Dc Control Circuit - NEC MultiSync FP1350 Service Manual

2) DC Control Circuit

CPU (IC801) controls three DAC ICs (IC532, IC751, IC711) through I
DAC output so that the analog voltage corresponds to the DC control data from CPU. IC802 is an EEPROM
which stores the DC control data for preset graphics standard timings.
Table 1 Summary of DAC control (IC532 on DEF PWB: CS0=CS1=CS2=0)
PORT NAME
A01 COR_LT
A02 ROT
A03 EMF
A04 H_LIN
A05 FV_L2
A06 FV_L3
A07 FV_L1
A08 HS
A09 HSM
A10 COR_RB
A11 COR_RT
A12 COR_LB
Table 2 Summary of DAC control (IC751 on VIDEO PWB: CS0=1 CS1=CS2=0)
PORT NAME
A01 -
A02 SUB_BIAS
A03 G_BIAS
A04 G_BRT
A05 B_BRT
A06 B_BIAS
A07 R_BIAS
A08 R_BRT
PORT NAME
D/A OUT1 SHARP1
D/A OUT2 SHARP2
D/A OUT3 SHARP3
D/A OUT4 GAIN_ADJ
Corner Landing Adjustment (LEFT TOP)
Raster Rotation Adjustment
Earth Magnetic Field Correction
Horizontal Linearity Adjustment
Vertical Filter Switch 2
Vertical Filter Switch 3
Vertical Filter Switch 1
Horizontal Size Adjustment
Horizontal Maximum Size Adjustment
Corner Landing Adjustment (RIGHT BOTTOM)
Corner Landing Adjustment (RIGHT TOP)
Corner Landing Adjustment (LEFT BOTTOM)
Not in use
CRT Cut off adjustment
CRT Cut off adjustment (Green)
Brightness tracking adjustment (Green)
Brightness tracking adjustment (Blue)
CRT Cut off adjustment (Blue)
CRT Cut off adjustment (Red)
Brightness tracking adjustment (Red)
Table 3 Summary of DAC control (IC711 on VIDEO PWB)
Picture sharpness control 1
Picture sharpness control 2
Picture sharpness control 3
Video gain adjustment
2
Summary
Summary
Summary
8-23
C BUS. Its analog outputs control