Trouble Shooting; Fl Tube Doesn’t Light; Check The Set-Up Process Of Syatem Μ-Com - Denon DVD-2910 Service Manual

TROUBLE SHOOTING

1. GU-3612 MAIN UNIT
1.1. FL TUBE doesn't light
(1) Check the Set-up process of Syatem µ-COM
Check Power Supply Voltages.
GU-3612 (MAIN UNIT)
• [IC318] : 80, 14
+3.3V_D1, +3.3V_NSW
O.K.
Check Oscillation waveform.
GU-3612 (MAIN UNIT)
• [IC318] :
16MHz at 13pin.
O.K.
Check Power Supply Voltages.
GU-3612 (MAIN UNIT)
• [IC318] :
"H" level at 39pin? "L" level at 7pin and
44pin?
O.K.
Check Reset Signal
GU-3612(MAIN UNIT)
• [IC318] :
"H" level at 10pin?
O.K.
Check Data Bus between.
GU-3616-3 (DISPLAY UNIT)
FLD Driver (GU-3614-3 , IC101)
• [VFD_RST] : "H" level?
O.K.
Continue to next step.
Check the Set-up process of B/E µ-COM.
N.G. Check Soldering.
• CX141 on MAIN UNIT.
N.G.
Check Soldering.
• X302 on MAIN UNIT.
N.G.
Check Soldering.
• IC318 on MAIN UNIT.
N.G. Check Soldering.
• IC319 (Reset IC) on MAIN UNIT.
N.G.
(1) Check soldering of CY171 on MAIN UNIT.
(2) GU-3616-3 is N.G. (No Good).
トラブルシューティング
1. GU-3612 MAIN UNIT
1.1. FL 管点灯せず
(1) システム μ-COM 立ち上がりチェック工程
電源電圧確認
GU-3612 (MAIN UNIT)
･ [IC318] : 80, 14
+3.3V_D1, +3.3V_NSW
O.K.
発振波形確認
GU-3612 (MAIN UNIT)
･ [IC318] :
16MHz at 13pin.
O.K.
電源電圧確認
GU-3612(MAIN UNIT)
･ [IC318] :
"H" level at 39pin? "L" level at 7pin and 44pin?
O.K.
RESET 信号の確認
GU-3612(MAIN UNIT)
･ [IC318] :
"H" level at 10pin?
O.K.
データバスの確認
GU-3616-3 (DISPLAY UNIT)
FLD Driver (GU-3616-3, IC101)]
･ [VFD_RST] : "H" level?
O.K.
次のステップへ
(2) B/E μ-COM 立ち上げチェック工程へ
16
DVD-2910/955
N.G. 半田付けを確認
･ MAIN UNIT の CX141
N.G. 半田付けを確認
･ MAIN UNIT の X302
N.G. 半田付けを確認
･ MAIN UNIT の IC318
N.G. 半田付けを確認
･ MAIN UNIT の IC319 (Reset IC)
N.G. (1) MAIN UNIT の CY171 の半田付けを確認
(2) GU-3616-3 の不良