Panasonic MC-BJ870-S149 Service Manual page 26

6.3.3.3. Checking the P.C.B B 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 connector housing from the P.C.B A unit is properly inserted and connected.
• Check that there is no burnout or poor connection, etc. of lead wires from the P.C.B A unit by performing a conduction check
using a tester.
<Check 2> Visual check of the P.C.B B unit for any cracking, damaged electrical components, poor soldering,
broken trances, etc.
<Check 3> Measuring resistance value at P.C.B B unit connectors
• Measure the resistance value at connector CN700 (between pin 3 and pin 4) when the "BRUSH OFF/ON", "AUTO/HIGH" and
"OFF" switches are pressed.
Resistance value when "BRUSH OFF/ON" switch is pressed ===> 2.13kΩ±0.2kΩ
Resistance value when "AUTO/HIGH" switch is pressed ===>330Ω±30Ω
Resistance value when "OFF" switch is pressed ===>0Ω to 30Ω
*If the results of <Check 1>, <Check 2> and <Check 3> are normal, there may be an abnormality in the P.C.B A unit.
■Action
• Securely connect connector housings.
• Replacing the P.C.B B unit
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