Important Safety Notice
Special components are used in this television set which are important for safety. These parts are identified on the schematic diagram by the symbol 
. It is essential that these critical parts are replaced whit the manufacturer’s specified replacement parts to prevent
TABLE OF CONTENTS |
|
OPERATION GUIDE | 03 |
SERVICE ADJUSTMENTS AND CALIBRATIONS |
|
HOW TO OPERATE THE DAC CONTROLS | 06 |
HOW TO ENTER THE SERVICEMAN MODE | 06 |
HOW TO EXIT THE SERVICEMAN MODE | 06 |
DAC DIRECT TABLE | 07 |
MEMORY - DIRECT ACCESS METHOD | 07 |
EEPROM - MEMORY MAP | 07 |
ELECTRICAL INSPECTION | 07 |
INSPECTION OF THE DEFLECTION CIRCUITS | 07 |
CUT OFF - PRE ADJUSTMENTS | 08 |
CALIBRATION OF VIDEO IF | 08 |
AFT ADJUSTMENTS | 09 |
09 | |
NOISE LEVEL ADJUSTMENTS | 09 |
VIDEO OUT ADJUSTMENTS | 10 |
10 | |
COLOUR SATURATION ADJUSTMENTS | 10 |
SHARPNESS ADJUSTMENTS | 10 |
SHUT DOWN SYSTEM COFIRMATION | 10 |
HORIZONTAL WIDTH AND CENTERING ADJUSTMENTS | 11 |
VERTICAL HEIGHT AND CENTERING ADJUSTMENTS | 11 |
WHITE BALANCE PRE ADJUSTMENTS | 11 |
CRT CUT OFF ADJUSTMENTS | 11 |
FOCUS ADJUSTMENTS | 12 |
FRONT PANEL CHECKING | 12 |
AV IN TERMINALS CHECKING | 12 |
AUTOMATIC AND MANUAL MEMORIZATION | 13 |
TUNE CHECKING | 13 |
AUDIO CHECKING | 13 |
PURITY AND CONVERGENCE ADJUSTMENTS | 14 |
SCHEMATICS DIAGRAMS | 15 |
IC601 BLOCK DIAGRAM / PINS AND FUNCTIONS | 16 |
WAVE FORMS | 17 |
CABINET PARTS LOCATION | 19 |
CABINET REPLACEMENT PARTS LIST | 20 |
ELECTRICAL REPLACEMENT PARTS LIST | 21 |
General Guidelines
An Isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect the Receiver from being damaged by accidental shorting that may occur during servicing.
When servicing, observe the original lead dress, especially in the high voltage circuit. Replace all damaged parts (also parts that show signs of overheating.)
Always Replace Protective Devices, such as fishpaper, isolation resistors and capacitors, and shields after servicing the Receiver. Use only manufacturer’s recommended rating for fuses, circuit breakers, etc.
High potentials are present when this Receiver is operating. Operation of the Receiver without the rear cover introduces danger from electrical shock. Servicing should not be performed by anyone who is not thoroughly familiar with the necessary precautions when servicing
Extreme care should be practiced when Handling the Picture Tube. Rough handling may cause it to implode due to atmospheric pressure (14.7 lbs per sq. in). Do not sick or scratch the glass or subject it to any undue pressure. When handling, use safety goggles and heavy gloves for protection. Discharge the picture tube by shorting the anode to chassis ground (not to the cabinet or to other mounting hardware). When discharging, connect cold ground (i.e. dag ground lead) to the anode with a well insulated wire or use a grounding probe.
Avoid prolonged exposure at close range to unshielded areas of the picture tube to prevent exposure to
The Test Picture Tube used for servicing the chassis at the bench should incorporate safety glass and magnetic shielding. The safety glass provides shieldinf for the tube viewing area against
Before returning a serviced receiver to the owner, the service technician must thoroughly test the unit to ensure that is completely safe to operatore. Do not use a line isolation transformer when testing.
Warning !
It is essential that these critical parts are replaced with the manufacturer’s specified replacement parts to prevent
WARNING !!
Esquema Elétrico do chassi MX5Y | (em anexo) |
HOW TO OPEN THE CABINET
Screw | Screw |
- 2 -
