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4. Operational Principles
1) Operation procedures
Refer to the separate instruction manual.
2) Block diagram
Power
transformer
Power circuit
m------
I
I
7
+
Heater control
k!------]
::::i~'m'
I___
I
I
I
I
3) Power circuit
=ircuit
diagram
----J
Icl
Indicator circuit
=
-
---EEcl
1
POWER SUPPLY UNIT (
)
CONTROL UNIT
1
I
Iclol
IN
OUT
I
1
21 VDD
I
T
T
T
I
T
l-pi
G
+ +
T
C106
Clul
I
bl
I
I
I
Vllul
1
]D101-D1o4,
L
1
I
1
t
1
f
"q
Vss
I
I
+oltage
at each point (Ground is shown as Vss)
I
I
@
13V
@
5V
Description of operation
(1)
VDD-VSS
Power supply (5V)
The secondary output of power transformer(PT101
) is given bridge-rectification
by the diode
(D101 -D104)
and the condenser (C107) to produce 13V voltage at@. The voltage at@is used to
compose@ 5V power supply by the operation of constant voltage circuit consisting of 3-terminal
output voltage regulator (ICI 01).
5
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