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REV # 7 7/17/91 12FUSED XFMR LV CT BATT+ POWER SWITCH POWER SWITCH BATTECO #391 AND ECO #394 REPLACED R75 WITH D47 SO +12 IS NOT DRAGGED DOWN BY BATTERY SUPPLY WHILE C27 DISCHARGES RAPIDLY AT WHEN UNIT IS TURNED OFF. THIS PREVENTS UV LOCKOUT ON IC7, WHICH CAUSES IT TO PUT OUT DC.

DATE

REVISION

NOTES: J1
8,9 8/30/91
1 701-0059

1) ALL DIODES 1N4148 UNLESS MARKED

J15 J11
1 1
701-0059

J3
1

J1
721-0003

J4

2

1

721-0003

UTIL_HOT

ACOUTWHT

600 ONLY

ECO #412 AND ECO #413 Q10 BSS100'S HAD STATIC PROBLEMS ON ASSEMBLY LINE. Q10A BUZ71 IS USED INSTEAD.

513-0001 F2 1A MINI F1
2

10

9/6/91

FUS40

513-0001

F3 1A MINI
1 2

2 512-0005 30A PIGTAIL
2

1

1

FUS40
365-317T(W/HS) 1 LM317HS 2
1 2 2

ECO #415 ADDED C49=.01uF TO PREVENT IC7 "HICCUP" DUE TO NOISE ON +5 DURING RELAY SWITCHING.

IC1
D8 1N4005 1 2 512-0005 30A PIGTAIL F4 1 12UNFILT

3

1N4005
1

D4 D5 R9
2
1 1

1N4005 C4 .1uF
1 2

C3 330uF R10
2 1

237 ohm
1

2

2

600 ONLY
VR1
3

2

2

1

ACFUSED 50K D6 D7
1 1

20K 1N4005 R11 2.67K
2

ACFAIL ACFAIL 1N4005 +12
2

1N4005

430-0006

D47

1

ACOUTBLK A 1 INV_HOT UTIL_HOT

1

+5 +5
2 450-0011

C27
+12 22uF

+12
1

1

2B 5 NO 4 NC

+12
1

COM 3 RY1

1 2 10 2 1 3 4 14 14 9 74C14 350-7414 8 5 + LM339AN 12 2 1 1 1 74C14 350-7414

R51
2

2

3

R55 10K 1 Q10A BUZ71
1 3 13 LM339AN

R57 49.9K +12 +12 BSS100 IS NOT USED
2

R62 6.8M IC3
10

IFDFWRD COMP
1 2

1

1

R56 1
2

200K
11 + 12

IC4
150K 3 D48 C20 .022uF C22 .1uF
2

IC3

R38 49.9K R39 43.2K
1

2

C17 3.3nF +12 R122 261K C23
2 1 2 2 3

R52 200K

IC4

2

2

2

2

11

Q10 2

+5

C49 .01uF
1

+12
2

+12 +12
1

1 +5
8 -

1

TEST 12UNFILT
1 1 9 + LM339AN 12

1

R53

2

2

J2
IC4
XFER1 R63 20ohm
2 14

R123 133K
2

+5

715-0007

R27 20K
2 1

2

R28 20K R25 150K 15
2 2 1 1

1

200K XFER2 R22
1

C18 3.3nF

R54 200K
SW1 550-0001 7 2 SW1 550-0001 6 3

+5

R23 604K
1

16 2 1M
2 2

2

2

VR3
2

C19 .01uF +12 +5
3

13 1 R24 100K
1

XFER VOLTS
2

50K

XFER1 196V OPEN
1 2 1 2

XFER2 OPEN OPEN CLOSED CLOSED 200K .1uF
1

OUTPUT VOLTS

1

1

R61 10M C21
1 2

C9 .1uF
2

R26 150K

14 9 3 6 C10 .01uF
1 1

12 11 10 7 4 ISENSE 8
2

186V CLOSED OPEN CLOSED 50K XFER 2 3VOLTS R59
1 1 2

330K R60

176V 166V

VR2

+VIN VREF COL_B NON_INV EMIT_B INV IC7 COL_A COMP EMIT_A OSC_OUT SHUTDOWN RT +CL CT GND -CL
C8 .1uF SG3524BN 360-3524B 5

1

.001uF

1

D45 R126
1

2

R58 133K
2

2

2

+5

66.5K D9

CHANGE R126, R127 TO 178k ON BACK-UPS 250
1

C45 .0033uF R18 R19
2

+12
1

ACTRIP 4.7K
1 8

R17

2 2

1 1

2 2

200K

1

470K
1

2

R15
2

14 VDD

D44 C7 .22uF
2

2

+5
1 2

R20 470K
1

R21 178K

100K +12

VR4
50K
1

1

66.5K
3

+12 +12 IC3
6 4 74C14 350-7414 1 14 VDD

+12

C46 .0033uF
2

R14
14 2 3 74C14 350-7414 4 5 14

C5 IC3 R16
2 1

R12 1M

1

2

13 11

2

100K R13 1M
2

1

1

CD4011 350-4011 IC5

C6 .1uF

.1uF

100K

3 IC6 5 CD4066 350-4066

+12

12 14

2

AMERICAN POWER CONVERSION
2 3 1 CD4011 350-4011 IC5

DESCRIPTION +12
14

SHEET

1

9 IC6 6 CD4066 350-4066

1

R127

2

1

PUSHPL1

PUSHPL2

SB208 CIRCUIT BOARD SCHEMATIC
PRODUCT APCC PART #

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

0S-208
DWG REV

3/22/91

ESM

E208-10

10