NEC MultiSync FP1350 Service Manual page 194

8-8. Posistor's Automatic Selective Circuit
When the power switch is turn on, the voltage of C610 is detected by IC6V1.
If AC input voltage is less than AC 150V, IC6V1 output is high.
This will cause Q6V1 and RL6V2 to turn on.
Then the posistor TH6V2 is connected in parallel with TH6V1.
If AC input voltage is more than AC 150V, IC6V1 output is low. This will cause Q6V1 to turn off, and the
posistor TH6V2 is not connected.
To Degaussing Coil
TH6V1
AC
To Auxiliary Winding
L622
D622
R6V2
TH6V2
R6W3
R6V5
RL6V2
Q6V1
R6V4
C6V2 R6V3
(Fig.8-8) Posistor's Automatic Selective Circuit
R6V9
R6V6
R6V7
R6W0
IC6V1
IC6V1
R6V8
8-46
To C610
D6V4
R6W1
D6V3
C6V3
ZD6V1 C6V4
R695
R694
R6W2