Frontier LP7500 Service Manual page 416

Distributed by: minilablaser.com
Laser temperature control status of Status Display does not change from
Temperature control started to Temperature control completed. [LASER]
• For details about Laser temperature control status of Status Display, see
! ! ! ! Checking procedure
1.
Confirm that the system is used in the environment of room temperature 15°C to 30°C.
2.
Restart the system.
3.
Check if the displayed temperature on Laser Unit Thermosensor goes up when turning on the laser
unit heater via Output Check.
Check if laser unit cooling fan 1/2 operate when turning on laser unit cooling fan 1/2 via Output Check.
35310
4.
Check if the displayed temperatures of the B laser temperature sensor, R laser temperature sensor
and laser unit temperature sensor change via Output Check.
35210
N
OTE
• Temperature of the laser unit heater, B laser heater and R laser heater is adjusted at the same time.
5.
If there is a change in the displayed temperature, wait for a while. If the temperature does not change,
check the unit for faults.
If temperature of the laser unit thermosensor is not within the range from
15.0°C to 42.0°C
If the temperature of B laser thermosensor is not within the range from
46.7°C to 47.3°C.
If the temperature of R laser thermosensor is not within the range from
46.7°C to 47.3°C.
! ! ! ! If temperature of the laser unit thermosensor is not within the range from 15.0°C to
42.0°C
1.
Check if there is a wiring connection failure.
Laser control PCB (J/P1522) ↔ laser unit
2.
Make a diagnosis via the displayed temperature on the laser unit temperature sensor.
Checking point
Laser unit heater Laser unit heater resistance value
Laser Unit Laser unit thermosensor resistance
*1
Thermosensor value
Laser control PCB Laser unit thermosensor standard
voltage
Power supply to the laser unit
heater
Symptom
Wiring connection failure
Checking content
*2
4302
Diagnosis appendix: Diagnosis flowchart
31100.
The temperatures are not within the processable range of
the laser unit (15.0°C to 42.0°C).
Temperature is not in the processable range of B laser
(46.7°C to 47.3°C).
Temperature is not in the processable range of R laser
(46.7°C to 47.3°C).
Laser control PCB (J/P1541) ↔ laser power supply (+24 V)
How to check
Remove P1525 (connecting) and measure
the resistance value between Pin 1 and 2. It
is normal if the resistance value is 15 ± 1.5
Ω.
Remove P1526 (connecting) and measure
the resistance value between Pin 1 and 3. It
is normal if the resistance value is the same
*1
as that in the list below.
It is normal if the voltage between Pin 3 (+)
of P1522 and the ground is 1.0 V.
It is normal if the voltage between Pin 7 (+)
and Pin 8 of P1551 is the following.
• When the heater is turned on: 24 V
• When the heater is turned off: 0 V
4302
Diagnosis appendix: Diagnosis flowchart
Cause
Failure part
Laser unit (laser unit heater)
Laser unit (laser unit
thermosensor)
Laser control PCB
1/3