PV152
3-4
PRO1200 ADJUSTMENTS
ADJUSTMENTS
2. Connect a voltmeter to the collector of transistor Q13
on the Hor. Defl. board. Adjust potentiometer P2 for
+48V on collector.
Note: If Connector J5 is Short Circuited, disables
Standby
Operation.
HORIZONTAL DEFLECTION
Overvoltage protection
Preparation
1. Unplug Projector and install PCB Extension.
2. Adjust P2 and P2 "MAX HOR. AMPL."
on the SM Power
Supply
to its minimum (turning counter-clockwise).
3. Switch
ON
the projector.
4. With respect to chassis ground, measure the dc volt-
age at the cathode of D19 (use a digital multimeter
capable of measuring the voltage of more than 1000V).
Adjust P2
on the SM Power Supply
for 1950Vdc.
5. Adjust P2 (turning clockwise) until the scan hold
down LED D10 lights up. (Projector is now in hold
down)
Reduce the HOR. AMPL. P2 setting (turning counter-
clockwise)
6. Restart the projector (power switching Off/On)
7. Re-adjust P2 as explained in the adjustment proce-
dure of the SM Power Supply (refer to corresponding
service scheet) See Section 2, B, 3
B. Horizontal linearity
The Linearity adjustments corrects for improper hori-
zontal grid spacing on an image (Select therefore a
grid test pattern).
1. Adjust the core of the linearity coil using a 15 kHz
input source for equal horizontal grid spaces.
2. Adjust P1 using a 18 kHz input source for equal hori-
zontal grid spaces.
Note: If a 18 kHz input source is not available, then
any source close
Fig. H
Schematic Reference:
Page: 6-3
Sect: D-6
C11
22K
R49
10
K
R30
18
0K
R31
47
K
10
0K
P2
Q6
BC547A
3
1
2
MAXIMUM
HORIZONTAL
AMPLITUDE
FACTORY
PREADJUSTED
82
0K
R33
1M
21
R32
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. I
Fig. J
Schematic Reference:
Page: 6-6
Sect: E-6
D19
6K8
N2000.2 N2000.3
BYW96E
C24
C46
100K
N1000.2 N1000.3 N1000.1
D24
D35
SR5
BYW96E
BYW96E
R52
33
M
33
M
R56
C32
100K
P2
50
K
R51
20
0K
C29
100K
100P
ADJUST PICTURE WIDTH
LIMITER FOR 1900V
WITH P2
Fig. K
Schematic Reference:
Page: 6-7
Sect: D-7
R29
R30
33
K
33
K
R7
10
0E
R3
2K
7
P1
50
K
Z4
6V8
C 9
1M
C1
4K7
C59
4K7
R17
220E
4W
Q1
BUZ74A
D
S
G
ADJUST HORIZONTAL
LINIARITY FOR 18KHz
LIN_HIGH
>J1 [2]