Specifications

supplied to J10-29 on the Transmitter Interface. This voltage is
sent out on J7-1 to the three inner front door interlocks. If all the
front inner doors are closed the voltage returns to the Transmitter
Interface board on J7-2. This voltage is sent back out on J7-4 to
the five rear interlocks. If all the doors and ground stick switches
are closed the voltage is connected to the anodes of the solid
state relays K3 and K4. When the Controller calls for a Contactor
to close to turn on the transmitter the Controller supplies aground
to the cathode of the respective solid state relay through the
Transmitter Interface board and Driver Encoder board.
If any one of the eight doors are opened, the voltagefor both solid
state relays is disconnected and the transmitter is shut OFF.
P.4.5
Circuit Board Interfaces
The rest of the Transmitter Interface board is input and output
connections between the circuit boards mounted on the back of
the front door and other boards in the transmitter.
P.5 Troubleshooting Transmitter Interface
P.5.1 Interlock Status
Troubleshooting the interlock is done by using the Interlock
Status and Interlock Control Diagrams located at the end of this
section and a meter to measure continuity and voltage.
P.5.2
Metering Amps
The samples +22VDC, -22VDC, +8VDC, -8VDC, B+ and B-
for the Control Multimeter are generated on this board.
a. If any of these are lost, verify the presence of the voltage
on U1 or U2.
b. If the voltage is present replace the U1 or U2 associated
with that sample.
c. If not present refer to the overall wiring diagram to trace
the missing voltage.
P.5.3
Cable Interlock
The five Mod Encoder Interlocks are summed on this board at
U3.
a. If a fault is suspected check U3-8.
b. If this is low check the input pins 1 through 5 and 13 for a
logic high.
c. If all the pins are high replace U3.
d. If any of these are low refer to the Mod Encoder section to
troubleshoot an interlock fault.
The rest of the board consists of pass through connections. Refer
to the Transmitter Interface Schematic to trace the signal through
the Interface board.
Figure P-2. Interlock Control Chain
888-2339-002 P-3
WARNING: Disconnect primary power prior to servicing.