20GT-20
21GT-20
Beam current.
ADJUSTMENT PRECAUTION
mode position, and the microprocessor is in input mode. (Adjustment through the I2C bus control). (Use JWS Key to set as well).the mode one by one.reversibly one by one.modified.(OFF) position, and the microprocessor is in out of the service mode.mode position and turn on the main power switch. Initial values are automati- cally preset, only when a new EEPROM is used (Judge with the first 4 bytes).
for the FIRST TIME, make sure to short JA 122 & JA 124 to switch to the service mode position first and then turn on the main power switch (See 2-(1) above).Precaution:If havenOt done this initiation, it may possibly generate excessive
(1).Short JA 122 & JA 124 for 1 second and release to switch to the service(2).Press the CH DOWN / UP key on the remote controller to get ready to select(3).Press the CH DOWN / UP key on the remote controller to select the modes(4).Using the VOLUME UP/ DOWN key on the remote controller, the data can be(5).Short JA 122 & JA 124 for 1 second and release to switch to the normal mode(1).Short JA 122 & JA 124 for 1 second and release to switch to the service(2).The initial data are preset as listed in page 4, 5, & 6. (3).Make sure the data need modify or not (Initial data).
IX3368CEN0 Attachment)
This modelOs setting are adjusted in two different ways: through the I2C bus control and in the conventional analog manner. The adjustments via the I2C bus control include preset-only items and variable data.1.Setting the service mode by the microprocessor.2.Factory Presetting.Note:Once the chassis has been assembly together and ready to be POWER ON3.For reference please check with memory map (UA1 Series type RH-
A) in the case of the set. The setA) in the case of the set. The set
A) for the set.A) for the set.mm
mm
1.5kV (at beam 1100 1.5kV (at beam 1100
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IMPORTANT SERVICE NOTESto more than 28.7kV (at beam 0 to more than 29.0kV (at beam 0 on 24.5kV has been factory - Adjusted to the above-mentioned high voltage.on 25.2kV has been factory - Adjusted to the above-mentioned high voltage.
charging the high voltage completely.21GT-20 :When repairing the circuit, be sure not to increase the high voltage21GT-20 :To keep the set in a normal operation , be sure to make it functionIf there is a possibility that the high voltage fluctuates as a result of the re- pairs, never forget to check for such high voltage after the work.may cause excess X-ray radiation.ware is not lodged between the chassis and other metal parts in the receiver.fishpapers, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacity networks, mechanical insulators etc.
Maintenance and repair of this receiver should be done by quali- fied service personnel only.SERVICE OF HIGH VOLTAGE SYSTEM AND PICTURE TUBEWhen servicing the high voltage system, remove static charge from it by Connect-ing a 10K ohm Resistor in series with an insulated wire (such as a test probe)between picture tube dag and 2nd anode lead. (AC line cord should be discon-nected from AC outlet.)1.Picture tube in this receiver employs integral implosion protection.2.Replace with tube of the same type number for continued safety.3.Do not lift picture tube by the neck.4.Handle the picture tube only when wearing shatterproof goggles and after dis-X-RAYThis receiver is designed so that any X-Ray radiation is kept to an absolute Mini- mum. Since certain malfunctions or servicing may produce potentially hazardous radiation with prolonged exposure at close range, the following precautions should be observed: 1.20GT-20 :When repairing the circuit, be sure not to increase the high voltage2.20GT-20 :To keep the set in a normal operation , be sure to make it function\3.Do not substitute a picture tube with unauthorized types and/or brands whichBEFORE RETURNING THE RECEIVERBefore returning the receiver to the user, perform the following safety checks. 1.Inspect all lead dress to make certain that leads are not pinched or that hard-2.Inspect all protective devices such as non-metallic control knobs, insulating
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ACEC
