Sharp DV-HR300U Service Manual download pdf (Page 20)

DV-HR300U

YES

Check 1.5V line, 1.5VREG.IC3504 and peripheral circuits.

Check YCDEC_RST line.

Are D_3.3V (1) and A_3.3V applied to each pin

of IC3502?

Check D_3.3V (1) and A_3.3V lines.

Is 1.5V applied to each pin of IC3502?

YES

After power on, is IC3502 pin 84 YCDEC_RST

line at "L" level and changed to "H" level?

YES

Is 3.3V applied to each pin of IC3503?

Check D_3.3V (1) line.

YES

Is clock signal SDRCLK input to IC3503 pin 35?

Is digital data YC_656 [2-9] output to each pin of

IC3502?

IC 3502 pins 56, 58, 59, 61, 62, 64, 65 and 67

YC_656 [2-9]

Check SDRCLK line between IC3502 pin 17 and IC3503 pin 35.

Check IC3502 and peripheral circuits.

YES

Is video signal output to each pin of IC7506?

IC7506 pin 218 (R7742) Y (Q7506 pin 5 B)

IC7506 pin 214 (R7744) C (Q7505 pin 5 B)

IC7506 pin 245 (R7724) CB (B_U) (Q7503 B)

IC7506 pin 224 (R7737) CR (R_V) (Q7502 B)

Check IC7506 and peripheral circuits.

FLOW CHART No.10

Video signal recording is impossible.

YES

Is video signal output to each pin of CN3001?

CN3001 pin 23 154_Y

CN3001 pin 25 154_C

CN3001 pin 19 CB (154_B/U)

CN3001 pin 20 CR (154_R/V)

YES

Refer to Flow chart No.6/No.7 "Playback images do

not appear properly".

Check lines between pins of IC7506 and CN3001 as well as circuits

on lines.

IC7506 pin 218 (R7742) → Q7506 → Q7509 → IC7512 →

CN3001 pin 23 154_Y

IC7506 pin 214(R7744) → Q7505 → CN3001 pin 25 154_C

IC7506 pin 245 (R7724) → Q7503 → CN3001 pin 19 154_B/U

IC7506 pin 224 (R7737) → Q7502 → CN3001 pin 20 154_R/V

Is E-E signal output?

YES

Are drive controls of IC7506 and HDD working

properly?

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)".

YES

Is digital data input to each pin of IC7304?

IC7304 pins 16-23 VDI_656 [0-7]

YES

Is 81MHz clock signal MMCLK output to IC7304 pin

118?

Check IC7304 and peripheral circuits.

YES

Is 81MHz clock signal MMCLK output to pin 38 of

IC7306 and 7307?

Refer to Flow chart No.4 "Recording is impossible

(MPEG stream check)".

Check MMCLK lines between IC7304 pin 118 and pin 38 of

IC7306 and 7307.

YES

Refer to Flow chart No.9 "Image E-E does not appear".

Check digital data lines between pins of IC3507 and IC7304.

IC3507 pins 11-18 → IC7304 pins 16-23 VDI_656 [0-7]

Are signals VIDICLK, VIDIHD and VIDIVD input to

each pin of IC7506?

IC7506 pin 184 VIDICLK, pin 177 154_VIDIHD, pin

178 154_VIDIVD

Check VIDICLK, VIDIHD and VIDIVD lines.

YES

Is digital data VDI_656 [0-7] input to each pin of

IC7506?

IC7506 pins 194, 186, 187, 188, 189, 181, 182 and

183 VDI_656 [0-7]

YES

Check lines between pins of IC3502 and IC7506 as well as circuits

on lines.

IC 3502 pins 56, 58, 59, 61, 62, 64, 65 and 67 → IC3507 → IC7506

pins 194, 186, 187, 188, 189, 181, 182 and 183

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 75 76

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Sharp DV-HR300U Service Manual Page 20

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