Sharp VC-M314 (serv.man2) Service Manual ▷ View online
51
VC-M314HM
VC-MH834HM
VC-MH834HM
YES
YES
NO
NO
FLOW CHART NO.21 Hi-Fi SOUND MODE TROUBLESHOOTING(1) (For Hi-Fi model)
Check line ranging from pins (31),(30) of
IC1701 (NICAM/GR), to the each input
terminal of IC2501.
Check PC 5V and Hi-Fi 9V lines.
Is the supply voltage of PC 5V fed to pins(14),
(30),(36) and 9V fed to pin (60) of IC6301?
No Hi-Fi E-E sound heard
Is there audio signal inputted at each input
terminal as shown in table?
T
uner input terminal.
IC2501 IC2501
pin(16) pin(15)
Decoder signal input
terminal.
Check line ranging from pins (39),(40) of
IC2501 (decoder circuit) or audio input
terminal to the each input
terminal of IC6301.
Are there the serial data and clock at pins
(31) and (32) of IC6301?
Check line between pins (31),(32) of IC6301
and pins (26),(27) of IC701?
Check line between pins (4,46)and (5,45) of
IC6301. (C6302,C6320)
Is there audio signal outputted at pins (4),
(46) of IC6301?
Is there audio signal outputted at pins (5),
(45) of IC6301?
YES
NO
NO
Is there audio signal inputted at each input
terminal of IC201 as shown in table?
U/V tuner audio input terminal. pin(8)
Aux input terminal pin(9)
Is there audio signal outputted at pins (1
1),
of IC201?
Is there audio signal outputted at pin (54)
of IC6301?
NO
NO
NO
NO
NO
Check line ranging from
A-out pin (21),of
TU1401
Check line ranging from pin (53) of IC6301.
Line output terminal : Is there audio signal outputted at pins (58) and (56) of IC6301?
Replace IC201.
Is there "L" level at pin(99) of IC201?.
Check line between pin (8) of IC6301 and
pin (21) of IC701.
Check line between pin (1
1) of IC201 and
pin (54) of IC6301
YES
NO
Is there "L" level at pin(8) of IC6301?.
Check line between pin (8) of IC6301 and
pin (21) of IC701
Replace IC6301.
YES
YES
YES
YES
YES
NO
NO
Line output terminal
Check line ranging from pins (58) and (56) of IC6301 to pins (2) and (1) of IC2501.
<For Hi-Fi mode>
<For normal mode>
IC6301 IC6301
pin(61) pin(52)
52
VC-M314HM
VC-MH834HM
VC-MH834HM
YES
YES
NO
NO
FLOW CHART NO.22 Hi-Fi SOUND MODE TROUBLESHOOTING(2) (For Hi-Fi model)
NO
YES
Replace IC6301.
Is there a REC FM signal outputted
at the IC6301 pins(26) to (22) (CH-1)
/pins (26) to (25)(CH-2).
Check PC 5V lines.
Check the record current setting
resistor R352 and pin (27) of IC6301.
YES
No HI-FI sound recording(E-E mode is posible).
Check peripheral circuit of IC6301 as
shown in table.
L-ch pins (41),(40),(39),(38),(37)
R-ch pins (10),(1
1),(12),(15),(16)
Check AH-MZ
harness.
Check or replace the cylinder
.
Is the supply voltage of 5V fed to pin
(20) of IC6301?
Is there "L" level at pin (33) of IC6301?
NO
NO
YES
NO
FLOW CHART NO.23 Hi-Fi SOUND MODE TROUBLESHOOTING(3) (For Hi-Fi model)
NO
YES
Replace IC6301.
Is there playback envelope signal out
putted at pins(19) to (18) of IC6301?
Check PC 5V lines.
Is there
A-H.SW
.P
. signal at
pin (35) of IC6301?
YES
No HI-FI sound playback(E-E mode is possible).
Check peripheral circuit of IC6301 as
shown in table.
L-ch pins (41),(40),(39),(38),(37)
R-ch pins (10),(1
1),(12),(15),(16)
Is the supply voltage of 5V fed to pin
(20) of IC6301?
NO
Check the
A-H.SW
.P
. line between
pin (35) of IC6301 and pin (28) of IC701
Replace IC 6301
Is there audio signal inputted at input
terminal as shown in table?
Decoder or aux signal input terminal.
Pin (9) of IC201
Front
A/V signal input terminal.
Pin (1
1) of IC2501 (DECODER) or Front
A/V
signal input terminal pin(7) of IC201.
Is there audio signal outputted at pin (1
1)
of IC201? (DECODER)
Does the trap circuit operate normally?
NO
NO
NO
Check line ranging from pin (39) of IC2501
(DECODER) or from SCAR
T
input terminal.
Check line ranging from Front
A/V input
terminal (J2101).
Line output terminal : Is there audio signal
inputted at pins (2) of IC2501?
Check PC 5V lines.
Is there "L" level at pin(99) of IC201?
Check
AUDIO MUTE (H) line between pin
(99) of IC201 and pin (21) of IC701.
Check line between IC2501 peripheral and
output terminal peripheral.
Check the trap circuit. (Q601,Q602).
YES
YES
YES
YES
YES
No E-E sound
FLOW CHART NO.24 LINEAR SOUND MODE TROUBLESHOOTING(1) (For MONO model)
Is there audio signal outputted at pins (42),
and (30) of IC2501?
Is the supply voltage of 5V fed to pin (96)
of IC201?
YES
NO
NO
Check peripheral circuit.of IC2501.
YES
NO
YES
YES
T
o
Output
T
erminal
NO
Check line between Q601, Q602 of
IC 201 and
Audio Output
T
erminal.
For Single SCART MONO
53
VC-M314HM
VC-MH834HM
VC-MH834HM
FLOW CHART NO.25 LINEAR SOUND MODE TROUBLESHOOTING(2) (For Hi-Fi and MONO model)
No linear sound recording (E-E mode is possible)
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?
Replace 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
A-ERASE CTL
line.
Is "L" level applied at pin(99) of
IC201?
Check peripheral circuits of
T651.
Check the MH-AA
harness and
A/C
head.
Is there signal (Bias +
Audio sig)
at pin (6) of
T651?
YES
YES
NO
FLOW CHART NO.26 LINEAR SOUND MODE TROUBLESHOOTING(3) (For Hi-Fi and MONO model)
Is there signal at pin (100) of IC201?.
Are there MH-AA
harness and the PB
AMP
peripheral parts normal?
No linear sound playback (E-E mode is possible)
NO
Is the azimuth height of
A/C head properly
adjusted?
Check the
AUDIO MUTE (H) line between
pin (99) of IC201 and pin (21) of IC701.
NO
Is there "L" level at pin (99) of IC201.
Is there signal at pin (1
1) of IC201.
YES
YES
Replace IC201.
Clean A/C
head.
Replace A/C
head.
Replace IC201.
Re-adjust azimuth.
NO
YES
YES
YES
YES
P
A
L
EP
ONL
Y
Are there signal at pin(1) of
IC 681?
YES
NO
Hi-Fi model ONL
Y
Is there audio signal inputted at
pin(54) of IC6301?
Check line between pin(1
1) of IC201
and pin(54) of IC6301.
54
VC-M314HM
VC-MH834HM
VC-MH834HM
YES
YES
NO
NO
NO
NO
YES
FLOW CHART NO.27 NICAM/IGR TROUBLESHOOTING (For Hi-Fi model)
NO
NO
YES
YES
YES
YES
YES
Is 5V supplied at pins(1
1),(19),(1) of
IC1701?
Check PC 5V line.
Is MPX 8V supplied at pin(33) of IC1701?
Check the REG. circuit of D9905.
Check PC Motor 12V line.
Check peripheral circuit of IC1701.
Replace IC1701.
Check peripheral circuit of X1701.
Is there a NICAM/IGR audio signal
at pins(31), (30) of IC1701?
Is there a NICAM/IGR audio signal
at pin(15),(16) of IC2501?
YES
YES
Check peripheral circuit of
TU1401.
Check between SIF OUT
of
TU1401
and pin(2) of IC1701.
Check serial data and clock at
pin(12) and (13) of IC1701.
Is there oscillated 18.432MHz at
pins(5), (6) of IC1701?
No NICAM/IGR sound.
Is there a base band signal at
pin(2) of IC1701?
Is there a base band signal at SIF
OUT
of
TU1401?
Check line between pin(39), (40) of
IC2501 and pins(52), (61) of IC6301.
Check between IIC Data
pins(26),(27) of IC701 and
pins(12),(13) of IC1701.
NO
NO
See Flow Chart No.21 Hi-Fi SOUND
MODE TROUBLESHOOTING
(1)
For Hi-Fi model
Click on the first or last page to see other VC-M314 (serv.man2) service manuals if exist.