Ncu (Us) - Ricoh A284 Service Manual

PCBS

2.5.2 NCU (US)

S u r g e
TIP
Protection
Over-
RING
current
Protection
T 1
N o i s e
Filter
T 2
Jumpers
Item Description
JP7 These jumpers should be shorted when the machine is connected to a dry
line.
JP8
DB1 Also remove DB1 when the machine is connected to a dry line.
A874
N o i s e C M L
Filter R e l a y
Current
S e n s o r
2-12
O H D I S W .
D B 1
S u r g e
Protection
J P 8
N C U
Detection
J P 7
T R X D
L-
D C L o o p
Transformer
H o o k 0
H o o k 1
E x R i n g
R i n g
Circuit
A874D503.WMF
O H D I S W
C M L S W
SM