Johnson Controls YVAHP0721CW Series, Service Manual

Page: 181 / 416

SM-16007
3-17
TROUBLESHOOTING
03: Backlight Test
04: Contrast Test
05: Run Indicator Test
A
(1) Press and hold “Menu” and “ECO” simultaneously
for three seconds during the normal mode (when
unit is not operating).
The Check Menu is displayed.
Check Menu
Self Checking
02
/
02
I. U./O. U. PCB Check
Entr Sel. Rtrn
Back OK
(2) Select “Self Checking” from the Check Menu and
press “OK”.
(3) Select the process for “Self Checking”.
* To start self check, press “ECO”.
* To clear EEPROM, press “ ” and “ECO”
simultaneously.
See EEPROM clear process (15) below.
0 1 : 0 0 0
P-3400
ARF-8Y050 2008.11.06
12:34
Self Checking
(4) LCD Test
Press “OK” and the screen will change as shown
at the right.
0 2 : 0 0 0
Self Checking
(5) Backlight Test
LCD brightness is changed gradually by pressing
“OK”.
0 3 : 0 0 0
Self Checking
(6) Contrast Test
Contrast of the LCD gradually changes by
pressing “OK”.
(7) Run Indicator Test
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and green twice for each.
(8) Button Input Test
Press the nine buttons one-by-one. The number
indicated with “
A ” will count up as buttons are
being pressed.
* The order of pressing buttons is random.
Do not press more than one button at a time. It
will not be counted.
0 6 : 0 0 0
Self Checking
(4) Self-Checking
Self-Checking checks the wired controller and clears EEPROM (storage cell inside of the wired
controller).