FORM 150.40-NM20
71
YORK INTERNATIONAL
RECIP CHILLER SMART PANEL
ALL MODELS YCH
Incorrect Field Insertion of J3 and J6 Plugs Into
the REV. C Microprocessor Board
The J3 and J6 jacks on the REV. C Microprocessor Board will allow the plugs to be inserted upside down. This
usually causes damage to the control panel as well as possibly an external device. The Micro Panel is susceptible
to this problem when the Microprocessor Board is replaced or a printer is connected.
If J3 is inserted upside down, damage will most likely result to the 2T transformer and occasionally the Power Supply
Board and the Microprocessor Board. Damage to the latter two is rare and will only occur if the internal fuse in the 2T
transformer does not open. Normally the internal fuse opens in the 2T transformer and can be replaced by simply
locating the fuse under the brown paper wrapping, carefully slitting the paper and soldering in a new fuse. The fuse
is a standard 3/4 A glass type which can be acquired almost anywhere.
Incorrect insertion of the J6 plug may damage the Microprocessor Board RS-232 port and the external printer. Care
should be taken since this plug is often connected and disconnected.
The following drawings show the correct and incorrect insertion of these plugs and how the locking tabs should line
up when the plugs are properly mated.
TOP VIEW
SIDE VIEW
CORRECT MATING OF JACK AND PLUG
INCORRECT MATING OF JACK AND PLUG
LD01898
JACK ON
MICROPROCESSOR
BOARD
PLUG ON WIRING FROM
POWER SUPPLY BOARD
PLUG ON WIRING FROM
POWER SUPPLY BOARD
JACK ON
MICROPROCESSOR
BOARD
Printed Circuit Board Wiring
Locking Tab Locking Tab
NOTE CORRECT POSITION
OF LOCKING TABS
NOTE INCORRECT POSITION
OF LOCKING TABS
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