3.1 Product Overview
Chassis MT02 is using the MT82xx series as the main chip embedded the MCU, Scaler,
RAM, Video decoder and Audio processor. The circuit outside and alignment is very simple.
The power consume is 180W
˄
Max.
˅
, the standby consume less than 1W. The Sound
speaker’s power is 2x5W.The PSU has 3 part voltage output: one 5v for standby, one 24v for
inverter, one 12v for signal process.
There are 4 boards for signal process: main board, SCART board, side AV board, keypad
board.
Support 1x RF in, 0.5x SCART, 1XSCART, 1xYPbPr, 1xVGA, 1xside AV include YC input,
1xHDMI,1x headphone out. The details please refer the SyRS.
3.2 Main Board Alignment
y
Before power on, please check and make sure the output of U27
ˈ
U29
ˈ
U21
ˈ
U30
ˈ
U20,U22,U23,U31,U37 are not shorted to grand.
y
Supply 5v to JP12A and test the output of U30,U22, the normal is 3.3V+/-5%, the
U23 output should be 1.8V+/-5%.
y
Download the SW to the main chip; please see the chapter of how to download.
y
Check all the function of the all others board on the test tool.
3.3 Final Alignment
3.3.1
Port Functional pre test
Equipment
Patten
Standard
Tuner
Cable
Full band
Picture & Sound is
OK
SCART
1/2/SAV-CVBS
PM5418
PAL, half color &
Gray bar
Picture & Sound is
OK
SCART1/SAV-YC
PM5418
PAL, half color &
Gray bar
Picture & Sound is
OK
SCART1/-RGB
PM5418
PAL, half color &
Gray bar
Picture & Sound is
OK
SCART1 CVBS out
Cable
First channel
Out put Picture &
Sound is OK
HDMI
DVD
with
HDMI
certification
Movie, 720P@60HZ
Picture & Sound is
OK
VGA
Chorma
2327/DVD
with VGA
1024
h
768@60Hz
half color & Gray
Picture & Sound is
OK
Headphone
Cable
First channel
Sound is OK
Loud Speaker
Cable
First channel
Sound is OK
YUV(YPbPr)
Chroma 2327/BSG-3
60A/DVD
1080i@60HZ
half
color & Gray
3 ALIGNMENT PROCEDURE
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