Sharp VC-M522HM (serv.man8) Service Manual ▷ View online
49
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
FLOW CHART NO.27 LINEAR SOUND MODE TROUBLESHOOTING(2) (For VC-M522HM)
No linear sound recording(E-E mode is possible)
Is there "L" level at pin(99) of
IC201?
Check the AUDIO MUTE (H) line between pin
(99) of IC201 and pin(21) of IC701.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is there signal at pin(4) of IC201?
Is the supply voltage of 12V fed to
pin(2) of T651?
Check M 12V line.
Is there signal(Bias) at pin(5) of T651?
Check the Bias oscillation circuit(T651,Q651,
Q652) and NORMAL BIAS CTL line.
Is there signal(Bias + Audio sig.) at
pin(6) of T651?
Check peripheral circuits of T651.
Check the MH-AA harness and A/C
head.
Replace IC201.
FLOW CHART NO.28 LINEAR SOUND MODE TROUBLESHOOTING(3) (For VC-M522HM)
No linear sound playback(E-E mode is possible)
Is there signal at pin(100) of IC201?
Are the MH-AA harness and the PB AMP peri-
pheral parts normal?
YES
YES
YES
YES
NO
Is there "L" level at pin(99) of IC201?
Check the AUDIO MUTE (H) line between pin
(99) of IC201 and pin(21) of IC701.
YES
NO
Is there signal at pin(11) of IC201?
Replace IC201.
NO
NO
Clean A/C head.
Readjust azimuth
Is the azimuth hight of A/C head properly
adjusted?
Replace A/C head.
50
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
FLOW CHART NO.29 DECODER TROUBLESHOOTING (VC-MH722HM/MH732HM)
<Hi-Fi Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SELECT
INPUT SIGNAL
FLOW
SIG.
FLOW
INPUT
(switch)
OUTPUT
OUTPUT SIGNAL
(A)
Pin47 of IC701(Y/C video output)
E2(L2) video input
→
pin19
pin18
pin20
→
E1(L1) video output
21PIN CONNECTOR
(B)
→
(A)
Pin20 of IC6401(Audio output L-ch)
E2(L2) audio input(L-ch)
→
pin36
pin1
pin35
→
E1(L1) audio output(L-ch)
21PIN CONNECTOR
(B)
→
(A)
Pin19 of IC6401(Audio output R-ch)
E2(L2) audio input(R-ch)
→
pin33
pin3
pin32
→
E1(L1) audio output(R-ch)
21PIN CONNECTOR
(B)
→
(A)
Tuner video output
E1(L1) video input
Pin47 of IC701(Y/C video output)
→
pin16
pin14
pin19
pin23
→
E2(L2) video output
21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX. output(L-ch)
E1(L1) audio input(L-ch)
Pin20 of IC6401(Audio output L-ch)
→
pin9
pin5
pin36
pin29
→
E2(L2) audio output(L-ch)
21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX. output(R-ch)
E1(L ) audio input(R-ch)
Pin19 of IC6401(Audio output R-ch)
→
pin11
pin7
pin33
pin28
→
E2(L2) audio output(R-ch)
21PIN CONNECTOR
(B)
→
(C)
→
(A)
E2(L2) video input
E1(L1) video input
Tuner video output
→
pin18
pin14
pin16
pin21
→
Pin31 of IC201
Y/C video input
(Tuner/Aux. input)
(B)
→
(C)
→
(A)
E2(L2) audio input(L-ch)
E1(L1) audio input(L-ch)
MPX. output(L-ch)
→
pin1
pin5
pin9
pin31
→
Pin15 of IC6651
Audio input(L-ch)
(B)
→
(C)
→
(A)
E2(L2) audio input(R-ch)
E1(L1) audio input(R-ch)
MPX. output(R-ch)
→
pin3
pin7
pin11
pin30
→
Pin10of IC6651
Audio input(R-ch)
(B)
→
(C)
→
NO
NO
NO
YES
YES
YES
Check STBY 5V line.
Check STBY 11V line.
Check line between pins(25), (26)
of IC2501 and pins(27), (28) of
IC701.
Is voltage 5V applied to the video
section power terminal at pins(15),
(17) of IC2501?
Is voltage 11V applied to the
audio section power terminal at
pins(8), (10) of IC2501?
Check signal line from video and
audio function logic table as shown
below.
Not output from 21pin connector in video and audio signal.
Is there SDA and SCL signal
applied to pins(25) and (26) of
IC2501?
FLOW CHART NO.30 DECODER TROUBLESHOOTING (VC-M522HM)
<Hi-Fi Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SELECT
INPUT SIGNAL
FLOW
SIG.
FLOW
INPUT
(switch)
OUTPUT
OUTPUT SIGNAL
(A)
Pin47 of IC701(Y/C video output)
E2(L2) video input
→
pin19
pin18
pin20
→
E1(L1) video output
21PIN CONNECTOR
(B)
→
(A)
Pin11 of IC201(Audio output)
E2(L2) audio input(L/R-ch)
→
pin36
pin1
pin35
→
E1(L1) audio output(L/R
-ch)21PIN CONNECTOR
(B)
→
(A)
Tuner video output
E1(L1) video input
Pin47 of IC701(Y/C video output)
→
pin16
pin14
pin19
pin23
→
E2(L2) video output
21PIN CONNECTOR
(B)
→
(C)
→
(A)
Tuner audio output(L-ch)
E1(L1) audio input(L/R-ch)
Pin11 of IC201(Audio output)
→
pin9
pin5
pin36
pin29
→
E2(L2) audio output(L/R
-ch)21PIN CONNECTOR
(B)
→
(C)
→
(A)
E2(L2) video input
E1(L1) video input
Tuner video output
→
pin18
pin14
pin16
pin21
→
Pin31 of IC201
Y/C video input
(Tuner/Aux. input)
(B)
→
(C)
→
(A)
E2(L2) audio input(L/R-ch)
E1(L1) audio input(L/R-ch)
Tuner audio output
→
pin1
pin5
pin9
pin31
→
Pin9 of IC201
Audio input
(B)
→
(C)
→
NO
NO
NO
YES
YES
YES
Check STBY 5V line.
Check STBY 11V line.
Check line between pins(25), (26)
of IC2501 and pins(27), (28) of
IC701.
Is voltage 5V applied to the video
section power terminal at pins(15),
(17) of IC2501?
Is voltage 11V applied to the
audio section power terminal at
pins(8), (10) of IC2501?
Check signal line from video and
audio function logic table as shown
below.
Not output from 21pin connector in video and audio signal.
Is there SDA and SCL signal
applied to pins(25) and (26) of
IC2501?
51
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
REPLACEMENT OF IC705(E
2
PROM)
Servicing precautions
When the IC705(E
2
PROM) has been replaced, make the following reprogramming.
Depending on models, the IC705(E
2
PROM) has been factory adjusted for it’s memory function.
It’s therefor necessary to reprogram the memory function for the model in question.
Note that the servo circuit requires readjustments for the slow and still modes.
Note that the servo circuit requires readjustments for the slow and still modes.
1. Memory function reprogramming.
1. Check the power off.(Power is standby mode)
2. Make for moment short-circuit test point(P802), located at the front side on the main PWB.
2. Make for moment short-circuit test point(P802), located at the front side on the main PWB.
Be sure that all the fluorescent display tube light up into the TEST mode.
3. Using the CHANNEL(+) AND (–) buttons, select the right function numbers from JP0 to JP39, which appear in the
fluorescent display tube, referring to the E
2
PROM map.
Press the DISPLAY button to pickup the functions(ON) and the CLEAR button to discard the functions(OFF).
DISPLAY and CLEAR buttons, are located on the remote control unit.
DISPLAY and CLEAR buttons, are located on the remote control unit.
∗
when the DISPLAY button has been pressed (ON), the memory function number starts flashing.
∗
when the CLEAR button has been pressed (OFF), the memory function number lights up.
4. Press the FF button on the remote control unit.
By doing, lower 7 of the 10 digits are displayed in hexadecimal notation.
5. Similarly to the above step 4, press the STOP button on the remote control unit.
By doing, upper 3 of the 10 digits are displayed in hexadecimal notation.
6. Example : "ON" and "OFF" are taken as "1" and "0" respectively.
The numbers JP0 to JP39 are divided into four groups and each group’s setting is displayed in hexadecimal notation.
1
When the press the FF button on the remote control unit.
By doing, lower 7 of the 10 digits are displayed in hexadecimal notation.
By doing, lower 7 of the 10 digits are displayed in hexadecimal notation.
JP27 JP26 JP25 JP24
1
1
0
0
↓
C
JP23 JP22 JP21 JP20
0
0
0
0
↓
0
JP19 JP18 JP17 JP16
0
0
0
0
↓
0
JP15 JP14 JP13 JP12
0
1
0
0
↓
4
JP11 JP10 JP9 JP8
0
0
1
1
↓
3
JP7 JP6 JP5 JP4
0
0
0
0
↓
0
JP3 JP2 JP1 JP0
0
0
0
0
↓
0
2
When the press the STOP button on the remote control unit.
By doing, upper 3 in the 10 digits are displayed in hexadecimal notation from the feature function.
Also recording level preset number selected from the ten keys on the remote control unit which appear in the
fluorescent display tube, referring to the E
By doing, upper 3 in the 10 digits are displayed in hexadecimal notation from the feature function.
Also recording level preset number selected from the ten keys on the remote control unit which appear in the
fluorescent display tube, referring to the E
2
PROM map.
3
When the press the REW button on the remote control unit.
By doing, recording level preset number selected from the ten keys on the remote control unit which appear in
the fluorescent display tube, referring to the E
By doing, recording level preset number selected from the ten keys on the remote control unit which appear in
the fluorescent display tube, referring to the E
2
PROM map.
Out lights
blank
LP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
LP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
Out lights
blank
SP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
"0" fixed
displayed
JP39 JP38 JP37 JP36
0
0
0
0
↓
0
JP34 JP33 JP32
0
0
0
↓
1
JP31 JP30 JP29 JP28
0
0
0
0
↓
0
52
VC-M522HM
VC-MH722HM
VC-MH732HM
VC-MH722HM
VC-MH732HM
2. Memory recording preset level reprogramming.
1. Similarly to the above step 1-1 and 2 the same operate.
2. Using the CHANNEL (+) AND (-) buttons, select the right function numbers continued from recording preset number
2. Using the CHANNEL (+) AND (-) buttons, select the right function numbers continued from recording preset number
as has been JP0~JP39, which appear in the fluorescent display tube, referring to the E
2
PROM map.
3. Press the STOP or REW button on the remote control unit.
By doing, recording level preset number selected by turn from the ten keys on the remote control unit, which appear
in the fluorescent display tube referring to the E
in the fluorescent display tube referring to the E
2
PROM map.
4. Example :
System
p : PAL
↓
Tape speed
→
LP or EP
p
∗
∗
↑
↑
Chrominance preset number. (from "0" to "7")
Luminance preset number. (from "0" to "7")
3. Finally make for a moment short-circuit test point(P802), both located at the front side on the main PWB to clear the
TEST mode.
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