This page describes the IBM SMS card "YGB", and is part of the SMS card database.

Function of the card:
Overvoltage Protection 12 Volt
Power supply 12v overvoltage

Crowbar

Part number:370576

Field replacement part number:370574

PCB number:484337

Used in:IBM 1620,IBM 1401

Symbol:OV

Transistor type:026 086

References:
1_2 SMS Cards, p8,10,11.

Pinout:

A NEG
B NEG
C NEG
D NEG
E NEG
F NEG
G NEG
H POS
J POS
K POS
L POS
M POS
N POS
P POS
Q
R BIAS

This page created by Ken Shirriff, 2015.

The information on these pages comes from a variety of sources, especially old IBM documents on bitsavers.org, as well as information from the IBM 1401 restoration team, especially Tim Coslet's SMS data and Jim Hunt's data. Images courtesy of Randall Neff. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.

Creation time: Tue Mar 03 23:40:34 2015.