -CM rcw_ s_ U_*J Jlr o.7v % 4-V* SfiJtSjoOV CO ttQ 7 70 MM Ct /SCS. m I tej71 W i vc * M CO J V I |-1 r cr Ira IP Ci If MOT 07 o

5、sc. COIL WINDING Schematic Diagram Model J-845 jj e_iJ iSOAO lEMO IIOV# ALIGNMENT CHART FILAMENT CMCLHT-B CIRCUIT DIFFERENCES FOR MODEL VARIATIONS SIGNAL GENERATOR RADIO CONNECTION TO RADIO DIAL SETTING DIAL SETTING SPECIAL INSTRUCTIONS ADJUST Ground lead to B; output lead through a .1 mf con denser

6、 to grid (pin 7) of 12BE6 or top of r-f tuning condenser. 455 kc. Tuning gang fully open. Adjust tuning cores, in order given, for maximum output. Z2top Z2bottom Zlbottom Zltop Radiating loop (See Note below). 1620 kc. 1620 Itc Adjust for maximum output. Cl-Bosc. Same as step 2. 1500 kc. 1500 kc Adj

7、ust for maximum output Cl-Aaerial Make up a 6-8 turn, 6 inch diameter loop from insulated wire, connect to signal-generator leads, and place near radio loop. 121 收音机爱 好者资料库 RadioFans.CN bol tion Description VOLUME R”21a MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION PHILCO Models J-769, J-772, J

8、-773, J-774, J-775, J-838, J-840, etc. Continued Bottom View of Permcr Circuit Panel Component Layout Model 1-838 MODEL J-773 In model J-773 the silence time for the forty winks is 7 minutes. After 7 minutes the buzzer goes on again. This 7 minute cycle may be repeated 5 times. A-C INTERLOCK Bottom

9、View. Partial Printed Panel Showing Model J-775 Foil Difference in Hect Fil Circuit and Connections to T2 Bottom View, Partial Printed Panel Showing Model J-769 Foil Difference in B-Circuit PARTS COMMON TO ALL MODELS Service Part No Sym Loca bol tion Description Service Part No Sym- Loca- Cl cz E3 C

10、4 Capacitor, variable, tuning Capacitor, 7.5 mmf, lemp comp. 30-1224-83 R4 R5 Q6 HE Resistor, volume control, .5 megohms Resistor, 1st audio grid, 10 megohms EE-6108340 C3 HS Capacitor, .047 mf, AVC 30 4650-45 R6 K5 Resistor, 1st audio plate, 470,000 ohms 66 4478340 C4 06 Capacitor, 220 mmf, diode f

11、iller 30-1262-23 R7 L5 Resistor, audio output grid 470,000 C5 C6 16 KS Capacitor, 01 mf, 1st audio grid Capacilor, .01 mf, output grid 30-1262 30-1262 R8 R5 ohms . . Resistor audio output bias, 150 ohms 66-4478340 EE-1158340 C7 Q4 Capacitor, 220 mmf output grid 30-1262-23 R9 M3 Resistor, B-f- filter

12、 220 ohms, 1 watt EE-1224340 C8 QZ Capacitor, .01 mf, output plate 30-1262 R10 L4 Resistor, B-f- filtetf 1000 ohms EE-2108340 C9 CIO L3 NS Capacitor, electrolytic (3 section) 20 mf, 25 mf, 30mf, + 150VDC Capacitor, .047 mf line bypass 30 2585-11 30-4650-45 Rll T1 TZ Q5 13 Resistor, isolation, 33,000

13、 ohms Transformer, osc . . Part of Speaker 66-3338340 32-4756-1 32-8384-2 R1 12 Resistor, converter grid, 22,000 ohms 66-3228340 Z1 CZ Transformer 1st I-F 32-4583-23. R2 BE Resistor, I-F bias 68 ohms 66-0688340 ZZ DE Transformer, 2nd I-F 32-4583-23 R3 EE Resistor, AVC filler, 2.2 megohms 66 5228340

14、G1 Contact Panel, antenna 28-12282 122 收音机爱 好者资料库 RadioFans.CN A-C INTERLOCK; Schematic Diagram Model J-772 f 90C5 AUDIO OUTPUT VOLUME R-21, MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION PHILCO Models J-769, J-772 thru J-775, J-838, J-840, J-842, etc. Continued AC INTERLOCK Bottom View of Perma Circuit Panel Component Layout Models J-772. J-772 J-77* Bottom View. Partial Printed Panel Showing Models J-840. J-842 J-84S, f-846. Foil Difference in Feet Filament Circuit 123 收音机爱 好者资料库 RadioFans.CN