Chevrolet 985003 Service And Shop Manual Download | Manualshive

Page: 10 / 13

background image

«
...
8
9
10
11
12
...
»

Summary of Contents for 985003

Page 1: ...ADIOS 988414 PUSH BUTTON RADIO 988413 MANUAL RADIO 988468 CORVAIR PUSH BUTTON RADIO 988460 CORVAIR MANUAL RADIO 985003 CORVETTE RADIO 985036 MANUAL TRUCK RADIO 988336 SERIES 95 MANUAL TRUCK RADIO 988389 GUIDE MATIC HEADLAMP CONTROL Price 1 00 RS 42 ...

Page 2: ... of each transformer both the first input and second output intermediate frequence transformers are tuned by this method See Figure 87 The antenna circuit is capacity coupled to the antenna by eans of an adjustable antenna trim mer condenser to take care of normal variations in antenna and antenna coil capacity The antenna condenser is adjustable by means of a small screw driver and is located at ...

Page 3: ... correspondingly lower All voltage readings have been taken with V T V M Set the volt ohm meter in the 30 volt position to read D C voltage Ground one lead of volt meter to radio chassis and with other lead check all tube pins marked H with a voltage reading of 12 volts as shown in Figure 88 If incorrect or no voltage check or replace the following 1 Check or replace On and Off switch Item 57C on ...

Page 4: ...transformer Item 56 on the circuit diagram and parts layout 4 Check connector Item 61 for ground to chassis This is a shorting type interlock 89 switch and must be opened by speaker plug when testing radio 5 Check or replace pontentiometer Item 58 on the circuit diagram and parts layout Next check the resistance of the base element of the transistor marked B of the OS503 to ground with the radio t...

Page 5: ...the 12EK6 which should read 10 8 volts D C If in correct or no voltage check or replace 1 Check or replace electrolytic condenser Item 29 on the circuit diagram and parts layout 90 2 Check or replace resistor Item 47 on circuit diagram and parts layout Next check tube pin No 5 marked P on the 12AD6 which should read 10 8 volts D C If in correct or no voltage check or replace 1 Check or replace 1 F...

Page 6: ...replace DS503 transistor output stage With signal generator lead touch tube pin No 7 marked Gn on the 12DS7 tube If no signal check or replace the following 91 1 Check or replace 12DS7 tube or tube socket on circuit diagram and parts layout 2 Check or replace resistor Item 45 on circuit diagram and parts layout 3 Check or replace choke Item 8 on the circuit diagram and parts layout 4 Check or repl...

Page 7: ...ing 1 Check or replace intermediate frequency transformer Item 6 on circuit diagram and parts layout 92 Next touch tube pin No 7 marked G on 12AD6 tube If no signal check or replace the following 1 Check or replace 12AD6 tube 2 Check or replace oscillator coil Item 5 on circuit diagram and parts layout Next change signal generator from intermediate frequency setting to radio frequency signal Repla...

Page 8: ...BAND 1OLUMf OUTPUT CONTROL t ILLUS IS A FUSE RESISTOR FOR THE TRANSISTOR SERI ICE WITH EXACT RE PLACEMENT 10 e OUTPUT TRANSFORMER WILL APP AR SHORTED IF SHORTING TYPE SPEAt ER SWITCH IS NOT HELD OPEN POI T SIGNAL STOPS CHECK OR REPLACE ITEMS LISTED No signal at Point 1 Check or replace items 29C 48 49 50 55 56 60 61 DS503 No signal at Point 2 Check or replace items 9 29B 44 12DS7 tube No signal at...

Page 9: ...ceeding with alignment of the receiver If only the adjustments have been tampered with or an intermediate frequency transformer has been replaced proceed with the align ment as follows 1 First hook up an output mElter to the radio receiver Any volt meter which will read A C can be used Set the voltmeter in the 3 volt A C range position and place voltmeter leads across speaker voice coil te rminals...

Page 10: ...R VOLTAGES THE SHORTING TYPE SPEAKER SOCKET MUST BE OPENED AND A 4 OHM SPEAKER CONNECTED IF TRANSISTOR IS REPLACED ADJUST BIAS POTENTIOMETER ILLUS 58 TO OBTAIN PROPER COLLECTOR VOLTAGE WITH 12 VOLTS INPUT TO RADIO t ILLUS 49 IS A Fl SE RESISTOR FOR THE TRANSISTOR SERVICE WITH EXACT RE PLACEMENT B OUTPUT TRANSFORMER WILL APPEAR SHORTED IF SHORTING TYPE SPEAKER SWITCH IS NOT HELD oPEN 12A06 OSC MOO ...

Page 11: ...ng cores The intermediate frequency alignment at 262 kilocycles is the same as outlined in Alignment 96 Procedure operations 1 through 4 After com pleting the intermediate frequency alignment proceed as follows 1 Connect signal generator lead to a 000082 mfd condenser and connect to antenna ter minal of antenna socket Tune signal gen erator to exactly 1615 kilocycles and tune radio receiver to sto...

Page 12: ... 1221257 1221255 1217846 7274342 7275120 7272915 7273697 7277489 7271042 7274858 7271556 7271421 7271876 7274491 1221509 7257906 7273730 7270375 7270375 1214563 1213252 1214553 1213488 7273602 1214564 1213217 1214566 1213488 1215944 1214559 1214561 1214540 1215107 7274329 1211005 Description R F tuning Oscillator tuning 1st I F 2nd I F Choke hash Choke A supply input CONDENSERS Antenna Trimmer 047...

Page 13: ...474 Rheostat 300 ohms T C 59 456985 Lamp dial light 1891 60 7277515 Speaker 6 x 9 P M INSTALLATION PARTS special gasket 61 7274985 Switch speaker inter lock 37 8238 Bracket radio cover 3783236 Bracket radio mtg MECHANICAL PARTS 1911095 Capacitor generator CHASSIS 1947452 Capacitor ignition coil 7259643 Capacitor voltage regulator 63 7275571 Dial Light Assembly 3783239 Cover Assembly radio 7271916 ...

Reviews:

No comments

Related manuals for 985003

Brand: JAROLIFT Pages: 8

Brand: Yamaha Pages: 75

Brand: Sylvania Pages: 8

C-Tech HD 6600 SST

Brand: Clarke-tech Pages: 32

Brand: Samson Pages: 15

Brand: IDTECH Pages: 4

Interflex IF-73

Brand: Allegion Pages: 9

Brand: Spektrum Pages: 72

Brand: Strong Pages: 20

Brand: Sound Storm Pages: 12

Brand: Axxera Pages: 31

Brand: RIP TUNES Pages: 31

Brand: TANDBERG Pages: 114

Brand: Planet Audio Pages: 8

Brand: Alpine Pages: 37

Brand: Pansat Pages: 28

Brand: Sennheiser Pages: 28

Brand: Videotec Pages: 37

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands