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8.12
Section 8
Electrical System and Components
Figure 8-12.
2. Check the SAM part number, stamped on the side
of the housing, and determine if you have an
analog SAM (ASAM) or a digital SAM (DSAM).
Follow sub-step a for an ASAM, and sub-step b
for a DSAM. To help identify Service Bulletin 233
lists DSAM part numbers.
a. ASAM only: Depress the tester button and
hold it down. After approximately four
seconds, a numerical sequence should be
displayed, beginning with 1 or 2 and continuing
to 8 or 9, followed by a letter “P” (pass) or “F”
(fail). See Figures 8-11 and 8-12. DO NOT
release the tester button until the test cycle
completes and the display goes off*. If you get
a “-” sign instead of the numerical sequence,
and/or an “F” at the end of the cycle, the SAM
is probably bad. Recheck all of the
connections, check the condition of the tester
battery** and repeat the test. If you get the “-”
sign and/or “F” again in the retest, replace that
SAM.
*IMPORTANT!
Allow 15-20 seconds for the tester to clear and reset
itself between tests or if test is interrupted before
completion of test cycle. Otherwise, a false reading
may be displayed in the form of a “-” or a faint “8”.
b. DSAM only: DSAM firing points are different
and testing can only determine if the DSAM is
working not the actual firing points. Connect
the tester in the same manner and start the
test. If the numbers start advancing, the
DSAM is working. If a dash appears, the
DSAM is not working. Check all of the
connections and retest. If it still is not working,
replace the DSAM.
Figure 8-13.
**The tester is powered by a 9-volt battery. Most
SAM’s are designed to operate down to a minimum
of 7.25 volts. If the tester battery drops below that
level, incorrect test readings will result. The tester
battery should be checked periodically by connecting
a DC voltmeter between the red and green lead
wires, with the tester connected to a SAM. Press
and hold the test button for a full test cycle (‘‘F’’ or
"P’’ appears and then display shuts off), while
monitoring the voltage reading on the voltmeter. If
the voltage drops below 7.5 at any time during the
cycle, the 9-volt tester battery must be replaced. Use
an extended life (alkaline) battery.
To replace the battery, remove the outer set of screws
on the faceplate and carefully lift the panel from the
body. Unplug the connector and pull battery (with
mounting tape) off the back of the tester. Attach the
connector to the new battery and mount the battery to
the case with double-backed tape. Reinstall the
faceplate and secure with the four screws.
3. Disconnect the yellow and brown tester leads
from the long module leads. Connect the brown
tester lead to the short brown module lead.
Connect the yellow tester lead to the short yellow
(or pink) module lead. See Figure 8-13. Leave the
red and green leads connected. Repeat step 2.