316
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 34 - DIAGNOSTICS AND TROUBLESHOOTING
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
BIT PATTERNS TEST SCREEN
00338VIP
FIGURE 113 -
BIT PATTERNS TEST SCREEN
TROUBLESHOOTING
If any of the tests from the previous screen do not per-
form correctly as described, perform the applicable pro-
cedure below:
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 configured cor-
rectly or for the installed Display or the microboard is
defective.
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 Interface
Board, Microboard or Display could be defective. To
locate the defective component perform tests in the fol-
lowing 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 defective.
3.
Microboard
a. With the “All Red” test selected, the voltage
at Microboard J5-6 through J5-11 (Red driv-
ers bits 0 through 5), as measured to GND,
should be greater than 3.0 VDC. If not, the
microboard is defective.
b. With the “All Green” test selected, the volt-
age at Microboard J5-13 through J5-18
(Green drivers bits 0 through 5), as measured
to GND, should be greater than 3.0 VDC. If
not, the microboard is defective.
c. With the “All Blue” test selected, the volt-
age at Microboard J5-20 through J5-25 (Blue
drivers bits 0-5), as measured to Grid, should
be greater than 3.0 VDC. If not, the mi-
croboard is defective.