Intermec EasyCoder 501 – Service Manual Ed. 7
134
Chapter 17 CPU Board
17.6:2 A/D and I/O Circuits
C12—C31
C9
6
5
4
3
2
RN5
7 8 9 10
VER3
VER2
VER1
VER0
JUM4
JUM3
JUM2
JUM1
28
27
26
25
24
23
22
21
20
19
PB7
PB6
PB5
PB4
PB3
NC
PB2
PB1
PB0
PC3
PC2
18
WR
A19'
A20'
A21'
A22'
A23'
7
6
5
4
3
2
RN9
1
+5V
8 9 10
A18'
A17'
A16'
VCC
30
D7
31
D6
32
D5
33
D4
34
NC
35
D3
36
D2
37
D1
38
D0
39
RESET
2
3
4
5
6
7
8
9
10
AD0-A15,A1-A20
AD–P24
AD–LSS
AD–VIN
AD–TEMP
AD–RES
C5
R18
R16
R15
R14
R13
RD
+5V
CSAD
WR
ADREADY
AD0
AD1
AD2
AD3
25
24
23
22
21
26
27
28
1
3
4
5
6
7
8
9
C6
C7
C8
GND
11
10
C4
12
GND
13
14
15
GND
AD7
17
AD6
18
19
20
AD5
AD4
R10
GND
10
9
8
7
6
5
RN6
4
32
RESET
39
RESET
D0
38
AD0
D1
37
AD1
D2
36
AD2
D3
35
AD3
NC
34
D4
33
AD4
D5
32
AD5
D6
31
AD6
D7
30
AD7
VCC
+5V
IC22
8255AM
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
WR
NC
40
41
42
43
44
1
2
3
4
5
HEADLIFT
RIB
–END
ADREADY
VIN
–OK
CUT
–IN
LABEL
RS
–OK
WR
LTS
RD
6
RD
CS
CS8255A
7
GND
GND
A1
A2
9
A0
A1
10
PC7
11
NC
12
PC6
13
PC5
14
PC4
15
PC0
16
PC1
17
CGDATA
CGSTROB
CGLATCH
PPWREN
CGCLK
CGENABLE
CGSTART
OR–ON
+5V
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
RESET
RN3
WR
IN2
IN1
ERROR
DATAIN
RS
–IDENT
DI
–IDENT
NC
WR
PA1
PA2
PA3
PA4
PA5
PA6
PA7
8255AM
IC23
PB0
PB1
PB2
NC
PB3
PB4
PB5
PB6
PB7
19
20
21
22
23
24
25
26
27
28
OUT1
OUT2
OUT3
OUT4
18
PC3
PC2
PC1
PC0
PC4
PC5
PC6
NC
PC7
A0
A1
GND
CS
PA0
RD
RD
V24-EN
EN-DOUBLE
EN-500
BEEPEN
CUT–OUT
5
4
3
2
1
44
43
42
41
40
17
16
15
14
13
12
11
10
A1
9 A2
GND
7 CS8255B
6
EN–ENG1
EN–ENG2
LIFT–HEAD
RD
AD8
AD6
AD4
AD2
AD0
AD12
AD10
RN7
AD14
AD11
AD1
AD3
AD5
AD7
AD9
AD15
AD13
RN8
9
8
7
6
5
4
3
2
10
1
+5V
9
8
7
6
5
4
3
2
1
+5V
10
1
+5V
1
+5V
1
+5V
RTC-72421
7
A4
6
A3
5
A2
4
A1
3
+5V
15
/RESET
2
CSRTC
10
WR
8
RD
IC20
18
VEE
VBB
1
STDP
14
AD4
D0
13
AD5
D1
12
AD6
D2
11
AD7
D3
A3
A2
A1
A0
ALE
CS1
CS0
WR
RD
DB0
DB1
DB2
DB3
NC
INTR
WR
CS
ADC0848M
NC
VCC
RD
IC21
CH1
CH2
CH3
CH4
CH5
NC
CH7
CH6
CH8
AGND
VREF
NC
GND
DB7
DB6
DB5
DB4
GND
+5V
GND
+5V
GND
VEE
C34—C39
C32—C33
+5V
AD-CHARGE
GND
GND
+5V
GND
R27
R28
R30
R32
R25
R29
R31
R33
GAL-IDENT
R23
1
2
Q4
3
GND
R26
R35
+5V
R24
+5V
P10