Counter And Segment Waveforms - Sharp PC-1350 Service Manual

- 10 -
h5 = 1 h5 = 0
All digits off (DIS=
L)
VAL
VsH
On
VsL VAH
Out
VAL VsH
ON ON ON ONOFFOFFOFIFdFFOFFOFFON ON ON ON ON ON ON ON OFF
All digits off
VD! S=VBL .._
Segment waveform
VML-.
VBH -- ------~
Backplate (H1) waveform
VMH -- ---····-····-··---------·
VAL -- -------i
GND=VAH--
Segment output waveform
H1 H2 H3 H4 H5 H6 H7 H8 H9 HlO Hll H12 H13 H14 H1 H2 H3 H4 H5
------·----·--··--------------------------------.
-·····-·········-··-····--------------.
···----------···----------------,
hl (TRl)
h2(TR2)
h3(TR?)
h4(TR4)
h5(TR5)
DIS
RES
HA
• Counter and segment waveforms
-
PC-1350