Sony HCD-CPX11 - DIAGNOSTIC AND REPAIR NOTES

5
HCD-CPX11
JUDGING WHETHER THE SWITCHING REGULATOR IS GOOD OR DEFECTIVE
JUDGING WHETHER THE SUB POWER BOARD IS GOOD OR DEFECTIVE
switching regulator
CN4
• The switching regulator is judged to be good when the terminal voltage at the switching regulator CN4 is 12 V.
SUB POWER board
MAIN board
CN302
• It is judged to be good when the voltage between pin 2 (+4 V) and pin 3 (GND) of the MAIN board CN302 is 4 V.