Denso BHT-7000 - Manual (Page 83)

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Chapter 2. Getting Started the BHT-7000 and System Mode
The fine checker pattern appears.
The fine checker pattern is reversed.
Two right-angled triangles appear.
An outline with a width of one dot appears.
⇑ ⇓
ENT key BS key
⇑ ⇓
ENT key BS key
⇑ ⇓
ENT key BS key
Press the ENT key, and the BHT-7000 beeps once
and returns to the TEST menu.