Sony UP-21MD Service Manual page 78

input Biock
Tn the input block, the flow of a signal is as follows:
Signal input terminal (IF-851) - ADC (VPR-74) - DRAM (VPR-74)
Monitor Output Block
In the monitor output block, the flow of a signal is as follows:
DRAM (VPR-74) - Encoder (VPR-74) - Signal output terminal (IF-851)
Print Output Block
In the print output block, the flow of a signal is as follows:
UP-21MD V1