Service manual

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OVERVIEW
1.1 Explanation
- HD PERSONAL VIDEO RECORDER & RECEIVER or PVR(Personal Video Recorder)-STB(Set-Top Box)
stores video and audio data into HDD with a specific form while receiving the ground wave of HD digital
broadcasting only or gives additional related services.
- Configuration
It uses IBM PPC405GP of PowerPC series as CPU, which supports PCI Bus I/F for PVR. VSB section exe-
cutes VSB decoding for ATSC signal with IF(44MHz) as an input entered from the tuner and transfers TP
data by decoding ATSC signal via VSB decoding to PVR section and HD-1.
MPEG Decoder supports MP@HL by using HD-1 and uses an external AC-3 Decoder.
PVR section stores only necessary data of TP data from the digital TV signal into HDD via IDE I/F chip.
The overall structure is as follows:
- System section
CPU, Main Memory, MPEG-II Decoder, AC-3 Decoder, Flash Memory, Audio DAC, CPLD
- PVR section
PCI I/F, PDR-Pro executing TP De-Mux, Memory, IDE I/F Chip
- VSB section
Generate TP signal by transferring the IF of the desired channel from the RF signal received from the tuner
to VSB receiver.
- Front section
Receive various user key inputs and display the status of the set-top box on the LED.
- Power section
Supply the DC power to the main digital board and HDD by using AC 120V as an input.