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Mitsubishi Electric PURY-P72 Service Handbook page 207

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[ IX Troubleshooting ]
1. Error Code
(THMU-A)
4115
Power supply signal sync error
2. Error definition and error detection method
The frequency cannot be determined when the power is switched on.
3. Cause, check method and remedy
(1)
Power supply error
(2)
Noise filter problem
Coil problem
Circuit board failure
(3)
Faulty wiring
(4)
Wiring failure
Between noise filter board CN02 and control board
CNAC
(5)
Control board failure
1. Error Code
4115
(YHMU-A)
Power supply signal sync error
2. Error definition and error detection method
The frequency cannot be determined when the power is switched on.
3. Cause, check method and remedy
(1)
Power supply error
(2)
Noise filter problem
Coil problem
Circuit board failure
(3)
Faulty wiring
(4)
Wiring failure
Between noise filter CN3, noise filter CN2, transformer
box, and control board CNAC
(5)
Control board failure
HWE0803A
Cause
Cause
- 198 -
Check method and remedy
Check the voltage of the power supply terminal
block (TB1).
Check the coil connections.
Check for coil burnout.
Confirm that the voltage at the CN02 connector is
188 V or above.
Check fuse F01 on the control board (or F1, F2).
Confirm that the voltage at the control board con-
nector CNAC is 188 V or above.
If none of the items described above is applicable,
and if the trouble reappears even after the power is
switched on again, replace the control board.
Check method and remedy
Check the voltage of the power supply terminal
block (TB1).
Check the coil connections.
Check for coil burnout.
Check that the voltage across TB21 and TB22 on
the noise filter board is 414V or above.
Check F01 on the control board, F4, and F5 for a
blown fuse.
Confirm that the voltage at the control board con-
nector CNAC is 190 V or above.
If none of the items described above is applicable,
and if the trouble reappears even after the power is
switched on again, replace the control board.
GB
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