Muratec F-110 Field Engineering Manual page 67

Circuit Description
4-4-2-9. BIAS (supply/dev output unit)
BIAS voltage output is generated only when electrification voltage is set to output. In the circuit presented above, it organizes
enough zener-diodes required to output dev/supply voltage from electrification output.
Supply voltage is output when the supply-ea signal is 'L'. When supply-ea is 'L', Q104 turns off and as Q105 does not turn on,
the electric potential of the output unit retains the electric potential of zener and thus -500V is output as the supply voltage.
In case supply-ea signal is 'H', both Q104 and Q105 will turn on and the electric potential of the output unit will not retain the
electric potential of zener and become GND level and thus the output voltage will become .
The output condition of developer voltage is the same as that of the supply voltage.
U2 7407
MHV-PWM
DEV-EA
SUPPLY-EA
4-34
18V
Q401 A708
R411 2.2K
R403 130K
R404
27K
R402
82K
C408
R412 2K
104
R113
24VS
10K
R114
33K
R115 3.3K
R106
24VS
10K
R107
33K
R108 33K
R112
2K
Q402
R405 220K
D526
24VS
R408 R409
+
47K 390
_ KA324
C403
333
R406
2.2K
R118
Q107 A1413
33K
R116
2.2K
R117 10K
Q106
C3198
Q105 A1413
R111
33K
R110
2.2K
R109 10K
Q104
C3198
T401
24VS
C404
3K/471
D402 C406
3K/471
4KV
R416
15M
R417
15M
ZD401 150V
C107
1K/101
ZD402 150V
ZD403 51V
ZD404 150V
C106
1K/101
ZD405 150V
ZD406 100V
ZD407 100V
MHV
OUTPUT
DEV
OUTPUT
SUPPLY
OUTPUT