18
Abnormal
Maintenance Service and Trouble shooting
Check the horizontal oscillation external
circuit of Z280 N201 and N201
Normal
There is
breakdown in
CRT broad
Check circuit
between pin18
pin20 in N201
No raster
Check if G2 voltage on CRT board is normal
Check heater voltage
Check the base electrode voltage of V444
2.
Check the voltage betwecn
bace electrode and
connector electrode of v411
Check the circuit
between pin 32 at N210
and H drive grade
Check all
voltages of pins
at X602
The heater
resister is
broken.
Check the connector
electrode voltage of
V411
There is breakdown in horizontal
drive grade, Check V444 T401
R437
Check if FBT T402
V411or C415
C416 are
leakage of electricity
Check if pin 28
voltage 9V at
N201 is normal
Rechange bad
components or
remedy content
circuit.
Check 9V
power
Normal
Abnorma
Normal
Abnormal
Normal
Abnormal
Abnormal
Yes
No
Lower
Normal
Normal
Abnormal
V411 is rosin joint or
broken
