Main Pba - Samsung SCX-4720F Service Manual

4.3 Main PBA

The Engine Board and Controller Board have been integrated into a single PBA. This consists of the CPU,
printer scanner and line control functions. The CPU functions as the bus controller, I/O handler, motor driver
and PC inter-face. The main board sends the Current Image Video data to the LSU and manages the
Electrophotographic printing process. Circuits on the PBA drive include the main motor (paper feed,
cartridge, fuser), clutch driver, pre-transfer lamp driver, heat-lamp driver, CCD driver, scan motor driver,
modem and fan driver.
The signals from the paper feed jam sensor and paper empty sensor are inputted to the main board from
the power supply PBA..
1 1 IMAG E P RO CE SS OR(CIP4 E ) U 1 0 IMAG E P RO CE SS OR(CIP4 E ) U 1 0
2 2 P ROCE SSOR AS IC(S PGP m) U3 5 P ROCE SSOR AS IC(S PGP m) U3 5
FL ASH ME MORY FL ASH ME MORY
3 3
CODE - H IGH (2 9 LV1 6 0 DB) U2 3 CODE - H IGH (2 9 LV1 6 0 DB) U2 3
FL ASH ME MORY FL ASH ME MORY
4 4
CODE - LO W( 2 9L V1 6 0 DB) U 3 0 CODE - LO W( 2 9L V1 6 0 DB) U 3 0
FL ASH ME MORY FL ASH ME MORY
5 5
P CL 6 - HIGH (2 9 LV1 6 0 DB) U 2 4 P CL 6 - HIGH (2 9 LV1 6 0 DB) U 2 4
FL ASH ME MORY FL ASH ME MORY
6 6
P CL 6 - LOW(2 9 L V1 6 0 DB) U3 1 P CL 6 - LOW(2 9 L V1 6 0 DB) U3 1
7 7 SDRAM (K4 S2 8 1 6 3 2 E) U4 5 SDRAM (K4 S2 8 1 6 3 2 E) U4 5
8 8 SDRAM (K4 S2 8 1 6 3 2 E) U4 6 SDRAM (K4 S2 8 1 6 3 2 E) U4 6
9 9 MODEM(FM 3 3 6 ) U6 2 MODEM(FM 3 3 6 ) U6 2
1 0 1 0 SRAM (K6 R1 0 1 6 VID) U2 SRAM (K6 R1 0 1 6 VID) U2
Samsung Electronics
11
12
2
21
22
15
23 18
13
24
28
9
29
1 1 1 1 M OT OR DRIV ER(T E A3 7 1 8 S) U 5 M OT OR DRIV ER(T E A3 7 1 8 S) U 5
1 2 1 2 M OT OR DRIV ER(T E A3 7 1 8 S) U 9 M OT OR DRIV ER(T E A3 7 1 8 S) U 9
1 3 1 3 U SB 2 .0 (N ET 2 2 72 ) U5 0 U SB 2 .0 (N ET 2 2 72 ) U5 0
1 4 1 4 CMO S- LOG IC(7 4 H CT 2 7 3 ) U5 8 CMO S- LOG IC(7 4 H CT 2 7 3 ) U5 8
1 5 1 5 CMO S- LOG IC(7 4 H CT 2 7 3 ) U5 9 CMO S- LOG IC(7 4 H CT 2 7 3 ) U5 9
1 6 1 6 P ANAS ONIC(3 V) BAT 2 P ANAS ONIC(3 V) BAT 2
1 7 1 7 VA RT A (3 .6 V) BA T 1 VA RT A (3 .6 V) BA T 1
1 8 1 8 FP GA(E X6 4 - FT Q 6 4) U4 4 FP GA(E X6 4 - FT Q 6 4) U4 4
A/D CONVE RT E R(AF E- CIP 4 E) A/D CONVE RT E R(AF E- CIP 4 E)
1 9 1 9
U 3 U 3
2 0 2 0 U SB HOS T (T DO T G2 4 2 ) U 14 8 U SB HOS T (T DO T G2 4 2 ) U 14 8
10
19
16
1
3 5
20
4 6
25
26
27
8
7
17
14
15
LIN E T RAN SCE IV ER LIN E T RAN SCE IV ER
2 1 2 1
(7 4 LV X1 6 1 2 8 4 ) U 3 6 (7 4 LV X1 6 1 2 8 4 ) U 3 6
2 2 2 2 VE DIC X- T AL (1 9 .6 MH z) OS C3 VE DIC X- T AL (1 9 .6 MH z) OS C3
2 3 2 3 CPU X- T AL (1 2 MH z) OSC8 CPU X- T AL (1 2 MH z) OSC8
M ODEM X- T AL (2 8 .2 2 4 M Hz) M ODEM X- T AL (2 8 .2 2 4 M Hz)
2 4 2 4
OSC6 OSC6
2 5 2 5 U SB HOS T X- T AL (6 MH z) OSC9 U SB HOS T X- T AL (6 MH z) OSC9
2 6 2 6 P S3 DIMM CN1 0 P S3 DIMM CN1 0
2 7 2 7 RAM DIM M CN 1 2 RAM DIM M CN 1 2
2 8 2 8 J ACK U SB J1 J ACK U SB J1
2 9 2 9 J ACK DIN CN 1 7 J ACK DIN CN 1 7
3 0 3 0
Summary of Product
Service Manual
4-11