Camera Switches; Overview; Troubleshooting - Sony DSC-S75 Training Manual

Chapter 18 - DSC-F707 Camera Switches

Overview

The camera uses a variety of push button, rotary and slide switches that are mounted on flex board assemblies.
These switches are located on the rear cover, the front cabinet and on the lens assembly. Most switch terminals
are not easily accessible when the camera is operating. When a switch stops responding, either the switch
became defective or a break occurred in its associated flex assembly. In either case, the flex board must be
replaced.

Troubleshooting

Shorted Switches
? In most cases, the camera will be "dead" if a momentary contact switch shorts. The shorted switch will
prevent other switches - including the power ON/OFF switch - from operating.
? If a shorted switch is suspected, the best method of determining which switch is shorted is to disconnect the
switch ribbon cables, one at a time, press the reset button after each try (a shorted switch is likely to latch up
the camera), then attempt to power up the camera. After a few tries, the defective flex assembly will become
obvious.
Open Switches
Open switches can be checked with a Service RM-95 jig to determine if it or the flex board is open. This method
allows the switches to be checked "live" without disassembling the camera. Without the RM-95, the unit must be
disassembled and the switch contacts checked with an ohmmeter at a flex board while simultaneously pressing
the switch (not an easy task).
Testing with RM-95
1. Connect the Service RM-95 to the interface jig and power up the camera.
2. With the RM-95, proceed to data page 2,
3. To check a particular switch, go to the address listed in the table for the switch then activate the switch. If it
is working properly the data shown in the table will be displayed in the RM-95. Note that the active data is not
fixed but can be within a range of numbers shown in the table. For example, when pressing the Control Down
switch, any data between 00 and 0C at address 90 is acceptable.
4. On switches that include a bit number, the binary value of the internal register for that bit must be determined
by using the hex to binary conversion table. The table converts the data displayed on the RM-95 to a binary
register value. The least significant data bit displays the values of bit registers 0 to 3; the most significant
data bit displays the values of bit registers 4 to 7.
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18. DSC-F707 Camera Switches