Denon DVD-3930 Service Manual page 31

2. GU-3749-1 (MAIN UNIT)
2.1. FL TUBE dosen't light
(1) Check the Set-up process of System
Check Power Supply Voltages.
GU-3749-1(MAIN UNIT)
N.G.
• [IC157] 69
+3.3V_NSW OK?
O.K.
Check Power Supply Voltages.
GU-3749-1(MAIN UNIT)
N.G.
• [IC157] 83, 102 [IC154] 1
+1.2V_DV3.2, +3.3_A, +3.3_D1 OK?
O.K.
Check Reset signal.
GU-3749-1(MAIN UNIT)
N.G.
• [IC157]
"H" level at 84pin?
O.K.
Check Oscillation waveform.
GU-3749-1(MAIN UNIT)
N.G.
• [IC157] 162, 163, 186, 190pin
27MHz at 162, 163, 183 pin
33.87MHz at 190pin
O.K.
Check Bus Line.
Check Address, Data Bus between
N.G.
GU-3749-1(MAIN UNIT)
• [IC157] and [IC155](Flash Rom)
"H" ⇔ "L" alternate?
O.K.
Check Bus Line.
Check Address, Data Bus between
N.G.
GU-3749-1(MAIN UNIT)
• [IC157], [IC156] and [IC158] (SDRAM)
"H" ⇔ "L" alternate?
O.K.
2
Check I C Signal.
GU-3749-1(MAIN UNIT)
N.G.
• [IC157]
"H" ⇔ "L" alternate?
O.K.
Check Soldering.
GU-3749-1(MAIN UNIT)
• MAIN UNIT: CY132
Check the output level.
Check Soldering.
GU-3749-1(MAIN UNIT)
N.G.
GU-3749-1(MAIN UNIT)
• [CY132] 13pin
• [IC403] 2pin
[ON/ST]: "H" level?
O.K.
Check Soldering.
GU-3749-1(MAIN UNIT)
• [IC102](PQ012FZ01ZP)
Check Soldering.
GU-3749-1(MAIN UNIT)
• [IC153](Reset IC), R237
Check Soldering.
Check Clock waveform.
GU-3749-1(MAIN UNIT)
N.G.
GU-3749-1(MAIN UNIT)
• MAIN UNIT: X150
• [IC154] 7, 15pin
• [IC154](SM8707)
Check Soldering.
O.K.
GU-3749-1(MAIN UNIT)
• R271, R273, R274, R253,
R264, R292, R294
Check Soldering.
GU-3749-1(MAIN UNIT)
• [LD0-LD15], [LCS3, LOE]
Check Soldering.
• Address, Data Bus, Control Signal.
[MDQ0-24], [MA0-9], [NCAS], [NRAS]
• Check the soldering [IC156] [158]and
circumference soldering of [IC156] [158].
Check Soldering.
GU-3749-1(MAIN UNIT)
• [IC152] and [IC157]
2. GU-3749-1 (MAIN UNIT)
2.1.
FL 管点灯せず
(1) システム立ち上がりチェック工程
電源電圧確認
GU-3749-1(MAIN UNIT）
N.G.
･ [IC157] 69
+3.3V_NSW OK?
O.K.
電源電圧確認
GU-3749-1(MAIN UNIT)
N.G.
･ [IC157] 83, 102 [IC154] 1
+1.2V_DV3.2, +3.3_A, +3.3_D1 OK?
O.K.
RESET 信号の確認
GU-3749-1(MAIN UNIT)
N.G.
･ [IC157]
"H" level at 84pin?
O.K.
発振波形確認
GU-3749-1(MAIN UNIT)
N.G.
･ [IC157] 162, 163, 186,190pin
27MHz at 162, 163, 186pin
33.87MHz at 190pin
O.K.
バスラインの確認
GU-3749-1(MAIN UNIT)
N.G.
･ [IC157] と [IC155] (Flash Rom) 間の
アドレス、データバスの確認
"H" ⇔ "L" 切替
O.K.
バスラインの確認
GU-3749-1(MAIN UNIT)
N.G.
･ [IC157] と [IC156] [IC158] (SDRAM)
間のアドレス、データバスの確認
"H" ⇔ "L" 切替
O.K.
２
I C 信号の確認
GU-3749-1(MAIN UNIT)
N.G.
･ [IC157] 66, 67
"H" ⇔ "L" 切替
O.K.
31
半田付けを確認
GU-3749-1(MAIN UNIT)
･ MAIN UNIT の CY132
出力レベル確認
半田付けを確認
GU-3749-1(MAIN UNIT)
N.G.
GU-3749-1(MAIN UNIT)
･ [CY132] 13pin
･ [IC403] 2pin
[ON/ST]: "H" level?
O.K.
半田付けを確認
GU-3749-1(MAIN UNIT)
[IC102](PQ012FZ01ZP)
半田付けを確認
GU-3749-1(MAIN UNIT)
･ [IC153] (ResetIC), R237
半田付けを確認
クロックの波形確認
GU-3749-1(MAIN UNIT)
N.G.
GU-3749-1(MAIN UNIT)
･ MAIN UNIT の X150
･ [IC154] 7, 15pin
･ [IC154] (SM8707)
半田付けを確認
O.K.
GU-3749-1(MAIN UNIT)
･ R271, R273, R274,
R264, R292, R294
半田付けを確認
GU-3749-1(MAIN UNIT)
･ [LD0-LD15], [LCS3, LOE]
半田付けを確認
･ アドレス、データ、制御信号
[MDQ0-24], [MA0-9], [NCAS], [NRAS]
･ [IC156] [IC158] と
その周辺回路の半田付けを確認
半田付けを確認
GU-3749-1(MAIN UNIT)
･ [IC152] と [IC157]
DVD-3930/3930CI