Hughes JVC 100, Service Manual

Page: 26 / 127

Chapter 2---System Description
2-14 Model 100 Service Manual
ARC GND
G2 SUPPLY
G1 SUPPLY
/HV OK
R FOCUS
G FOCUS
B FOCUS
R ANODE
G ANODE
B ANODE
H FOCUS SIG
V FOCUS SIG
+15V
+15V
-15
(VA_OK)
H VPS_SYNC
CN1
18
14
CN5
CN1
1
3
5
11
12
13
17
15
16
(From VPB)
HIGH
VOLTAGE
POWER
SUPPLY
9
19
IIC CLK
IIC DATA
CN1 IS CONNECTED TO J104 BACKPLANE
CN5 IS CONNECTED TO CN201 REGULATOR PCB
+5V
20
Figure 2-7 High Voltage Power Supply, I/O Diagram.
The HVPS Input/Output
This section provides a comprehensive description of the inputs to and outputs
from the HVPS. The I/O descriptions are arranged by the source/destination of the
signal. The format used is such that the assembly communicated with is used as
the primary heading of each output. Input refers to an input to the HVPS. Output
refers to an output from the HVPS. In each case the signals direction is noted.
Table 2-3
Inputs and Outputs for the HVPS
Inputs
LVPS
+15V Power for analog circuitry.
-15V Power for analog circuitry.
+5.1V Power for digital circuitry.
SC/RTG
HVPS SYNC Synchronization pulse for the HVPS, synchronized with the
selected Horiz. Sync at either same, half or on third the
frequency.
IIC DATA IIC data line. Bi-directional serial line for synchronous data
transfer between the SCB/RTG, the HVPS, video processing
and deflection processing PCBs.
FROM SYSTEM
CONTROLLER
/
RTG
FROM LVPS
FROM
DEFLECTION
PROCESSOR
T
O
C
R
T
S
TO
REGULATOR
PCB
TO
SYST
EM
CONT