RCAVICTOR 721TS Service Data Download Page 1 | Manualshive

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Summary of Contents for 721TS

Page 1: ...ewing table model Television Receiver having a 10 picture tube kinescope The receiver is complete in one unit and is operated by the use of seven front panel controls Features of the receiver include...

Page 2: ...s wing screw adjustment Ion Trup Magnet top chassis thumb screw adjustment Deflection Coil top chassis wing nut adjustment J HIGH VOLTAGE WARNING OPERATION OF THIS RECEIVER OUTSIDE THE CABINET OR WITH...

Page 3: ...ed to the grid of the control tube and is sufficient to keep the control tube cut off except when the sync pulse is high on the slope of the grid waveform as shown in Figure 2 A If the oscillator chan...

Page 4: ...INSTALLATION OF KINESCOPE The kinescope second anode contact is a recessed metal well in the side of the bulb The tube must be installed so that this contact is approximately on lop The final orientat...

Page 5: ...ver failed to hold sync with the hold control at the extreme counterclockwise position or failed to hold sync at least 60 degrees of clockwise rotation of the control from the pull in point it will be...

Page 6: ...th the antenna ele ment between the reflector and the transmitting antenna When operated on channels seven through thirteen 174 to 216 Mc both types of antennas have side lobes On these channels the m...

Page 7: ...3 Check waveform on grid of V109 4 Check linearity coil L113 for short circuit 5 Check capacitors C139 and C140 for defects TRAPEZOIDAL OR NON SYMMETRICAL RASTER This condi lion can be caused by Defec...

Page 8: ...ing the kinescope should be inserted only after the chassis is turned on end The kinescope should never be allowed to support its weight by resting in the deflecting yoke A bracket should be used to s...

Page 9: ...will be broadened permitting slight misadjustment to pass unnoticed and possibly causing distortion on weak signals PICTURE IF TRAP ADJUSTMENT Connect the VoltOhmyst to the junction of R106 and R107...

Page 10: ...he required range Channel 6 is next aligned in the same manner Set the receiver to channel 6 Set the sweep oscillator to cover channel 6 Set the marker oscillator to channel 6 picture and sound car ri...

Page 11: ...retouched in order to obtain the desired curve In making these adjustments care should be taken that no two trans formers are tuned to the same frequency as i f oscillation may result On final adjust...

Page 12: ...721TS ALIGNMENT TABLE THE DETAILED ALIGNMENT PROCEDURE BEGINNING ON PAGE 8 SHOULD BE READ BEFORE ALIGNMENT BY USE OF THE TABLES IS ATTEMPTED DISCRIMINATOR AND SOUND IF ALIGNMENT STEP No...

Page 13: ...ALIGNMENT TABLE Continued 72 ITS THE DETAILED ALIGNMENT PROCEDURE BEGINNING ON PAGE 8 SHOULD BE READ BEFORE ALIGNMENT BY USE OF THE TABLES IS ATTEMPTED PICTURE IF AND TRAP ADJUSTMENT STEP No...

Page 14: ...721TS ALIGNMENT TABLE Continued THE DETAILED ALIGNMENT PROCEDURE BEGINNING ON PAGE 8 SHOULD BE READ BEFORE ALIGNMENT BY USE OF THE TABLES IS ATTEMPTED R F AND CONVERTER LINE ALIGNMENT STEP No...

Page 15: ...c ALIGNMENT TABLE Continued R F OSCILLATOR ALIGNMENT 72 ITS STEP No...

Page 16: ...WS T106 POWER TRANSFORMER I Figure 21 Chassis Top View Showing Location of Major Components 3 NOTE IN SOME RECEIVERS LI02 IS USED IN PLACE OF TI04 Figure 22 Chassis Bottom View Showing Location of Maj...

Page 17: ...in 1 of V105 Figure 26 Horizontal 5 0 Volts P to P c Figure 21 Vertical 32 Volts P to P Input to Kinescope Grid unction of L106 and Green head to Kinescope Socket Figure 28 Horizontal 32 Volts P to P...

Page 18: ...te of Horizontal Output Approx 5000 Volts P to P Measured Through a Capacity Divider Connected from Plate to Ground Figure 46 Voltage Across Horizontal Deflection Coils Approx 1100 Volts P to P Pin 4...

Page 19: ...htness the center The front panel control decals are af fected by the control changes Decal 72805 is for control 7 1 784 Decal 73194 is for control 73193 The operating instruction book is also af fect...

Page 20: ...sets employing con trol 71784 Supplementary sheet 49050 1 S has been issued to convert 1 books for use with sets employing control 73193 Sub sequent printings of late production in struction books wi...

Page 21: ...96 was omitted in receivers employ ing an EM tvpe magnet R197 was employed only in receivers with the 247 ohm focus coil Figure 30 R F Unit Wiring Diagram 20 Direction of arrows clockwise rotation All...

Page 22: ...tor values and their lug identification markings In early production receivers Qr EM type of ion trap magnet was employed and was connected as shown by the dotted ines R196 was omitted in receivers em...

Page 23: ...ly production receivers an EM type of ion trap magnet was employed and was connected as shown by the dotted lines R195 was omitted in receivers employ ing an EM type magnet In some receivers the anten...

Page 24: ...justing screw for coils L54 L56 L58 L60 L62 Screw 4 40 x W binder head screw for adjust ing coils L66 L68 L70 L72 L74 L76 Segment Converter grid section rear segment less coils or r f amplifier plate...

Page 25: ...120 000 ohms 1 watt R1S9 Resistor 150 000 ohms Vi watt R155 Resistor 180 000 ohms V2 watt R158 Resistor 270 000 ohms 1 watt R126 14983 30648 30653 72738 72739 30652 71993 31449 30649 72632 70249 31071...

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