Does Not Read Disc; Disc Does Not Rotate; Cd Check Process; Dvd Check Process - Denon DVD-2910 Service Manual

1.3. Does not Read Disc

[No Play], [00 00] displayed etc.

(1) Disc does not Rotate.

Check the Emission of Pick-up.
GU-3612 (MAIN UNIT)
• Emission of P.U. laser O.K.?
• See attached sheet laser current check.
O.K.
Check Spindle drive signal.
GU-3612 (MAIN UNIT)
• [DMO] : "H" level?
O.K.
END

(2) CD check process

Check the RF signal.
GU-3612 (MAIN UNIT)
• Check the voltage of Test-Point (TP)
TP [RFAC] : about 1.0Vp-p
O.K.
Check Bus Line.
GU-3612 (MAIN UNIT)
• [IC805] ⇔ [IC804] (16MDRAM)
"L" ⇔ "H" alternate?
O.K.
END

(3) DVD check process

Check VSTEM communication.
GU-3612 (MAIN UNIT)
• [VDT07_COR], [XHAC_COR],
[XSHD_COR], [DCK_COR],VEFG_COR]
"L" ⇔ "H" alternate?
O.K.
Check Request signal.
GU-3612 (MAIN UNIT)
• Request from [B/E] and [F/E]
[HDRQ_COR] : "L" level?
O.K.
END
(1) Check Soldering of P.U.
• short-circuit?
(2) Check the circumference soldering of TR801 and
TR802.
N.G.
(3) Check connector insertion.
• [P.U.] - [GU-3612] FFC (CX241)
(4) Check the soldering [IC802] (CXD1881AR)
(5) Check the soldering [IC803] (FAN8042) and
circumference soldering of [IC803].
(1) Check soldering of [IC805] : 111-113pin.
(2) Check the circumference soldering of [SPWM1],
N.G.
[SPWM2] and [FG] signal.
(3) Check the soldering [IC971] (AN8471SA) and
circumference soldering of [IC971].
N.G.
(1) Check the circumference soldering of [IC802]
(2) Check the circumference soldering of [IC805]
Check Soldering
N.G.
• Address, Data Bus, Control Signal.
[BD0-15], [BA0-9], [XLCAS], [XUCAS], [XMOE], [XRAS]
• Check the circumference soldering of [IC804].
Check Soldering.
N.G.
• [IC805 ]: 36-49pin
• R952-R964
N.G.
• Check the circumference soldering of [IC601]
1.3. ディスク読めず
[No Play], [00 00] 等の表示
(1) ディスク回転せず
Pick-up の発光を確認
GU-3612 (MAIN UNIT)
･ P.U. レーザー発光 O.K.?
･ レーザー電流チェック
O.K.
スピンドルドライブ信号の確認
GU-3612 (MAIN UNIT)
･ [DMO] : "H" level?
O.K.
終了
(2) CD チェック工程
RF 信号の確認
GU-3612 (MAIN UNIT)
･ テストポイント (TP) の電圧確認
･ TP [RFAC] : 約 1.0Vp-p
O.K.
バスライン確認
GU-3612 (MAIN UNIT)
･ [IC805] ⇔ "H" 切替
O.K.
終了
(3) DVD チェック工程
ＶＳＴＥＭ 通信確認
GU-3612 (MAIN UNIT)
･ [VDT0-7_COR], [XHAC_COR],[XSHD_COR],
[DCK_COR], VEFG_COR]
"L" ⇔ "H" 切替
O.K.
リクエスト信号の確認
GU-3612 (MAIN UNIT)
･ [B/E] と [F/E] のリクエスト信号
[HDRQ_COR] : "L" level?
O.K.
終了
19
DVD-2910/955
(1) P.U. の半田ショートランドを確認
(2) TR801, TR802 周辺の半田付けを確認
N.G. (3) コネクタ接続を確認
･ [P.U.] - [GU-3612] FFC(CX241)
(4) [IC802] とその周辺回路の半田付けを確認
(5) [IC803] とその周辺回路の半田付けを確認
(1) [IC805] : 111-113pin の半田付けを確認
N.G. (2) [SPWM1], [SPWM2],[FG] 信号ライン周辺の
半田付けを確認
(3) [IC971] とその周辺回路の半田付けを確認
N.G.
(1) [IC802] とその周辺回路の半田付けを確認
(2) [IC805] とその周辺回路の半田付けを確認
半田付けを確認
･ アドレス、 データ、 制御信号
N.G.
[BD0-15]、 [BA0-9]、 [XLCAS]、 [XUCAS]、
[XMOE]、 [XRAS]
･ [IC804] とその周辺回路の半田付けを確認
半田付けを確認
N.G.
･ [IC805] : 36-49pin
･ R952-R964
N.G.
･ [IC601] とその周辺回路の半田付けを確認