Sharp VC-M313 (serv.man14) Service Manual ▷ View online
45
FLOW CHART NO.21 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.
YES
YES
NO
NO
NO
NO
FLOW CHART NO.19 LINEAR SOUND MODE TROUBLESHOOTING(1)
Check the AUDIO MUTE (H) line
between pin(99) of IC6301 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
NO
Check the bias oscillation circuit
(T651,Q651,Q652) and A-ERASE
BIAS CTL line.
Check AT 12V line.
Check peripheral circuit of T651.
No linear sound recording(Hi-Fi E-E mode is possible)
Is the supply voltage of 12V fed to
pin(2) of T651?
YES
Is there a signal(Bias) at pin(5) of
T651?
Is there a signal(Bias+Audio sig.)
at pin(6) of T651?
Check the MH-AA harness and A/C
head.
YES
YES
YES
YES
NO
NO
NO
NO
NO
FLOW CHART NO.20 LINEAR SOUND MODE TROUBLESHOOTING(2)
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 line between pin(11) of
IC201 and pin(54) of IC6301.
For Hi-Fi models :
Is there audio signal inputted at
pin(54) of IC6301?
Except Hi-Fi models :
Check line ranging from ext. audio
output terminal.
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?
No linear sound playback(Hi-Fi E-E mode is possible)
46
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 J39, 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.
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.
JP27 JP26 JP25 JP24
1
1
0
0
↓
C
JP23 JP22 JP21 JP20
0
0
0
0
↓
0
0
JP19 JP18 JP17 JP16
0
0
0
0
↓
0
0
JP15 JP14 JP13 JP12
0
1
0
0
↓
4
4
JP11 JP10 JP9 JP8
0
0
1
1
↓
3
3
JP7 JP6 JP5 JP4
0
0
0
0
↓
0
0
JP3 JP2 JP1 JP0
0
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
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
display tube, referring to the E
2
PROM map.
Out lights
blank
LP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
LP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP n
∗
∗
↑
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")
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
0
JP35 JP34 JP33 JP32
0
0
0
0
↓
1
1
JP31 JP30 JP29 JP28
0
0
0
0
↓
0
0
47
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~J39, 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
n : NTSC
↓
p : PAL
Tape speed
→
LP or EP
n
∗
∗
↑
↑
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.
48
ROM MAP
MODEL
blank
blank
EP n * *
NTSC Luminance level
EP n * *
NTSC Chrominance level
SP n * *
NTSC Luminance level
SP n * *
NTSC Chrominance level
LP p * *
PAL Luminance level
LP p * *
PAL Chrominance level
blank
blank
SP p * *
PAL Luminance level
SP p * *
PAL Chrominance level
"0"
fixed
JP39
A.DUB
JP38
NOT SLOW ATR
JP37
SQ PB
JP36
NTSC PB
JP35
NTSC SKEW
JP34
HEAD2
JP33
HEAD1
JP32
HEAD0
JP31
GAMMA correction
JP30
L/P - 5 min
JP29
84 CHANNEL
JP28
R/C CODE 1
JP27
DNR
JP26
POST CODE
JP25
SAT CTL
JP24
AV LINK / 16 X 9
JP23
Hi-Fi
JP22
SORT/CLOCK
JP21
DECODER
JP20
SURROUND
JP19
IGR
JP18
NICAM
JP17
G-CODE1
JP16
G-CODE0
JP15
OEM
JP14
LP mode
JP13
F-AV
JP12
2 SCART
JP11
RF OUT
JP10
TUNER2
JP 9
TUNER1
JP 8
TUNER0
JP 7
SYSTEM1
JP 6
SYSTEM0
JP 5
SAT CH VPS OFF X380 FF/REW
JP 4
LOW POWER
JP 3
SPATIALIZER
JP 2
VPS/PDC
JP 1
COLOUR 1
JP 0
COLOUR 0
DISPLAY IN HEXADECIMAL
NOTATION
DISPLAY IN HEXADECIMAL
NOTATION
0:LIGHT UP
1:FLASHING
VC-M303HM
VC-M313HM
---
---
0
0
7
7
0
0
7
7
3
3
4
4
---
---
3
3
4
4
---
---
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
1
1
0
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
070734
34010
0004300
34010
0004300
070734
34010
0036300
34010
0036300
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