Denon DVD-3930 Service Manual page 32

Check Data Bus
GU-3750-1(DISPLAY UNIT)
FLD Driver (GU-3750-1), IC101 60pin
N.G.
• [VFD_RST]: "H" level?
• The test mode "T0" is executed.
The FL tube display turns all on?
O.K.
END
2.2. Image is not displayed. (Blue-back, DENON wallpaper)
Check Digital output signal for Video. [1]
GU-3749-1(MAIN UNIT)
• [IC154] 4pin: PCLK
• [IC157] 176~183pin: YUV(0-7)
O.K.
Check Digital output signal for Video. [2]
GU-3749-1(MAIN UNIT)
• [CX211]: PCLK, 20pin
• [CX211]: YUV(0-7), 11-18pin
O.K.
Continue to the check process of
GU-3749-2(VIDEO UNIT)
2.3. Does not Read Disc
[00 00] displayed etc.
(1) Disc does not Rotate.
Check the Emission of Pick-up.
GU-3749-1(MAIN UNIT)
• Emission of P.U. laser O.K.?
• The test mode "T2" is executed.
Laser current O.K.?
O.K.
Check Spindle drive.
GU-3749-1(MAIN UNIT)
• [SPINDLE]: "H" level?
O.K.
END
GU-3749-1(MAIN UNIT)
(1) Check Soldering of CX211
GU-3750-1(DISPLAY UNIT)
(2) GU-3750-1 is N.G.
Check Soldering.
GU-3749-1(MAIN UNIT)
N.G.
• [IC154]: 4pin, R257, R439
• [IC157]: 176-183pin
Check Soldering.
GU-3749-1(MAIN UNIT)
N.G.
• [CX211]: 20pin, R439
• [CX211]: 11-18pin, R283-290
(1) Check Soldering of P.U.
• short-circuit?
(2) Check the circumference soldering of TR150 and
TR153.
(3) Check connector insertion.
N.G.
• [P.U.]-[GU-3749] FFC(CX241)
(4) Check the soldering [IC157] and circumference
soldering of [IC157]
(5) Check the soldering [IC151] and circumference
soldering of [IC151]
(1) Check soldering of [IC157]:85, 90pin
(2) Check the circumference soldering of
N.G.
[SPINDLE], [FGIN] signal.
(3) Check the soldering [IC151] and circumference
soldering of [IC151]
データバスの確認
GU-3750-1(DISPLAY UNIT)
N.G.
FLD Driver(GU-3750-1), IC101 60pin
･ [VFD_RST]: "H" level?
･ テストモード T0 実行 全点灯 OK?
O.K.
終了
2.2. 映像出力せず。 （ブルーバック、DENON 壁紙）
映像用デジタル信号出力確認 [1]
GU-3749-1(MAIN UNIT)
･ [IC154] 4pin: PCLK
･ [IC157] 176 ∼ 183pin: YUV(0-7)
O.K.
映像用デジタル信号出力確認 [2]
GU-3749-1(MAIN UNIT)
･ [CX211]: PCLK, 20pin
･ [CX211]: YUV(0-7), 11-18pin
O.K.
GU-3749-2(VIDEO UNIT) チェック行程へ
2.3. ディスク読めず
[00 00] 等の表示
(1) ディスク回転せず
Pick-up の発光を確認
GU-3749-1(MAIN UNIT)
･ P.U. レーザー発光 O.K.?
･ テストモード T2 実行 レーザー電流 OK?
O.K.
スピンドルドライブ信号の確認
GU-3749-1(MAIN UNIT)
･ [SPINDLE]: "H" level?
O.K.
終了
32
GU-3749-1(MAIN UNIT)
(1) CX211 の半田付けを確認
GU-3750-1(DISPLAY UNIT)
(2) GU-3750-1 の不良
半田付けを確認
GU-3749-1(MAIN UNIT)
N.G.
･ [IC154]: 4pin, R257, R439
･ [IC157]: 176-183pin
半田付けを確認
GU-3749-1(MAIN UNIT)
N.G.
･ [CX211]: 20pin, R439
･ [CX211]: 11-18pin, R283-290
(1) P.U. の半田ショートランドを確認
(2) TR150, TR153 周辺の半田付けを確認
(3) コネクタ接続を確認
N.G.
･ [P.U.]-[GU-3749] FFC(CX241)
(4) [IC157] とその周辺の半田付けを確認
(5) [IC151] とその周辺の半田付けを確認
(1) [IC157] 85, 90pin の半田付けを確認
N.G.
(2) [SPINDLE] [FGIN] 信号ライン周辺の半田付けを確認
(3) [IC151] とその周辺の半田付けを確認
DVD-3930/3930CI