Transmission Power Circuit (30 V) Check Procedure

If “ is” not displayed by the remote control, investigate the points of the trouble by the following procedure and correct it.

No.

Check Item

Judgment

Response

 

 

 

 

1

Disconnect the transmission line from TB3

DC24~30 V

Check the transmission line for the following, and

 

and check the TB3 voltage.

 

correct any defects.

 

 

 

Broken wire, short circuit, grounding, faulty

 

 

 

contact.

 

 

 

 

 

 

Except the above-mentioned

Go to No. 2

 

 

 

 

2

Check if the following connectors are

Connector disconnected

Connect the connectors as shown on the electric

 

disconnected in the outdoor unit’s control

 

wiring diagram plate.

 

box.

 

 

 

 

 

 

MAIN Board: CNS1, CNVCC3, CNVCC4

Except the above-mentioned

Go to No. 3

 

INV Board: CNVCC2, CNVCC4, CNL2,

 

 

 

CNR, CNAC2

 

 

 

 

 

 

3

Disconnect the wires from CNVCC3 on the

DC24~30 V

Check the wiring between CNS1 and TB3 for the

 

Main board and check the voltage between

 

following, and correct any defects.

 

pins 1 and 3 on the wire side of the

 

Broken wire, short circuit, grounding, faulty

 

CNVCC3.

 

contact.

 

Tester + ..... 1 pin

 

If there is no trouble, replace the Main board.

 

Tester - ..... 3 pin

 

 

 

Except the above-mentioned

Go to No. 4

 

 

 

 

 

 

4

Disconnect the wiring from CNVCC2 on the

DC24~30 V

Check the wiring between CNVCC2 and

 

INV board and check the voltage between

 

CNVCC3 for the following, and correct any

 

pins 1 and 3 of CNVCC2.

 

defects.

 

Tester + ..... 1 pin

 

Broken wire, short circuit, grounding, faulty

 

Tester - ..... 3 pin

 

contact.

 

 

 

 

 

 

Except the above-mentioned

Go to No. 5

 

 

 

 

5

Disconnect the wiring from CNL2 on the

0.5~2.5Ω

Go to No. 6

 

INV board, and check the resistance at

 

 

 

 

 

 

both ends of choke coil L2.

Except the above-mentioned

Replace choke coil L2.

 

 

 

 

6

Disconnect the wiring from CNR on the INV

19~25Ω

Go to No. 7

 

board, and check the resistance at both

 

 

 

 

 

 

ends of R7.

Except the above-mentioned

Replace R7.

 

 

 

 

7

Check the resistance at both ends of F01

0Ω

Go to No. 8

 

on the INV board.

 

 

 

Except the above-mentioned

Replace F01

 

 

 

 

 

 

8

Check the voltage between pins 1 and 3 of

AC198~264 V

Replace the INV board.

 

CNAC2 on the INV board.

 

 

 

Except the above-mentioned

Go to No. 9

 

 

 

 

 

 

9

Check the voltage between L2 and N on

AC198~264 V

Check the wiring to CNAC2 for the following and

 

power supply terminal block TB1.

 

correct any defects.

 

 

 

Broken wire, faulty contact.

 

 

 

 

 

 

Except the above-mentioned

Check the power supply wiring and base power

 

 

 

supply, and correct any defects.

 

 

 

 

–82–

Page 83 Page 85
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Image 84
Mitsubishi Electronics P500YMF-C, PURY-P400 specifications CNR, CNAC2, CNVCC3
Page 83 Page 85

PURY-P400, P500YMF-C specifications

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