Ricoh A250 Service Manual page 445

PCBS
2.6.3 NCU (EUROPE/ASIA)
S H U N T
T1
TIP
R I N G
R 1
G S
GS Sw.
S H U N T
T1
TIP
Noise
Filter
R 1
G S
Control Signals and Jumpers
Country
CTR21
Australia
South Africa
Malaysia
Hong Kong
New Zealand
Singapore
Asia
CTR21 (Common Technical Regulation 21):
France, Germany, UK, Italy, Austria, Belgium, Denmark, Finland, Ireland, Norway,
Sweden, Switzerland, Portugal, Holland, Spain, Israel, Greece
A250
CML Relay
Current
Sensor
CSEL1 RSEL
CN2-5 CN1-13
H H
H H
H H
H H
L L
L L
L L
L L
L: Low, H: High
Noise
Filter
Filter
(16Hz)
DO Sw.
OHDI Sw.
Ring
Detection
Circuit
2-24
D C -
Loop
A891D521.WMF
D C L S W
T R X D
D O S W
O H D I S W
C M L L S W
Hook0
Hook1
G S S W
C S E L
R S E L
ExRing
SM