JVC 250 service manual 5.10 CRT/Yoke Assemblies, CRT/Yoke Assemblies - Main Function

Chapter 5---Electronics

5.10 CRT/Yoke Assemblies

CRT/Yoke Assemblies - Main Function

!CRTs converts image signal to image light

!Yokes provide horizontal and vertical deflection for CRTs

!Yokes provide x-axis and y-axis convergence correction for CRTs

CRT/Yoke Assemblies - Inputs

To Yokes

H_RGB_YOKE (pos.) - top of red, green, and blue horizontal yokes. V_RGB_YOKE (pos.) - top of red, green, and blue vertical yokes.

RGB_LOCK (pos.) - interlock for red, green, and blue yokes (5 V when closed or 15 V when open).

X_RGB_YOKE (pos.) - top of red, green, and blue X-axis Convergence yokes. Y_RGB_YOKE (pos.) - top of red, green, and blue Y-axis Convergence yokes. To CRTs

Anode Voltage from High Voltage Power Supply (25 kV).

Focus Voltage from High Voltage Power Supply (7 kV).

RGB G1 - G1 grid signal from Video Amplifier PCB.

RGB G2 - G2 supply voltage from Video Amplifier PCB (about 600-800 V).

RGB_CATHODE - video output signal from the Video Amplifier PCB (about 40 Vpp with a peak voltage of about 70 V).

RGB_HEAT (pos.) - positive side of CRTs heater voltage (about 6.2 V).

CRT/Yoke Assemblies - Output

From Yokes

H_RGB_YOKE (neg.) - bottom of red, green, and blue horizontal yokes. V_RGB_YOKE (neg.)- bottom of red, green, and blue vertical yokes.

RGB_LOCK (neg.) - interlock for red, green, and blue yokes (5 V when closed or 0 V when open).

X_RGB_YOKE (neg.) - bottom of red, green, and blue X-axis Convergence yokes.

Y_RGB_YOKE (neg.) - bottom of red, green, and blue Y-axis Convergence yokes.

From CRTs

RGB_HEAT (neg.) - negative side of CRTs heater voltage (0 V).

ARC_GND - CRTs ground (Anode supply return line).

Model 250 Service Manual 5-51