Sharp R-8320E User Manual

INDICATOR
Method of Display
Indicator element is Fluorescent Display.
Basically, a Fluorescent Display is a triode having a cathode,
a grid and an anode. Usually, the cathode of Fluorescent
Display is directly heated and the filament serves as cathode.
When a proper voltage is impressed to the filament to heat
it, thermo-electrons are emitted and, with positive voltage
with respect to filament being applied to the anode and grid.
hit against the anode to illuminate the fluorescent body.
If the anode or grid voltage is zero or negative against the
filament, thermo-electrons can not reach the anode, hence
the fluorescent body is not luminescent.
R21
R22
R23
R30
R31
Pi::
Ei
D5
D4
D3
DZ
LSI
lIX2075YA1
D15
014
011
D13
312
\
CIRCUIT
In this model, the Fluorescent Display g-digits, 7-segments
are used for displaying figures, 6-segments are used for
Convection Fan Symbol and letters.
The Fluorescent Display employs the dynamic drive
method, when the high level of anode signal and grid signal
agree, the corresponding segment displays.
Grid (digi?)
Cathode
(filament)
-~
- ------r---_--L---- ---- ---- ------T-----
A A A A A A
3VA.C.
0
G5
4, G4
o G3
4’ GC
4 G2
4 Gl
3.3K
i-
-----__----___ _---
I
L
0 VG (-3Ov)
Figure 24. Indicator Circuit
78

Sharp R-8320E Specifications

General

Brand	Sharp
Model	R-8320E
Category	Microwave Oven
Language	English