Mpeg P.w.board Operation - Sanyo FISHER DVD-1500 Service Manual

MPEG P.W.BOARD OPERATIONAL
(General operation diagram)
Numbers ~ encircled and shadowed represent relevant waveforms.
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AC POWER ON
Power on
Standby LED goes out.
Flickering of screen
OPEN image appears on monitor.
Blue indicator illuminates.
Disk rotates.
VFD : READING" indicated.
PLAY LED illuminates.
PLAY BACK
Flickering of screen
Standby LED illuminates.
Check each signal and voltage referring to relevant block diagrams.
This is a basic explanation.
Master RESET : IC130 +5V Detection
X8001 Oscillator start
IC116 MPU-IC118, 119 communication start
IC117 DRAM access
IC015 each RESET signal (IC116 ,110,142,143,144 2,5 pin)
RESET_ADAC -> IC115 reset
RESET_VENC -> IC002 reset .......... Flickering of screen
RESET_DVD -> IC127 reset ........... Flickering of screen
RESET_DRIVE -> Loader reset
IIC-BUS communication
IC601 User interface CTL ........ Standby LED Lighting
IIC-BUS communication check
Open screen
DATA : IC118,119
Control : IC116
MPEG : IC127 Image Generation
V-ENC : IC002 Image signal
IC601 user interface CTL ........ Blue LED Lighting
Loader CTL ....... Disk turn
IC601 user interface CTL ........ VFD indicate "READING"
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PLAY LED Lighting
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