Power Supply Troubleshooting - Sony DSC-S75 Training Manual

Power Supply Troubleshooting

N Do not repair any of the printed circuit boards on units under warranty. If defective, order a new one and send
the old one back for a refund of the core charge, as per Sony policy.
Troubleshooting the DM-101 power supply board is limited to checking the output voltage levels and control
signal lines on SY-68 connector CN701 and to checking fuses and other components with the board removed.
•
If the camera is dead, the most important voltage to check is the always-on voltage from fuse F004. See
Figure 5-1. Since this fuse provides always-on power to the SY-68 board, that board will not be able to
provide a HIGH to the SYS DD ON line and the power supply will not turn on.
Failure to diagnose this fuse can prevent the technician from determining which board is defective.
Replace the DM-101 board if this fuse is open after first making sure that there is not a short in the SY-68
board that is blowing the fuse.
•
If the lack of a particular output voltage is traced to a blown fuse, make sure to also check the switching
transistors that it feeds for a short.
? A common complaint of the battery not charging or unit not running from ac adaptor is caused by a physically
damaged ac adapter jack. Check this jack before replacing the battery or ac adapter. It is easily lifted out
once the back cover is removed. The part number is for the jack is 1-7940-456-1. See Figure 5-4.
5. DSC-S75 and DSC-S85 Power Supply
Figure 5-4
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