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Very helpful and complete manual. Maybe only one negative is schematics have sometimes unreadable name of the parts. But it's not a big problem.
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Excellent high quality schematics brought my old Heidelberg back to life. Fast download at a reasonable price. Thanks.
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This document is just what I was looking for, it´s very useful, it contains adjustment procedures for the final stage of the power amp and also
has a complete wiring diagram and description of the main semiconductors used in the design.
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Dear Sirs,
Thank you for the fast support, the manual does provide all necessary information to repair the radio. All schematics are in a good quality for reading.
The manual fits 100% to my requirements as a technican.
Kind regards Thomas
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the big video recorder format s-vhs many features delicate in loading system of the cassette. Such machines are no longer manufactured, it would be too expensive.
V_SHIFT Apply a circle test pattern via RF, change Vertical Shift by pressing �? /? � buttons till the test pattern is vertically centered. Horizontal line at the center of the test pattern is in equal distance both to upper and lower side of the picture tube. Check and readjust V_SHIFT item if the adjustment becomes improper after some other geometric adjustments are done. It can be adjusted between 0 � 63. SERVICE BLANK It is set ON to make vertical shift correctly centered. After adjustment of vertical shift, it is set as OFF to unblank half screen of the picture. VERT_AMP Apply a circle test pattern via RF, change Vertical Amplitude by pressing �? /? � buttons till horizontal black lines on both the upper and lower part of the test pattern become very close to the upper and lower horizontal sides of picture tube and nearly about to disappear. Check and readjust VERT_AMP item if the adjustment becomes improper after some other geometric adjustments are done. It can be adjusted between 0 � 63. UPPER LIN. Change Upper Linearity by pressing �? /? � buttons till all the size of squares of the test pattern become in equal size from the top of the screen to its bottom of the whole screen. Check and readjust UPPER LIN. item if the adjustment becomes improper after some other geometric adjustments are done. (especially after than VERT_S_CORR. adjustment) It can be adjusted between 0 � 126. LOWER LIN. Change Lower Linearity by pressing �? /? � buttons till all the size of squares of the test pattern become in equal size from the top of the screen to its bottom of the whole screen. Check and readjust LOWER LIN. item if the adjustment becomes improper after some other geometric adjustments are done. It can be adjusted between 0 �126. VERT_S_CORR. Change Vertical S-Correction by pressing �? /? � buttons till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical center of the test pattern. Check and readjust VERT_S_CORR. item if the adjustment becomes improper after some other geometric adjustments are done. It can be adjusted between 0 � 126. HOR SHIFT Change Horizontal Shift by pressing �? /? � buttons till the the test pattern is horizontally in equal distance both to right and left sides of the picture tube. Check and readjust HOR SHIFT item if the adjustment becomes improper after some other geometric adjustments are done. It can be adjusted between 0 � 255. HOR LINEARITY Change Horizontal Linearity by pressing �? /? � buttons till all the size of squares of the test pattern become in equal size from the top of the screen to its bottom of the whole screen. Check and readjust HOR LINEARITY item if the adjustment becomes improper after some other geometric adjustments are done. (especially after than HOR S CORR adjustment) It can be adjusted between 0 � 255. HOR S CORR Change Horizontal S Correction by pressing Left/Right buttons till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical center of the test pattern. Check and readjust HOR S CORR item if the adjustment becomes improper after some other geometric adjustments are done. It can be adjusted between 0 � 127.
42 AK53 D.O.C. Service Manual 22/03/2004
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