Snack - Based Troubleshooting and Repair Guide
September, 2002 Page 9 of 54 1670065
2. The connector configuration for the Interface Board is as follows:
a. J55 Data Transfer Port. Data is transferred to and from the Interface Board and main
controller boards at this connector. The data transfer is accomplished by way of a 16-
conductor ribbon cable connected at J30 of the main controller board. The selection
matrix data, once activated (see selection matrix), is sent here, as well as cycle and
motor sense data which is monitored through this connector. Operational commands
are sent and received through this port by a serial data stream.
CAUTION:
Disruption of this data stream will result in a (TEMPORARY OUT OF SERVICE),
(ABCDEF+)
OR (NONE READY) diagnostic error message until such time as the
cause is corrected.
Pins 3 through 12, 14, and 16 provide the medium for the data stream, through the data
bus to and from all on-board IC chips. Pin 13 is used to reset IC’s requiring it at the
appropriate time. Pins 1 and 5 have 5 volts d.c. present for board logic circuit opera-
tion.
b. J56 Triac Board Connector. Not used in this machine.
c. J57 Frozen/Fresh Food Connector. Not used in this machine.
d. J58 Gum and Mint/Can Module Connector. Column lines, gum and mint sense,
even gum and mint row line and motor sense lines are provided at this connector. Pins
5 and 9 provide positive column lines (see the Matrix) in conjunction with transistors
Q1 through Q5, and Darlington array drivers U5 through U9. Positive column line
voltage for all motors within the merchandiser are provided by transistors Q1 through
Q5. The transistors are turned ON by Darlington drivers U5 through U9 when a selec-
tion has been made and the comparator motor sense line has been satisfied. The Dar-
lington will turn ON transistors Q1 through Q5 and provide the low to run the selected
motor(s). Pin 1 provides gum and mint sense by way of comparator circuit U10B.
All sense lines within the merchandiser operate by two comparators, U10A and U10B.
These components compare voltage changes in accordance with the presence of home
switch and railboard, and in conjunction with tray motor PCB circuits. A high or low
output is sent from the comparator to buffer chip U4A. The buffer chip reports to the
main controller as to the status of the tray motor(s). to provide diagnostic messages
when a railboard or motor is not sensed.
Pin 2 provides row line (Low) for Gum and Mint in conjunction with Darlington
driver, U9. Pins 3 and 4 provide odd and even sense lines respectively. Sense lines are
operated by two comparators, U10A and U10B.
e. J59 Row Line Connector. This connector provides odd and even row lines (ground)
for snack trays D, E, and F.
f. J60 Snack Tray Connector. All column lines, row lines and sense lines for trays A
through C are provided at this connector. Pins 1 and 2 provide odd and even row lines
for the C tray, 3 and 4 for the B tray, and 6 and 7 for the A tray. Pins 9 through 13 pro-
vide column lines for each tray (A through C). Pins 5 and 8 provide odd and even
sense lines.
g. J61 Input Power Connector. The main controller provides 24 vdc at this connector.
Pins 1 (ground) and 2 (24 volts) receive 24 volts unregulated voltage. This voltage is
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