Sony NW-S4 Service Manual page 4

NW-S4
Work procedure
Preparation:
1. Make sure that no battery is loaded in the set.
2. Start up the test mode "
appears.
3. Connect PC to this set with a USB cable. Check that the block 1 of the following screen "open", and "1PC" is displayed on the LCD
of the set. (The block 1 will "close" if the set is disconnected again)
At this time, a sine wave is outputted from the headphone. Also, the model name is displayed in the block 7 of the screen.
1
7
Note: If the block 1 does not "open", the circuits in MAIN board will be faulty. Audio signals are outputted from the reference signal in the DSP of
the set.
4
" of the service tool ( ) from the PC, and check that the following screen