Fig. 68 - Bit Patterns Test Screen - York MAXE OPTIVIEW YK Service Instructions Manual

Diagnostics & Trou ble shoot ing
FIG. 68 – BIT PATTERNS TEST SCREEN
TROUBLESHOOTING
If any of the above tests do not perform correctly as de-
scribed above, perform the applicable procedure be low:
Test Failed:
Bit Patterns - If the vertical bars are not straight or
if the red border is not completely visible, either the
Microboard Program Jumpers are not con fi g ured cor-
rect ly or for the installed Display or the Microboard is
de fec tive.
All Red, All Green, All Blue, All White or All
Black:
If these tests do not produce appropriate solid color
screens, the Display Ribbon Cable, Display In ter face
Board, Microboard or Display could be de fec tive. To
locate the defective component perform tests in the
fol low ing order:
1. Display Ribbon Cable:
Using an Ohmmeter, perform a continuity test on
all conductors in the ribbon cable. An open circuit
would indicate the ribbon cable is defective.
2. Display Interface Board:
Using an Ohmmeter, perform a continuity test on all
conductors of the Interface Board. An open cir cuit
would indicate the Interface Board is de fec tive.
156
3. Microboard:
a. With the "All Red" test selected, the voltage at
Microboard J5-6 through J5-11 (Red drivers bits
0-5), as measured to Gnd, should be > 3.0VDC. If
not, the Microboard is defective.
b. With the "All Green" test selected, the voltage
at Microboard J5-13 through J5-18 (Green driv ers
bits 0-5), as measured to Gnd, should be >3.0VDC.
If not, the Microboard is defective.
c. With the "All Blue" test selected, the voltage at
Microboard J5-20 through J5-25 (Blue drivers bits
0-5), as measured to Grid, should be >3.0VDC. If
not, the Microboard is defective.
d. With the "All White" test selected, the voltage
at Microboard J5-6 through J5-11, J5-13 through
J5-18 and J5-20 through J5-25 should be >3.0VDC.
If not, the Microboard is defective.
e. With the "All Black" test selected, the voltage
at Microboard J5-6 through J5-1 1, J5-13 Board.
An through J5-18 and J5-20 through J25 should be
<1.0VDC. If not, the Microboard is defective.
4. Display:
If the Display Ribbon Cable, Display Interface
Board and Microboard check OK per the above
procedures, the Display is most likely the cause of
the problem.
FORM 160.54-M1(503)
00338VIP
YORK INTERNATIONAL