SHARP DV-S1U
Service Manual

FLOW CHART NO.4 When the output voltage fluctuates. Does secondary side photo coupler Check circuit and replace the parts. No operate normally? (IC1001, IC1006, D1048, D1015, etc.) See FLOW CHART No.3 <The fuse blows out.> operate normally? (IC1001, IC1012, D1024, etc.) Yes

FLOW CHART NO.1 The power cannot be turned on.(1) No

Is fuse normal? Replace the fuse. Yes

Yes Does primary side photo coupler No Check circuit and replace the parts.

Is normal state restored when once unplugged Check for lead or shor-circuiting of primary No Replace IC1001. power cord is plugged again after several seconds. circuit component? No D1011, T1001, C1003, C1005, etc.) Is EV 5V line voltage normal? When buzz is heard from the vicinity of power circuit. No

Yes (Q1001, Q1003, D1001, D1002, D1004, D1005, FLOW CHART NO.5

Yes

Is the voltage 12V, EV -30V and filament Check each rectifying circuit of secondary circuit. Check for short-circuiting diode and in each rectifying circuit of secondary side. voltage normal? (D1003, D1030, D1008, D1009, D1013, D1016, Q1002, IC1002, Q1007, Q1010, Q1011, Q1014, Q1004, etc.)

NO.2 FLOW CHART NO.6 The power cannot be turned on.(2) The fluorescent display tube does not light. Yes No Does the change from STANDBY LED indicate Yes No

Is supply voltage of fed to pin(6) and pin(24) Check the EV 5V line. turn-off? of IC2001? Check the EV 3.3V line. No Yes No No Is there 500kHz oscillation at pin(26) of IC2001? Check R2001, IC2001 and their periphery. Check the SW2008 and POWER button line. Yes No the signal lines of DA, CK, FIP CS Check or replace IC2001 and IC601. when POWER button activated on the remote Check line between the remote control of IC2001 and IC601? receiver and the pin(125) of IC601.

Yes

TROUBLESHOOTING

1-8-1
Replace IC601. (38), (39) of the fluorescent display tube? and Q2025. Also negative voltage applied between these pins and GND? The STANDBY LED indicate is flashing after 0.5 sec. No damages such as crack. Pin(207) of IC601? No Is switch contact and installation state normal? Replace key switch. (7), (8), (9), (10) of IC2001?

Is the supply voltage of 3.3V fed to Q2021? Is supply voltage fed to pin(15) of Check the -FL -24V line.

Yes IC2001?

Is supply voltage 5V fed to pin(3) of IC2001? Check the IC2001.

Yes

Is the "H" signal inputted at base of Q2021, when POWER button activated on the DVD?

Yes No

Is the "H" signal inputted at base of Q2021,

control unit? Yes No

Yes Are filament voltage applied between (1), (2) Check the power circuit, D1017, Q2023, Q2024

Are "P-CON-H" pulse outputted from the Replace IC601. and its periphery? Check that the fluorescent display tube is free from

Yes (below, confirmed operating at LED turn-off of 0.5 sec. interval.) Yes No

Yes FLOW CHART NO.7

Is P-CON switch circuit operated normally? Check each component and if poor the replace. The key operation is disabled. (Q1002, Q1005, Q1006, IC1002, D1036, D1046)

No

FLOW CHART NO.3 Yes The fuse blows out. Is control voltage normally into the pins(3), (4),

Is there leaking or short-circuited primary Check for short-circuiting of rectifying diode and component? in each rectifying circuit of secondary side.

E56A0TS