Service manual

FO-DC550 CIRCUIT DIAGRAM 14 - 40
10 22 18 16
1
23
9 2 8
21
3
20 24 17
6
MCU PWB
CN16
14
5
12 15
4
11 13
7
19
1 2 3 4 5 6
7 8 9
10
11 12 13 14 15 16 17 18 19 20 21 22 23 24 26 25
MDM_IRQ PB_NAE0 PB_ADDR1 PB_ADDR6 PB_DATA1 PB_DATA5 PB_DATA7 PB_ADDR5 PB_DATA0 PB_DATA4 D-GND PB_MOE PB_NWE D-GND PB_ADDR0 PB_ADDR3 D-GND (/FAX_RST) PB_NCS1 PB_ADDR2 PB_ADDR4 PB_ADDR7 D-GND PB_DATA2 PB_DATA3 PB_DATA6
CN37
5
D7
D-GND
17EN5V
D-GND
16
D1 D4
15 18VCC3 19 14
D-GND D3 MSU_ST1 2 D0 VCC3
6
12
9
/RD P-GND D2
3
MODEM_IN 24V
4
20
8 7
CN38
13
D5 /CS4
D6
1
11 10
Personal Computer (IEEE1284 port)
TO TEL
DIR3 P3 /PACK PBSY P0 P4 D-GND P2 PERR 5V P6 /STB /FLT /IT3 /SELIN3 P7 /AFEED3 D-GND VCC3 P1
/RESET
SLCT 5V P5
MDM_IRQ PB_NAE0 PB_ADDR1 PB_ADDR6 PB_DATA1 PB_DATA5 PB_DATA7 PB_ADDR5 PB_DATA0 PB_DATA4 D-GND PB_MOE PB_NWE D-GND PB_ADDR0 PB_ADDR3 D-GND (/FAX_RST) PB_NCS1 PB_ADDR2 PB_ADDR4 PB_ADDR7 D-GND PB_DATA2 PB_DATA3 PB_DATA6
FAX PWB
24 18 20 26 25 23 22 21 19 17
6 7 4
12
9
16
5 3 8
10 14 15 13 11
2 1
VOUT1 VOUT2
CN10
D7
D-GND EN5V D-GND D1 D4 VCC3 D-GND D3 MSU_ST1 D0 VCC3 /RD P-GND D2 MODEM_IN 24V D5 /CS4
D6
10
8 7 2 5
13
9
19 18 14
4 6
17 20
1 3
11 16 15 12
CN2
1 2
SPEAKER
CN1
1 2 3 4
5V USB DATA + DATA - D-GND
CN33
Personal Computer(USB PORT)
(3) I/F & FAX SECTION (3/3)