5-2-2 When the Touch Key pad and Led Display
1)Check points
(1)Is the voltage of the power source normal ? (the rating voltage ±10% range.)
(2)Is the electric wire in good contact ?(CN71, RY71)
(3)Is the connection of the assembly main PCB, and TOUCH KEY PAD in good contact?
Turn off the power, and then turn it on again
five seconds later.
Troubleshooting
Normal operation
Check the micom (IC05) for a short, and replace it.
N |
| When the LED display is | When the membrane key is |
| N |
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| not operated. | not operated. |
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| Y |
| Y |
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N |
| Is the voltage of the micom | Is the voltage of the |
| N |
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| (IC05) No.1, 2, 38~43 port a | micom (IC05) No.13, 14 port |
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| square wave? | a square wave? |
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Normal operation
Check the micom (IC05) for a short, and replace it.
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| Y |
| Y |
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| Is the voltage of the micom |
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Check the micom |
| N | Is the voltage of the micom | N | |||
(IC05) for a short, |
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| (IC05) No.3, 4, 10, 11, 44 port | (IC05) No.3, 4, 10, 11, 44 |
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and replace it. |
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| a square wave? | port a square wave? |
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Check the micom (IC05) for a short, and replace it.
Check the Q901~ Q905 for a short, and replace it.
Check the IC06 for a short, and replace it.
Y
NIs the voltage of the
Q901 ~ Q905 square wave?
Y
NIs the voltage of the
IC06 No. 10~16 a square
value?
Y
Replace the membrane
key pad.
Y
Replace the membrane key pad
FRIEDRICH AIR CONDITIONING CO. |
