MHC-VX33 (serv.man2) - Sony Audio Service Manual (repair manual). Page 13

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• This mode is used to check operations of the respective sections
of Amplifier, Tuner, CD and Tape.

Procedure:
1.

Press the three buttons of x , ENTER and DISC 3
simultaneously.

2.

A message “TEST MODE” appears on the FL display tube.

3.

 When  f (CURSOR UP)  button is pressed, GEQ increases to
its maximum and a message “GEQ AMX” appears.

4.

When  F (CURSOR DOWN)  button is pressed, GEQ decreases
to its minimum and a message “GEQ MIN” appears.

5.

When  g (CURSOR LEFT)  or  G (CURSOR RIGHT)  button
is pressed, GEQ is set to flat and a message “GEQ FLAT”
appears.

6.

When the VOLUME control knob is turned clockwise even
slightly, the sound volume increases to its maximum and a
message “VOLUME MAX” appears for two seconds, then the
display returns to the original display.

7.

When the VOLUME control knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and
a message “VOLUME MIN” appears for two seconds, then
the display returns to the original display.

8.

In the test mode, the default-preset channel is called even when
the TUNER is selected and an attempt is made to call the preset
channel that has been stored in memory, by operating the Shuttle
knob.  (It means that the memory is cleared.)

9.

When CD is selected and the  EDIT  button is pressed, the disc
that is being chucked at this moment becomes the default
setting.  It means that the default disc only is accessed when
any other discs are selected even though the display indication
changes accordingly.  At the same time, the  DISK SKIP EX-
CHANGE  and  OPEN/CLOSE  cannot be accepted.  (It means
that the tray motor and the turntable motor are disabled of their
operation.)

10. When a tape is inserted in Deck B and recording is started, the

input source function selects VIDEO automatically.

11. When x button is pressed to stop recording, the Tape (Deck)

B is selected and tape is rewound using the Shuttle knob, tape
is rewound, tape is stops at around the record-starting position
and playback of the recorded portion of the tape is started.  If
PAUSE is inserted even once during recording, tape is rewound
to the position around the PAUSE position and is played back.

12. When the  CD SYNC HI-DUB  Button is press during playback

of Deck B, either normal speed or high speed can be selected
by this button.

13. Select the desired loop by pressing the  PLAY MODE  button.

Insert a test tape AMS-110A or AMS-RO to Deck A.

14. Press the  SPECTRUM  button to enter the AMS test mode.
15. After a tape is rewound first, the FF AMS is checked, and the

mechanism is shut off after detecting the AMS signal twice.

16. Then the REW AMS is checked and the mechanism is shut off

after detecting the AMS signal twice.

17. When the check is complete, a message of either OK or NG

appears.

18. When you want to exit this mode, press the  ?/1  button twice.

The cold reset is enforced at the same time.