TO ENTER SERVICE MODE
- Press MUTE button twice on Remote Control.
- Press MUTE button again to keep pressing.
- While pressing the MUTE button, press MENU button on TV set.
DISPLAYING ADJUSTMENT MENU
- Press MENU button on TV.
KEY FUNCTIONS IN SERVICE MODE
- A single horizontal line ON/OFF: TV (ANT)/VIDEO button (on TV)
- Test signal selection : TV (ANT)/VIDEO button (on Remote)
- Selection of the adjustment items : Channel s/t (on TV or Remote)
- Change of the data value : Volume s/t (on TV or Remote)
- Adjustment menu mode ON/OFF : MENU button (on TV)
- Initialization of the memory (QA02, QA04) : RECALL+Channel (s) button on TV
- Initialization of the self diagnostic data: RECALL+Channel (t) button on TV
“RCUT” selection > 1 button
“GCUT” selection >2 button
“BCUT” selection > 3 button
“CNTX” selection > 4 button
“COLC” selection > 5 button
“TNTC” selection > 6 button
Test audio signal ON/OFF (1kHz) > 8 button
Self diagnostic display ON/OFF > 9 button
TO EXIT SERVICE MODE
Pressing POWER button to turn off
the TV once.
INITIALIZATION OF MEMORY IC DATA
- After replacing QA02 and QA04, the following initialization is required.
- Enter the service mode, then select any register item.
- Press and hold the RECALL button on the Remote, then press the CHANNEL s button on the TV. The initialization of QA02 and QA04 has been completed.
Perform “Programming Channel
Memory” on the owner's manual.
CAUTION: Never attempt to initialize the data unless
QA02, QA04 has been replaced
TEST SIGNAL SELECTION
- Every pressing of TV/VIDEO button on the Remote Control in the Service mode changes the built-in test patterns on screen will be displayed.
- Press “8” button while any built-in test pattern to on the screen to output the 1 kHz sound. Press the button again to cut off the sound.
SELF DIAGNOSTIC FUNCTION
- Press “9” button on Remote Control during display of adjustment menu in the service mode.
- The diagnosis will begin to check if interface among IC’s are executed properly.
Part number of microprocessor
(QA01)
Operation number of protection
circuit (current limiter) . . . . “000” is normal.
BUS line check “OK” Means,
Normal
“SCL-GND” or “NG” Means, SCL-GND short circuit
“SDA-GND” or “NG” Means, SDA-GND short circuit
“SCL-SDA” or “NG” Means, SCL-SDA
short circuit
BUS line ACK (acknowledge) check “OK” Means, Normal.
Display of Location Number (Not
Good) NG (Display example) : “QA02 NG”, “H001 NG”, “Q501 NG” etc.
Note: The indication of failure
place is only one place though failure places are plural. When repair of a
failure place finishes, the next failure place is indicated. (The order of
priority of indication is left side.)
Sync. signal check Green display
Indicates > Normal
Cyan display Indicates > No
check
Red display Indicates > NG
(Not Good)
UV >> TV mode
V1 >> VIDEO 1 mode
V2 >> VIDEO 2 mode