— 19 —
SECTION 4
TEST MODE
MD Block
Outline
•
In this machine, the overall adjustment mode in which the
automatic adjustments of CD and MO are performed, is
established when the machine enters the test mode. In the overall
adjustment mode, the loaded disc is identified whether it is CD
or MO disc, and the various adjustments are performed in the
order as shown below. When a fault is found during the test
mode, location of a fault is displayed. In servo mode, the various
adjustments are performed automatically too in the order as
shown below.
How to enter the test mode
There are two methods to enter the test mode:
1. The method of enter the test mode by shorting the TEST
soldering bridge
Connect the solder bridge TAP803 (TEST) on the MAIN board
by soldering (i.e., connecting IC801
!∞
to GND), and turn on
the main power.
2. The method of enter the test mode by pressing the keys
While depressing the
(
key, press the keys
+
,
+
,
=
,
=
,
+
,
=
,
+
,
=
,
P
,
P
in this order.
How to exit the test mode
1. When the solder bridge TAP803 is shorted to enter the test mode,
turn off the main power and remove soldering from the TAP803
to open the solder bridge.
2. When the machine has entered by pressing the key, turn off the
main power of the machine to exit the test mode.
Operation when setting the test mode
When machine enters the test mode, the following initial display
appears on LCD and the display changes as described below.
< LCD display on the machine >
•
On the LCD of the machine, the sequence of display starting
from the all segments turn on
→
all segments turn off
→
ROM
version display, is repeated.
< LCD display on remote control >
•
On the LCD of remote control, the sequence of display starting
from ROM version display
→
all segments turn on
→
all
segments turn off, is repeated.
•
On both of the machine and remote control, the display is held
as long as the
P
key is being pressed which enables to check
the LCD display.
Test mode configuration
Test mode of this machine consists of the following five modes.
•
In the modes other than the overall adjustment mode, the mode
number appears in the
0
0
0
block.
}
}
100
Segment block
ROM version display
SHUF
V1 . 00
ROM version display
Segment block
Dot block
Servo mode
Segment block:
Audio mode
Segment block:
Segment block:
Segment block:
Segment block:
Function mode
Power supply mode
Overall adjustment mode
+
key
(on the machine)
p
key
=
key
000
100
200
040
300
Display when setting the test mode
key and VOLUME – key
