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5-57
5
AIR CONDITIONER
TROUBLESHOOTING
AIR CONDITIONER
“4. Disassembly and assembly, Air conditioner”
A The outlets temperature cannot be changed
Note:
1. After completion of repair work, make sure to reinstall the connectors removed for inspection.
2. Check if there is warm water at the IN side of the water valve.
3. By referring to the wiring diagram, check for continuity of the lines between the air conditioner harness connectors
beforehand.
The attenuator is
faulty
Replace
Check the temperature controlling operation
YES
Turn on the starter switch and then the air conditioner
switch (10R20R3). Turn the attenuator and check if the
voltage changes from 0 to 5 V between the following
wires of Connector (2).
• The green/black and green/white
• The green/black and yellow/black
(See the description about the temperature adjusting
switch below.)
NO
Is the voltage be-
tween the green/
black and yellow/
white wires 5 V?
NO
Replace the amplifier
YES
YES
Does the water valve rod in the control box move with
the output of the temperature control dial?
YES
Water valve is
faulty
Remove Connectors (1) and (2).
Check for continuity of the wires (yel-
low/white, yellow/black, green/white,
green/black of Connector (1)) and Con-
nector (2)
NO
NO
Repair the wire break/disconnection
Check if something is interfering with the link of the wa-
ter valve assembly or the operation of the water valve
motor actuator. Is there anything interfering?
YES
Remove the interfering thing or repair
or replace faulty parts
NO
Turn off the starter switch and remove Connectors (1),
(11), (12). Check for continuity in the wires (light green,
blue, yellow, green/yellow, red/white, white) of Connec-
tors (1) and (11). Are they electrically continuous?
NO
Repair the wire break/disconnection
YES
Check for mutual short-circuiting in the six wires con-
necting the motor actuator and the lamp. Is there a
short circuit?
YES
After repairing, perform a test opera-
tion. If the problem still exists, replace
the control amplifier (it could be dam-
aged by short-circuiting)
NO
Replace with a water valve motor actuator for testing,
and connect the connectors removed. Perform a test
operation. Is the operation normal?
NO
Control amplifier
is faulty
Replace the control amplifier
YES
Water valve motor
actuator is faulty
Replace the water valve motor actua-
tor
Summary of Contents for TB 250
Page 1: ......
Page 3: ...1 1 SAFETY 1 Safety alert symbol 1 2 Safety precautions 1 3 Cautions when working 1 9...
Page 36: ...2 24 2 TIGHTENING TORQUE SERVICE DATA...
Page 38: ...2 26 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with options 2 2...
Page 39: ...2 27 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 1 2...
Page 40: ...2 28 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 2 2...
Page 41: ...2 29 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 1 2...
Page 42: ...2 30 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 2 2...
Page 49: ......
Page 59: ...2 46 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 60: ...2 47 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 61: ...2 48 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 62: ...2 49 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 63: ...2 50 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 64: ...2 51 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 65: ...2 52 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 66: ...2 53 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 67: ...2 54 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 68: ...2 55 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 69: ...2 56 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 70: ...2 57 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 71: ...2 58 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 72: ...2 59 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 73: ...2 60 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA NAME STANDARD NO...
Page 74: ...2 61 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 75: ...2 62 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 76: ...2 63 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 77: ...2 64 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 78: ...2 65 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 79: ...2 66 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 80: ...2 67 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 81: ...2 68 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 92: ...3 11 3 CONTROL VALVE FUNCTION...
Page 108: ...4 3 4 SERVICE STANDARDS DISASSEMBLY AND ASSEMBLY Clearance for pin and bushing...
Page 352: ...ENGINE 6 Machine model Mounted engine TB250 4TNV88...