IBM 3112, Service Manual

Page: 42 / 184

bh1s.bk : bh1sdiag.doc 26 Thu Apr 20 12:42:16 1995
26
Service Manual
Ethernet 10Base-2: Attach a 50 Ohm BNC terminator cap to each end
of the T-connector. The customer may be able to provide this cap.
There is no wrap test for Token-Ring with Unshielded Twisted-Pair
cable or for Ethernet 10Base-T.
POR the printer. If the printer completes POR successfully, the printer,
network card, and the port to the LAN are working correctly. If the cus-
tomer still has a problem printing,
see “LAN Problems” on page 24.
Output Bin Sensor
Examine the bin area for obstructions or damage. Run the diagnostic
sensor test.
Note: There is an output bin sensor on the 3116-002 and 3116-003.
It is not on the 3112-001 or the 3116-001.
Make sure the plastic bails and guide are in good condition and that
they guide the sensor flag out of and into the sensor as paper passes
into the bin. On the sensor, the voltage from pin 2 to pin 3 (pin 1 is the
bottom pin) should change from 0 to +5VDC as the sensor is blocked
and unblocked. Pin 1 should always m5VDC.
Replace the sensor, the sensor card or the operator panel/bin sensor
cable as necessary.
Operator Panel Problem
Note: If the printer is in “Menus Disabled” mode, you can activate
the menus by powering on the printer with the Return button and the
top button pressed. Repeat the POR procedure to disable the
menus again after service. If you need to change the displayed
language, use the Setup Menu.
Possible causes: failed LCD or operator panel card, cable or connector
problem, or engine board problem.
Replace the operator panel if POR stops with half rows of pels dis-
played.
Run the diagnostic tests for the LCD and for the buttons. If only some
buttons or pels work, replace the operator panel.