Zenith H19F34DT Series Service Manual page 32

components. After replacement is made, confirm proper
anode voltage using the following procedure.
Measurement of the CRT anode voltage must be performed
using a high impedance-high voltage meter, with no
raster on the screen, and operating at normal horizontal
frequency. 15.75 KHz. (NTSC signal).
After discharging the CRT, connect a high impedance-
high voltage meter to the CRT anode. Turn the television
"on" and confirm a good signal is being displayed. Reduce
Brightness and Contrast setting until the procedure is
well extinguished.
Observe the anode voltage on the meter reading and
compare with the table below for the proper CRT screen
size. If the voltage reading is higher than the maximum,
verify circuit component values and proper operation.
CRT anode Voltage
Nominal Anode Voltage
CRT Screen Size
19" 26 ± 1.0
20" 26 ± 1.0
24"/25" 28 ± 1.0
27" 28 ± 1.0
32" 30 ± 1.0
COMPONENTS WITH ANY INFLUENCE IN HV INCREASE
COMPONENTS WITH ANY INFLUENCE IN HV INCREASE
Fly-Back Transformer
Deflection Yok e
CX3216
CX3210
CX3212
CX3252
CX3256
RX3022
HV SHUTDOWN PROCEDURE
1 After discharging the CRT, connect a high
impedance-high voltage meter to the CRT
anode.
2 Access Video Menu and adjust the brightness
and contrast controls for minimum screen
luminance (beam current to 0mA).
SR25-3828VD0171B
SERVICE ADJUSTMENTS (continued)
Max. Shutdown Voltage
(KV) (KV)
32
32
34
34
36
RX3015
RX3013
ZDX3004
RX3704
RX3703
RX3705
3 Wait until the Video Menu or display appears.
4 Connect a variable Resistor (1M ohm) in parallel
with RX3703, and decrease slowly the resistance
value until shutdown occurs.
5 Measure high voltage shutdown.
3-3
CL - SERVICING