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JOHNSON CONTROLS
135
FORM 150.62-NM8 (1020)
4
KEYPAD
The operator keypad is connected to the I/O Board by a
ribbon cable, which is connected to J2 on the I/O Board.
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 I/O Board must be turned
off, and the ribbon cable disconnected
from the I/O Board prior to conduct
-
ing the tests, or component damage
may result.
After the ribbon cable is disconnected from I/O Board,
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.
TABLE 39 – KEYPAD PIN ASSIGNMENT
MATRIX
KEYPAD
PIN CONNECTIONS
STATUS
1 TO 5
OPER DATA
1 TO 7
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
Содержание YCAL0014E Series
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