Wyse WY-60 Maintenance Manual page 42

Figure 3-1 Troubleshooting Flowchart, page 6 of 7
Fails Self-Test or Diagnostic Test, Continued
Error Code
a
Indication
Problems accessing
character RAM U7
Problems nccessing
attribute RAM uS
Recommended Actions
a. Check U1 , U5.
b. Chec k U7.
a. Check U1 , U5.
b. Check US.
9
Problems accessing
U2
a. Check Ul-2, -3.
b. Check power at
Look for +5V.
ground.
c. Check clock and
signals at U2-5
d. Replace U2.
U2-8.
U2-4 is
data
and U2-6.
A, C
E
K
p
p
W
x
y
z
MODEM port loop-back
error
AUX port loop-back
error, DSR-DTR
Nonvolatile RAM
error
External EPROM
error
Internal ROM error
Send error, MODEM
to AUX
MODEM port data error
AUX port data error
Send error, AUX to
MODEM
3-
11
a. Check signals DTR and
DCD for signal levels at
U3 (UART).
b. Check receivers and
transmitters U25 and u26.
c. Check X3.
a. Check Ul-4, Ul-5.
b. Check U27 and U2S.
~.
Turn the unit off.
b. While pressing the SETUP
key, turn the power on.
Continue to press the
SETUP key until the
screen flashes.
Replace U6 with appropriate
part.
Replace U1.
Check U28, U26, X3l, and U3.
Check U25, U26, U3.
Check U28, U27.
Cher:;k U25, U27, X3, and U3.