EASTMAN Kodak X-Omat 180 LP, Service Manual

Page: 78 / 134

SERVICE MANUAL
3–8 July 1995 – 1C7833
Operation of the INTERLOCK BOARD for the TOP COVER
The INTERLOCK BOARD (the 4000 BOARD) disables the SORTER transport if the BIN is removed
from the SORTER. The 4000 BOARD is a safety device.
S20 is the INTERLOCK SWITCH for the BIN. When the BIN is in position, S20 is on. When S20 is
on, the 24 volt return on PIN 4002 of CONNECTOR P4002 on the INTERLOCK BOARD is applied
to PIN 1 of P4002 on the INTERLOCK BOARD through the S20 SWITCH. This turns on RELAY
K1. LED DS20 illuminates to indicate that RELAY K1 is on. RELAY K1 applies 24 volts through a
current-limiting resistor to PIN 3 of P3 on the INTERLOCK BOARD, which provides power to the
MOTOR CONTROLLER. The current-limiting resistor limits the initial surge of current that the
MOTOR CONTROLLER would normally draw. This limitation is done to keep from loading down
the 24-volt POWER SUPPLY. The 24-volt return signal supplied by the S20 INTERLOCK SWITCH
for the BIN is also applied to a TIMER U2. The TIMER delays the turn on of RELAY K2
approximately
1
⁄
4
second. RELAY K2 then supplies 24 volts to the MOTOR CONTROLLER by
passing the current-limiting resistor. LED DS2 illuminates to indicate that RELAY K2 is on.
LED DS3 indicates that 24 volts is being applied to the MOTOR CONTROLLER. If the BIN is
removed, the 24-volt return is removed, and both the K1 and K2 relays open turning the MOTOR off.
Figure 3–6
Operation of the INTERLOCK BOARD
+24V
K1
K2
DS2
DS1
J/P4002
S20
24V Retrun
4000 Board
Motor
Controller
Current
Limiting
Resistor
DS3
U2
1/4 second
delay
timer
2
1
P/J4003
3
Bin Interlock
Switch
H127_0003HC_