Sharp VC-MH834 (serv.man2) Service Manual ▷ View online
33
VC-M314HM
VC-MH834HM
VC-MH834HM
ADJUSTMENT OF LINE3(FRONT) INPUT
Level Confirmation HIFI Lch, Rch
Level Confirmation HIFI Lch, Rch
Mode
EE
ADJUSTMENT OF Receive Image CH
Confirm that there is no noise and beat in the receiving strenght
and weakness electrics signal.
and weakness electrics signal.
Measuring
instrument
instrument
Mode
Monitor Screen
EE
Specification
<On Screen Display>
Jumper List
Jumper List
On Screen Display confirm Display
Reference
Reference
TIMER Circuit ADJUSTMENT
ADJUSTMENT OF Timer Initial JP and Y/C
Rec Current Confirmation
Rec Current Confirmation
Measuring
instrument
instrument
Mode
Cassette
Voltmeter
EE
Self-recorded tape
Test point
AUDIO OUT
Specification
-3.8
±
2dBs
VIDEO
Optional
AUDIO
AUDIO IN at 1KHz -3.8dBs
Measuring
instrument
instrument
Mode
Digital Voltmeter
EE
Specification
2.5
±
0.5V
TUNER/IF Circuit ADJUSTMENT
ADJUSTMENT OF AFT Adjustment
Confirmation(except France)
Confirmation(except France)
Test point
P1501 pin 1
TU1401 pin23
TU1401 pin23
E-12ch, Input level 70dB
µ
While selecting channel input TEST MODE(press once
on TEST KEY R/C) and select E-12ch.
on TEST KEY R/C) and select E-12ch.
(Just Tuning)
Adjustment
ADJUSTMENT OF AFT Adjustment
Confirmation(France)
Confirmation(France)
F-10ch, Input level 70dB
µ
While selecting channel input TEST MODE(press once
on TEST KEY R/C) and select F-10ch.
(Just Tuning)
on TEST KEY R/C) and select F-10ch.
(Just Tuning)
F-4ch, Input level 70dB
µ
While selecting channel input TEST MODE(press once
on TEST KEY R/C) and select F-4ch.
(Just Tuning)
on TEST KEY R/C) and select F-4ch.
(Just Tuning)
HM
I40ch
LM
I-Jch
Measuring
instrument
instrument
Mode
Digital Voltmeter
EE
Specification
2.5
±
0.5V
Test point
P1501 pin 1
TU1401 pin23
TU1401 pin23
Display eg:
JP :
0
0
3
4
3
0
0
0
1
4
HEX CODE for Initial Jumper
YC :
34
34
07
07
PAL
PAL
NTSC
NTSC
SP
LP/EP
SP
EP
VM : F8FB
←
Video Mode
NOR__
←
ROM Version
1. During EE mode, send the TEST Code (R/C code 47H)
to VCR and hold the Test code, do not let go.
2. While sending the TEST code, the monitor screen will
display the initial JP and Y/C Rec Current setting,
Video mode and ROM Version condition.
Video mode and ROM Version condition.
3. After confirmation, Release the TEST code (R/C code
47H), display will return to EE mode.
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)
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)
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)
