Philips PM 5191 Operating Manual page 77

E 3-23
1-91 1117
for about 1 second and changes then to
1— 92 --—--
as a request to press the second key in the first row. In case of a failure, the display would show
Err 1— 961 X — XX
where x — xx indicates the wrong code (row and column). This error indication will
only be reset by
pressing the requested key — in case of a hardware failure at the keyboard unit it would
not be possible
to get the right code and thus to reset the error message.
When the last key was pressed, the keyboard test is finished and the display indicates ''End'.
To leave
this diagnostic submodule and to get back to the test menue, the key MODULATION
OFF must be
pressed.
TEST 3: Storage register test
Attention:
This memory test damages the register contents. When the instrument is switched on after
the storage
The display indicates
MEMO 1 —
and the program starts to write a test pattern into each location of the memory chip, reads it again, and
checks this value for correctness. When no failure was detected, the same will be done with a second pat-
tern. In case that there is no failure, the display shows
MEMO 1 — 1
and in case of a failure
MEMO 1 — @