Nellcor OxiMax N-550 Service Manual page 126

TP4
T POINT M6
LM78L05A/TO-92
3
Power OUT VIN
C4
1uF
3216
U4
1
A0 VCC
2
A1 WP
3
A2 SCL
4
VSS SDA
24LC256/SOIC
U5
1
A0 VCC
2
A1 WP
3
A2 SCL
4
VSS SDA
24LC256/SOIC
U6
1
A0 VCC
2
A1 WP
3
A2 SCL
4
VSS SDA
24LC256/SOIC
U18
1
A0 VCC
2
A1 WP
3
A2 SCL
4
VSS SDA
24LC256/SOIC
Serial EEPROM
TP3
T POINT M6
XTAL2 U22
32.768kHz
1
X1
2
X2 SQW/OUT
3
VBAT SCL
4
GND SDA
BT1
DS1307
3V LITHIUM
N-550
TP5
U3
T POINT M6 +5VA
1
VOUT
C5 D3
1uF B140
RA1
TP6
+5V
T POINT M6
L26
R7
8 C79
0.56uH
R6
2K 0.1uF
2012
7 2K
6
5 C7
47pF
+5V XTAL1
32MHz
C6
R40
47pF RA1
8
2K
+5VA
7 R41
2K
6
5
+5V
R42
8 2K
7 R43
2K
6
5
+5V
R44
8
2K TP1
T POINT M6
7 R45
2K
6
SCL
5
SDA
TP2
T POINT M6
+5V
R4
2k
8
Vcc
R5
7
2k
6
5
+5VA
+5VA
+5V
D4
C71 C72 C75
C73 C74 C76 C77 C78
B140
2.2nF 2.2nF 2.2nF 2.2nF 10nF 10nF 10nF 10nF
U1
51
OSC2
45
TP11
SCL
RA2/SS
46
SDA
RA3/SDI/SDA T POINT M6
43
RA4/RX1/DT1 RX1
42
RA5/TX1/CK1 TX1
59
RB0 R24
RB0/CAP1
58
RB1 100
RB1/CAP2
54
RB2
RB2/PWM1
57
RB3
RB3/PWM2
56
RB4
RB4/TCLK12
55
RB5
RB5/TCLK3
47
RB6/SCK
48
Nurse Call 1
RB7/SDO
3
RC0/AD0 RC0
67
RC1/AD1 RC1
66
RC2
RC2/AD2
65
RC3
RC3/AD3
64
RC4/AD4 RC4
63
RC5/AD5 RC5
62
RC6/AD6 RC6
16 61
RC7
MCLR/Vpp RC7/AD7
17
TEST
50 11
OSC1 RD0/AD8 RD0
10
RD1/AD9 RD1
60 9
RA0/INT RD2/AD10 RD2
44 8
RD3
RA1/TOCKI RD3/AD11
7
RD4
RD4/AD12
29 6
AVss RD5/AD13 RD5
30 5
AVDD RD6/AD14 RD6
4
RD7/AD15 RD7
12
RE0
RE0/ALE
13
RE1
RE1/OE
14
RE2/WR RE2
15
RE3/CAP4 RE3
28
RF0
RF0/AN4 R22
27
RF1
RF1/AN5 26.7K_F
26
RF2/AN6 RF2
25
RF3/AN7 RF3
24
RF4/AN8
23
RF5/AN9
22
TX422EN
RF6/AN10
21
R23
RF7/AN11 Alarm SW
6.2K_F
34
RG0/AN0 RG0
33
Nurse Call 2
RG1/AN1
32
RG2/AN2/VREF-
31
RG3/AN3/VREF+
38
RG4/CAP3 anteld
39
RG5/PWM3 POWER ON
41
RX2
RG6/RX2/DT2
40
TX2
RG7/TX2/CK2
PIC17C756/PLCC
Main Control Unit
+5V
Q18
2N2222A
J4
CON2
U15
12
RD0
ID0
+5V
11
RD1 ID1
13
RD2 ID2
R3 14
RD3
ID3
10K
10
TP8 RD4 ID4 (!SHUTDOWN)
1
T POINT M6
6
RD5
ID5 (!DECODE)
RT1
5
RD6 ID6 (HEXA/!CODE B)
10k
7
RD7 ID7 (DATA COMING)
t
8
INPUT_V
RC0 !WRITE
9
RC1
MODE
TP7
1
T POINT M6
ICM7228AIPI
Single ICM7228 Driver
Storage Control Schematic Diagram
Technical Discussion
+5VB
C61
C26
47uF
0.1uF
16VEL
19
VDD
27
SEG a SEG a
3
SEG b SEG b
1
SEG c
SEG c
25
SEG d SEG d
2
SEG e
SEG e
24
SEG f SEG f
26
SEG g SEG g
4
DP
DP
15
DIGIT 1 DIGIT 1
16
DIGIT 2
DIGIT 2
23
DIGIT 3 DIGIT 3
20
DIGIT 4
DIGIT 4
17
DIGIT 5 DIGIT 5
22
DIGIT 6 DIGIT 6
21
DIGIT 7
DIGIT 7
18
DIGIT 8 DIGIT 8
28
VSS
Figure 52: Main PCB MCU and
121