Chapter 2---System Description
Table
| Video Processor Board |
|
|
INPUTS | DESCRIPTION |
|
|
RED_VIDEO | Video preamp signals. About 0.5 VPP |
GRN_VIDEO |
|
BLU_VIDEO |
|
|
|
G1_BIAS | Brightness control line. 0 to 5 V DC |
|
|
RED_G2 | Black level (G2) control lines 0 to 3.1 V |
GRN_G2 |
|
BLU_G2 |
|
|
|
RESTORE | Video DC restoration pulse. logic HC positive going 4% duty cycle |
|
|
|
|
OUTPUTS | DESCRIPTION |
|
|
|
|
/VA_OK | VAB status line. Low = good VAB. High = Bad VAB (This signal is |
| called /HV_ENABLE at the HVPS). |
RED_BEAM | Cathode beam current lines. about 1 volt per 100 UA |
GRN_BEAM |
|
BLU_BEAM |
|
|
|
|
|
| High Voltage Power Supply |
|
|
INPUTS | DESCRIPTION |
|
|
G1_SUPPLY | Supply for G1 grid of CRTs. About |
|
|
G2_SUPPLY | Supply for G2 (screen) grid of CRTs. About 1200 V |
|
|
RED_FOCUS | Focus supply for CRTs. about 7 KV |
GRN_FOCUS |
|
BLU_FOCUS |
|
|
|
|
|
OUTPUTS | DESCRIPTION |
|
|
ARC_GND | CRT ground (anode supply return line) |
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|
|
| Horizontal/Vertical Deflection Board |
|
|
INPUTS | DESCRIPTION |
|
|
|
|
/SWEEP_OK | Deflection detection line. open collector, low = good deflection |
|
|
Model 200 Service Manual |
