Carrier 42HWG009 Technical Data & Service Manual page 53

5) U6 (MAX 1232EPA): RESET I.C
PB RST 1
TD 2
MAX1232
TOL 3
GND 4
6) U7 (7812ACT)/U8 (7805CT): VOLTAGE REGULATOR
TSUFFIX
PLASTIC PACKAGE
CASE 221A
TO-220TYPE
1
2
3
PIN 1. INPUT
2. GND
3. OUTPUT
8 Vcc
7 ST
PB RST
6 RST
5 RST
100K
MAX1232
Vcc
5%/10%
+
TOL
TOLERANCE
-
SELECT
+
REF
DEBOUNCE
WATCHDOG
TD
TIMEBASE
SELECT
GND
SCHEMATIC DIAGRAM
100
100
500
3.3
K
6K
1.4
2.7
30pF
28K
K
K
500
6K
1K 5K
52
RST
RESET
GENERATOR
RST
ST
WATCHDOG
TIMER
INPUT
10K
240
200
0.3
OUTPUT
2K
0.19K
5K
GND