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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
SERVICE
Page: 56
INSPECTION GUIDE
OPERATOR ACTION
RESULT
CORRECT, Incorrect
Reason/Correction
TURN SYSTEM ON
POWER LIGHT FLASHING
Power light solid
Power light off
Turn off & restart
Check fuse & line voltage
Check power supply 5v fuse
RESET/RESET/ENTER
POWER LIGHT SOLID
Power light flashing &
Top Display = “----"
Top display = E1
Top display = E2
Top display blank
BOTTOM DISPLAY =
"SYSTEM WARM-UP
"PLEASE WAIT MM:SS"
Random
Blank
CLOCK COUNTS DOWN TO ZERO
No count down
ALARM LED'S BLANK
Random LED's ON or flashing
CALIB LIGHT OFF
Calib light on
System is re-setting, check for channel cable short
EPROM error (fatal)
RAM error (fatal)
Check +15 & -12V on power supply
Check display ribbon cable, cold start
Check line: must be >90 VAC, Check EPROM
Check ribbon cable to display
Check -12v on power supply
Check lithium battery for 2.5V, Check U15
Reset alarms, If not fixed cold start.
Reset system
MODE/ENTER
CALIB LIGHT ON
Calib light off
Procedure error: retry
RESET
UPPER DISPLAY CYCLES
ALL MODULE NUMBERS
Lower display = "No modules installed
Not all installed module #'s displayed
Lower display shows
"Module numbers must be 1-2” or “1-4"
TROUBLE LIGHT OFF
Trouble light on
Check module channel wiring
Check connector panel seating to controller
Check +20V between channel pins 1 and 3
Check +15 & -12V supply
Check for oscillation on channel pin 2
Correct above items, replace analog multiplexor
Check respective cabling including cross-wiring, opens,
shorts, leakage
Check cable length & size versus instruction manual
Check # of modules on cable run (Max. 4)
Check modules for correct digital address
Test modules by swapping working for non-working
Test modules on short cables at controller to eliminate
cable doubts. Modules will only be recognized when
controller is in Change/Calib mode
Controller has 2 or 4 channel software, but module
numbers have been set >2 or >4
Read lower display for error message and check upper
display for module # (See specific error message
instructions in this manual)
RESET/RESET/ENTER
TOP DISPLAY CYCLES ALL MODULES
WITH "00" CONCENTRATION
Some/all modules indicate "no factors"
Some/all modules indicate "uncalibrated
Lower display reads: "Replace Battery"
Lower display reads: "Calib Switch On"
Lower display reads: "Diagnostic Scan"
Lower display reads: "Fast Error Check"
Lower display reads: "Module Off"
Lower display reads: "Module Warm-up"
Input factors via Change Module and calibrate
Calibrate
Check/Replace lithium battery
Magnetic switch in sensor head is on
Exit Scan with code "0009
Exit Scan with code "0009
Turn module "on" in "Change Module" mode
Wait for clock to zero