AT&T Bell System 7A Manual page 5

FUSE FUSE AMP
DESIG (TYPE)
Fl
F2
F3
1-1/3(70A)
F4
F5
F6
F7
F8 l/2(70G)
F9
1-1/3(70A)
FlO
Fll 1/2(70G)
F12 3/4(70H)
F13
1-1/3(70A)
F14
POWER UNITS-19C2119C2A/19C3
FUSE DESIG
Line Fl
±18V ac (19C2
and 19C2A only)
±lOVac
±lOV ac
24V deB SIG
24V de A TLK
18V ac (3)
-24A
-24B
Early production models of the 570A KSUs were equipped with 16 fuses.
Note:
Fuses 15 and 16 were used for music-on-hold.
TABLE A
FUSE A R RANGEMENT -570A KSU
FUSE PANEL (SEE FIG.
POTENTIAL
First CO/PBX Line Lamps
Second CO/PBX Line Lamps
Third CO/PBX Line Lamps
lOVac
Fourth CO/PBX Line Lamps
Fifth CO/PBX Line Lamps
Sixth CO/PBX Line Lamps
Seventh CO/PBX Line Lamps
Interrupter Motor
-24V dc(SIG) System Privacy and DSS Console
Night Transfer and MW Console
lOVac
Paging Amplifier
-24V dc(SIG)
C Battery
First Intercom Path Lamp
lOVac
Second Intercom Path Lamp
FUSE AMP
(TYPE)
2(MDL-2)
AC Input Power
2(24C)
Console Lamp Supply
Lamp and Lamp Flash
5(24F)
Lamp Wink
3(24B) B (Signal) Battery
2(24C) A (Talk) Battery
215Cl (USED WITH 19C3 PU)
Console Lamp Supply
2(24C)
VOLTAGE RANGES
ISS 3, SECTION 5 1 8-450- 1 00
6)
FUNCTION
FUNCTION
18-26 (19C2, 19C2A)
18-27 (19C3)
20-26 (19C2, 19C2A)
20-27 (19C3)
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