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PDP-505HD
76
DRIVE ADJ mode
in Factory mode
X-SUS-G.…..."2" Key
Y-SUS-G .….."4" Key
VR700 (VOFS)
Y DRIVE ASSY
VR750 (VH)
Y DRIVE ASSY
VR851 (IC5V)
Y DRIVE ASSY
VOFS (Offset voltage) adjustment
Adjust so that the voltage between TP705 (VOFS) and TP703 (SUS
GND) becomes ± 0.5V" of the voltage indicated at the "voltage
indication label".
The symptom in case of mis-adjustment
If the VOFS adjustment is not performed properly, dots like blinking
luminance points appear. If deviated greatly from the right adjustment
point, Panel will light white.
VH (voltage for Scan IC) adjustment
Adjust so that the voltage between TP751 (VH) and TP753 (PSUS)
becomes "103V ± 0.5V".
PSUS (=GNDH) is a floating GND and the electric potential is different
from that of chassis GND. Be sure not to short-circuit PSUS (=GNDH)
and another GND, because that may damage the unit.
The symptom in case of mis-adjustment
If the VH adjustment is not performed properly, dots like blinking
luminance points appear. If deviated greatly from the right adjustment
point, panel will light white.
IC5V adjustment
Adjust so that the voltage between TP851 (IC5V) and TP854 (PSUS)
becomes "+5.0V ± 0.1V".
PSUS (=GNDH) is a floating GND and the electric potential is different
from that of chassis GND. Be sure not to short-circuit PSUS (=GNDH)
and another GND, because that may damage the unit.
White 100%
signal
VOFS/VH/
VRN/IC5V
Voltage adjustment
Note) Be sure to measure between specified test points.
Sustain Pulse
Waveform
adjustment
White 100%
signal
X-SUS-G, Y-SUS-G adjustment
Set to the indicated value with a key on the remote control unit.
(refer to DRIVE ADJ mode)
X-SUS-B, Y-SUS-B adjustment
1) Set adjustment value to "8", and confirm that green mis-discharging
dots do not appear within 20mm from top & bottom of Screen.
2) When green mis-discharging dots appear, decrease the adjustment
value "1" by "1" until green mis-discharging dots will disappear.
Set the adjustment value when the green disappear.
3) Observe sustain waveform at each Drive Assy, between K3402
(X-PSUS) and K3404 (SUS-GND), and TP3716 (Y-PSUS) and
TP3713 (SUS-GND). Confirm that the waveform is not distorted.
6
7
Procedure
Adjusting Item
Input signal
Adjusting Point
Adjusting Method
DRIVE ADJ mode
in Factory mode
X-SUS-B.…..."1" Key
Y-SUS-B .….."3" Key
The symptom in case of mis-adjustment
Green mis-discharging dots
appear within 20mm from
top & bottom of Screen.
Summary of Contents for PDP-505HD
Page 5: ...PDP 505HD 5 ...
Page 45: ...PDP 505HD 45 ...
Page 46: ...PDP 505HD 46 A B C D 1 2 3 4 1 2 3 4 3 11 OVERALL CONNECTION DIAGRAM 1 2 ADX2643 ...
Page 47: ...PDP 505HD 47 A B C D 5 6 7 8 5 6 7 8 ADX2643 ADX2643 ADX2643 ADX2643 ADX2643 ...
Page 49: ...PDP 505HD 49 A B C D 5 6 7 8 5 6 7 8 ADX2643 ADX2643 ADX2643 ADX2643 ...
Page 51: ...PDP 505HD 51 A B C D 5 6 7 8 5 6 7 8 AUTO ZOOM BLOCK ...