CHEVROLET RADIO - Corvair
CHEVROLET RADIOSERVICE and SHOP MANUAL1961 RADIOS988414-PUSH BUTTON RADIO988413-MANUAL RADIO988468-CORVAIR PUSH BUTTON RADIO988460-CORVAIR MANUAL RADIO985003-CORVETTE RADIO985036-MANUAL TRUCK RADIO988336-SERIES 95 MANUAL TRUCK RADIO988389-GUIDE-MATIC HEADLAMP CONTROLPrice 1.00RS 42
when service is required. Using an external typespeaker affords the advantage of having a largertype speaker in a limited space area. Thespeaker is coupled to , the instrument panel by aspecial type gasket, thereby using the entireinstrument panel for unusually good tone reproduction.CHEVROLET CUSTOMCORV AIR RADIO988336This radio is a 4 tube with transistor superheterodyne automobile receiver designed expressly for the Series 95 truck installation. Theradio consists of a radio receiver unit withELECTRICAL DESCRIPTION-The circuit used in this receiver is the superheterodyne type that uses no regeneration. Thetuning circuits are of the permeability type andare tuned by varying the iron cores in and out ofthe antenna, radio frequency and oscillator coilslike pistons. The intermediate frequency stagesare tuned by means of two iron cores in eachtransformer and are adjusted with an insulatedscrew driver from the bottom ,and top of eachtransformer; both the first (input) and second(output) intermediate frequence transformers aretuned by this method. See Figure 87.1IL----The antenna circuit is capacity coupled to theantenna by eans of an adjustable antenna trimmer condenser to take care of normal variationsin antenna and antenna coil capacity. The antennacondenser is adjustable by means of a smallscrew driver and is located at the lower front onthe right side of the radio case.Figure 86The automatic volume control is of the delayedsignal type and is very capable of maintaining aconstant level of volume at all times. Very highfrequency filter chokes are used in the radiofrequency grid circuit to discriminate againstignition interference in the receiver, thus eliminating the use of spark plug and distributorsuppressors.an external spe'aker. This type of design isadvantageous for both installation and serviceas all component parts . of the receiver arereadily accessible for quick efficient replacement,TUBE AND TRANSISTOR COMPLEMENTAND FUNCTION12DZ612AD612EK612DS7DS503Radio frequency amplifierOscillator - modulatorIntermediate frequency amplifierDetector - Automatic volume controland first audioAudio output "HI-POWER" transistorGENERAL INFORMATIONTuning range 5'40 - 1615 kilocyclesIntermediate frequency - 262 kilocyclesMaximum power output 4.2 wattsUndistorted power output 2.6 watts' .Current drain 1. 6 amperes at 12 voltsSpeaker -Alnico V permanent magnet type 6 x 9inchVoice coil impedance 4 ohms at 400 cyclesAll circuits use a printed circuit boardFigure 8787
II .OV.II.OV.II.OV.-2 .IV-.6VII.OV.OV.Figure 88VOLTAGE CHART - 988336 -RADIOPROCEDURE FOR CHECKING THEVOLTAGES OF 988336 RADIOvolt position to read "D. C." voltage. Ground onelead of volt meter to radio chassis and withother lead check all tube pins marked "H" witha voltage reading of 12 volts as shown in Figure88. If incorrect or no voltage, check or replacethe following:Hook up radio on the service bench to a "12"volt power supply unit. It is important that youhave 12 volts at the spark plate of the radio, orthe voltage readings will be correspondinglylower. All voltage readings have been taken withV. T.V.M. Set the volt-ohm meter in the "30"Figure 891. Check or replace "On and Off" switch, Item57C on circuit diagram and 57 on partslayout.PARTS LAYOUT ON CIRCUIT BOARD - 988336 - RADIO88
oCIRCUIT BOARD(TUBE VIEW)TUNER78Figure 90PARTS LAYOUT - BOTTOM VIEW - 988336 - RADIO2. Check or replace condensers, Items 27 and28 on circuit diagram and parts layout.switch and must be opened by speaker plugwhen testing radio.3. Check or replace choke, Item 9 on circuitdiagram and parts layout.5. Check or replace pontentiometer, Item 58 onthe circuit diagram and parts layout.Next check the transistor collector elementmarked" C" of the OS503 output transistor whichshould read 1. 3 to 1. 7 volts O. C. If high or novoltage, check or replace:1. Check or replace emitter fuse resistor, Item49 on the circuit diagram and parts layout.Next check the resistance of the base element ofthe transistor marked "B" of the OS503 toground with the radio turned off. Make thischeck with meter on the R x 1 ohm scale. Theresistance should be between 2 and 15 ohms. Ifincorrect or zero, check or replaee:2. Check or replace speaker, Item 60 on thecircuit diagram and parts layout.1. Check or replace the input transformer, Item55 on the circuit diagram and parts layout.3. Check or replace output transformer, Item 56on the circuit diagram and parts layout.2. Check or replace condenser, Item 30 on thecircuit diagram and parts layout.4. Check connector, Item 61 for ground tochassis. This is a shorting type interlock3. Check or replace resistor, Item 48 on thecircuit diagram and parts layout.89
2. Check or replace resistor, Item 47 on circuitdiagram and parts layout.Next check the resistance to ground of thetransistor emitter element marked "E" with theradio turned off. 8et the ohmmeter on the RX1scale. The resistance should be between 1 and 4ohms. If incorrect or zero, check or replace:Next check tube pin No. 5 marked "P" on the12AD6 which should read 10.8 volts D.C. If incorrect or no voltage, check or replace:1. Check or replace fuse resistor, Item 49 onthe circuit diagram and parts layout.1. Check or replac e 1. F. transfor mer, Item 6on the circuit diagram and parts layout.2. Check or replace condenser, Item 30 on thecircuit diagram and parts layout.Next check tube pin No. 6 marked" 8" on the12AD6 which should read 10.8 volts D.C. If incorrect or no voltage, check or replace:Next, with the radio turned off, check the resistance between the collector element marked" C" and the emitter element marked "E" of theD8503. If less than 1 ohm, the transistor maybe shorted. Disconnect the leads and check theresistance again. If still less than 1 ohm, replace the transistor.1. Check or replace oscillator coil, Item 5 onthe circuit diagram and parts layout.Next check tube pin No. 5 marked "P" on the12DZ6 R.F. amplifier which should read 10.8volts D.C. If incorrect or no voltage, check orreplace:Next check tube pin No. 6 marked "P" on the12D87 which should read 8.7 volts D.C. If incorrect or no voltage, check or replace :1. Check or replace choke, Item 3 on the circuitdiagram and parts layout.1. Check or replace transformer, Item 55 onthe circuit diagram and parts layout.2. Check or replace condenser, Item 20A on thecircuit diagram and parts layout.2. Check or replace resistor, Item 47 on thecircuit diagram and parts layout.Next check tube pin No. 6 marked "S" on the12DZ6 which should read 10.8 volts D.C. If incorrect or no voltage, check or replace:Next check tube pin No. 3 marked "GA" on the12D87 which should read 11.3 volts D.C. If incorrect or no voltage, check or replace:1. Check or replace resistor, Item 47 on thecircuit diagram and parts layout.1. Check or replace choke, Item 9 on circuitdiagram and parts layout.PROCEDURE FOR SIGNAL TRACINGRADIO 988336Next check tube pin No. 8 marked "K" on the12D87 which should read 1.3 volts D.C. If incorrect or no voltage, check or replace:Turn on signal generator and set in audio position to obtain a 400 cycle audio signal. Groundone lead of signal generator to radio chassis.1. Check or replace resistor, Item 44 on thecircuit diagram and parts layout.NOTE: To protect the signal generator from"D. C. " voltage, place a 0.1 mfd. condenserin ' signal generator lead between the signalgenerator and the end of the test lead. Adjustsignal generator volume about 3/ 4 open toobtain a strong signal.Next check tube pin No'. 5 marked "P" on the12EK6 I. F. amplifier which should read 10.8volts D. C. If incorrect or no voltage, check orreplace:1. Check or replace 1. F. transformer, Item 7on the circuit diagram and parts layout.With signal generator lead, touch tube pin No. 6marked "P" on the 12D87 socket. If no signal,check or replace:Next check tube pin No. 6 marked "8" on the12EK6 which should read 10.8 volts D.C. If incorrect or no voltage, check or replace:1. Check or replace fuse resistor, Item 49 onthe circuit diagram and parts layout.1. Check or replace electrolytic condenser, Item29 on the circuit diagram and parts layout.2. Check speaker interlock socket, Item 61.90
oo291CIRCUIT BOARD(CIRCUIT VIEW)TUNER78Figure 91PARTS LAYOUT - TOP VIEW - 988336 - RADIO3. Check or replace speaker, Item 60 on circuitdiagram and parts layout.1. Check or replace 12DS7 tube or tube socketon circuit diagram and parts layout.4. Check or replace the output transformer,Item 56 on the circuit diagram and partslayout.2. Check or replace resistor, Item 45 on circuitdiagram and parts layout.5. Check or replace input transformer, Item 55on the circuit diagram and parts layout.3. Check or replace choke, Item 8 on the circuitdiagram and parts layout.6. Check or replace DS503 transistor outputstage.4. Check or replace condenser, Item 26 on thecircuit diagram and parts layout.With signal generator lead touch tube pin No. 7marked "Gn on the 12DS7 tube. If no signal,check or replace the following:Next turn volume control all the way open andtouch tube pins No's. 1 and 9 marked "DP" on91
Figure 92CIRCUIT BOARD PATTERN - 988336 - RADIOthe 12DS7 tube. If no signal, check or replacethe following:Next touch tube pin No.7 marked "G" on 12AD6tube. If no signal, check or replace the following:1. Check or replace 12DS7 tube.1. Check or replace 12AD6 tube.2. Check or replace volume control, Item 57Aon diagram and 57 on parts layout.2. Check or replace oscillator coil, Item 5 oncircuit diagram and parts layout.Now change signal generator from audio positionto generate an intermediate frequency signal.Set signal generator to 262 kilocycles, leaving0.1 mfd. condenser in signal generator lead toprotect the signal generator from "D.C." voltage. Keep signal generator grounded to radiochassis.Next change signal generator from intermediatefrequency setting to radio frequency signal.Replace the 0.1 mfd. condenser in the signalgenerator lead with a .000082 mfd. condenser toprotect signal generator from "D.C." voltage.Set signal generator to 1100 kilocycles and tuneradio receiver to 1100 kilocycles (11 on dialscale).Next touch tube pin No.1 marked "G" on 12EK6intermediate frequency amplifier tube. If nosignal, check or replace the following:Next touch tube pin No.5 marked "P" on 12DZ6radio frequency amplifier tube. If no signal,check or replace the following:1. Check or replace 12EK6 tube.1. Check or replace radio frequency coil, Item4 on circuit diagram and parts layout.2. Check or replace intermediate frequencytransformer, Item 6 on circuit diagram andparts layout.2. Check or replace oscillator coil, Item 5 oncircuit diagram and parts layout.3. Check or replace 12EK6 tube socket.Next touch tube pin No.5 marked' "P" on 12AD6tube. If no signal, check or replace the following:3. Check or replace condenseI's, Items 20A,19A, 19B and 20B on circuit diagram andparts layout.1. Check or replace intermediate frequencytransformer, Item 6 on circuit diagram andparts layout.4. Check or replace resistor, Item 37 on circuitdiagram and parts layout.92
SIGNAL GENERATORfaNEAl fWH" . .\IAuDIO r rQuE"KY.SIGNAL GENERATORTONECA C1"('\11 ("' .'Ja,0OUTPUT CONTRO .AUDIO rl:ifOuE'IICYBANDA,BANDOUTPUT CONTRO .SIGNAL GENERATORTONErw:T*HI I ,'J.'AUDIO r'l[OUENGYBC'1OLUMfOUTPUT CONTROLBANDJ7;1;047VOLTAGES MEASURED TERMINAL TO CHASSIS WITHA VTVM- NO SIGNAL AND 12.0 VOLTS AT IL.LUS 27.OSCILLATOR GRID VOL.TAGE TAKENWITH SET TUNED TO IDOOKe.59TOTAL "/I." DRAIN AT 12v I.' AMPS.TOLERAN CE ON VOLTAG ES -t;to.""INDICATES LEAD FROM TUNER COI L ASS ' Y,BEfOftE MEASUR ING TRANSISTOR VOLTAGES ,THE SHORTING TYPE SPEAt ER SOCKETMUST BE OPENED ANO A . OHM SPEAKERCONNECTED, IF TRANSISTOR IS REPLACED,ADJUST BIAS POTENTIOMETER {ILLUS.OIITO OBTAIN PROPER COLLECTOR VOLTAGEWITH 12 VOLTS INPUT TO RADIO .t - ILLUS . 'IS A FUSE RESISTOR FOR THETRANSISTOR. SERI/ICE WITH EXACT REPLACEMENT .e-10 OUTPUT TRANSFORMER WILL APP ARSHORTED IF SHORTING TYPE SPEAt ERSWITCH IS NOT HELD OPEN.POI TSIGNAL STOPS - CHECK OR REPLACE ITEMS LISTEDNo signal at Point 5 - Check or replace item 6.No signal at Point 1 - Check or replace items29C - 48 - 49 - 50 - 55 - 56 - 60 - 61 - DS503.No signal at Point 6 - Check or replace item5 - 12AD6 tube or socket.No signal at Point 2 - Check or replace items9 - 29B - 44- 12DS7 tube.No signal at Point 7 - Check or replace items4 - 5 - 19A - 19B - 20A - 20B.No signal at Point 3 Check or replace items23 - 24 - 25- 26 - 44 ,- 45 - 46 - 57A - 57B - 12DS7tube or socket.No signal at Point 8 - Check or ,replace item3 - 12DZ6 tube or socket.No signal at Point 9 - Check or replace items1 - 2 - 16.No Signal at Point 4 - Check or replace item7 or 12EK6 tube or socket.Figure 93SIGNAL TRACING PROCEDURE - 988336 - RADIO93
Next touch tube pin No.1 marked "G" on 12DZ6radio frequency tube. If no signal, check orreplace the following:installation is made, unless the adjustments havebeen tampered with, or new coils, intermediatefrequency transformers, or tuning cores havebeen installed.1. Check or replace 12DZ6 tube.To properly align the receiver, it will be necessary to have an output meter and signal generator.2. Check or replace 12DZ6 tube socket.NOTE: If anyone of the tunirig coils or coreshave been replaced, see "Capacity and Inductance Alignment Procedure" before proceeding with alignment of the receiver. Ifonly the adjustments have been tampered withor an intermediate frequency transformerhas been replaced, proceed with the alignment as follows:3. Check or replace choke, Item 3 on circuitdiagram and parts layout.Next touch antenna terminal at antenna socket.If no signal, check or replace the following:1. Check or replace antenna coil, Item 1 oncircuit diagram and parts layout.1. First hook up an output mElter to the radioreceiver. Any volt meter which will read" A. C." can be used. Set the voltmeter in the"3" volt "A. C." range position and placevoltmeter leads across speaker voice coilte;rminals. Speaker is Item 60 on circuitdiagram and parts layout.2. Check or replace condenser, Item 16 oncircuit diagram and parts layout.3. Check or replace choke, Item 2 on circuitdiagram and parts layout.This completes the entire checking procedure ofthe receiver, and if the procedure has been followed as outlined, the failure will have beenlocated. After repairing failure, receiver willoperate and should now be aligned for properperformance as follows and which is part of theservice operation when repairing radios.2. .Turn on signal generator and set adjustmentsto obtain a 262 kilocycle signal. Connect onelead of signal generator to radio chassis forground. Attach the other lead from the signalgenerator to the tube pin No.7 marked "G"on 12AD6 tube.PROCEDURE FOR ALIGNMENTOF 988336 RADIO3. Adjust signal generator volume control sothat the volt meter will read at about halfscale.All receivers are properly aligned at the factoryand should require no further adjustments, except adjusting the receiver to the antenna whenNOTE: Radio receiver volume control mustbe turned to the maximum position so thatthe automatic volume control circuit of theradio will not affect the alignment of thereceiver.4. Adjust in sequence cores" A, B, C andD", asshown on circuit diagram and parts layout,for maximum meter reading. Repeat adjustments to get maximum meter reading. Keepthe signal generator volume turned down sothat during adjustments the meter does notread more than half scale. This will resultin a better alignment of the receiver.5. Next change signal generator setting to obtaina radio frequency signal and tune signalgenerator to exactly 1615 kilocycles. Connecta .000082 mfd. condenser to antenna connectorand attach signal generator lead. Tune radioreceiver to the "stop" on the 1600 kilocycleend of the dial. Keep the signal generatorvolume control adjusted so that output meterreads at about half scale.Figure 94 IRON CORE ALIGNMENT - 988336 - RADIO94
120Z612A0612EK612057R. F. AMP.OSC-MOOI.F. AMP.DET-AUD17 0en17;1;047*1VOLTAGES MEASURED TERMINAL TO CHASSIS WITHA VTVM-NO SIGNAL . AND 12.0 VOLTS AT ILLUS.?1OSCILLATOR GRID VOLTAGE TAKENWITH SET TUNED TO 1000KC.TOTAL "A' DRAIN AT 12\ -1.6 AMPS.**. -.t B-TOLERANC.E ON VOLTAGES 10"10INDICATES LEAD FROM TUNER COIL ASS'Y .BEFORE MEASURING TRANSISTOR VOLTAGES,THE SHORTING TYPE SPEAKER SOCKETMUST BE OPENED AND A 4 OHM SPEAKERCONNECTED, IF TRANSISTOR IS REPLACED,ADJUST BIAS POTENTIOMETER ( ILLUS. 58 )TO OBTA IN PROPER COLLECTOR VOLTAGEWITH 12 VOLTS INPUT TO RADIO,ILLUS.49 IS'A Fl)SE RESISTOR FOR THETRANSISTOR. SERVICE WITH EXACT REPLACEMENT.TOTOFUSE BLOCK HEATERSOUTPUT TRANSFORMER WILL APPEARSHORTED IF SHORTING TYPE SPEAKERSWITCH IS NOT HELD .oPEN.Figure 95CIRCUIT DIAGRAM - 988336 - RADIO
Figure 96TUNER AND DIAL CORD VIEW - 988336 - RADIO6. Adjust trimmers "E, F and G" on circuitdiagram and parts layout in sequence formaximum readings on output meter. Repeatfor maximum meter readings.Procedure" operations 1 through 4. After completing the intermediate frequency alignment,proceed as follows:1. Connect signal generator lead to a .000082mfd. condenser and connect to antenna terminal of antenna socket. Tune signal generator to exactly 1615 kilocycles, and tuneradio receiver to "stop" on the 1600 kilocycle end of the dial.7. After the receiver has been installed in thecar, turn on receiver and tune in a weakstation near 1000 kilocycles, with radio volume control turned to maximum positionand the antenna extended to full height. Readjust trimmer "G" ONLY for maximumvolume.2. Adjust output meter to about half scale, andthen adjust trimmers "E, F and G" on circuit diagram and parts layout in sequence formaximum meter readings.CAP ACITY AND INDUCTANCE ALIGNMENTPROCEDURE FOR 988336 RADIO3. Next tune signal generator and radio receiverto exactly 600 kilocycles, 6 on radio dial, andadjust iron cores "H, J and K" for maximumreadings on output meter.This alignment procedure is to be used onlywhen any of the following parts have beenreplaced in the radio; antenna coil, radio frequency coil, oscillator coil or any of the tuningcores.NOTE: The iron cores are slotted so thatadjustments can be made with a small insulated screw driver that fits loosely in thecoil forms.The intermediate frequency alignment at 262kilocycles is the same as outlined in "Alignment96
4. Repeat alignment procedure at 1615 and 600kilocycles until the maximum readings havebeen attained.5. After the receiver has been installed in thecar, turn on the receiver and tune in a weakstation near 1000 kilocycles, with radio volume turned to maximum position and antennaextended to full height. Readjust trimmer"G" only for maximum volume.Illus.No.ServicePart 9DescriptionR.F. tuningOscillator tuning1st I.F.2nd I.F.Choke, hashChoke, "A" supply, inputCONDENSERSFigure 97CROSS SECTION OF ESCUTCHEON 988336 - 272748587270375SERVICE PARTS LIST988336 RADIORESISTORSNOTE: All Chevrolet radio service partsare available to dealers through GeneralMotors Parts Division Warehouses. Ordersfor radio parts requirements to be placedwith warehouse in the usual manner.Illus.No.ServicePart No.353637383940414243Description44ELECTRICAL nna Trimmer.047 mfd., 75 volt, tubularDual TrimmerR. F. SectionOsc. SectionCapacitor, dual ceramic.000068 mfd., 500 volt.000043 mfd. , 500 volt.1 mfd., 75 volt, tubular.000033 mfd., 500 volt,ceramic.0047 mfd., 500 volt, ceramic.001 mfd., 500 volt, ceramic.000027 mfd., 500 volt,ceramic.000680 mfd.Spark Plate.47 mfd., 100 volt, tubularElec
SERVICE and SHOP MANUAL 1961 RADIOS 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 . 89 switch and must be opened by speaker plug when testing radio.
Page 4 Mid Continent Corvair Association Newsletter September 2016 Continued on Page 5 The Corvair racers line up with their drivers on the starting grid of the Nebraska road racing track. By Jens Mohr The last weekend in August is the time for the Corvair Track Classic in Hastings Nebraska.
Apr 08, 2016 · Jacksonville - 2 Nimnicht Chevrolet – 1 Coggin Chevrolet - 1 Tampa – 32 Ferman Chevrolet – 7 Gordon Chevrolet – 1 Autonaon Clearwater – 1 DimmiY Chevrolet – 7 Maher Chevrolet - 14 SBngray Chevrolet – 1 Ferman Chevrolet Tarpon Springs - 1 Pensacola – 3 Sa
challenger srt 392 6.4l v8 . dodge . challenger srt 392 hemi . dodge . challenger srt 8 . dodge . challenger srt 8 392 . dodge . challenger srt demon . dodge . challenger srt hellcat . apache chevrolet 3100 chevrolet master chevrolet sierra chevrolet s10 chevrolet c10 chevrolet nova chevrolet cheyenne chevrolet malibu .
Jack Cauley Chevrolet, Inc. John H. Cauley Dexter Chevrolet Co. Joseph B. Slatkin Dick Genthe Chevrolet, Inc. Richard E. Genthe Bernie Haul Chevrolet, Inc. ** Bernard C. Houthoofd James-Martin Chevrolet, Inc. James P. Large Jefferson Chevrolet Co. James P. Tellier Raymond R. Tessmer Lou LaRiche Chevrolet-Subaru, Inc. Louis H. LaRiche Walt .File Size: 2MB
2013-2014 Cadillac XTS 2010-2014 Chevrolet Camaro 2011-2014 Chevrolet Camaro Convertible 2009-2012 Chevrolet Colorado 2011-2014 Chevrolet Cruze, Volt (2014 MY: front driven wheel bearings only) 2010-2014 Chevrolet Equinox 2014 Chevrolet Impala (New Body Style) 2013-2014 Chevrolet Malibu
The 1964 Corvair electrical systems are basically the same as outlined in the 1961 Corvair Shop Manual, except for the following changes. BATTERY A 9 plate (per cell) 42 ampere hour battery (fig. 8-1) is now used for standard production models. Maintenance and service procedures are the same ex .
excluded). Last September there was GM’s 100th anniversary. Next Octo-ber, we will be celebrating Corvair’s 50th birthday. However, next month will mark a more somber date. Forty years ago on May 14, 1969 the last Corvair production line at the Willow Run plant shutdown.
The modern approach is fact based and lays emphasis on the factual study of political phenomenon to arrive at scientific and definite conclusions. The modern approaches include sociological approach, economic approach, psychological approach, quantitative approach, simulation approach, system approach, behavioural approach, Marxian approach etc. 2 Wasby, L Stephen (1972), “Political Science .
