Tennant 7100, Service Manual

Page: 291 / 305

ELECTRICAL
4-123
7100 330695 (8 − 11)
DOES MACHINE
POWER UP ?
GO TO POWER −
UP TESTING
SECTION
No
SCRUB SYSTEM
OPERATION: WHEN THE SCRUB BUTTON IS PUSHED, THE MACHINE ACTIVATES THE ONE TOUCH SCRUB SYSTEM:
− THE SQUEEGEE LOWERS
− THE VAC FAN TURNS ON
− THE SCRUB HEAD COMES DOWN
− THE ES SYSTEM TURNS ON IF IT PREVIOUSLY WAS ON.
WHEN NOT IN NEUTRAL:
− THE BRUSHES TURNS ON
− THE SOLUTION VALVE TURNS ON AND IS REGULATED BY THE FLOW CONTROL LEVER ON THE CONTROL PANEL WHILE THE
WHILE THE SCRUB ACTUATOR LOWERS OR LIFTS:
− TO LOWER, 29/WHT (P3 − 4) RECEIVES POSITIVE VOLTAGE WHILE 30/TAN (P3 − 5) IS PULSED LOW
− TO LIFT, 30/TAN (P3 − 5) RECEIVES POSITIVE VOLTAGE WHILE 29/WHT (P3 − 4) IS PULSED LOW
PRESS THE SCRUB BUTTON
AND PROPEL FORWARD
− DOES THE SCRUB SYSTEM
AUTOMATICALLY TURN OFF ?
GO TO SELF TEST MODE
1. WHILE HOLDING THE SQUEEGEE BUTTON, TURN THE
KEY TO THE START POSITION AND THEN RELEASE IT.
2. KEEP HOLDING THE SQUEEGEE BUTTON UNTIL SCRUB
PRESSURE LED #3 IS LIT AND THEN RELEASE IT.
3. PRESS AND RELEASE THE SQUEEGEE BUTTON AGAIN
− DID THE MACHINE PASS SELF TEST ?
Yes
No
RECORD ERROR,
THEN GO TO ”SELF
TEST ERROR BREAK
DOWN PAGES”
No
DID THE BRUSH
HEAD LOWER
AND LIFT
DURING SELF
TEST ?
Yes
THE ACTUATOR IS
STUCK
REPLACE ACTUATOR
No
SCRUB SYSTEM IS
PASSING SELF
DIAGNOSTICS −− IF
FAULT IS WITH
SOLUTION VALVE, GO
TO SOLUTION VALVE
TEST
Yes
IS THE RED
OVERFLOW LED ON ?
Yes
DRAIN RECOVERY
TANK −− TURN SCRUB
SYSTEM BACK ON
− DOES OVERFLOW
LED STILL TURN ON ?
SYSTEM TESTS
GOOD
No
Yes
GO TO INPUT TEST MODE & TEST OVERFLOW SWITCH
1. TURN THE KEY OFF
2. WHILE HOLDING THE SQUEEGEE BUTTON, TURN THE
KEY TO THE START POSITION AND THEN RELEASE IT.
3. KEEP HOLDING THE SQUEEGEE BUTTON UNTIL SCRUB
PRESSURE LED #3 IS LIT AND THEN RELEASE IT.
4. PRESS AND RELEASE THE SCRUB BUTTON UNTIL BOTH
SCRUB PRESSURE LED’S #2 & #3 ARE ON.
5. PRESS AND RELEASE THE SQUEEGEE BUTTON AGAIN
TEST/SIMULATE THE RECOVERY TANK FULL SWITCH (S1)
DOES THE OVERFLOW LED TURN ON THEN OFF ?
Yes
Yes
SYSTEM
ALWAYS OFF ?
SYSTEM
ALWAYS ON
?
No
RECOVERY TANK
FULL SWITCH (S1),
20/TAN OR 13X/BLK
HAVE FAILED OPEN
Yes
No
RECOVERY TANK
FULL SWITCH (S1) IS
SHORTED CLOSED OR
20/TAN IS SHORTED
TO GND
Yes
No
IS #1 BATT. LED
FLASHING ?
No
ARE ALL 3
BRUSH
PRESSURE LEDS
FLASHING ?
No
ARE BATT.’S LOW ?
Yes
PERFORM BATT.
MAINTENANCE
Yes
CONNECTIONS
TO BATT.’S
GOOD ?
No
REPLACE/
REPAIR/CLEAN
CONNECTIONS
REPLACE
BOARD
No
Yes
No
Yes
THIS INDICATES THAT THE BOARD SENSES A LOW
SIGNAL (< 1V) ON THE 17/PUR CIRCUIT (P4 − 10) AND
THINKS EITHER CB7 OR CB8 HAS OPENED
TO TEST THIS, GO TO INPUT TEST MODE
1. TURN THE KEY OFF
2. WHILE HOLDING THE SQUEEGEE BUTTON, TURN THE
KEY TO THE START POSITION AND THEN RELEASE IT.
3. KEEP HOLDING THE SQUEEGEE BUTTON UNTIL SCRUB
PRESSURE LED #3 IS LIT AND THEN RELEASE IT.
4. PRESS AND RELEASE THE SCRUB BUTTON UNTIL BOTH
SCRUB PRESSURE LED’S #2 & #3 ARE ON.
5. PRESS AND RELEASE THE SQUEEGEE BUTTON AGAIN
TURN ON THE SCRUB SYSTEM AND WHEN THE M1
CONTACTS CLOSE, BATT. #4 LED SHOULD TURN ON
SHOWING THAT THAT 17/PUR CIRCUIT IS NOT SENSING A
LOW SIGNAL (< 1V).
AT THIS POINT, IF THE LED IS OFF, THE BOARD IS
SENSING A LOW SIGNAL (< 1V)
−− RESET CB7 &/OR CB8
FAULT CORRECTED ?
No
Yes
17/PUR CIRCUIT
STILL LOW ?
No
REPAIR/REPLACE ANY POOR OR
BAD CONNECTIONS @ CB7 & CB8
OR @ M1 CONTACTS CAUSING 64/
PUR OR 62/BLU CIRCUITS TO BE
PULLED LOW (< 1V) OR 17/PUR
CIRCUIT TO SHORT TO GND.
Yes