DR. JOHANNES HEIDENHAIN GmbH
D-8225 Traunreut .Tel.(O8669)31-0
SERVICE MANUAL TNC 151/155
Page 14.1
Kundendienst
Section 2.2.3
Visual Display Unit BE 411 in conjunction with TNC 155
The Display Units BE 411 is supplied by 11 Vds from the units
own integrated power supply. A defect in this power supply
may cause an apparent CRT display fault.
If the fault is not due to the detective power supply, it is
likely to be due to the CLP-Graphics Board, which contains
the control circuitry for the Display Unit. This can be
verified by exchanging the board for one which is known to
function correctly.
If the fault still persists then must be due either to bad
connections within the TNC (eg on the Connector Board), or
to faults on both the VDU and the CLP-Graphics Board.
See the diagram opposite for a logical procedure for
locating the fault in the system.
Testing of the VDU BE 111/211 and associated circuitry
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