Kyocera FaxSystem(M) Service Manual page 85

2-2-2 NCU PWB
FCPWB
LINE1
Noise
fileter
circuit
LINE2
C038, C039
EARTH
TELOFHKn
TEL SEL
DCCONT
Q47
Q48
Accounting
pulse
elimination
circuit
C041, C042
C043
Ground start
circuit
DB20, PC20
External telephone
off-hook detection
circuit
U11
DC/DC converter on/off
circuit Q48, Q49
DC/DC converter circuit
Q47
Off-hook detection circuit
photo coupler PC40
Figure 2-2-3 NCU PWB block diagram
PC20
DB20
PC40
Figure 2-2-4NCU PWB silk-screen diagram
Noise
fileter
circuit
Relay
circuit
Q10
TEL_DET1
TEL_DET2
V10
U11
YC1
3KH
Surge
absorption Line
section
(modular
V10, V12
connector)
V11
Tel
(modular
connector)
V11
V12
2-2-5