Zenith IQC50H94, Техническое учебное пособие

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15
CONVERGENCE
MEMORY INITIALIZATION PROCEDURE
WARNING: This should only be done in extreme
cases. I2C Data will be reset as well. Be sure
and write down all data values before
continuing.
1. Disconnect Power to Television.
2. Remove the Back Cover.
3. Remove the two screws holding the Main chassis
to the Cabinet if necessary.
4. Disconnect wiring harness clips to free up the
chassis if necessary.
5. Reconnect Power to the Television and turn the
set ON.
6. Locate PP1 and add a jumper between pins 1
and 2 of the PP1 connector.
7. Hold jumper in place for 5 seconds. (A beep will
NOT be heard).
8. Remove the jumper.
9. Confirm EEPROM reset, Input source is now set
to Air and not to Cable 1 or 2. No Child Lock,
and only channels 2 through 13 are in memory.
10.Reassemble Chassis and reinstall PTV back. Set
is now ready to operate.
NOTE: All customers' Auto Programming and
Set-Ups are returned to factory settings.
Pre HEAT
PRESET EACH ADJUSTMENT VR TO CONDI-
TION AS SHOWN:
A) Before Pre Heat Run.
1. Red and Green Drive VR on the CRT PWB. (Not
on Blue CRT).
a
'5,9( 95
Pre set between the 12 o’clock and 2 o’clock
position.
2. SCREEN VR ON FOCUS PACK.
6&5((1 95
Pre Set fully counter clockwise.
3. Focus VR on focus pack
)2&86 95
Pre Set fully clockwise.
CUT OFF
ADJUSTMENT PREPARATION:
A) Pre Heat Run should be finished.
ADJUSTMENT PROCEDURE:
1. Go to I
2
C ADJ Mode. Press and hold the
“Source” key on the front panel and then POWER
ON to access I
2
C adjustment mode.
2. Choose SERVICE item [2] of I2C ADJ. Mode.
(Select CURSOR RIGHT (right arrow key) .
3. Screen VR should be turned clockwise gradually
and set so that retrace lines begin to appear.
4. Return to “normal” mode by using the “left ar-
row” key.
5. Adjust focus VR’s so that focus is even all around
the screen.
PRE-FOCUS ADJUSTMENT
Adjustment preparation
1. The set can face in any direction: west, east,
north or south.
2. Receive the cross-hatch pattern signal.
CONTRAST : 60-70%
BRIGHTNESS : 50%
3. The electrical focus adjustment should have been
completed.
4. The centering DY inclination should have been
adjusted.