Reader Checks (Off Line) - IBM 1620 Manual

\If
Check
Trans Accu Circuitry
1) Read Trans Accu
Latch Circu itry
2) CB's
3) C lock Rings
1622 Off Line Section
Reader Checks
Read Error
VRC, No
NoVRC
Read Error
Read Error
and VRC
B2 Light
A2 Light
\
A2 and B2 Light
I
\
I
\If
with Card
r\
SCR Agrees
No
,II
\
Check
First Read Circuitry
Check
Second Read C i rc u i try
t
T
1) Brush Condition, Timing
and Tracking
2) Contact Roll
3) Card Lever Contact and
Relay
4) CB's
5) Card Transport
6) Common Brush Circuit
7) Row Bit Cores and
Register Circuitry
3. 17
\11
Check
1) Read Buffer Circuitry
a. 'SCR Latches
b. Buffer Read and
Write Circuitry
c. Core Planes
2) Card Code to BCD
Translator Circuitry
3) RBR-2 Latch