Troubleshooting - HP 5334B Service Manual

8-289. REMOVAL PROCEDURE. Remove the
A2
board as follows:
a. Remove cover as described under paragraph 8-282.
b. At bottom of instrument, remove two front feet and two screws (0515-0890) in Front Panel Assembly
frame.
c. At top front of instrument, snap-off the plastic trim strip (MP11,5040-7202) with a small flat blade
screw driver.
d. Remove two screws (0515-0890) attaching the Front Panel (MP19,05334-00019
-
Standard Front
Panel; 05334-00024 Option 030 Front Panel) to the Front Frame (MP23,05334-20201).
e. Remove two Trigger Level Knobs (MP25,0370-1005).
f. Remove three "fancy" BNC nuts (0590-1251) that secure the INPUT A, B, and ARM connectors.
g. Now, separate the Front Panel Assembly from the chassis.
h. Unplug A2 Front Panel Board from A1 Main Board.
i.
The A2 Board is now accessible.
8-290. INSTALLATION PROCEDURE. To install or replace A2 Front Panel Board, perform the following:
a. Align A2 board with back of Front Panel and snap into place. There are four places to hold the
board in place. Insure these are set. Adjust board to center keycaps.
b. Secure the two Trigger Level potentiometers (pots) using one flat washer, lock washer and nut for
each pot. Hand start the nuts. Tighten using 5/16 spin-tight.
c. Using a small flat blade screwdriver, set the Trigger Level pots to full counterclockwise positions.
d. Place one knob on one of the pots, aligning the marker with the "R" in ARM on the front panel.
e. Secure the knob by using the proper allen wrench on the set screw. Tighten. Repeat steps d and e for
the other pot.
f. Place Front Panel into the Front Frame, pushing up and aligning the BNCs with the front holes and
pushing the panel up to get over the Front Frame edge.
8-291. REMOVAL AND INSTALLATION OF FRONT PANEL RED WINDOW. The seven-segment dis-
plays can be replaced through the front panel by removing the red window from the panel. To remove the red
window, perform the following:
a. To remove the red window (MP24,05334-40002), place a small flat-blade screwdriver between the
window and the front panel along the bottom edge and gently press up and out, then pull out the win-
dow.
b.
To install the red window, set window into panel, top edge first (make sure the rubber foam gasket,
05334-00011 is in place), then press down on window gently and snap the bottom edge into place.
8-292. TROUBLESHOOTING
8-293. The troubleshooting section is divided into two parts: (1) Signal Tracing and (2) Signature Analysis.
8-294. Other troubleshooting aids are the Operational Verification Tests found in Section IV of this manual.
They provide a good place to start the search for a HP
5334B
failure. These tests consist of power-up diagnostic
checks as well as functional checks of all the Counter circuit blocks.
HP 5334B
-
Service Manual
8-39