Adjustment - HP PL4260N Service Manual

1. Application Object
This standard is applied to the PDP50X3#### PDP Module
which is manufactured of PDP promotion department or
elsewhere.
2. Notes
(1) Without any special specification, the Module should be at
the condition of preliminaries more than 10minutes before
adjusting.
Service signal : 100% Full White signal
Service DC voltage : Vcc: 5V, Va: 60V, Vs: 195V
DC/DC Pack voltage : Vsc: 115V, Vzb = 100V, -Vy : -200V
Preliminaries environment : Temp (25 5°C), Relative
(2) Aging shall be performed of module in order for
characteristics stabilization after completion of assembling
/adjustment. Conditions of aging are as follows.
Service signal : 100% Full White, Red, Green, Blue pattern
signal(Service time of each pattern : within 5minutes/cycle)
Service DC voltage : Match the voltage with the set up
voltage in the first adjustment.
Aging time : More than 4Hrs
Aging environment : Temp (25 2°C), Relative humidity-
Less than 75%
(3) Module adjustment should be followed by below sequence.
Initial voltage setting.(Vs=195V, Va=60V, Vcc=5V)
-Vy Voltage adjustment (200V)
Vscan Voltage adjustment (115V)
Y ramp Waveform adjustment.
Y set_up Waveform adjustment.
Y set_down Waveform adjustment.
Vzb Voltage adjustment (100V)
But the above item may be altered by consideration of
mass productivity.
(There shall be consultation and agreement of Research
Office / Development Office / QA / Production
Department in case when altering sequence order.)
(4) Without any special specification, you should adjust the
Module in the environment of Temp (25 5°C) and
Relative humidity (65 10%)
Caution) If you let the still image more than 10 minutes(especially
The Digital pattern or Cross Hatch Pattern which has
clear gradation), after image can be presented in the
black level part of screen.

. Adjustment

humidity (65 10%)
3. Adjustment after Assembling
3-1. Using Tools
Conditions of aging are as follows.
(1) Digital oscilloscope : More than 200MHz
(2) DVM(Digital Multimeter) : Fluke 187 or similar one
(3) Signal generator : VG-828 or similar one
(4) DC power supply
- DC power supply for Vs (1) : Should be changeable
between 0V to 200V/ more than 10A
- DC power supply for Va (1) : Should be changeable
between 0V to 100V/ more than 5A
- DC power supply for 5V (1) : Should be changeable
between 0V to 10V/ more than 10A
- DC-DC Convertor Jig(1) : Vs, Va, 5V Jig with
corresponding output to each voltage Pin arrangement of
PDP50X3#### Module after the input of voltage.
- Voltage stability of power supply : Within 1% for Vs/Va,
within 3% for 5V
3-2. Connection diagram of measuring
instrument and setting up the initial
voltage
(1) For connection diagram of measuring instrument,
refer to (Fig.1) Connection diagram of measuring
instrument
(2) Setting up the initial voltage
Vcc: 5V, Va: 60V, Vs: 195V
But, Initially setting up voltage can be changed by the set
up range according to the Module's characteristic.
3-3. How to Adjust
1. Connect the measuring instrument to be (Fig.1).
2. How to adjust Y SUS( Adjustment should be done
after setting Vs/Va to the set voltage)
(1) -Vy Voltage adjustment
Measure the voltage between -Vy TP in the lower part
D7 and in the upper part Q4 of Y SUS B/D, and adjust
it.
Turn the variable resistor of -Vy DD_pack(PS101) on Y
SUS B/D to set to (-200 ±0.5V).
(2) Vscan Voltage adjustment
Measure the voltage between the left Vsc TP and the
Drain part of G2 on Y SUS B/D, and adjust.
Turn the variable resistor of V scan DD_pack(PS102)
on Y SUS B/D to set to (115 ±0.5V).
(3) Connect oscilloscope probe B1 and GND on Y
sus B/D.