Test Mode - Sony MCE-K550 Service Manual

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.
SECTION 2

TEST MODE

SERVO CHECK MODE
1. Connect the SL502 on the VIDEO board with solder.
2. Turn the power on.
TRACK
TRACK
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.
Display
TRACK
position→
Display
mode 1
Display
mode 2
Display
mode 3
Display
mode 4
Display
mode 5
Display
mode 6
Display
mode 7
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.
— 4 —
Initial display (K550)
MIN SEC INDEX
Initial display (K750)
MIN SEC INDEX
INDEX MIN
FB POINT
AUTO FB
01 (when jitter
POINT
is minimum)
FB upper
02 00
limit
TRVSC
03 00
RESISTER
VC FE
04
OFFSET OFFSET
FCS AUTO
05 00
GAIN
RF PEAK –
06 RF RF PEAK
BOTTOM
Set the
present FB
07 00
REGISTER
value
SEC
RF JITTER
MINIMUM
VALUE
FB lower
limit
TE
RESISTER
RF
OFFSET
TRK AUTO
GAIN
RF
BOTTOM
Present RF
JITTER
value