Welch Allyn Atlas Service Manual page 127

A
4
RecVdc
R9 TP9
10K
3
+5V
J1
CON24A
Vpp Rec-Supply-On
1 2
Rec-Motor-Step
3 4
+12V
5 6
Rec-Data-Latch Rec-Strobe
7 8
Rec-Clock Rec-Data
9 10
11 12
13 14
15 16
17 18
19 20
C12
21 22
.047uF
23 24
D D
A
2
+5V
11 10 u3-clk
U5E
R24 74HCT04
1.96K
D
D
+5V
5
+
7
6
-
U1B
A
MC34072
A
u1-7
1
+5V
9 8
U5D
74HCT04
D
A
B
Q2-b 1
Q2
MMBT3904L
R10
10K R7
A
84.5K
A
R12
10K
+5V
TP8
TP17
R6
10K
C11 R14
.047uF 10K
1
+12V
Q3
2N7002
A
C21
.047uF
A
C14
2200pF
A
+5V
C18
.047uF
TP24
D
U3
2 13 data-IO
ClkIn/Osc1/RB5 RB0
TP66
U3-3 3 12 clk
Clkout/Osc2/RB4 RB1
TP67
Vpp n24Von
4 11
Vpp/MCLR/RB3 RB2
TP68 U3-5
5 10
RC5/TOCK1 RC0
U3-6 6 9
RC4 RC1
7 8
RC3 RC2
PIC16C505
B
C
+24V Boost
(23.6 V nominal)
+12V
C4
TP10 +
1000uF
U2-fb
+ C6
1uF
A
C7
.01uF TP14
U2
A
UC3843A
3
A
VFB
U2-comp 1 R13
COMP
10
U2-Ref 14 10 1
VREF OUT
R15
TP19
147
U2-RT Q4-s
7 5
RT/CT ISENSE
TP21 C13
5600pF R17
0.1
A A
A
Q6-e
3 2
A
Q6 TP23 R19
MMBT3904L 3.16K
R22
4.22K
RecVdc
R11
5.11K
TP26 R33 D6
1.47K 27V
U3-10
D1
27V
U6
TP27 R34 ULN2065
1.47K u6-3
3 2
1B 1C
U3-9 u6-6 6 7
2B 2C
u6-11 11 9
3B 3C
u6-14
14 16
4B 4C
1
CLMP1
u6-clmp
8
CLMP2
R35
1.47K
U3-8
A
TP28
TP29 R36
1.47K
U3-7
C
D
+24V
L1 q1-g Printhead
22uH
On/Off Switch
R3
D2 10K
MBRS340T3
4
Q4-D 3 2
C8
+
Q1
1800uF R16
Q4 19.6K
MTP30P06V
MTP30N06VL
A
A
R18
no-load
A
3
+5V D
5 6
U5C
74HCT04
D
1
+24V
+5V
D
13 12
U5F
74HCT04
TP1
d6-c
D
C19
.047uF
A
J3
J3-1
1
2
J3-3
3
J3-4
4
5
J3-6
6
CON6
Initial
Drawn
Rick Myers
Designed
Rick Myers
Checked
L.Phillips
Approved
Z. Psenicnik
Release For Production
J. Bello
D
E
REV ECN/ECO Init
Description Date
A Release to Production 5-39179 JAC 3/18/99
+5V
Temperature
Amplifier
+5V
C1
.047uF
R1
51.1K
TP3
A
R2
U1-3 1K
3
+
1
Rec-Temp
C2 U1-2
2
-
R4 .01uF U1A
9.09K MC34072
TP54
A A TP6
U1-1
A
C3
R5 .01uF
1K
R8 23.7K
C5 .01uF
+5V
Thermistor
Input
D3
BAV99L
3
A
Printhead
Connector
+24V-switch
J2
1
+5V 2
Thermistor1
3
Thermistor2
4
Strobe
4
5
6
U5B
7
+5V
74HCT04
8
9
10
Strobe
11
Latch
12
Clock
13
Data
+5V 14
15
16
2 C10
.1uF
CON16
U5A
74HCT04
A A
+24V
+
C20
47uF Connector Pin #
1 3 4 6
A
phase 1 + +
2 + +
3 + +
4 + +
Welch Allyn Inc.
Date
Schematic: 620014.dsn
Mar 5, 1999
Mar 5, 1999
Title
Printer Electronics
3/22/99
Size Document Number
3/19/99
620014
C
3/19/99
Date: Monday, March 22, 1999 Sheet 1 of 1
E
Ckd
LPP
4
3
2
1
Rev
A