Reset Circuit; Cdcc I/O - Brother HL-600 Service Manual

1.3.7 EEPROM
The EEPROM is X24CO1A type of a two-wire method with a 128 x 8 bit configuration.
1.3.8

Reset circuit

The reset IC is PST593DMT.
The reset voltage is 4.2 V (typ.) and the LOW period of reset is 200 ms (typ.).
1.3.9

CDCC I/O

Fig. 2.12 shows the CDCC interface circuit.
+5V
RA2 RA4
1K
5 7 3 8 7 8 6 5
2 6 1
4 2 1 3
P4 CDCC
10
ACK
11
BUSY
12
PE
13
SELECT
32
FLT
31
INPRIM
36
SELIN
14
ATFEED
1
STB
9
DI8
8
DI7
7
DI6
6
DI5
5
DI4
4
DI3
3
DI2
2
DI1
16
0V
17
0V
19
0V
20
0V
21
0V
22
0V
23
0V
24
0V
25
0V
26
0V
27
0V
28
0V
29
0V
30 0V
0V
18
+5V
+5V
#6
XL24C01AF
6
( -05E) SCL
SDA SDA
1
A0
VCC
2
A1
VSS
3
A2
TEST
Fig. 2.10
#7
PST593DMT
3
1
VCC OUT
2 NC
4
CND MR
0V
Fig. 2.11
RA6
1K
1K
7 8 6 5
4 2 1 3 4
RA1
100
5 4
7
2
3
6
1 8
RA3
100
8 1
2
7
6
3
5
4
1
8
7
2
6
3
5
4
RAS 100
0V
C47
101 X12
Fig. 2.12
+5V
R20
4.7K
5
SDA ( -05D)
8
+5V
4
0V
7
C31
104
+5V
R22
1K RESET ( -01E)
C30
102
101 X5
C52 C51
C48 C37
C53
C45
C41 C36 C38 C43 C44
C49 C50
C42 C54 C39
II - 9
0V
ACK (01-05B)
BUSY (01-05B)
PE (01-05B)
SLCT (01-05B)
FLT (01-05B)
PRMINT (01-04A)
SELIN (01-04A)
HBUSY (01-04A)
STB (01-04A)
DC18
DC17
DC16
DC15
DC14
DC13
DC12
DC11
DCI(8..1) (01-03C)