Denso BHT-6000 - Manual (Page 81)

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Selecting "6:LCD" on the TEST menu calls up the
test pattern shown at left on the LCD and turns on
the reading confirmation LED in green.
Each time the ENT key is pressed, the screen
shifts to the next test pattern. To return to the
previous screen, press the BS key.
To stop this test while in progress, press the C
key.
[5.6] LCD and reading confirmation LED tests
As shown at left, everything disappear and the
reading confirmation LED lights in red.
The checker pattern shown at left appears and the
reading confirmation LED goes off.
The checker pattern is reversed.
⇑ ⇓
⇑ ⇓
ENT key
ENT key
BS key
BS key
⇑ ⇓
⇑ ⇓
ENT key
ENT key
BS key
BS key
An outline with a width of one dot appears.