Read Sharp VC-MH85 (serv.man9) Service Manual online
34
VC-MH705HM/LM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
VC-MH815HM/LM,MH85HM
VC-MH715HM,MH835HM
Power Circuit ADJUSTMENT
ADJUSTMENT OF Output Voltage Confirm
Measuring
instrument
instrument
Mode
Fix Load
Power Consumption device
Power off
actual load
Test point
AC Plug
Specification
3.0W MAX
Item
Test point
Specification Fix Load
AT 12V
AT between 12Vline~GND
DC 12.5V
±
0.3V
360mA+actual load
AT 5V
AT between 5Vline~GND
DC 5.25V
±
0.1V
18mA+actual load
AT 39V
AT between 39Vline~GND
DC 39.0V
±
2.0V
actual load
AT 25.0V AT between 25.5Vline~GND DC 26.0V
±
0.5V
actual load
Measuring
instrument
instrument
Digital Voltmeter
<Setting Condition>
1. Power Supply : AC190V(50Hz)
2. SURROUND temperature Setting : 20ºC
1. Power Supply : AC190V(50Hz)
2. SURROUND temperature Setting : 20ºC
±
10ºC
3. load connect place : between AT 5V
→
AC connector
8
PIN~AC connector
1
PIN
(High speed) : between AT25.5V
→
AC
5
PIN~AC
2
PIN
(Other model) : between AT12V
→
AC
5
PIN~AC
2
PIN
ADJUSTMENT OF Over Load Characteristic
Confirmation
Confirmation
Item
Test point
Specification
Fix Load
AT 12V
AT between 12Vline~GND
Output above 11.0V 2.0~2.2A(over load)
AT 25.0V AT between 25.5Vline~GND Output above 25.0V
Measuring
instrument
instrument
Osiloscope
when apply the over load at the AT12V/AT25.5V output for
every 170msec, confirm that the output is 11.0V/25.0V for every
time.
every 170msec, confirm that the output is 11.0V/25.0V for every
time.
70
100
2.2A
0.65A
(A)
(msec)
ADJUSTMENT OF Power Consumption Con-
firmation
firmation
1.Power supply : AC230V(50Hz)
2.Surround Temperature Setting : 20ºC
2.Surround Temperature Setting : 20ºC
±
10ºC
