IBM 3277 Troubleshooting Manual page 32

Sheet ~
e Chonge fUM.
e Turn power on.
Check cables from PC
board
to
C/TB I ond
from PC board
to
fefTO ~onsformer.
No
e Repoirfoult.
e Check
out
unit for pc-oper
operotion.
Yes
No
Yes
e Remove CRT socket and
cone shield
(5.3.3.2).
e Connect CRT socket.
e Turn power on.
Chonge vol toge
distribution board
!Diog. 7-6\.
No
e
Turn power oH.
e Remove CRT socket.
e Measure resistance
between CRT
pins I ond '4.
Chonge ferro transforMer
(Mod I,
5.3.2.6,
5.3.2.7;
Mod 2,5.3.2.8,
5.3.2.9).
Diagram 4-1. Display Station Troubleshooting Diagrams (Sheet 3 of 29)
Sheet
~
e Turn power off.
e
Remove
CRT sock.t ond
cone shield (5.3.3.2).
e Connect CRT
socket.
e Tum power aH.
e Remove CRT socket.
e Measure r .. istance
between CRT
piN
I
ond
14.
Check cobl .. ond
CRT ,ocket for l _
or broken connections.
Yes
e Turn power off.
e Reploce cone shield.
e Chonge onalog cord
(Mod
I, 5.3.3.3;
Mod 2, 5.3.3.~).
e Power on ond odJust
(5.2.1).
Troubleshooting Di8gqms 4-6