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UD-300
28
Test Mode
CIRCUIT DESCRIPTION
Setting the Test Mode
This microprocessor built in this unit can be put to
TEST MODE by just short-circuiting the test pins (#7
and
#8).
The TEST MODE
can be also initiated with short-
circuiting the test pins when tray is OPEN. If unit is
in test mode,
TRACK
No. displays ''05"'.
1-2. Key and functions valid in test mode
No.
Input key
Function
:
Track No. display
1
PLAY
(1) Focusing servo
............... ON
TRACK
NO.
(2) Tracking servo ................ ON
a
>
(3) Feed Servo veeeescssececssesees ON
ry -
Ll
t
Displayed
for a few
seconds
after completion (1), (2) and (3).
{
bi.
7
Disc Track No. is displayed.
2 | UP
(1) Focusing servo
..............- ON
TRACK NO.
(2) Tracking servo
..............05 OFF
m7
ppl
(3) Feed servo ..........cceeeee eens OFF
i
|
3 | STOP
(1) Focusing servo
............... OFF
:
TRACK
NO.
(2) Tracking servo ................ OFF
m7
of
(3) Feed servo ..........eeceeee eee OFF
Li
sy
4 | DOWN
Track No. 7, 8, and 6 (High-speed) are programmed and
=
ki
playback from Track No. 7. The test mode is cancelled.
_
5
OPEN/CLOSE
When the tray is opened then closed. Track No. 7, 8, and 6
TRACK
NO.
are programmed and set is in STOP mode.
cto
4
The test mode is cancelled.
Liss
INITIAL SET-UP
DSP IC
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