SDP-EP70, SDP-EP90ES - Sony Audio Service Manual (repair manual). Page 15

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After executing the test mode, be sure to perform initialization.

While pressing the  AC-3 RF  button and  DIGITAL3  buttons
simultaneously, press the  POWER  button. When the VOLUME
LED starts blinking, release the buttons. “initialized (J/SP/AEP)”
will be displayed on the fluorescent display tube, and all internal
settings will be returned to the initial values.

While pressing the  AC-3 RF  button and  DIGITAL4  buttons
simultaneously, press the  POWER  button. When the VOLUME
LED starts blinking, release the buttons. “initialized (U/CA)” will
be displayed on the fluorescent display tube, and all internal set-
tings will be returned to the initial values.

NOTE: As all histories of abnormal DSP operations will be erased,

note down the contents of the history beforehand.

• This check is always performed when the power is turned ON.

Therefore when an error occurs, it can be known without setting
the test mode because the VOLUME LED blinks and the fluores-
cent display tube stops displaying.

• When an unintended button is pressed during the test mode or

initialization, the VOLUME LED also blinks, and the fluorescent
display tube stops displaying, preventing no mode to be set.

In the personal use of the unit at home, if no sounds are produced
due to DSP problems, the DSP will be rebooted automatically to
attempt recovery. If no sounds are still produced after five retries,
“Turn POWER SW off!” will be displayed on the fluorescent display
tube.
If this problem occurs, it indicates that the DSP is faulty or the
user’s setting environment may be unsuitable. Refer to “3. Self-
Diagnosis Mode for Servicing/Display of History of DSP Errors”
on page 13 to identify the problems.