Johnson Controls York YCAL0014E Series, Installation, Operation & Maintenance Instructions Manual

Page: 123 / 216

JOHNSON CONTROLS
123
FORM 150.62-NM6 (103)
. TAbLE 39 – KEYPAD PIN ASSIGNMENT MATRIx
KEYPAD PIN CONNECTIONS
STATUS 1 TO 5
OPER DATA 1 TO 7
PRINT 1 TO 6
HISTORY 1 TO 8
UP ARROW 2 TO 5
DOWN ARROW 2 TO 7
ENTER/ADV 2 TO 6
COOLING SETPOINTS 2 TO 8
SCHEDULE/ADVANCE DAY 3 TO 5
PROGRAM 3 TO 7
OPTIONS 3 TO 6
CLOCK 3 TO 8
3
KEYPAD
The operator keypad is connected to the microboard
by a ribbon cable, which is connected to J2 on the mi-
croboard.
The integrity of a specific “button” on the keypad can be
verified by doing a continuity check across two specific
points (or pins), that represent one of twelve “buttons”
on the keypad.
Table 39 lists the key/pin assignments for the keypad.
Power to the microboard must be turned off, and
the ribbon cable disconnected from the microboard
prior to conducting the tests, or component damage
may result.
After the ribbon cable is disconnected from microboard,
ohmmeter leads are connected to the pins representing
the specific “button” to be tested. After connecting the
meter leads, the “button” being checked is pressed
and a reading of zero ohms should be observed. After
releasing the “button,” the resistance value should be
infinite (open circuit).
Pin 1 is usually identified by a stripe
on the ribbon cable.