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Chapter 2---System Description
HVPS_SYNC Square wave HCT level with 50 or 33% duty cycle synchronized to
horizontal sync.
V
ideo Processor PCB
INPUT DESCRIPTION
/HV_ENA The HVPS enable line. A low enable the HVPS (VA_OK from VPB).
V
ideo Amplifier PCB
OUTPUTS DESCRIPTION
G1_SUPPLY DC supply about -150 V for driving the G1 of CRTs
G2_SUPPLY DC supply about 1.3 KV for driving the G2 of CRTs
ARC_GND Return (ground) line for the CRT anodes
Conver
g
ence/Deflection PCB
INPUTS DESCRIPTION
H_
PARABOLA
Horizontal parabola for use by the dynamic focus amplifier
V_
PARABOLA
Vertical parabola for use by the dynamic focus amplifier
S
y
stem Controller PCB
OUTPUT DESCRIPTION
/HV_OK The high voltage status line. Low = operational HVPS
Low Volta
g
e Power Suppl
y
INPUTS DESCRIPTION
+ 15V + 15 V for use by the HVPS
+ 80V + 80 V for use by the HVPS
- 15V - 15V for use by the HVPS
2-12 Model 200 Service Manual