Kenwood KDC-MP638U Service Manual page 24

KDC-MP638U/W7041U
/W7141UY/X692/X7009U
∗ The purpose is to shut down audio output. Basically,
the logic sets the audio output system signal line when
in Standby source.
● Key specifi cation
• Other keys than eject and power keys are invalid.
● Display specifi cation
• Display the "PROTECT" string and blink all characters at
1Hz.
∗ Use the indication below with the highest priority (error
message), and maintain the error message even when
the source is changed.
Display example
PROTECT
PWIC_STBY
PWIC_MUTE
AUD_MUTE
The explanations for the following items are same as
those for the 06 model (U717, KDC-W7534U/W7534UY/
X890/X9533U).
24
DC OFFSET ERROR
Blink
alternately
at 1Hz
2.0sec or more 1.5sec or more
0.8sec
Improper connection
detection period
● Cancel Condition
• Press the Reset terminal on the main body. Or set Back-
up to OFF (Unplug and plug back in the DC connector).
The history is maintained (E2PROM data is saved).
• If DC error is detected during the capacitor leak detec-
tion period, the clearing the error by the reset is limited to
4 times.
The startup is inhibited for the 5th time and later reset.
("PROTECT" display has to be blinked.)
● Note while in the test mode
• While in the test mode, even if DC leak is detected, it is
not written into E2PROM.
When an error is detected, the display is enabled.
● Other
• Function for checking and clearing data in E2PROM by a
given key shall be included. (Used at production dpt. and
service center, etc.)
0.7sec or more
1.0sec
AUD_MUTE
(independent H→L→H)
Capacitor leak Other (improper detection etc.)
detection period detection period
OTHER
Refer to the service manuals for these models.
• CD LOAD error detection,
• CD EJECT error detection
• Installer memory specifi cations
• Backup memory specifi cations
50ms
or more