Service manual

Sync Selection
If the synchronization is derived from Y or Green, the H and V sync from the sync-slicer
must be selected.
• When YPbPr-signal or RGB-signal is 480p-format: sync signals will be V-770 and
H-770-2 sync.
• When YPbPr-signal or RGB-signal is 1080i-format: sync signals will be V-770
and H-770-3 sync.
When the sync is separate (H and V), the sync of the source must be selected.
The IO-4, IO-5 control-lines select the sync-inputs of the HEF4052 (7102.)
In our figure, these control-lines are named SYNC SELECT 2 and SYNC SELECT 1.
Via IO-6 line (called TRISTATE SYNC), the sync output can be put in tri-state.
Control Function
The different selections are made by the I/O expander, controlled by I2C.
These selections can be made with the user interface.
Audio
Audio left and audio right are connected via the two cinches and passed through the
module.