Read Sharp VC-MH834 (serv.man2) Service Manual online
34
VC-M314HM
VC-MH834HM
VC-MH834HM
Power Circuit ADJUSTMENT
ADJUSTMENT OF Output Voltage Confirm
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 25.5V AT between 25.5Vline~GND Output above 25.0V
Measuring
instrument
instrument
Oscilloscope
ADJUSTMENT OF Power Consumption Con-
firmation
firmation
Item
Test point
Specification Fix Load
AT 12V
AT between 12Vline~GND
DC 12.0V
±
0.5V
360mA+actual load
AT 5V
AT between 5Vline~GND
DC 5.2V
±
0.20V
18mA+actual load
AT 39V
AT between 39Vline~GND
DC 38.0V
±
2.0V
actual load
AT 25.5V AT between 25.5Vline~GND DC 25.5V
±
0.5V
actual load
Measuring
instrument
instrument
Digital Voltmeter
<Setting Condition>
1. Power Supply : AC190V(50Hz)
2. Surroung temperature Setting : 20ºC
1. Power Supply : AC190V(50Hz)
2. Surroung 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
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.
for every 170msec, confirm that the output is 11.0V/25.0V
for every time.
70
100
2.2A
0.65A
(A)
(msec)
Measuring
instrument
instrument
Mode
Fix Load
Power Consumption device
Power off
actual load
Test point
AC Plug
Specification
2.5W MAX
1.Power supply : AC230V(50Hz)
2.Surround Temperature Setting : 20ºC
2.Surround Temperature Setting : 20ºC
±
10ºC
IGR(MPX) Circuit ADJUSTMENT
ADJUSTMENT OF Separation Confirmation
Test point
RCA AUDIO OUT
Specification
R-Lch more than 30dB
1. Receive the IGR Bilingual Broadcasting (STEREO).
(Signal content L-ch
±
0kHZ dev)
(Signal content R-ch
400Hz 0
±
50kHz dev)
2. Connect the RCA AUDIO out put L-ch to Voltmeter.
(weight : flat)
