Troubleshooting Preliminary Considerations; Troubleshooting Flow Diagrams; Full-Duplex Echoplex Test - Beehive International B102 Service Manual

5.3.1 Troubleshooting Preliminary Considerations
The most common problems occurring in the B100
Series units are switch, control and operation-
related. A simple procedure may be followed to
help determine if the problem is control and/or
operation related or internal circuitry related
by checking the following:
Illegal Operation (Refer to Section II)
Improper Baud Rate Setting
Wrong Transmit or Receive Mode
Loose Interconnect Cable
5.3.2 Troubleshooting Flow Diagrams
A list of troubleshooting flow diagrams is given
in Table 5-1. This index lists apparent failure and
refers the user to the proper flow diagram. The
table is only intended to allow the user to verify
the subassembly where trouble exists and not to
indicate the specific problem. The user is advised
to return the defective subassembiy and have that
subassembly repaired or replaced by an authorized
service agent.
1. Find the apparent trouble in the Trou
bleshooting Flow Diagram Index.
2. Proceed to the specified Troubleshoot
ing Flow Diagram in the diagram section
and begin the troubleshooting procedure.
3. If an adjustment procedure is referen
ced in the Troubleshooting Flow Diagram,
perform the adjustment and return to the
flow diagram to complete.the trouble
shooting process.
4. Reference is made to Timing diagrams
contained in (Section VI) this manual.
5.3.3 Full-Duplex Echoplex Test
A specially wired connector may be assembled
that will allow the operator to perform this test.
This connector tester allows the terminal to be
operated and tested Independent of an external
data device. The connector mates with the Main
I/O Port. Set-up for the test is as follows:
FDX (Full Duplex Mode)
Baud Rate - Any Setting
Test Connector Installed
in the I/O Port
5-2
Enter data from the keyboard as you would if you
were on-line to a computer. If data is displayed
on the screen properly, then the 8100 series unit is
transmitting and receiving data properly.
The Test Connector is wired as follows:
(Refer to Figure 5.1.)
Connects Transmitted Data Line out of
the terminal to received data line into the
terminal. Pin 2 to Pin 3 of the I/O Port.
Pin 3
Pin 2
Jumper between
Pin 2 and Pin 3
0
(D
Amphenol Male Type
Connector
Beehive Part No. 606-0011-25 AP
FIGURE 5-1
ECHOPLEX TEST CONNECTOR