Denon RCD-CX1, Service Manual

Page: 39 / 116

39
RCD-CX1
3. 8U-210024(SYS/DAMP/DISP UNIT)
3.1. FL 管点灯せず
(1) システムマイコン立ち上がりチェック工程
システムマイコン用電源電圧確認
･ [CY112] 6pin "+3.3V̲NSW"
N.G.
半田付けを確認
･ [CY112]
･ 8U-210025 (SMPS UNIT) [CX112]
O.K.
システムマイコン用 RESET 信号確認
･ [IC302] 10pin "H"level O.K.?
N.G.
半田付けを確認
･ [IC302] [IC303]
O.K.
システムマイコン発振波形確認
･ [IC302] 11pin 4MHz O.K.?
N.G.
半田付けを確認
･ [X301] [IC302]
O.K.
POWER ON 信号確認
･ [IC302] 80pin "H"level O.K.?
N.G.
半田付けを確認
･ [IC302] [CY112]
･ 8U-210025 (SMPS UNIT) [CX112]
O.K.
FL 管用電源電圧確認
･ FL+
･ FL-
･ +32V
N.G.
半田付けを確認
･ [TR704] [TR705] [D708-D715] [IC704]
[L701] [T701]
O.K.
バスライン確認
･ [IC302] と [FL101] 間の信号確認
"H" ⇔ "L" 切替
N.G.
半田付けを確認
･ [FL101] [CX251] [CY251]
O.K.
終了
3. 8U-210024(SYS/DAMP/DISP UNIT)
3.1. FL TUBE dosen't light
(1) Check the Set-up process of System
μ
com
Check Power Supply Voltages for System
μ
com.
• [CY112] 6pin "+3.3V_NSW"
N.G.
Check Soldering.
• [CY112]
• 8U-210025 (SMPS UNIT) [CX112]
O.K.
Check Reset signal for System
μ
com.
• [IC302] 10pin "H"level O.K.?
N.G.
Check Soldering.
• [IC302] [IC303]
O.K.
Check Oscillation waveform for System
μ
com.
• [IC302] 11pin 4MHz O.K.?
N.G.
Check Soldering.
• [X301] [IC302]
O.K.
Check Power On signal.
• [IC302] 80pin "H"level O.K.?
N.G.
Check Soldering.
• [IC302] [CY112]
• 8U-210025 (SMPS UNIT) [CX112]
O.K.
Check Power Supply Voltages for FL TUBE.
• FL+
• FL-
• +32V
N.G.
Check Soldering.
• [TR704] [TR705] [D708-D715] [IC704] [L701] [T701]
O.K.
Check Bus Line.
• Check signal, between [IC302] and [FL101].
"H"
⇔
"L" alternate?
N.G.
Check Soldering.
• [FL101] [CX251] [CY251]
O.K.
END