Sram; Sbu - Ricoh FACSIMILE FAX77 Field Service Manual

CN18 - NCU
Name
Pin
A1 COM1 Ground
B1 COM1 Ground
A2 5EXTDI
Service mode (L: Enabled) 5
Ringing signal detector output 5
B2 EXRING
A3 PRG1 FromVariable Resistor
Not used
B3 XRITON
PRG0
A4 To Variable Resistor
B4 EXHOK1 Dc loop detection (active L) 5
A5 EXHOK0 Dc loop detection (active L) 5
B5 NCUSIG Tx/Rx signal
A6 NCUSL0 Ds relay drive (L: On)
B6 NCUSL4
OH relay drive (H = Fax) 0
A7 NCUSL1 Gs relay drive (L: On)
B7 N.C. Not used
1DISW
A8 Di switch drive (active H) 0
B8 - 5V Not used
A9 + 24V Not used
Not used
B9 COM1
A10 COM1 Not used
B10 + 5V Power supply to NCU
A11 COM1 Ground
B11 COM1 Ground
Function
CN19 - Printer Jam Sensor (SB-5)
V Pin
1
0
2
0
3
0
CN20 - Paper Width Jam Sensor (SB-AB - Asia
0
only)
0
Pin
1
0
2
0
3
5
5

2. SRAM

CN1 - FCU
5
0

3. SBU

0
CN2 - FCU
7-6
Function
Name
+ 5V Power supply
COM1 Ground
5SB5 Sensor output (analog)
Function
Name
+ 5V Power supply
COM1 Ground
5SBAB Sensor output (analog)
See FCU CN1.
See FCU CN10.
Note: The pin numbers are reversed.
V
5
0
0.2
V