Ncu (Us) - Ricoh B089 Service Manual

BOARDS

4.2.3 NCU (US)

Surge
TIP
Protection
Over-
RING
current
Protection
T1
T2
Jumpers
Item
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.
B576
Noise CML
Filter Relay
Current
Sensor
Noise
Filter
OHDI SW.
DB1
Surge
Protection
JP8
NCU
Ring
Detection
Circuit
Description
4-4
JP7
TRXD
L-
DC Loop
Transformer
OHDISW
CMLSW
Hook0
Hook1
ExRing
B576D902.WMF
SM