Heat Controller MSS-009B/A - Troubleshooting; Unit Not Operating

2. Product does
not
operate
at all.
(" Refer to
Electronic
Control Device drawing
and Schematic
diagram.)
Turn
off
Main
Power
.Cý_
(After 10 seconds)
Tum on
Main
Power
Does
"beeping" sound is made
from the
Indoor Unit?
NO
Check
the
voltage
of power(About AC
208V/AC230V, 60HZ)
YES
Primarily, the operating
condition of Micom is OK.
Main power's
voltage
Voltage
applied
to the unit
Connecting method of Indoor/Outdoor
connecting
cable
Check
PWB Ass'y(Outdoor unit)
- Fuse
- Pattern damage
-
Varistor(ZNRI)
Check
the
connection housing for contacting
" Connector related
to CN-POWER
"
Connector related to CN-FAN
"
Connector
contacting of Outdoor Fan/Compressor
" Display PWB Ass'y
Check
"
Connector related to
CN-DC/DC
Check
each load(Indoor/Outdoor Fan
Motor,
Compressor,
Stepping Motor) and
contacting
condition of related
connector(including
connecting
cable
of
Indoor/Outdoor Unit)
PCB Board Operation
Check
Items
Content
Remedy
" Power Transformer
(Outdoor unit)
Input Voltage
-About
AC208V/230V&10% -Check
the power voltage
"
Replace
Trans
Output Voltage
About AC17t3V
I&
" IC2(7812)
Output
"
DC +12V
"
Replace
IC2
(Indoor/Outdoor unit)
4
" IC3(7805)
Output
"
DC +5V
" Replace IC3
(Indoor/Outdoor unit)
I&
" IC4(KIA7036,
Reset IC)
"
Voltage of
Outdoor
unit
Micom No.
8, " Replace
faulty parts
X01(4MHz)
Voltage of Indoor unit Micom No. 43 and
soldering
(Indoor/Outdoor
unit)
condition
-50-
LJ
"