Cd Eject Error Detection - Kenwood DPX701 Service Manual

DPX701/701U/701UY
DPX-MP7090U
Operation
LOAD
SW1
(LOS SW)
SW3
(12EJE SW)
SW4
(LOE/LIM SW)
ERR condition
∗ Trigger for starting the sequence: detecting the inserted disc
with SW 1 and 3 LOW edge.
(As an exception, protect LOAD when EJECT error)
Overview
Record the number of times when mechanism error (SW er-
ror) occurred at CD EJECT.
EJECT error recording shall be done in 4 patterns, by the SW
status illustrated below (3 patterns in models other than TYPE-
J).
EJECT error is established when EJECT operation is not com-
pleted after EJECT operation is started before the protect timer
count is completed (False EJECT, or ejection with no CD, is
considered as exception and is not recorded).
(False EJECT is determined when: while chucking is not done,
and when SW status is determined as NO DISC.)
Clearing of record is done in the following situations :
1) After reset is cancelled, when reading EEPROM, the code
is NG.
2) While in test mode, the specified key (Play/Pause key
pressed for 2 seconds) is input.
3) When in EEPROM all-clear initialization mode (refer to
the test mode specification document).
• Indication is shown on the test mode specification docu-
ment.
• Number of times with error(s) is 99 times at MAX.
• Not recorded in test mode [1+3 keys].
• When EJECT was error, re-try 3 times, and count each er-
ror while re-try as 1 error.
22
CD LOAD ERROR DETECTION
q
w
Special
case
LOAD_ERR1
LOAD_ERR2

CD EJECT ERROR DETECTION

q If the protect timer was counted up before the LOS (SW1)
up edge detection, it is recorded as LOAD_ERR1.
w If the protect timer was counted up after the LOS (SW1) up
edge detection, before the LOE/LIM (SW4) up edge detec-
tion, it is recorded as LOAD_ERR2.
∗ When DISC was inserted briefly but pulled out immediately
(DISC is detected but not inserted), it is considered as an
error.
Special case: Even if LOS (SW1) up edge is not detected,
if LOE/LIM (SW4) up edge is detected, it is still recorded as
LOAD_ERR1. Also, if SW4 up edge is detected, the motor
is stopped.
Operation
EJECT
SW1
(LOS SW)
SW3
(12EJE SW)
SW4
(LOE/LIM SW)
ERR condition
EJECT_ERR1
∗ Trigger for starting the sequence: detecting DISC ejection
by EJECT key. (As an exception, protect EJECT when LOAD
error)
q If the protect timer was counted up before the LOS (SW1)
down edge detection, it is recorded as EJECT_ERR1.
w If the protect timer was counted up after LOS (SW1) down
edge before the 12EJE (SW3) down edge detection, it is
recorded as EJECT_ERR2.
r If the protect timer was counted up after LOS (SW1)/12EJE
(SW3) down edge before the down edge detection of any
of these, it is recorded as EJECT_ERR4.
∗ When EJECT is started, if not chucking, it is not counted as
EJECT error (considered as false EJECT). However, EJECT
when SW change is detected.
q
r
w
EJECT_ERR2
EJECT_ERR4