Chapter 6. Circuit Schematics And Parts Layout; Control Pwb Circuit - Sharp FO 4400 - B/W Laser - All-in-One Service Manual

FO-4400U
FO-CS1

CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS LAYOUT

A
[1] Main Control PWB circuit
CPU block
SHADG
6
LCDTH
( 9-2E)
5
MEMDTCT0 R351
(12-5E)
MEMDTCT1
(12-5E)
PCLDTCT
R291
(10-3I)
NICDTCT
R289
(10-6E)
R286
L101
R256
+3.3V
0 (1608/2125)
4
4
VDD
C220
0.1u
2
GND
33.1776MHz
DG
3
+1.9VD Vcc-PLL
R454
0
2
CE11
22u/16V
R361
0
DG VSS-PLL
+3.3V +3.3VSHA
R300 0
1
C245
0.1u
R302 0
DG SHADG
A
B
+3.3VSHA
(11-5E)
(11-5E)
(11-5E)
R299
(11-5E)
20K
(11-5E)
(11-5H)
D6
(11-5H)
(11-5E)
N.M.(MC2850)
(11-5H)
(11-5H)
(11-5H)
(11-5H)
(11-5E)
+3.3V
( 2-3A)
( 2-3A)
( 2-3A)
( 2-3A)
( 2-3A)
( 2-4A)
0
( 8-3H)
N.M.
(11-3I)
DG
(11-3I)
10K
OSC1
1
OE
13
R29 10
3 24
OUT
11
14
+3.3V
10
15
22
C222 C225 C224 C223
N.M.
18
19
DG
( 2-3A)( 3-1A)( 4-4A) /RESET
( 7-3B)( 8-4H)(11-5H)
IC16A
74LV14A
( 4-2A)
TCS1
R261
10K
(4-4A)
TCS2
R258
N.M.
/ICERESOUT
(11-3A)
MANRES
( 2-3A)
B
C274
C275
C276
DG C277
C242
AUDATA0
AUDATA1
N.M.
AUDATA2
AUDATA3
/AUDSYNC
TDO
/ASEBRKAK
/ASEMD0
TDI
TCK
TMS
/TRST
AUDCK
/IRL0
/IRL1
/IRL2
/IRL3
/DREQ0
/DREQ1
R298 100
LCDVECNT
TXD
+3.3V
RXD
N.M.
IC15
12
FBIN FBOUT
R20 22
3
CLK 1Y0
R21 22
4
1Y1
5
1G 1Y2
8
R22
N.M.
2G 1Y3
9
1Y4
R28 22
2 21
VCC 2Y0
R30 22
20
VCC 2Y1
17
VCC 2Y2
16 R31
VCC 2Y3
R32
N.M.
23 R257
AVCC
6
GND
7
GND C221
N.M.
GND
1
GND AGND
DG
N.M.(CDC2509CPWR)
(11-3D)
+3.3V C246 +3.3V
2200p
DG IC16B
2 1 4
74LV14A
+3.3V
DG DG
R260
Q111
0
KRA102S
+3.3V
DG
R259
Q110
N.M.
DG
R304
4.7K
DG
6 – 1
C
C219
C218
C217
C235
N.M.
C244
N.M.
R293
+3.3V
4.7K
SHADG
N.M.
R359
R350
C241
R358 4.7K
R354 4.7K
4.7K
R333
DG
4.7K
R353
CKSPDR ( 3-1A)
CKCSMS ( 2-3A)
CKLCDC ( 7-3B)
CKSDRL
( 4-2D)
CKSDRU ( 4-5D)
(11-2D)
CKICE
DG
+3.3V
+3.3V
R296
10K
NMI
C243
N.M.
DG
+3.3V +5V
C248 1u
R262 IC17
1K
5 1
VCC M/R
2
SUB
3 4 3
VOUT GND
PST596
DG
TP505
<RESOUT>
C
D
R303
DG
+1.9VD
4.7K
R335 100
R336 0
+3.3V R301 10K
R295 10K
TP2
R50 10K
R51 10K
TP3
TP1
SHADG
R292
0
TP5
+3.3V R332 4.7K
R294 4.7K
R297 10K
+3.3V
C17 1u/6.3V
C21 1u/6.3V
C20 1u/6.3V
C25 1u/6.3V
C24 1u/6.3V
C22 1u/6.3V
C19 1u/6.3V
C238 1u
C11
1u/6.3V
+1.9VD
DG C16 1u/6.3V
C23 1u/6.3V
C13 1u/6.3V
C10
1u/6.3V
Vcc-PLL
1u/6.3V
DG C14
C236 470p
1u/6.3V
C15
TP15
+3.3VSHA
Vss-PLL
1u/6.3V
C12
SHADG
D