Dvd-Video / Audio; Gu-3495 Audio P.w.b.; No Sound Or Noise Generated At Audio Output Terminal; Does Not Output Digital Output Signal - Denon DVD-2900 Service Manual

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(3) DVD-VIDEO / AUDIO

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Check DVD digital data output.
• [IC101]: [DATA(1--3)], [LRCK], [BCK]
O.K.
Check Bus-manager output.
• [IC201]: [MELD(0--2)], [MELWS],
[MELBCK]
O.K.
Check audio select output.
[DAD0-2)], [DAWS], [DABCK], [MCLK]
O.K.
Continues to the Check process of GU-3495 AUDIO P.W.B..
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L 13942296513

2. GU-3495 AUDIO P.W.B.

2.1. No sound or Noise generated at audio output terminal.

(1) Check Audio Output terminal, then Input pin of ICs.
• FL, FR
CNT,SW
• SL, SR
(2) Check MUTE Circuit and Transistors.
• Check MUTE circuit
2.2. Does not output Digital output signal(DOUT).
Check belows
[IC201], [IC202]
[T201]
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N.G.
N.G.
N.G.
IC206 Audio input check
IC209 Audio input check
IC212 Audio input check
Check Transistors
(TR217--TR220, TR211--TR226)
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8
Check soldering
• [IC101]: 159--170pin check.
• [IC201]: 46--71pin check.
(1)Check power supply voltage.
• [IC201]: +3.3V_D1, +2.5V_D1
(2)Check clock oscillation.
• [IC201]: (X103) 12.288MHz O.K.?
(3)Check control signal
• [IC201]: [DSPRST], [HDIN], [HDOUT], [HCLK],
[INTRPT], [HCS] O.K.?
(4)Check communication.
• [IC201]--[IC202](P-ROM)
(5)Check soldering.
• [IC203]
Check soldering
• [IC204]--[IC207]
• [CX271]
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See attached sheet waveform (Page 115
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DVD-2900
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