MHC-W77AV, STR-W77 - Sony Audio Service Manual (repair manual). Page 5

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Press the ENTER/NEXT and FUNCTION buttons simultaneously.
Then press the MENU 1 button with the following 4 seconds to set the Test Mode.
 1. The message “W3 NA (destination) ” appears on the screen and a 32 cycle square wave of the subcrystal oscillator is output from Pin 24

(AUB. OUT).

 2. Press any key to rotate JOG and all FL indicators light up.

When you rotate JOG at this point, the display changes as follows.
N all FL indicators on Nn FL pattern 1 Nn FL pattern 2 n
The changes and all LED indicators light up.

 3. Again press any key to set the key count check. The following display appears.

0

0

0

The numbers in order from left to right show ; the number of keys pressed, the JOG count (1 click per 4 counts), and the VOL  count.
(1 cycle is a count of 96.)

 4. Press the Power button to reset to the factory settings.

Press the ENTER/NEXT and FUNCTION buttons simultaneously.
Then press the MENU 2 button with the following 4 seconds to set the Test Mode.
 1. The message “AMP TEST” appears on the screen. Press the MENU button to call up the Equalizer Curve for the Amp Test.

However when the function is set to the tuner, use the MENU button to call up each tuner preset from 1 through 5.

 2. Press the Power button to reset to the factory settings.

Press the ENTER/NEXT and FUNCTION buttons simultaneously.
Then press the MENU 3 button with the following 4 seconds to reset the microcomputer to the factory settings.

Press the ENTER/NEXT and FUNCTION buttons simultaneously.
Then press the MENU 4 button with the following 4 seconds.
The message “XTAL TEST ” appears on the screen and a 32 cycle square wave of the subcrystal oscillator is output from Pin 24 (AUB.OUT).
In addition, a square wave of the same frequency as the subcrystal oscillator, is output from 4PIN (POWER. ON/OFF).
Press the Power button to reset to the factory settings.