157 lines
5.4 KiB
TeX
157 lines
5.4 KiB
TeX
\chapter{Video Monitor Adjustments (VAXstation 2000)}
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\setcounter{page}{1}
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\section{Introduction}
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This chapter describes how to adjust the VR260 monochrome monitor for
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its best picture. Alignment and adjustments for MicroVAX 2000's terminals
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are not covered in this guide. See the terminal's pocket service guide for
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all alignments to MicroVAX 2000's terminals.
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\section{VR260 Monochrome Monitor}
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Adjustments to the monitor are made with its cover removed. If the monitor's
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cover is not already removed, remove it (\para{3.12.1}) and then
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reconnect the power cable and the video cable to the monitor.
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FoUow the procedures in order. The success of one adjustment may depend
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on the accuracy of preceding checks and adjustments with the exception of
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the focus and G2 adjustments.
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When the procedure teils you to display a test pattern, enter console mode
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(\para{2.2.2}), attach a loopback connector (p/n 29-24795) to the 25-pin
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communication port, and then type the appropriate test command listed in
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\tabref{4-1}. \tabref{4-1} lists the base video alignment patterns and the test
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commands that invoke them.
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\begin{tbl}{Base Video Alignment Test Commands}{c l c}
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\textbf{Test Command} & \textbf{Test Pattern} & \textbf{Loopback Required} \\
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\hline
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60 & Circle cross-hatch & X \\
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61 & Screen of all E's & \\
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62 & White screen pattern & \\
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\end{tbl}
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\newpage
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You will need the followine tools to adjust the VR260 monitor.
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\begin{itemize}
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\item Alignment tool (p/n 29-24746-00)
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\item Metric measuring tape (p/n 29-25342)
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\end{itemize}
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\subsection{Preparations}
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\begin{enumerate}
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\item Switch on power to the VR260 monitor and the system.
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\item Set the brightness and contrast controls to their maximum positions (\figref{4-1}).
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\item Wait 30 seconds for the monitor to warm up, then adjust the brightness
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to extinguish the raster.
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\item Adjust the contrast for normal viewing level.
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\end{enumerate}
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Refer to \figref{4-2} for the adjustment locations on the VR260 monitor.
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\newpage
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\fig{MA-7567-83}{Brightness and Contrast Controls}
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\newpage
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\fig{MA-0116-87}{VR260 Infernal Adjustment Locations}
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\subsection{Horizontal and Vertical Linearity and Focus
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Adjustments}
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\begin{enumerate}
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\item Display the circle cross-hatch pattern (TEST 60). If the customer is having
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problems with text, display the all E's pattern (TEST 61) for a
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reference check.
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\newpage
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\item Adjust the horizontal linearity (UN) (use the hex trimpot) for horizontal
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uniformity of the squares across the display. The display should contain
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32 horizontal squares and fill the screen. Refer to \figref{4-3}.
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\fig{MA-0117-87}{Circle Cross-Hatch Display}
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\item Adjust the vertical linearity (VL) (use the flat-bladed trimpot) for vertical
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uniformity of the squares up and down the screen. The display should
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contain 27 vertical squares and fill the screen.
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\item Adjust the focus (use a long handled flat-blade screwdriver) for the best
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vertical/horizontal line sharpness. Check an intersection of the crosshatch
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pattern that is at least three squares in from any one of the four corners.
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\end{enumerate}
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\newpage
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\subsection{Width, Height, and Centering Adjustments}
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\begin{enumerate}
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\item Display the white screen display (TEST 62).
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\item Adjust the brightness so the raster is visible.
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\item Adjust the contrast for normal viewing level.
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\item Adjust horizontal centering (H CENT) (use the flat-blade screwdriver)
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until the raster is centered.
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\item Adjust the horizontal phase (HP) so the video is centered in the raster.
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\item Adjust the brightness to extinguish the raster.
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\item Measure the width of the display with the tape measure as shown in
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\figref{4-4}. The display should have a 334 mm width. Adjust width (use
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the hex trimpot) until the display measures 334 mm across.
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\caution{Avoid scratching the screen surface with the metal clip of the tape.
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Start the measurement at 10 cm (100 mm) as shown below.}
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\fig{MA-0756-85}{Width and Height Measurements}
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\newpage
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\item Adjust the vertical height (VH) and the vertical centering (VC) so that
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the display touches the top and bottoni edges of the screen at the same
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time.
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\item Measure the height of the display with the tape measure. The display
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should have a 282 mm height. Adjust the vertical height (VH) until the
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display measures 282 mm top to bottom.
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\end{enumerate}
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\subsection{Rechecklng the Display}
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\begin{enumerate}
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\item Display the circle cross-hatch pattern (TEST 60).
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\item Check the vertical and horizontal linearity of the Squares. Readjust if
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needed (\para{4.2.2}, steps 2 and 3).
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\item Check the vertical and horizontal centering, the height, and the width
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of the display. Readjust if needed (\para{4.2.3}).
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\end{enumerate}
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\subsection{Adjusting Minimum Raster}
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\begin{enumerate}
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\item Set the brightness to maximum and the contrast to minimum. A raster
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should be faintly visible.
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\item If no raster is visible, adjust G2 (use a flat-blade screwdriver) until a
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raster is faintly visible.
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\item Adjust the brightness and contrast for normal viewing.
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\end{enumerate}
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\subsection{Reassembling the VR260 Monitor}
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\begin{enumerate}
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\item Switch the System power switch and the monitor power switch off.
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\warning{Wait at least 30 seconds after you turn off power to unplug the
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power cord. Static electricity dissipates for 30 seconds after power is tumed off.}
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\item Disconnect the power cord and the video cable from the monitor.
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\item Reverse the procedure in \para{3.12.1}.
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\end{enumerate}
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