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Technical Supplement
TO N-20 AUX BOARD
JP9
VPRN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PWR_ON
17
18
PR_PRESENT
19
20
21
22
22 HDR
User control is provided by momentary push buttons: ON (on/off), ADV (advance), and D/D
(day/date). ON enables or disables the printer, ADV controls the advance of printer paper, and D/D
sets date, time, and other clock parameters.
When a low battery voltage condition is present, the N-20 adjusts power to the printer's head;
however, a weak battery voltage condition causes the printer to shut off, thereby allowing the N-20P
to continue to display oxygen saturation and pulse rate readings until the batteries are exhausted. An
ambient temperature sensor adjusts printout quality to compensate for environmental conditions.
9.10.22 Printer Interface Circuit
The printer interface circuit is illustrated in Figure 9-31, at the end of this section.
9-28
TG
HM
DOT4
8
PR_DOT6
1
2
PR_DOT5
3
4
PR_DOT4
5
6
PR_DOT3
7
PR_DOT2
10
PR_DOT1
PR_DOT0
PR_MOTOR
3300UF
Q1
1
S1
2
G1
3
S2
4
G2
SI9956DY
ON_OFF
ADV
DD
Figure 9-32: Printer Flex Circuit
SEIKO
MTP102-16
PRINTER
U1
11
INM
OUTM
18
IN0
OUT0
17
IN1
OUT1
16
IN2
OUT2
15
IN3
OUT3
14
IN4
OUT4
13
IN5
OUT5
12
IN6
OUT6
9
VCC
GND
LB1256
C3
8
D1
R1
7
D1
1K
6
D2
C4
5
D2
0.01uF
R2
1K
C5
0.01uF
R3
1K
C6
0.01uF
JP10
M+
1
M-
2
TG
3
4
HM
5
6
HEADER 6
JP11
8
DOT6
DOT6
7
DOT5
6
DOT4
5
DOT3
4
DOT2
3
DOT1
2
DOT0
1
HEADER 8
ON OFF BUTTON
S1
ADVANCE BUTTON
S2
DAY/DATE BUTTON
S3
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