IBM 3277 Troubleshooting Manual page 52

• Model 1-Remove left
side cover.
• Model 2-Remove front
cover.
• Unplug lin. cord from
power source.
• Pull OFF -PULL switch.
e Set ohmmeter on X 1
range.
• Mealure resistance
across line cord plug.
No
ug 2-wire
connector
P2
on bock
of pri mary pow.r bal(.
• Measure resistonce
ocross pi ns of pi ug
removed.
Ves
Ves
• Ohmmeter on X 1 range.
Yes
Change ferro transformer
(Mod 1, 5.3.2.6,
5.3.2.7
Mod 2,5.3.2.8
5.3.2.
Sheet 2
e Turn power off.
• Change analog cord.
(Mod 1,5.3.3.3
Mod 2, 5.3.3.4)
• Power on and adiust.
(5.2.1)
• Turn power off.
e Remove plugs P2
and P4 from prime
pow.r bOl(o
e Change fuse F 1 •
• Tum pow.r on.
Ves
e Change, in following
order:
1. PC board
(5.3.2.1).
2. AC capacitor
(5.3.2.3),
3. Ferro transformer
(Mod 1,5.3.2.6,
5.3.2.7)
Mod 2,5.3.2.8,
5.3.2.9)
• Check for repair ofter
each unit installed.
• Ch.ck prime power bOl( and connectors.
Change line cord.
• Change prime powerbox
(Mod 1, 5.3.2.4
Mod 2,5.3.2.5) if no shorts or. evident.
• Change fuse Fl.
• Reconn.ct all conn.ctors.
Diagram 4-1. DispilY Stltion Troubleshooting Dillll'llmi (Sheet 23 of 29)
Ves
No
• Turn power off.
• Reconn.ct plug P2.
• Change fuse Fl.
• Turn power on.
• Turn power off.
• Reconnect plug P4.
• Remove plug P1 from
PC
board.
• Change fuse Fl.
No
No
• Change ferro transformer
(Mod
1,
5.3.2.6,
5.3.2.7
Mod 2,5.3.2.8,
5.3.2.9).
• Change fuse Fl.
• Reconnect all connectors.
• Ch.ck cord reader and
connectors.
• Change cord reader if
no shorts are evident.
• Reconnect all connectors.
Sheet 25
Troubl ..... ooting Diagrams 4-26