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EXPLATION FOR MICOM CIRCUIT
I. Explanation
for PWB circuit
1-1. Power circuit
1. GR-L207ERA,
GR-L247ERA,
GR-B207ERA,
GR-B247ERA
Power circuit consists of SMPS (SWITCHING
MODE POWER SUPPLY) power. The SMPS consist of the rectifying part
(BD1, CE1) converting AC voltage to DC voltage, the switching part (IC2) switching the converted DC voltage, transformer
transferring energy of the primary side of the switching terminal to the secondary side end the feedback
pert (IC3, IC4)
transferring it to the primary side.
Caution
: Since high voltage (DC31OV) is maintained
at the power terminal, please take a measure after more than 3
minutes have passed after removing power cords in the abnormal operation of a circuit.
Voltage of every part is as follows:
Part
VA1
CE1 Vdc
CE2
Voltage
220 Vac
inspection
16 Vdc
CE3
CE4
CE
12 Vdc
15.5 Vdc
5 Vdc
BOI
RVg-15O6
_
I ;
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•Ir l_
comr-
L1
IC2
5
m
L_,._
I ='
T.-.._-_=
_
t--L_
T
i
=
I '_ I '_
I
I
I= I_,.L _=
I=
L
1_t
_
Ic4
]
_
l--
-
_
,
T'" !"T
_I "
T
_:
,I, BI
T,N92
1
2_
ICI
(MICBH)
_ref
E_r
_D
- 31 -
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