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YORK INTERNATIONAL76
TABLE 2 – MICROBOARD PROGRAM JUMPERS
MICROBOARD PROGRAM JUMPERS
JP1 - Watchdog enable/disable. The position of this
jumper, in conjunction with Program switch SW
1 position 12 enables or disables the program
Watchdog protection.
Never disable the watchdog protec-
tion. Severe compressor or chiller
damage could result. The ability to
disable the watchdog protection is
provided for factory testing only!!!
IN - Watchdog protection enabled.
OUT - Permits Program switch SW1 position 12 to
enable or disable the program
Watchdog protection as follows:
Position 12 ON - Watchdog protection enabled
OFF - Watchdog protection disabled
JP2 - Display power and logic levels. Determines the
power supply voltage applied to the display.
Pins 1-2: +5VDC SHARP LQ10D367
Pins 2-3: +3.3VDC LG Semicon LP104V2
displays.
If this jumper is not correctly installed
the display could become damaged.
JP3 - Display backlight enable signal level polarity.
Jumper must be positioned according to the
voltage level required to turn on the Display
Backlight.
Pins 1-2: 0VDC (Not used)
Pins 2-3: +12VDC or +5VDC as determined
by position of JP4. SHARP LQ10D367 and LG
Semicon LP104V2 displays.
JP4 - Display backlight enable signal logic levels.
Determines the logic levels of the Backlight
enable signal.
Pins 1-2: +12VDC/0VD (Not used)
Pins 2-3:+5VDC/0VDC LG Semicon LP104V2
displays.
JP5 - Display backlight power. Determines the power
supply voltage applied to the Display Backlight
Inverter Board.
Pins 1-2: +12VDC. SHARP LQ10D367 and
LG Semicon LP104V2 displays.
Pins 2-3: +5VDC. (Not used)
JP6 - Display memory type. Jumper must be posi-
tioned according to type of RAM used for
display memory devices (U25 & U27).
IN - EDO: (extended data out) type. Jumper
should be IN.
OUT - FPM: (fast page mode) type. Not used
at this time.
JP7, JP8 - Display brightness control technique.
Determines whether the display brightness is
controlled by a variable voltage or variable
resistance.
IN: Variable voltage (0-5.0VDC). SHARP
LQ10D367 and LG Semicon LP104V2 displays.
OUT: Variable resistance. (Not used)
JP9 - COM 2 serial communications port. Congures
COM 4 port to be either RS-485 or RS-232.
Pins 1-2: RS-232
Pins 2-3: RS-485
JP10 - JP26 - Not used.
Service