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Summary of Contents for Dumont 181
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Page 2: Technical Information
Operating Controls…………………………6 Adjustment Controls……………………….7 Types 181, 182, 183 These receivers have the same operating controls as the type 180 and therefore will not be covered separately DU MONT TYPE 180 GENERAL FEATURES separate reproduction of the sound channel which is associated with the picture. -
Page 3: Caution And Warning
Du Mont A simple straight line layout is used in these receivers that should prove extremely helpful to the serviceman. Viewed from the front, the video receiver is on the left side of the chassis and the sound receiver is on the right. -
Page 6: Installation Of Receiver
Du Mont Antenna Installation In the installation of television receivers the proper antenna is a necessity. Successful installations will result from attention to details, while slipshod and careless work will bring only poor customer satisfaction and repeat calls. There is nothing difficult about the installation of television aerials, a little patience and experience is all that is required. - Page 8 Du Mont Directional Effects In the simple Dipole, directional effects are not very pronounced, but it does have a rather sharp no-signal radius and it is possible in some instances to materially reduce interference by placing the offending source in this area.
- Page 10 Du Mont 4. Astigmatic Positioning Control This is adjusted in conjunction with Control No. 5 to give the best possible focus on the corners of the picture. 5. Horizontal Positioning Control This control positions the picture horizontally. 6. Horizontal Size Control The width of the picture is adjusted by this control.
- Page 11 Du Mont In Fig. 6 the use of a copper oxide rectifier and neon lamp can be explained as follows. The D.C. component necessary for background level, is introduced by the action of the copper oxide (Westector) V24. The neon lamp V23 is provided to protect the rectifier from high voltage surges when the equipment is first turned on.
- Page 12 Du Mont While no fast rule can be laid down, once the section failing has been decided on it will generally be found that a systematic check correctly interpreted will locate the fault. A voltage check of the suspected circuit along with the checking of the tubes employed will probably be the next step.
- Page 13 Du Mont Equipment (Laboratory) In addition to the equipment recommended for the field group the following items are suggested. Du Mont Type 202 Phasmajector Television Signal Generator. Du Mont Type 204A Low Frequency Square Wave Generator. Du Mont Type 204B High Frequency Square Wave Generator.
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Page 19: Resistor Values
Du Mont Ohms 10,000 10 meg 6,000 1 meg 200,000 80,000 100,000 100,000 500,000 15,000 6,000 50,000 25 meg 1.5 meg 1.5 meg 200,000 1 meg 5 meg 5 meg 5 meg 5 meg 2 meg 2 meg 2 meg 300,000 300,000 750,000... - Page 20 Du Mont Mfd. .000075 .0025 .0025 .005 .0005 .0005 .0003 .0002 3-30 mmf. 3-30 mmf. 3-30 mmf. 3-30 mmf. .0006 .0006 .0006 3-30 mmf. .0006 CONDENSER VALUES Volts 1500 1600 1500 1200 1600 1000 1000 4500 1500 1500 4000 4000 4000 4000 1500...
- Page 21 Du Mont TERMINAL VOLTAGES Using Weston Model 772 20,000 Ohms per Voltmeter (with Televerter) Tube Plate 5Z3 filament to ground = 510 volts 5X3 filament to ground = 1600 volts (output after L7 = 1550) 2Y2 output = 3950 to 4200 (ground is positive) (output after R88 = 3800 to 4100 volts) The above measurements were taken with respect to ground, the following are point to point.
- Page 22 Du Mont DOUBLE IMAGE Where two images appear separately on the screen, one of the sweep circuits is adjusted to half its correct speed. If the horizonta1 is at fault the images will appear side by side, conversely if the images are vertically displaced the vertical sweep is at fault FIELD In the RMA Television System there are two fields to each frame.
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