Adjustment - Daewoo DP-42SM Service Manual

3. Adjustment

3-1. Application Object
This standard is applied to the PDP42V5#### PDP Module which is manufactured by the
manufacturing team of PDP promotion department or elsewhere.
3-2. 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:65V, Vs:190V
- DC/DC Pack voltage : Vsetup:220V, Vscw:115V,
- Ve:-35V, -Vy:-75V
- Preliminaries environment : Temp (25 5 C), Relative humidity (65 10%)
(2) Module should get the Aging for the equilibrium after finish the assembling. Aging condition is
shown below.
- Service signal: 100% Full White, Red, Green, Blue pattern signal (Service time of each pattern
: within minutes/cycle)
- Service DC voltage : Match the voltage with the set up voltage in the first adjustment.
- Aging time : More than 4Hrs
- Aging environment : Temp (60 2 C), Relative humidity-Less than 75%
(3) Module adjustment should be followed by below sequence.
- Setting up the initial voltage and adjusting the voltage wave form of Vsetup
- Measuring the Margin of Vs voltage and deciding the voltage
- Adjusting and checking the voltage of DC/DC pack (Vsetup, Vscw, -Ve, -Vy)
- Adjusting the voltage wave form of Vset-down
- Measuring the voltage margin of Vset-up and deciding the voltage
- Adjusting the wave form of final voltage
But, these items above can be changed by the consideration of mass production. (When
changing the sequence, there should be an agreement of the Module development 2Gr/ QA Gr/
Manufacturing Gr)
(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.
3-3. Adjustment items
3-3-1. Adjusting the Board Group
(1) Adjusting the voltage wave form of Vset-up
(2) Adjusting the voltage wave form of Vset-down
(3) Adjusting the voltage wave form of Vramp
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