N Board; Micro Standby And Reset (N Board); Dsp Regulator - Sony CPD-420GS Training Manual

Micro Standby and Reset (N Board)

The +5V DC Standby supply from IC605 (D Board) is routed to IC1001
pin 11 and pin 31 providing VCC operating voltage. The +5V DC standby
supply is also applied to the RESET IC1003/1. IC1003 produces a "Re-
set" pulse at pin 3 when the unit is first turned ON. The 8Mhz master
clock is developed by X1001 IC1001 pin 44 and pin 45.
When the unit is first powered ON, the Degauss command line of IC1001/
5 goes H (+5V) for approximately 5 seconds then returns to a logic L (0V).
At the same time, the 'REMOTE ON/OFF' command from IC1001/7 goes
H (+5V). This signal is routed to the D Board via CN801/16 to enable the
'Active On' mode of the power supply.

N Board

35

DSP Regulator

The DSP IC1002 requires +3.3V DC for proper operating. IC1006/3 (O)
outputs regulated +3.3V DC to IC1002 pins 9,12, 28 and 52. IC1003
provides IC1002/54 (RESET) with a delayed "RESET" H (+5V) via R1105.
The DSP outputs Deflection Drive, Convergence and Geometry Correc-
tion Waveforms to their respective circuits located on the D board.
NOTE: With AC power applied, the output waveforms from the Micro and
DSP should always be present.