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5.
5. Service Test Program-Display Test
To start service test program
select AUX source. Press
2-5-8. All 3 numbers must be
keyed in within 5 seconds.
Display shows
“SERVICE”
followed by ROM version
“S-Vxx-yy”
5.1 Display Test
Purpose:
This test is used to check the driving circuits, the display and whether there are any short-
circuits, open-circuits or any other defects.
Following display patterns are used to test the display and its connections to µP.
Pattern 1:
All display control pins are ON
Mode Dim 1 is selected.Brightness is 75%.
- to check for open-circuits
Pattern 2:
Alternate display control pins are ON (Test Pattern: 0x55)
Mode Dim 2 is selected. Brightness is 25%.
- to check for short-circuits
TEST
Activated with ACTION
EEPROM FORMAT
TEST
to Exit
Load default data. Display shows “NEW”.
Caution!
All presets from the customer will be lost!!
S refers to Service Mode
V refers to Version
xx refers to Software version number of BEA
(counting up from 01 to 99)
yy refers to Software version number of Front uP
(counting up from 01 to 99)
Main Menu
Key
“Display Test”
triggered ?
Display Test
N
Activate and
display
“Pattern1”
Key
“Display Test”
triggered ?
Y
Y
Select AUX source, press 2,5,8. (All 3 numbers must be keyed within 5 seconds).
N
Activate and
display
“Pattern2”
Key
“ ”
triggered?
Y
N
Service Test Program