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DP-7020
CIRCUIT DESCRIPTION
4. Test mode
With the DP-7020, the microprocessor can be set to
test mode by short-circuiting pin 7 and pin 8 of the CD
PLAYER UNIT (X32-1500).
Note : "Set mode" shows the normal status.
Are
the TEST
pia
short:
circuited?
OPEN/CLOSE
key
——
|
PLAY key,
CLOSE
key
Yes
Tray close
—=J
t
Track Nos
2, 7,8, 9, 11, 14, and 16
are automatically
programmed
Other than
OPEN/CLOSE key.
anicak
4-1. Key and functions valid in test mode
Input key
Function
i
i
cd
eae
Track No. display
(1) Focusing servo ....
~.. ON
. OFF
{3} Feed servo
. OFF
TRACK
NO.
(2) Tracking servo
_ ON
i
(3) Feed servo..
. ON
}
1 | PLAY
'
\
PLAY (DB) Key lights
L
|
seen
eene!
a,
-_
7
Disk track No and time are displayed
il
TRACK
NO
2 | STOP
Jump to the first stop of TEST mode.
m4
i
ue
t
T
=
—
marae
=
|
(1) Focusing servo
ON
TRACK NO
3
Ar
eee
(2) Tracking servo ..
riot
ti
ot
PAUSE (BB)
blinking
PC}
lights.
(1) Tray...
;
... Opened
|
| (2) Laser...
. ON
TRACK NO
:
rt
#)
DOWN:
Wet)
The TEST mode goes on when the tray is closed by pressing the tray.
ul
REPEAT]
lights
5 | FF
b>
| In the STOP mode, moves the pickup slightly toward the outer position of disc.
6 | FB 44
in the STOP mode, moves the pickup slightly toward the inner position of disc.
When the tray is opened and the closed again in test mode, Track Nos
2,7,8,
7 | OPEN/CLOSE
9,11,14, and 16 are automatically programmed,
8 | DISPLAY OFF | All of FL's segments are light and PLAY and PAUSE indicator light.
16
DP-7020
CIRCUIT DESCRIPTION
4-2. Flow chart of test mode
@
Flow chart from tray OPEN status after power ON
$3 : ON
7 sec.
elapsed?
Cancellation
of tray
CLOSE
Memory
data store
&
6
7 sec.
—
elapsed?
NO
NO
feed of PU
YES
Cancellation
of tray
OPEN
NO
01 displayed
in TNO
Was OPEN/
CLOSE key
pressed?
Acceptance
of key
CLS : Tray close detect switch
OPEN : Tray open detect switch
SLT : Pickup start timit switch
7
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