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Wandel Goltermann DTX-1

This is a Teletex test device designed + manufactured by Wandel+Goltermann.

It supports

EPROM images

Manuals

Service Manual and Annex are also available.

Service / Repairs

lack of display contrast

It has been observed that several units have problems with display contrast, even when the respective trimmer potentiometer is maxed out. The cause is leaking electrolytic capacitors in the contrast voltage generation circuit, see pictures below.

20230302_143704.jpg 20230302_143628.jpg 20230302_143607.jpg

After replacing the related capacitors C12, C13, C16 adn C17 on the LCD controller board, the original adjustment range of the contrast trimmer potentiometer could be restored.

Updated by laforge 2 months ago · 2 revisions

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