ISCO 6700SR, Instruction Manual, Page: 85 / 190

6700SR Refrigerated Sampler
67
Chapter 4 Maintenance
Maintenance Screens
The maintenance screens include:
• Set the sampler’s clock.
• Set the number of pump counts for the pump tube warning.
• Reset the battery warning for the internal battery.
• Run a set of diagnostic tests on the RAM, ROM (Read Only
Memory), character locations on the display, pump, distributor,
and to reinitialize the sampler.
Charts for maintenance screens appear in Figure 28 , Maintenance
Screens on page 113.
Set Clock
Isco ships the samplers from the factory with the clocks set to the
correct Central Standard Time. Reset the clock when installing the
sampler in a different time zone, for daylight savings time, or when
needed. Setting the Clock and Calendar on page page 17 shows how
to set the time and date.
Diagnostics
The sampler has several self-diagnostic tests that check the mem-
ory (both the RAM and ROM), pump, and the distributor arm posi-
tion. It also contains screens that let you reset the sampler’s
program settings and memory to factory settings. You will not need
to run the diagnostic tests routinely. The diagnostic tests are a
troubleshooting tool; Isco’s Customer Service department staff may
ask you to run these tests when they work with you in diagnosing
problems with your sampler.
Memory Tests - Screen 4 and 5 show you the diagnostic tests for
memory. If either screen shows you a message saying that the
memory failed the test, contact Isco Customer Service.
Display tests - Screen 6 shows you the display test. You should
see the test pattern illustrated in the screen. If the pattern does not
match the illustration the display or its circuitry require repair.
Pump Tests - Screen 7 lets you start the pump test by selecting
YES. As the sampler runs the test, it first runs the pump forward for
a short period. Next, it displays an ON/OFF ratio number. After dis-
playing the forward pumping ratio, the sampler reverses the pump to
obtain a purge ratio. The acceptable range is between 0.80 and 1.25.
If either ratio is outside the acceptable range, the pump requires re-
pair. You do not need to pump liquid while running the test, and you
can run the pump test with or without a pump tube in the pump.
Distributor Test - The distributor test is provided for factory per-
sonnel to verify the distributor’s position as it rotates through the
24 positions (screens 12 through 14). The distributor arm flexes
slightly when it contacts the stop, and the sampler measures this
flexure. The sampler uses this measurement to position the arm ac-
curately over each bottle.
Chapter Contents
• Maintenance Screens. . . . . . . . 67
• Maintenance Checklist . . . . . . . 68
• Cleaning Guidelines . . . . . . . . . 68
• Cleaning Protocols for Priority Pol-
lutants . . . . . . . . . . . . . . . . . 69
• Replacing the Pump Tube . . . . 70
• Opening the Controller Case . . 73
• Recharging the Desiccant . . . . 74
• Replacing the Internal Battery . 75
• Servicing the Refrigerator. . . . . 77
• Refrigeration System . . . . . . . . 77
Diagnostic Screens
1
RUN
PROGRAM
VIEW REPORT
OTHER FUNCTIONS
• Select OTHER
FUNCTIONS.
2
MAINTENANCE
MANUAL FUNCTIONS
PROGRAMMING STYLE
• Select MAINTENANCE.
3
SET CLOCK
SET PUMP TUBE ALARM
INTERNAL BATTERY
DIAGNOSTICS
• Select DIAGNOSTICS.
4
PLEASE WAIT!
. . . ‘RAM’ PASSED TEST
• If the RAM fails the diagnostic
test, the sampler reports
’RAM’ FAILED TEST. Contact
Isco Customer Service for as-
sistance.