Service manual

PN 4237242C
4.8-2
SERVICE AND REPAIR PROCEDURES
USER RESOURCE ADAPTER (URA) CARD
Installation
1. On the new URA card, Figure 4.8-1, verify that:
r Jumper X1 is ON
r All eight positions of switch SW1 are OFF.
2. Install the URA card into the second, 16-bit expansion slot from the left (facing the
instrument).
3. Replace the screw that fastens the card's metal mounting bracket to the rear of the
chassis by using a #1 Phillips-head screwdriver (Figure 4.6-1).
4. Reconnect cables J1 through J7 to the card:
r J1 - supplies power to the linear supply in the lower chassis.
r J2 - the vacuum voltage from the Vacuum Sensor card.
r J3 - the AIM voltage from the SPAD card.
r J4 - a ribbon cable going to the LCD screen.
r J5 - a flex cable coming from the keypad.
r J6 - Hgb preamp.
r J7 - the preamp diagnostics voltages.
5. Replace the top cover.
6. Reconnect the ac power cable.
Verification
There are five functions of the URA card that need to be verified. The two most important
functions, interfacing the display and the keypad, can be checked by running a cycle. Going
through various menus will make use of many keys as well.
1. Turn ON the instrument’s power and allow the system to reach the Main Menu. During
power ON, two voltage checks are made. If no errors display, the A/D converter is
operating properly.
2. Use various items to check the display and keypad. For example, verify that the display
and keypad are operating properly by inputting a 10-digit Sample ID at the Main Menu.
3. Go through all the screens in the Setup menu and make sure that they match the
customers settings. From the Main Menu, select
5 SPECIAL FUNCTIONS tt 1 SETUP.
Note: There is CMOS RAM (Figure 4.8-1) on the URA card containing all the customer’s
configuration settings (Printer options, control options, and host settings). If the new
URA CMOS memory is clear, and the system booted with the same disk that the
customer was using, the settings will match. Any other set of circumstances will produce
different settings. For more information on what could happen with these settings, see
the description of the URA card in Heading 2.4.
4. With a sample running, verify that the “running marker” in the upper-right corner of the
display is “rotating.” This makes use of the Utility Timer circuit on the URA card.
5. Perform an SVP (Heading 5.1).