PV152
3-2
PRO1200 ADJUSTMENTS
ADJUSTMENTS
EHT MODULE
A. Preparation
Warning:
Unit must be disconnected form power source
or AC prior to removing any connector from circuit
board or unit. Failure to do so may result in severe
damage to the projection unit. Section A-C must be
completed for proper adjustment.
Note: G2 adjustment, see INSTALLATION SECTION
1. Remove fuse “F2A”
2. Put the potentiometers P1 and P2 in their minimum
position (turning clockwise!) .
Note:
See Figure B
3. Pull out one CRT-HV cable of the HV splitter.
4. Insert in the free EHT connector the
precision
EHTprobe (ratio 1000/1).
Warning:
read carefully all safety instructions,
mentionned in the user's manual of the precision high
voltage probe.
B. DRIVE ADJUSTMENT
1. Connect the oscilloscope to the gate of switching
transistor Q7)
2. Switch on the projector.
3. Adjust potentiometer P3 for a drive pulse 'time OFF'
width of 10 us.
4. Remove A/C and reinstall fuse to continue.
P1 High Voltage Adj.
P2 Hold Down
C.
HIGH VOLTAGE ADJUSTMENT
1. Re-apply A/C and switch on the projector
2. Adjust potentiometer P1 "High Voltage Adj." until
the EHT voltage reaches 36.5kV.
Note:
See Figure B
3. Turn potentiometer P2 "Hold Down" until the Hold
Down LED lights up. The projector switches at that
moment into the Hold Down mode, picture disapears.
4. Put the potentiometer P1 again in its minimum
position (turning clockwise!!).
5. Turn the power switch in its OFF position (not-
pressed) and switch on the projector again (press the
power switch).
6. Adjust the potentiometer P1 for an EHT voltage of
34.7kV.
Important:
The EHT splitter, on which a potentiometer is
mounted , leaves the factory as a factory pre-adjusted
unit. A readjustment of the mentionned
potentiometer is in no case allowed.
SMPS
PREPARATION
1. Remove A/C and install PCB extension kit.
2. Select the internal generated test pattern or an input
source at standard frequency (refer to owner's and
installation manual).
SMPS
RGB Input & Switch
Sync & Vertical Deflection
Horizontal Deflection
Magentic Focus & H-Shift
Internal
Remote
Control
RGB Analog Auto Sync Input
SMPS 2+G2
EHT
Fig. A
Schematic Reference:
Page: 6-5
Sect: C-2
P1
P2
Fig. B
20
0K
10
0K
10
0K
22
K
R1
R2
R25
220K
R27
10
K
R26
47
K
C16
10K
BC549C
Q8
5V6
Z4
C15
10K
ADJUST FOR
EHT 34.7kV
FACTORY
PREADJUST
EHT
HOLD DOWN
36.5kV
FACTORY
PREADJUSTED
+17
P3
Fig. C
Schematic Reference:
Page: 6-3
Sect: E-5
+17
100K
C6
R11
18
0K
18
K
R61
R62
10
0K
D4
IN4148
IN4148
D3
C9
22M
10
0K
IC2
4093B
6
5
4
D30
BAW62
C7
C8
100P
82P
IC2
4093B
1
3
2
ADJUST FOR
OFF-TIME Q7
10use c.
SMPS
RGB Input & Switch
Sync & Vertical Deflection
Horizontal Deflection
Magentic Focus & H-Shift
Internal
Remote
Control
RGB Analog Auto Sync Input
SMPS 2+G2
EHT
Fig. D
