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REV #

DATE 7/17/91

REVISION

NOTES: 1) ALL DIODES 1N4148

J2
1

ALARM DISABLE TEST/ALARM DISABLE RETURN +12
14 10 2 8

+12 7 ECO #391 AND ECO #394 R138 WAS 33K IS NOW 24.9K, C44 WAS .1uF IS NOW .22uF TO MAKE CURRENT LIMIT CIRCUIT WORK WITH STABLE +12. ECO #412 AND ECO #413 NO CHANGES ON THIS SHEET ECO #415 NO CHANGES ON THIS SHEET 3 8,9 8/30/91 R44 100K

715-0007

J2
IC5 350-4011 CD4011

1

R128 2
9 1

SWITCH CLOSED = BEEPER DELAY C29 10 9/6/91
2 1

1

8

SW1 550-0001

C14 .01uF +12
1 14 4 1 1 2 5 74C14 350-7414 14 2 1 2

.1uF IC3 R45 +12 R133 12UNFILT
6
2

ACFAIL
2

100K
1 IC5 350-4011 CD4011

1

D20
2

+12
1

C15 .1uF
2

1

D15
2 2 BZ1

470K C48 .01uF D35
1

2 715-0007

4.7K

ALARMOSC CLAMP +12

2

390-0004 BEEPER 2 3 1 3
2

+12 +12
8 10
1

R74 150K
1 14

SHUTDOWN
3

D30
2 1 2 1 1

D31 R138 24.9K
1

6 9
1 1

R134 2M

14 2 13

IC3
12
2

D39
1

IC2
1 2 1

C26
2 7 12 CD4001 350-4001 1

IC4
D22 +12
14 13
2 2

1

Q9 PN2222
2

COMP
74C14 350-7414 1

LOW BAT WARNING OPEN = 2 MIN CLOSED = 5 MIN
+ LM339AN

2

2

12UNFILT IC10
12
2

+5

4 5 SW1 550-0001

.01uF R115 100K

D46

D18

Q29 PN2907

C44 .22uF
2 2 1

R70 6.81K
74C14 350-7414 1 1 2 2 1

2

1

2

R68 10.0K 133K 1M
1 2

R130 10.0K DELETE ON 250 R73
2

R47 6.8M D17
1
2 1

R64 R131 30.1K
1 1

R135 1M R137 1M
2

2

1

2

ACFAIL R46
1

1

2

33.2K C16 1uF
2

1

R72 34.8K +12

C25

22uF +5
11

R129 2.26K

CHANGE TO 24.9K
3 2

2

1

1

INVDISBL

2

Q11 PN2907

2

ON 250
Q12 1 PN2222

3

R69 6.81K

1

2

R71 33K

1

14 VDD 10 IC6 12 CD4066 350-4066

DELETE ON 250

ALARMOSC +12

723-0001

2

CC LOW BATTERY
5

J14
12UNFILT
723-0001 1

+12
2

R114 20K +12 +12

1

14

IC10 R106 200K
1 1 1 2

14

IC10

R139

1

2

3

4

2 2 3 2

3

6

J14
20K R140 2 1 Q24 PN2907
3

OC AC FAIL Q33 PN2222 200K
1

74C14 350-7414

74C14 350-7414

1

R108
2

R107 200K
1

1 723-0001 3

2

+12 R141 680K 12UNFILT R143 2 1
1

14

IC10

1

30.1K

5

6

Q32 PN2222
2 1 3 2 2 3

J14
R105 47K 2
723-0001 4 2 1 2

CC AC FAIL

74C14 350-7414

C41 .01uF

+12

Q27 PN2222 R104 47K

R103 1 20K

Q28 PN2222
1

J14
723-0001 2

DB-9 GROUND

14

IC10

2

9

8

J14
1 2 1 723-0001 1 3
1

74C14 350-7414

R113
2

RS-232 AC FAIL

+12 47K

20K

14

IC10

11

10

Q25 PN2907 R101
1

J14
723-0001 2 9

UPS SHUTDOWN

74C14 350-7414

ACFAIL D32
1
2

J14
R102 1.00K 2
1

DB-9 GROUND 20ohm

SHUTDOWN
1
2

C42
2
1

2

D33
2

Q26 PN2907
1 2 3

AMERICAN POWER CONVERSION
DESCRIPTION SHEET R109 20K

3

2

R110 2 1 22uF D34
1

Q23 PN2222

2

C43
22uF
2

1

100K

SB208 CIRCUIT BOARD SCHEMATIC
PRODUCT
1

B
APCC PART #

R111 100K

1

250/400/600 INT'L BACK-UPS
DATE BY SCALE

0S-208
DWG REV

3/22/91

ESM

E208-10

10