Read Sharp DV-HR300H (serv.man8) Service Manual online
15
DV-HR300S/HR350S
DV-HR300H
DV-HR300X
DV-HR300H
DV-HR300X
Y/C/C
B
/C
R
output
Is video signal output to each pin of IC7506?
IC7506 pin 218 (R7743)
Y
OUT
(Q7506 pin 5 B)
IC7506 pin 214 (R7744) C OUT
(Q7505 pin 5 B)
IC7506 pin 245 (R7724) C
B
(B_U) OUT
(Q7503 B)
IC7506 pin 224 (R7737) C
R
(R_V) OUT
(Q7502 B)
FLOW CHART No.5
Playback video signal is not output from main PWB.
Is drive control of IC7506 working properly?
Is HDD control working properly?
YES
Check lines between pins of IC7506 and CN3001 as well as
circuits on lines.
IC7506 pin 218 (R7743)
→
Q7506
→
Q7509 (FL7501
→
Q7508 in LP
mode)
→
IC7512
→
Q7510
→
CN3001 pin 23 154_Y
IC7506 pin 214 pin (R7744)
→
Q7505
→
CN3001 pin 25 154_C
IC7506 pin 245 pin (R7724)
→
Q7503
→
CN3001 pin 19 154_B/U
IC7506 pin 224 pin (R7737)
→
Q7502
→
CN3001 pin 20 154_R/V
NO
NO
Refer to Flow chart No.2 "Drive is not working
properly (communication failure with IC7506)"
or Flow chart No.3 "HDD is not working
properly (communication failure with IC7506)".
Check IC7506 and peripheral circuits.
YES
Y/P
B
/P
R
output (progressive mode)
Is video signal output to each pin of IC7506?
IC7506 pin 223 (R7738)
Y
(G_Y) OUT
(Q7501 B)
IC7506 pin 245 (R7724) P
B
(B_U) OUT
(Q7503 B)
IC7506 pin 224 (R7737) P
R
(R_V) OUT
(Q7502 B)
NO
YES
Check IC7506 and peripheral circuits.
Check lines between pins of IC7506 and CN3001 as well as
circuits on lines.
IC7506 pin 223 pin (R7738)
→
Q7501
→
CN3001 pin 18 154_G/Y
IC7506 pin 245 pin (R7724)
→
Q7503
→
CN3001 pin 19 154_B/U
IC7506 pin 224 pin (R7737)
→
Q7502
→
CN3001 pin 20 154_R/V
Is video signal output to pins of main unit connector CN3001?
CN3001 pin 23 154_Y
CN3001 pin 25 157_C
FLOW CHART No.6
Playback images do not appear properly (from video/S output).
NO
Refer to Flow chart No.5 "Playback video
signal is not output from main PWB".
Check circuits and lines between pins of
main unit connector CN3001 and input pins
of IC2802.
CN3001 pin 23
→
S2202 pin 23
→
Q2502,
2504, 2507
→
IC2802 pin 2 OSD_Y_IN
CN3001 pin 25
→
S2202 pin 25
→
Q2501,
2503
→
IC2802 pin 4 OSD_C_IN
YES
NO
Check line from IC2501 pin 21 to S-OUTY
terminal (J2601).
Check IC2501 pin 23
→
IC2601 pin 7 (IN)
and output waveform of IC2601 pin 25.
Is video signal input to each pin of sub unit IC2802?
IC2802 pin 2 OSD_Y_IN
IC2802 pin 4 OSD_C_IN
YES
NO
Is 5V applied to IC2501 pins 1, and 28?
Is 5V applied to IC2802 pin 7?
Is IC2501 pin 3 at "H" level?
STNDBY_5V line
Check PC_5V (1)
line.
NO
NO
Is video signal output to each pin of IC2802?
IC2802 pin 8 OSD_Y
IC2802 pin 6 OSD_C
YES
Is video signal input to each pin of IC2501?
IC2501 pin 6 OSD_Y
IC2501 pin 2 OSD_C
YES
Is video signal output to each pin of IC2501?
IC2501 pin 21
Y_OUT
IC2501 pin 26 C_OUT
IC2501 pin 23 V_OUT
Check lines between pins of IC2802 and
IC2501.
IC2802 pin 8
→
IC2501 pin 6 OSD_Y
IC2802 pin 6
→
IC2501 pin 2 OSD_C
YES
NO
NO
NO
Is video signal output to each output terminal?
Are
Y
and C signals output to S-OUT
terminal (SC2603)?
Is video signal output to V
ideo-OUT
terminal (JC2601)?
Is video/Y
signal output to SCAR
T
L1 terminal?
NO
YES
ICheck or replace
IC2501.
YES
Check or replace
IC2802.
YES
YES
Is T_V_MUTE
line
at "L" level?
NO
Is voltage of 12V supplied to pin 14 of
IC2601 and 5V to pin 24?
Check or replace
IC2601.
YES
Check 12V line and
periphery of IC2691.
5V
→
STNDBY
.
Check 5V line.
NO
NO
Check Q2510 and
R2515.
Check T_V_MUTE
line.
NO
Check input waveform of IC2682 pins 4 and 6 and output of pin 2.
IC2501 pin 21
→
IC2682 pin 4
Y
OUT
IC2682 pin 6
→
IC2601 pin 25
IC2682 pin 2 output. When pin 1 is "H": Pin 4 input signal.
"L": Pin 6 input signal is output.
Is voltage of 5V supplied to IC2682 pin 3?
Check or replace IC2682.
YES
Check STNDBY
5V line.
NO
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