JVC Model 200 service manual J45, High Voltage Power Supply, J44

Chapter 2---System Description

•Generation of focus voltage (G3) for all three CRTs (RGB)

•Generation of screen (G2 supply-Black Level) voltage for all three CRTs

•Generation of G1 supply (Blanking) voltage

•Dynamic focus amplifier using H and V parabolas

•External ON/OFF and generation of /HV_OK signal

The High Voltage Power Supply I/O diagram (Figure 2-5) and the list of inputs and outputs (Table 2-1), provide an understanding of the operation of the HVPS to allow the technician to perform module level troubleshooting.

T G	J45
M	H VP S _ S YN C 14
R
FR O

M LVPS		+80V		8
	+15V
				9
FR O
	-15
				10
/H V E N A			(/V A _ O K)
				12
(From VPB)

HIGH VOLTAGE POWER SUPPLY

R AN O D E J58 -1

GAN O D E J59 -1 B AN O D E J60 -1

R FO CU S J58 -1

G FO CU S J59 -1

B FO CU S J60 -1

J44

3 A R C G N D

B T O C R T S VIA V AB T O C R T S

1

G 2 S UPP LY

A V A

AR D	H PA R A BO LA		6
M C D BO
	V PA	R A BO LA
			13

J45

G 1 S UPP LY

11

C R T S V I

FR O

5

/H V O K

T O

Figure 2-5.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 2-1. High Voltage Power Supply I/O signals

Raster Timing Generator PCB

INPUT

DESCRIPTION

Model 200 Service Manual 2-11