Panasonic MC-BJ870-S149 Service Manual page 25

6.3.3.2. Checking the P.C.B A unit
■What to check/Method
<Check 1> Checking the insertion, connection and conduction conditions of the connector housing
• Make a visual check of whether the lead wires A unit and relay connectors are properly inserted and connected.
• Make a visual check of whether the lead wires A unit and P.C.B D unit connectors are properly inserted and connected.
• Check that there is no burnout or poor connection, etc. of lead wires A unit by performing a conduction check using a tester.
<Check 2> Checking the condition of soldering on soldered lead wires and soldered connector posts
• Make a visual check of soldered lead wires/connector-post parts for poor soldering, broken trances, etc.
• Check that there is no burnout or poor connection, etc. of lead wires by performing a conduction check using a tester.
<Check 3> Checking whether there is a blown current fuse
• Make a visual check of soldered parts for poor soldering, broken trances, etc.
• Check current fuse conduction using a tester.
*A blown current fuse could cause a layer short in the Motor assy or a locked fan, so also check the Motor assy.
(If there is a blown current fuse due to an abnormality in the Motor assy, replace both the P.C.B holder A unit and the Motor assy
together.)
<Check 4> Checking whether there is a blown current fuse
• Make a visual check of soldered parts for poor soldering, broken trances, etc.
• Check current fuse conduction using a tester.
<Check 5> Checking whether there is a blown current fuse
• Make a visual check of soldered parts for poor soldering, broken trances, etc.
• Check current fuse conduction using a tester.
<Check 6> Visual check of the P.C.B A unit for any cracking, damaged electrical components, poor soldering,
broken trances, etc.
■Action
• Securely connect connector housings.
• Replacing the P.C.B A unit
• If there is a blown current fuse due to an abnormality in the Motor assy, replace both the P.C.B A unit and the Motor assy
together.
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