ADJUSTMENT PRECA UTIONS
This modelOs setting are adjusted in two different ways: through the I2C bus control and in the
IMPORTANT SERVICE NOTES
conventional analog manner. The adjustments via the I2C bus control include preset-only
items and variable data.
Maintenance and repair of this receiver should be done by quali-
fied service personnel only.
1. Setting the service mode by the microprocessor.
SERVICE OF HIGH VOLTAGE SYSTEM AND PICTURE1 When the JA373 and JA374 are short-circuited, enter into the service mode.
(Adjustment through the I2C bus control).
TUBE
(Use JWS Key to set as well).
When servicing the high voltage system, remove static charge from it by Connect-
2 Press the CH DOWN / UP key on the remote controller to get ready to select the mode
ing a 10K ohm Resistor in series with an insulated wire (such as a test probe)
between picture tube dag and 2nd anode lead.one by one.
(AC line cord should be disconnected from AC outlet.)3 Press the CH DOWN / UP key on the remote controller to select the modes reversibly
1. Picture tube in this receiver employs integral implosion protection.one by one.
2. Replace with tube of the same type number for continued safety.4 Using the VOLUME UP/ DOWN key on the remote controller, the data can be modified.
3. Do not life picture tube by the neck.5 When the short circuit between the JA373 and JA374 is cut off, it will be released from
4. Handle the picture tube only when wearing shatterproof goggles and after dis-the service mode.
charging the high voltage completely.
2. Factory Presetting.
X-RAY
1 Short JA373 & JA374 and turn on the main power switch.
This receiver is designed so that any X-Ray radiation is kept to an absolute Mini-
Initial values are automatically preset, only when a new EEPROM is used (Judge with
mum. Since certain malfunctions or servicing may produce potentially hazardous
radiation with prolonged exposure at close range, the following precautions shouldthe first 4 bytes).
be observed:2 The initial data are preset as listed in page.
3
1. When repairing the circuit, be sure not to increase the high voltage to more than3 Make sure the data need modify or not (Initial data).
33.0 kV (at beam 0 mA) for the set.
2. To keep the set in a normal operation, be sure to make it function on 29.0 kV ?Note: Once the chassis has been assembly together and ready to be POWER ON for the
1.5 kV (at beam 1600 mA) in the case of the set. The set has been factory-Ad-FIRST TIME, make sure to short JA373 & JA374 to switch to the service mode
justed to the above-mentioned high voltage.position first and then turn on the main power switch. (See 2-1 above).
If there is a possibility that the high voltage fluctuates as a result of the repaies,
never forget to check for such high voltage after the work.
Precaution: If havenOt done this initiation, it may possibly generate excessive Beam
3. Do not substitute a picture tube with unauthorized types and/or brands which
current.
may cause excess X-ray radiation.
BEFORE RETURNING THE RECEIVER
Before 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
hardware is not lodged between the chassis and other metal parts in the
receiver.
2. Inspect all protective devices such as non-metallic control knobs, insulat-
ing fishpapers cabinet backs, adjustment and compartment covers or
shields, isolation resistor-capacity networks, mechanical insulators etc.
29B-FG5 29B-FX5
3-13-2 |
ACEC
