Samsung SMH7178STD/XAA, Fast Track Troubleshooting

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CN05 Gas Sensor
3-
4 5vdc
CN202 Pwr & Relay
1-(CN201-1) Main
3-(CN201-1) TT
5-(CN201-1) Vent Low
7-(CN201-1) Vent High
9-(CN201-1) Vent Boost
Main PCB
CN201 Relay, Lamp, SMPS
1 Line 1
3-1 RY202 In Rush Relay Neutral Contact
5-1 RY206 Bright Lamp Relay Neutral Contact
5-1 RY205 Night Lamp Relay Neutral Contact
7-1 RY207 Louver
RY203
Power
High Relay
RY209
Fan
RY208
TT
RY201
Main
Relay
RY05
Night
Relay
RY206
Bright
Relay
RY202
In
Rush Relay
Door Interlock Ass’y
CN401 Door Connector
1 Door sw
3 Door sw
3-5 12vdc
4-5 5vdc
The fuse is located on the noise filter.
1.
Disconnect power and remove grille and Assembly
Control Box.
2.
Replace the fuse.
3.
When 20A fuse blows out by the operation of interlock
monitor switch failure, replace the primary interlock
switch, secondary interlock switch, door sensing switch,
interlock monitor switch and power relay.
4.
When the above four switches operate properly, check
if any other part such as the control circuit board, blower
motor or high voltage transformer is defective.
CN01
1) KEY OUT-1
2) KEY OUT-2
3) KEY OUT-3
4) KEY OUT-4
5) KEY OUT-5
6) KEY OUT-6
7) KEY OUT-7
8) KEY OUT-8
9) KEY OUT-9
10) KEY IN-1
11) KEY IN-2
12) KEY IN-3
13) KEY IN-4
14) KEY IN-5
15) KEY IN-6
16) KEY IN-7
RY207
Louver
RY204
Power Low
Relay