61
4. Troubleshooting
4-2 Electrical Malfunction
* Replace Low Voltage Transformer
* Replace Main PCB.
Ok
Ye
No
s
* Measure resistance and voltage
of Low voltage Transformer
(please refer to Fig.1)
*Check whether primary resistance of
Low voltage Transformer is in normal.
Fig.1 : Low voltage Transformer
No
color voltage resistance
Primary
white
120V
(input)
75 ~ 80Ω
Secondary 1
red
13.5V
1.5 ~ 2.5Ω
Secondary 2 yellow
8V
0.8V ~ 1.5Ω
*Thermal Fuse with built-in Low voltage
Transformer will be open if resistance is
more than MΩ.
Ok
*Measure voltage of voltage Regulator
on main PCB.
IC02(7812) : DC 12V
IC03(7805) : DC 5V
END
END
(Input 120)
(Input 120)
13.5V (Red)
8V (Yellow)
13.5V (Red)
8V (Yellow)
