Sony DNW-A75 Maintenance Manual page 121

To execute the check
(1) Insert the alignment tape SR5-1(for 525/60 system) or
SR5-1P (for 625/50 system).
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To complete the check, the inserted cassette tape
requires the continuous playback-able recorded portion
more than a check execution time.
The check execution time is usually about ten seconds
in each channel check and about 80 seconds in an ALL
check.
(2) Turn the search dial to set the * mark to a channel to
be checked or "ALL".
. Usually, select "ALL".
(3) Press the SET button to initiate the automatic check.
. The check is initiated after automatically running the
tape in the PLAY mode.
. During the check, the message "Auto Tracking ..."
or "Auto Checking ..." will be displayed.
During ALL check execution, the check result in the
channel will be displayed every time a one-channel
check is completed.
The time data display area displays an ordinary time
counter.
. To cancel the check, press the MENU button once.
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. When no cassette tape is inserted, the message
"Insert SR5-1" will be displayed.
In this case, insert the alignment tape. The check is
then initiated after automatically running the tape in
the PLAY mode.
. If the message "Auto Check (Push SET)" is continu-
ously displayed, the non-recorded portion on the
tape is judged to be check. Set the tape position to
the beginning of recorded portion.
. Keep the unit until automatic check is completed.
Check cannot be properly performed in other mode
than PLAY mode.
If the unit enters into other mode than PLAY mode,
the check freezes or the condition becomes "RED".
DNW-A75/A75P
(4) Check to see the result of checking.
. When no abnormality is found, "GRN" will be
displayed on the right of the selected channel or
"ALL".
. If the message "Auto Check Failure" is displayed,
refer to the "For Check Failure (C11)" on next page.
. If the message "Condition NG" is displayed or if the
conditions other than "GRN" are displayed on the
right of the checked channel, refer to the "For
Condition NG (C11)" on page 4-33.
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. If the check results for all channels are "RED" when
displaying the message "Condition NG" in ALL
check, refer to the "For Check Failure (C11)".
. "GRN", "YEL", or "RED" is also displayed in the
time data display area. In only the time data display
area, it cannot be discerned whether the condition is
NG or check failure when displaying "RED".
The check result for each channel is displayed in the
time data display area on turning the search dial after
completing ALL check.
(5) To exit the menu, press the MENU button once.
To execute the check again in this menu, go to step
(2).
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To change the cassette tape before starting the check, press
the SET button while pressing the EJECT button.
The tape is then ejected without influencing the check
result. Insert another cassette tape and press the PLAY
button. The check is then initiated. This operation does not
coincide with the message on the superimposed display.
4-2. TAPE Maintenance Mode (M0)
4-2-4. RF CHECK Mode (C1)
4-31