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Manual was reasonably easy to follow. I am not an engineer or know much about electronics but with the manuals help I was able to figure out the problem, identify the part required for the repair. Replacement part cost around $30. Whilst replacing the part I was telling myself, "this aint gonna work cos it seems far too easy". Took about 15 minutes to do and my plasma TV works a treat. Would never have been able to do this without the service manual.
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It is OK, this manual help me to repair my dynacord
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Good manual. Even it is an old printed manual, it is well scanned and complete, with all drawings, schematics and parts list. Very good return for the cost.
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I'm very satisfied with my purchase. It resolved my problem. Owner-manuals.com is a very very good place.
Thank you!
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Veramente completo, dettagliato e perfetto nella visione. Perfect, thanks!
Sect. IV Page 2
is calibrated to indcate the ratio o the balanced voltages in terms of impedance.
Model 803A those shown in the Short Circuit Impedance Chart below. When each frequency is set, balance the bridge and note the reading. These readings should agree within 1% of the tabulated readings shown in the table. F o r proper short circuit readings the shorting plug, supplied with the instrument, must be adjusted so that the red dot is a t the top. CAUTION THERE IS NO REASON FOR REMOVINGTHE REAR COVER OF THE INSTRUMENT.
Thephase angle of the impedance under test is determined by the angle between E andEe The null, found at the cancellation point of t k s e two voltages, is detected by a probe sliding around a circular slotted section represented on the schematic as a loop. With a pure resistive load the current and voltage in the system will be in phase, but E and E e will be out of phase, and when the p i s - u p probes are balanced the null will occur at the center of the slotted section with a dial indication of zero degrees phase angle. With a reactive load the current and voltage in the system will not be in phase, and the null will be displaced to one side or the other of center in the slotted section. The amount and direction of displacement will depend upon the phase angle and nature of the reactive load.
Experience has shown that many bridges a r e damaged by removing the rear cover, .particularly if the PHASE dial is not set to 45' before removing the cover.
4-3 M A I N T E N A N C E GENERAL
4-2
ACCURACY CHECK
The accuracy of the Model 803A may bechecked by connecting the shorting plug supplied with the instrument to the UNKNOWN terminal and accurately setting the frequency of operation to SHORT CIRCUlT IMPEDANCE CHART F o r Serial
The overall calibration of the instrument is in part maintained by the setting of the various drive set screws. These screws should not be adjusted. If the accuracy check reveals that the instrument is out of calibration, consult your field sales engineer o r write directly to the factory explaining the nature of the problem.
4-4
LUBRICATION
Freq. MC
The FRONT cover should be removed to lubricate the gears and attenuator pistons. DO NOT REMOVE THE REAR COVER. Lubrication once a year should be adequate. A dry graphite or molybdenum disulfide powder is a preferred lubricant for the attenuator pistons. Apply sparingly with a small artist's brush. The gears may be lubricated with a light moly grease, available from Hewlett-Packard under Stock NO. 850-137.
100
I I
200
300
400
500
DO NOT OVER LUBRICATE.
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