13
MZ-N420D
SECTION 4
TEST MODE
Outline
• This set provides the Overall adjustment mode that allows CD
and MO discs to be automatically adjusted when in the test mode.
In this overall adjustment mode, the disc is discriminated be-
tween CD and MO, and each adjustment is automatically ex-
ecuted in order. If a fault is found, the system displays its loca-
tion. Also, the manual mode allows each individual adjustment
to be automatically adjusted.
• Operation in the test mode is performed with the set.
Setting Method of Test Mode
There are two different methods to set the test mode:
1
Short SL803 (TEST) on the MAIN board with a solder bridge
(connect pin
<zx.
of IC801 to the ground). Then, turn on the power.
Microcomputer
version
display
All off
All lit
Set LCD display
V 1 . 6 0 0
009
888
PGM
GP
SOUND 1 2
2
In the normal mode, turn on the HOLD
.
switch. While
pressing the
ENTER/
NX
key press the following order:
[]
t
[]
t
[VOLUME --]
t
[VOLUME --]
t
[]
t
[VOLUME --]
t
[]
t
[VOLUME --]
t
[GROUP]
t
[GROUP]
Note:
If electrical adjustment (CD and MO overall adjustment) has not
been finished completely, “ERROR” is displayed on LCD of the
set.
Operation in Setting the Test Mode
• When the test mode becomes active, first the display check mode
is selected.
• Other mode can be selected from the display check mode.
• When the test mode is set, the LCD repeats the following dis-
play.
•
When the
ENTER/
NX
key is pressed and hold down, the dis-
play at that time is held so that display can be checked.
Releasing the Test Mode
For test mode set with the method
1
:
Turn off the power and open the solder bridge on SL803 (TEST)
on the MAIN board.
Note:
Remove the solders completely. Remaining could be shorted with
the chassis, etc.
For test mode set with the method
2
:
Turn off the power.
IC852
SL803
(TEST)
– MAIN Board (Side B) –
