![background image](http://html.mh-extra.com/html/lg/pdp42v5-series/pdp42v5-series_service-manual_1901892007.webp)
- 7 -
¤Ł
Turn the VR3 of Z PCB and make the “C” wave form Fig.
3 to be 15
!
2µs.
But, in case of not setting up the Test point, produce
same output and adjust wave form connect to other
pattern or parts which has no possibility of short.
5. Adjustment after Assembling
(PDP Module Adjustment)
5-1. Using Tools
(1) Digital oscilloscope : More than 200MHz
(2) DVM(Digital Multimeter): Fluke 87 or similar one
(3) Signal generator: VG-825 or similar one
(4) DC power supply
- DC power supply for Vs (1) : Should be changeable more
than 0-200V/ more than 10A
- DC power supply for Va (1) : Should be changeable more
than 0-100V/ more than 5A
- DC power supply for 5V (1) : Should be changeable more
than 0-10V/ more than 10A
- DC-DC Converter Jig (1) : The Jig which has voltage
equivalent output of PDP42V5#### Module after taking
the Vs, Va, 5V voltage
- Voltage stability of power supply : Within
!
1% for Vs/Va,
within
!
3% for 5V
5-2. Connection diagram of measuring
instrument and setting up the initial
voltage
(1) Connection diagram of measuring instrument
Refer to figure 1. (Connection diagram of measuring
instrument that adjusting the voltage wave form)
(2) Setting up the initial voltage
Initially setting up voltage : Vcc:5V, Va:65V, Vs:190V
But, Initially setting up voltage can be changed by the set
up range according to the Module’s characteristic.
5-3. How to Adjust
(1) Adjusting initial voltage wave form
Check the voltage wave form like the mentioned way on
the 4-3(How to adjust) and readjust the wave form when it
is wrong.
(2) Checking the DC/DC pack voltage
¤
Convert the signal of signal generator to the 100% Full
White signal
¤Ł
Connect the GND terminal of DVM to the GND of Y B/D
and set the Plus terminal to the right up leg of R9 to
check the -Ve voltage(-35
!
1V). And when there is
abnormality in voltage turn the variable resistor(VR7) of
DC/DC Pack(-Ve) on Y B/D to adjust.
¤Ø
Connect the GND terminal of DVM to the R60’s right leg
of the Y B/D and set the Plus terminal to the left leg of
R60 to check the Vscw voltage(115
!
1V) and when there
is abnormality in voltage turn the variable resistor(VR5)
of DC/DC Pack(Vscw) on Y B/D to adjust.
¤Œ
Connect the GND terminal of DVM to the R8’s right leg
of the Y B/D and set the Plus terminal to the left leg of
R8 to check the -Vy voltage(-80
!
1V) and when there is
abnormality in voltage turn the variable resistor(VR6) of
DC/DC Pack(-Vy) on Y B/D to adjust.
¤º
Connect the GND terminal of DVM to the R89’s right leg
of the Y B/D and set the Plus terminal to the left leg of
R89 to check the Vsetup voltage(240
!
1V) and when
there is abnormality in voltage turn the variable
resistor(VR4) of DC/DC Pack(Vsetup) on Y B/D to adjust.
(3) Measuring the Vs voltage Margin and deciding
the voltage
¤
Convert the signal of signal generator to the 100% Full
Red signal.
¤Ł
Turn the voltage adjusting knob of Vs DC power supply
to the voltage -down direction and make the cell of
screen turned off.
¤Ø
Turn the voltage adjusting knob of Vs DC power supply to
the voltage -up direction until the cell of screen turned on.
The first voltage, which make the cell of full screen
turned on, is named as Vsmin1 and record it.
¤Œ
Turn the voltage adjusting knob of Vs DC power supply
to the voltage-up direction slowly until the cell of screen
turned off or over electric discharge.
The first voltage, which makes the cell of screen turned
off or over electric discharge, is named as Vsmax1 and
records it. (Only, Vs voltage variable passes over the
maximum 195V)
¤º
Convert the signal of signal generator to the 100% Full
Green signal.
¤
Repeat the adjustment (2) item and name each voltage
as Vsmin2/Vsmax2 and record them.
¤
Convert the signal of signal generator to 100% Full Blue
signal.
¤
Repeat the adjustment (2) item and name each voltage
as Vsmin3/Vsmax3 and record them.
¤
Convert the signal of signal generator to 100% Full
White signal.
¤
Repeat the adjustment (2) item and name each voltage
as Vsmin4/Vsmax4 and record them.
(Fig. 2) Y Set-up Wave form
wave form
(Fig. 3) Z ramp Wave form
190±5µs
Содержание PDP42V5 Series
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