— 4 —
SECTION 2
TEST MODE
VIDEO CD COLOR-BARS MODE
On this mode, the data of the color-bars signal as a picture signal
and the 1kHz sine wave signal as a sound signal are output by the
mechanism control microcomputer (IC504) for video CD signal
check. When measurement of the voltage and waveform on the
MAIN board, perform it in this mode.
For reference, the color-bars signal can be observed at J103 (VIDEO
OUT) and the sound signal can be observed at J104 (AUDIO OUT)
using an oscilloscope.
1.
Connect the SL503 (C BAR (MICON)) on the VIDEO board
with solder.
2.
Turn the power on.
3.
After measuring, remove the soldering installed.
SERVO CHECK MODE
1.
Connect the SL502 on the VIDEO board with solder.
2.
Turn the power on.
1)
Coefficient display and gain display
The following hexadecimal data is displayed on the FL tube
when the JOG SELECTOR key is pressed. Every pressing of
the JOG SELECTOR key toggles between the following
displays.
2)
Pressing of the DNR/COMET key toggles between ON and
OFF of the tracking and sled servo.
3)
Pressing the PLAY MODE key (KARAOKE PON in K750)
during playback increases the FB value (every 4 steps).
Pressing the REPEAT key (SURROUND in K750) decreases
the FB value (every 4 steps).
4)
Pressing the ACTIVE key toggles between the normal speed
and double speed.
5)
Pressing the RETURN key toggles between the up FIL and
NO FIL.
6)
Pressing A
⇔
B key performs re-measurement of focus bias.
Display
position
→
Display
mode 1
Display
mode 2
Display
mode 3
Display
mode 4
Display
mode 5
Display
mode 6
Display
mode 7
TRACK
01
02
03
04
05
06
07
INDEX
FB POINT
(when jitter
is minimum)
00
TRVSC
RESISTER
VC
OFFSET
FCS AUTO
GAIN
RF PEAK –
RF
BOTTOM
Set the
present FB
REGISTER
value
MIN
AUTO FB
POINT
FB upper
limit
00
FE
OFFSET
00
RF PEAK
00
SEC
RF JITTER
MINIMUM
VALUE
FB lower
limit
TE
RESISTER
RF
OFFSET
TRK AUTO
GAIN
RF
BOTTOM
Present RF
JITTER
value
TRACK
MIN SEC INDEX
Initial display (K550)
TRACK
MIN SEC INDEX
Initial display (K750)
