Service manual

PV152 2-7 PROJO
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 CONDITION AS SHOWN:
A) Before Pre Heat Run.
1. Red and Green Drive VR on the CRT PWB. (Not on Blue
CRT).
1
2
~
2
D
R
I
V
E
V
R
Pre set between the 12 o’clock and 2 o’clock position.
2. SCREEN VR ON FOCUS PACK.
SCREE
N
V
R
Pre Set fully counter clockwise.
3. Focus VR on focus pack
FO
C
U
S
V
R
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 arrow” 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.
Adjustment procedure
1. Loosen the fixing screw on the lens cylinder so that
the lens cylinder can be turned. (Be careful not to
loosen too much. If the screw is loosened too
much, rattling when tightening becomes greater and
the focus may drift). After completing steps (5), (6),
and (7) below, tighten the fixing screws for each lens
with a torque of 12~17 Kgf cm.
2. Apply covers to 2 of R, G, and B lenses, and project a
single color on the screen and adjust in sequence.(The
adjustment order of R, G, and B is only an example.)
3. For each of the R, G, and B lenses, observe the color
aberration generated on the outer circumference of
the cross-hatch bright line at the center section (3
pitches vertically and horizontally from the center.)
4. If the lens adjustment knob is turned clockwise,
viewed from the front, the color aberration changes as
follows.
CONVERGENCE ADJUSTMENT