Sharp BD-HP21H (serv.man2) Service Manual ▷ View online
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 16
The LED mode display indicator fails to light up.
* White LED: Blinking while the disc is being loaded.
* White LED: Blinking while the disc is being loaded.
Lights up when the disc has been recognized.
* Blue LED:
While the disc is being played back.
* White LED: When the quick start has been preset.
Is the "H" potential applied at the bases of Q1101 thru Q1104,
Q1106 and Q1107 according to the modes?
Q1106 and Q1107 according to the modes?
NO
NO
Check the line between SC1102 and the base of each transistor.
Is there the "H" potential output at the following pins according
to the modes: Pin (54), (LED_BD_MODE), pin (57)
(LED_DVD_MODE), pin (55) (LED_BD_MODE), pin (58)
(LED_DVD_PLAY) and pin (52) (LED_QUICK_START), all on
IC2504?
to the modes: Pin (54), (LED_BD_MODE), pin (57)
(LED_DVD_MODE), pin (55) (LED_BD_MODE), pin (58)
(LED_DVD_PLAY) and pin (52) (LED_QUICK_START), all on
IC2504?
Check IC2504 and its peripheral circuits. Or replace IC2504
as required.
as required.
Check the line between IC2504 and P2503.
YES
Is there the "H" potential at the following pins according to the
modes: Pin (3), (LED_BD_MODE), pin (4) (LED_BD_PLAY),
pin (5) (LED_DVD_MODE), pin (6) (LED_DVD_PLAY) and
pin (7) (LED_QUICK_START), all on SC1102?
modes: Pin (3), (LED_BD_MODE), pin (4) (LED_BD_PLAY),
pin (5) (LED_DVD_MODE), pin (6) (LED_DVD_PLAY) and
pin (7) (LED_QUICK_START), all on SC1102?
YES
Check each transistor, LED and the current-limiting resistor.
YES
NO
Is there the "H" potential at the following pins according to the
modes: Pin (3), (LED_BD_MODE), pin (4) (LED_BD_PLAY),
modes: Pin (3), (LED_BD_MODE), pin (4) (LED_BD_PLAY),
pin (5) (LED_DVD_MODE), pin (6) (LED_DVD_PLAY) and
pin (7) (LED_QUICK_START), all on P2503?
Check the line between P2503 and SC1102.
YES
NO
FLOW CHART No.5
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 17
A key fails to work.
Is the key switch contact and tightness as specified?
YES
YES
Check the line between each button and IC2504.
Or check the pull-up resistor at pin (63, 74 or 75) of IC2504.
(R2578, R2507, R2672)
Check the circuits that generate the control voltages.
Or check the pull-up resistor at pin (63, 74 or 75) of IC2504.
(R2578, R2507, R2672)
Check the circuits that generate the control voltages.
Is the control voltage properly applied at pin (74) (KEY_EJCT),
pin (75) (KEY_STBY), pin (63) (KEY_DOOR), pin (94)
(KEY_OPC1) or pin (95) (KEY_OPC2), all on IC2504?
* While the POWER, DOOR OPEN/CLOSE, TRAY OPEN/
pin (75) (KEY_STBY), pin (63) (KEY_DOOR), pin (94)
(KEY_OPC1) or pin (95) (KEY_OPC2), all on IC2504?
* While the POWER, DOOR OPEN/CLOSE, TRAY OPEN/
CLOSE or relevant button is held down, the "H" level
changes to "L" level.
Pins (63, 74 and 75) of IC2504
changes to "L" level.
Pins (63, 74 and 75) of IC2504
* PB, STOP, SKIP- and SKIP+ buttons
Press each of these buttons and make sure the voltages
shown in Fig. 1 are applied to the related pins of IC2504.
shown in Fig. 1 are applied to the related pins of IC2504.
NO
Check the relevant switch. Replace it as required.
NO
Check IC2504 and its peripheral circuits. Or replace IC2504
as required.
as required.
FLOW CHART No.6
Fig. 1
KEY_OPC1 KEY_OPC2
PLAY
SKIP+
SKIP-
STOP
0V
0.73V
1.76V
2.25V
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 18
The door fails to open and close.
Are the cables from the panel inserted in the specified plugs?
YES
YES
Is the DOOR position detection signal in the state listed below?
Check the line between pin (3) of CN2507 and pin (50) of IC2504.
Or check the cables and detection PWB for poor connection.
Or check the cables and detection PWB for poor connection.
Is the control signal outputted, as required, from pin (48)
(PNL_CLOSE) and pin (49) (PNL_OPEN) of IC2504?
(PNL_CLOSE) and pin (49) (PNL_OPEN) of IC2504?
Check the door opening/closing motor.
Replace the motor as required.
Replace the motor as required.
Check IC2504 and its peripheral circuits. Replace IC2504 as
required.
required.
NO
Is pin (50) (PNL_DET) of IC2504 at "L" potential?
NO
2-pin connector (for opening/closing motor): CN2508
4-pin connector (for door position detection): CN2507
4-pin connector (for door position detection): CN2507
NO
YES
Is the specified voltage supplied to pin (63) of IC2504?
FLOW CHART No.6
NO
YES
NO
Check the detection switch.
FLOW CHART No.7
IC2504
CLOSE
OPEN
OPEN_DET_SW
69pin
H
H
L
CLOSE_DET_SW
68pin
L
H
H
BD-HP21U/S/H/A/X/RU/SB,BD-HP50U/X
2 – 19
The RS232C interface fails to control the system.
Is the control signal being sent from the PC inputted via pin (2)
of SC4701?
of SC4701?
YES
YES
Check IC2504 and its peripheral circuits as well as the power supply
line. Replace as required.
line. Replace as required.
Check the line between pin (2) of SC4701 and pin (8) of IC4701.
Is the signal inputted to pin (36) of IC2504?
Is the signal outputted from pin (37) of IC2504?
Check the line between pin (9) of IC4701 and pin (36) of IC2504.
NO
NO
Check the line between pin (11) of IC4701 and pin (37) of IC2504.
NO
Is the signal inputted to pin (8) of IC4701?
NO
Check the cable and the PC settings.
NO
YES
Is the signal outputted from pin (9) of IC4701?
Check IC4701 and its peripheral circuits as well as the power supply
line. Replace as required.
line. Replace as required.
NO
YES
Is the signal inputted to pin (11) of IC4701?
YES
YES
NO
Is the signal outputted from pin (13) of IC4701?
YES
NO
Is the signal inputted to pin (3) of SC4701?
YES
Check the cable or replace SC4701.
Check IC4701 and its peripheral circuits as well as the power supply
line. Replace as required.
line. Replace as required.
Check the line between pin (3) of SC4701 and pin (13) of IC4701.
FLOW CHART No.8 (HP50U only)
* Signal level
IC4701
ЊSC4701㧦
INPUT
"L"
㧦-15V㨪-3V
OUTPUT
"L"
㧦-5.4V
"H"
㧦5.4V
IC4701
ЊIC2504㧦
"L"
㧦0V
"H"
㧦5V
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