Sharp VC-M331HM (serv.man5) Service Manual ▷ View online
45
VC-M321HM
VC-M331HM
VC-M331HM
NO
FLOW CHART NO.20 PLAYBACK MODE TROUBLESHOOTING
Playback picture does not appear(E-E mode is possible).
Is there FM signal (approx.
0.4Vp-p) input in the pin(78)
of IC201?
Check line between pins(79)
and (78) of IC201.
NO
YES
NO
YES
NO
Is there luminance signal
(approx. 0.4Vp-p) output in the
pin(79) of IC201?
YES
YES
YES
YES
YES
YES
Is the supply V-H.SW.P.
signal fed to pin(81) of IC201?
NO
NO
NO
Is there luminance signal
(approx. 0.5Vp-p) input in the
pin(23) of IC201?
Check line between circuit of
pins(39) and (26) of IC201.
(C212)
Is CCD control voltage approx.5V applied normally to the pin(37) from pin(57) of IC201?
Is clock signal (approx. 8.86MHz <PAL mode>/0.5Vp-p) for CCD applied normally to the pin (44) from (69)
of IC201?
Is there luminance signal
(approx. 0.5Vp-p) output in
the pin(39) of IC201?
Check peripheral circuit of pins
(13), (14) and (17) of IC201.
S-PICTURE circuit (Q201-6).
NO
Is there luminance signal
(approx. 0.5Vp-p) input in the
pin(19) of IC201?
Check line between pins(18)
and (19) of IC201. (C206)
NO
Is there luminance signal
(approx. 0.3Vp-p) input in
the pin(42) of IC201?
Check line between pins(21)
and (24) of IC201. (C208)
NO
NO
YES
YES
NO
YES
YES
Is voltage of 5V applied to the
chroma power terminal pin(61)
of IC201?
Check peripheral circuit pin
(61) of IC201 and PC 5V line.
NO
Is there chroma signal(approx.
156mVp-p <PAL mode>
/burst) input in the pin(46)
of IC201?
Check line between pin(60)
and pin(46) of IC201. (C512)
NO
Is there chroma signal(approx.
197mVp-p <PAL mode>
/burst) input in the pin(58)
of IC201?
YES
Is there chroma signal(approx.
300mVp-p <PAL mode>
/burst) input in the pin(54) of
IC201?
For PAL/SECAM mode.
Check whether the pins(73)
and (75) of IC201 oscillate
4.43MHzat PAL/SECAM mode.
Check line between circuit of
pins(58) and (35) of IC201.
(R505, C515)
For PAL/SECAM mode.
Check parts around of X501.
YES
NO
Is there chroma signal(approx.
197mVp-p <PAL mode>
/burst) output in the pin(35)
of IC201?
Check line between circuit of
pins(55) and (54) of IC201.
(C514)
YES
Although picture playback is possible, colour does not
appear in PAL mode (E-E mode is possible).
Replace IC201.
Replace IC201.
Check V-H.SW.P. line.
Is voltage 5V applied to the CCD section power terminal at pin(36) of IC201?
Check line between circuit of pins(24) and (23) of IC201. (C210)
Is there luminance signal
(approx. 0.25Vp-p) input
output in the pins(13), (14)
and (17) of IC201?
Is there luminance signal
(approx. 0.5Vp-p) input in the
pin(26) of IC201?
46
VC-M321HM
VC-M331HM
VC-M331HM
YES
YES
YES
YES
NO
NO
NO
FLOW CHART NO.21 LINEAR SOUND MODE TROUBLESHOOTING(1)
Check line between pin(99) of IC201
and pin(21) of IC701.
Is there audio signal outputted at
pin(11) of IC201?
Check fh trap circuit. (Q601)
Does fh trap circuit operate
normally? (Q601)
Line output terminal :
Check line ranging from fh trap circuit to the audio output terminal.
RF output terminal :
Check line ranging from fh trap circuit to the audio input terminal of
tuner (TU1551).
NO
NO
NO
Is there audio signal inputted at
each input terminal of IC201 as
shown in table?
Beeper input terminal.
U/V tuner audio input
terminal.
Normal audio input
terminal.
pin(7)
pin(8)
pin(9)
Check line ranging from pin(97) of
IC701.
Check line ranging from IF circuit.
Check line ranging from ext. audio
input terminal.
Replace IC201.
Is there "L" level at pin(99) of IC201?
No E-E sound heard.
YES
YES
NO
NO
NO
NO
FLOW CHART NO.22 LINEAR SOUND MODE TROUBLESHOOTING(2)
Check the AUDIO MUTE (H) line
between pin(99) of
IC201 and
pin(21) of IC701.
Is there "L" level at pin(99) of IC201?
Is there a signal at pin(4) of IC201?
Replace IC201.
YES
YES
YES
NO
Check the bias oscillation circuit
(T651,Q651,Q652) and A-ERASE
BIAS CTL line.
Is there a signal(Bias+Audio sig.)
at pin(6) of T651?
Check the MH-AA harness and A/C
head.
Is the supply voltage of 12V fed to
pin(2) of T651?
Is there a signal(Bias) at pin(5) of
T651?
Check AT 12V line.
Check peripheral circuit of T651.
No linear sound recording
YES
YES
YES
YES
NO
NO
NO
NO
NO
FLOW CHART NO.23 LINEAR SOUND MODE TROUBLESHOOTING(3)
Are the MH-AA harness and the PB
AMP peripheral parts normal?
Check the AUDIO MUTE (H) line
between pin(99) of
IC6301 and
pin(21) of IC701.
Check fh trap circuit. (Q601)
Does fh trap circuit operate
normally? (Q601)
Clean A/C head.
YES
Is azimuth height of A/C head
properly adjusted?
YES
Replace A/C head.
Readjust azimuth hight.
Replace IC201.
Is there a signal at pin(100) of
IC201?
Is there "L" level at pin(99) of
IC201?
Is there a signal at pin(11) of
IC201?
YES
Check line ranging from ext. audio
output terminal.
No linear sound playback
47
VC-M321HM
VC-M331HM
VC-M331HM
FLOW CHART NO.24 DECODER TROUBLESHOOTING
SELECT
OUTPUT
INPUT SIGNAL
OUTPUT SIGNAL
<Normal Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SIG.
FLOW
INPUT
(switch)
FLOW
(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 audio input
→
pin36
pin1
pin35
→
E1(L1) audio output
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
E1 audio input
Pin11 of IC201(Audio output)
→
pin9
pin5
pin36
pin29
→
E2(L2) audio output
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 audio input
E1 audio input
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 10.5V line.
Check line between pins(25), (26)
of IC2501 and pins(17), (18) of
IC701.
Is there SDA and SCL signal
applied to pins(25) and (26) of
IC2501?
Is voltage 5V applied to the video
section power terminal at pins(15),
(17) of IC2501?
Is voltage 10.5V 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.
48
VC-M321HM
VC-M331HM
VC-M331HM
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
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
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")
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