Read Sharp DV-HR400H (serv.man2) Service Manual online
19
DV-HR400S/H
DV-HR450S
DV-HR480S/H
FLO
W CHAR
T No.3
HDD is not working properly (communication failure with IC7508).
Is
A
T
API reset released? (CN4502 pin 40 R4566: "H" level)
NO
Check IC7508 and peripheral
circuits.
YES
YES
Check following items.
NO
Check power unit and PC_12V
and PC_5V circuits.
Communicating with drive via
A
T
API?
Access drive when CN4501 pin 4 CS0 and pin 3 CS1 are at "L"
level. (Communication is ongoing if intermittently set at LOW
.)
CN4501 pin 6 DA0, pin 8 DA1, pin 5 DA2 and
A
T
API register
address (intermittently set at LOW).
CN4501 pin 10 INTRQ is at "H" level when drive interrupts. Output
after processing transfer command from IC7508, etc.
CN4501 pin 20 DMARQ is at "L" level when drive requests data
transfer
.
CN4501 pin 12 DMACK is at "L" level when IC7508 receives data
transfer for DMARQ from drive.
When CN4501 pin 16 DIOR and pin 18 DIOW are at "L" level,
IC7508 sends READS/WRITE to drive. (Communication is ongoing
if CS and DA
are intermittently set at LOW
.)
Are 12V and 5V applied to HDD?
YES
Is the EE signal appear?
FLO
W CHAR
T No.4
Recording is impossible
NO
Check Flow Chart No.9 "Image EE does not
appear".
YES
Is video signal output to pins of main unit connector CN3001?
CN3001 pin 25 _Y
CN3001 pin 27 _C
CN3001 pin 24 _V
FLO
W CHAR
T 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".
YES
Check line from IC2501 pin 21 S-Y_OUT
,
pin 26 S-C_OUT
to terminal (SC2603).
Check IC2501 pin 23
→
IC2601 pin 7 (IN)
and output waveform of IC2601 pin 25.
Is 5V applied to IC2501 pins 1, and 28?
Is IC2501 pin 3 at "H" level?
Check STNDBY_5V line
NO
NO
Is video signal input to each pin of IC2501?
IC2501 pin 6 SD_SY
IC2501 pin 2 SD_SC
IC2501 pin 4 SD_V
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 CN3001 and
IC2501.
CN3001 pin 25
→
CN2202 pin 25
→
IC2501
pin 6 SD_SY
CN3001 pin 27
→
CN2202 pin 27
→
IC2501
pin 2 SD_SC
CN3001 pin 24
→
CN2202 pin 24
→
IC2501
pin 4 SD_V
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 (J2602)?
Is video/Y
signal output to SCAR
T
L1 terminal?
NO
YES
ICheck or replace
IC2501.
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
Check Q2516.
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
IC7508 pin 236 (Q7506 B)
Y
(V
A
Y
)
IC7508 pin 235 (Q7505 B) C (V
AC)
IC7508 pin 62 (Q7501 B) G/Y
(V
AG)
IC7508 pin 153 (Q7503 B) B/U (V
AB)
IC7508 pin 61 (Q7502 B) R/V (V
AR)
FLO
W CHAR
T No.5
Playback video signal is not output from main PWB.
Is drive control of IC7508 working properly?
Is HDD control working properly?
Check lines between pins of IC7508 and CN3001 as well as
circuits on lines.
IC7508 pin 236
→
Q7506
→
CN3001 pin 25_Y
IC7508 pin 235
→
Q7505
→
CN3001 pin 27_C
IC7508 pin 62
→
Q7501
→
CN3001 pin 20_G/Y
IC7508 pin 153
→
Q7503
→
CN3001 pin 21_B/U
IC7508 pin 61
→
Q7502
→
CN3001 pin 22_R/V
NO
NO
Refer to Flow chart No.2 "Drive is not working
properly (communication failure with IC7508)"
or Flow chart No.3 "HDD is not working
properly (communication failure with IC7508)".
Check IC7508 and peripheral circuits.
YES
YES
Is video signal output to each pin of IC7508?
Is there no problem with the digital data output from IC7508 to
HDD and DVD writer?
NO
Check Flow Chart No.2 and No.3
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