User Manual

TR-800 Service Manual
-33-
Power Management Board Adjustment
Test Apparatus
1、 20A/30V Power Supply 1set
2、 Analog ammeter 1set
3、 Digital Voltmeter 1set
4、 12V lead acid battery (not fully charged) 1set
Circuit detect and temperature-control test
Connect CN0201 (To Power Supply) and CN0204 (To Ext. Battery) with DC power output 13.8V respectively.
Measure Adjustment
Item Condition
Instrument Point Point Method
Specification/Remark
AC to DC
over-voltage
detect
/
Digital
voltmeter
CR0219 CN0201
Increase or
decrease
the input
voltage
Gradually increase the voltage of
CN0201 to 16.4V, the protection
circuit will drive KR01 to revert
to DC power supply. Decrease the
voltage of CN0201 to 13.4V and
return to AC power supply.
AC mains fail
detect
/ / CR0219 CN0201
Close or
open input
voltage
Remove the voltage of CN0201,
driving KR01 to revert to DC
power supply with CR0219
illuminates; Apply voltage to
CN0201, and KR01 is activated,
then return to AC power supply with
CR0219 goes out.
Battery low
detect
Close
CN0201
voltage
Digital
voltmeter
CR0219
,BAT
LOW
CN0204
Raise or
lower input
voltage
Gradually decrease the voltage of
CN0204 to 10.2V, driving KR01 to
cut down DC power supply, with
CR0219 goes out, “BAT
LOW”provides a low; Apply voltage
to CN0201, with CR0219 flashes
briefly, then return to AC power
supply; remove the voltage of
CN0201, gradually increase the
voltage of CN0204 to 12V, the
KR01 is activated to toggle to DC
power supply with CR0219
illuminates.
Thermal
controlled fan
Soldering
iron or hot
air gun
Digital
voltmeter
Fan Rth0201
Heating or
cooling
Heat the Rth0201 with soldering
iron or hot air gun, check the
voltage of fan increases
(6.0V~11.5V) with the air flow
increases.