Read Sharp DV-HR480H (serv.man2) Service Manual online
18
DV-HR400S/H
DV-HR450S
DV-HR480S/H
FLO
W CHAR
T No.2
Drive is not working properly (communication failure with IC7508).
Is
A
T
API reset released? (CN4502 pin 1 R4540: RESET_"H" level)
NO
Check IC7508 and peripheral
circuits.
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 37 CS0 and pin 38 CS1 are at "L"
level. (Communication is ongoing if intermittently set at LOW
.)
CN4502 pin 35 DA0, pin 33 DA1, pin 36 DA2 and
A
T
API register
address (Intermittently set at LOW).
CN4502 pin 31 INTRQ is at "H" level when drive interrupts. Output
after processing transfer command from IC7508, etc.
CN4502 pin 21 DMARQ is at "L" level when drive requests data
transfer
.
CN4502 pin 29 DMACK is at "L" level when IC7508 receives data
transfer for DMARQ from drive.
When CN4502 pin 25 DIOR and pin 23 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 drive?
NO
Check lines between pins of IC7507 and IC7508.
FLO
W CHAR
T No.1
With power on, circuits on main PWB do not work properly
.
Power turns of
f approx. 5 seconds after turned on.
NO
NO
Are voltages of 3.3V (VDD3.3,
A
VDD),2.5V
(VDD2) and 1.5V(VDD1,PVDD) applied to
pins of IC7508?
After power on, is EMMA2_RST
signal ("H"
→
"L" when reset) input to IC7508 pin 283?
YES
Reset
Check
Is Q7512 base (BOOTSEL1) at "L" level and
IC7508 pin 232 at "H" level?
YES
Is serial communication established between
IC7508 and sub unit IC501?
IC7508 pin 286 CSISDIN (SUBMIC_D_OUT)
IC7508 pin 123 FPCSTB (SUBMIC_CS)
IC7508 pin 287 CSISCK (SUBMIC_CLK)
IC7508 pin 122 CSISDOUT
(SUBMIC_D_IN)
YES
NO
NO
NO
NO
Is reset signal ("H"
→
"L" when reset) input to
pins of each IC?
IC3502 pin 84
YCDEC_RST
IC4007 pin 13,14 DV
AD RST
IC4004 pin 1394_RST
IC3009 pin 5 DA_RST
IC3005 pin 13
AD_RST
NO
With power on, is fan running?
Fan is defective or power supply failure.
Check D_3.3V (1) and pc_1.5V (IC7503) lines.
Check IC7508 and peripheral
circuits.
Check line between IC501 pin 98 (MAIN CPU_RST)
→
Q3001,Q3002
→
IC7508
pin 283(EMMA2_RST).
Check BOOTSEL1 (DOWN L
[H]) line between IC501
pin 22 and Q7512 base as well as line between Q7512
collector and IC7508 pin 232.
Check lines between pins of IC7508 and sub PWB
IC501.
IC7508 pin 286
←
IC501 pin 16
TU_D_OUT
IC7508 pin 123
→
IC501 pins 2, 3
TU_CS
IC7508 pin 287
→
IC501 pin 14
TU_CLK
IC7508 pin 122
→
IC501 pin 15 MAIN_DA
T
A
YES
With power on, is data input to IC7508 pins 91,
178,179,258,259,260,261 and 332.
RDA
T
A
[7:0]?
YES
Is 27MHz clock signal input to pins of the
following ICs?
IC7508 pins 79,132,215,216,217 27MHz_OSC
IC4004 pins 50, 202 INVCK4
Check lines between pins of IC7508 and other ICs.
IC7508 pin 32
→
IC3502 pin 84
YCDEC_RST
IC7508 pin 204
→
IC4007 pin 13,14 DV
AD RST
IC7508 pin 205
→
IC4004 pin 1 1394_RST
IC7508 pin 24
→
IC3009 pin 5 DA_RST
IC7508 pin 23
→
IC3005 pin 13
AD_RST
NO
YES
YES
NO
Check X3001 and peripheral
circuits.
Is 27MHz clock signal output to X3001 pin 4?
NO
Check X3502 and peripheral circuits.
Check lines between pins4 of X3001 and other ICs.
X3001 p
in
4
→
IC7508 pins 79,132,215,216,217
27MHz_OSC
X3001
pin 4
→
IC4004 pins 50, 202 INVCK
NO
YES
YES
Is 133MHz clock signal DDR DCK DDRDCKB
input to IC4602,4603 pin 45,46?
Is 24.576MHz clock signal output on IC3502
pin 43?
Check IC7508 and peripheral circuits.
Is 133MHz clock signal output to IC7508 pin 138,
300?
Check lines between IC7508 pin 138,300 and
IC4602,4603 pin 45,46.
NO
YES
Clock
Check
Clock
Check
Is reset signal ("H"
→
"L" when reset) output to each
pin of IC7508?
IC7508 pin 32
YCDEC_RST
IC7508 pin 204 DV
AD RST
IC7508 pin 205 1394_RST
IC7508 pin 24 DA_RST
IC7508 pin 23
AD_RST
NO
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