Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Power Transistor Inspection

NOTE: Use an analog circuit tester in the following test procedures.


1. Disconnect the electrical connector to the Power Transistor.

Power Transistor Test:





2. Connect the positive lead of an ohmmeter to terminal # 7 of the Power Transistor.

3. Connect the negative lead of the ohmmeter to terminal # 2 of the Power Transistor.
Continuity should NOT exist.

4. Connect the negative lead of a 1.5 volt battery to terminal # 7 of the Power Transistor.

5. Check for continuity when the positive lead of the battery is connected to terminal # 8 of the Power Transistor.
Continuity should exist during connection.