Troubleshooting; Lcd Doesn't Light - Denon RCD-M37 Service Manual

TROUBLE SHOOTING
1. LCD dosen't light
Check Power Supply Voltages for System uCOM.
MCU_CD_USB B'D
ST+3.9V, CN96 1pin
D204 cathode
O.K.
Check Reset signal for System uCOM.
MCU_CD_USB B'D
[IC24]:30pin RESET
"H"level O.K.?
O.K.
Check Oscillation waveform.
MCU_CD_USB B'D
[IC24]:26pin
27MHz OK?
O.K.
Check Power On Signal.
MCU_CD_USB B'D
[IC24]:9pin P_DWN
"H"level OK?
O.K.
Check Power Supply Voltages for FLD.
FRONT B'D
FL81]:38pin HV
FL81]:37pin VDD
[FL81]:between 1pin F1-43pin F2
O.K.
Check Reset Signal for FLD.
FRONT B'D
FL81 35pin /RST
Hlevel O.K.?
O.K.
Check FLD dirive Signal for FLD.
FRONT B'D
FL81 32,33,34pin DA,CP,CS
END
N.G Check Soldering.
96 1
SUB TRANS B'D
N.G Check Soldering.
IC20 on MCU_CD_USB B'D
N.G Check Soldering.
X202 on MCU_CD_USB B'D
N.G Check Soldering.
CN96 on MCU_CD_USB B'D
SUB TRANS B'D
Check Soldering.
FRONT B'D BN82 7pin +VKK
FRONT B'D BN82 8pin FL1-9pin FL2
FRONT B'D WF81 5pin VFD_5V
N.G AMP B'D CN95 8pin AC15V
AMP B'D ,CN82 7pin +VKK
MCU_CD_USB B'D WN81 1pin VFD+5V
POWER B'D
Check Parts
AMP B'D
Q703,D702,,D705, D703,D704 OK?
Check Soldering.
N.G FRONT B'D WF81 3pin, VFD_RST1
MCU_CD_USB B'D WN81 3pin VFD_RST
IC24 on MCU_CD_USB B'D
Check Parts
FRONT B'D Q804 OK?
Check Soldering.
N.G FRONT B'D WF81 4,5,6pin,
VFD_CE,VFD_CLK,VFD_DI
MCU_CD_USB B'D WN81 4,5,6pin,
VFD_CE,VFD_CLK,VFD_DI
IC24 on MCU_CD_USB B'D
Check Parts
FRONT B'D Q801,802,803 OK?
RCD-M37 / RCD-M37DAB / D-E500 / D-M37
トラブルシューティング
トラブルシューティング
トラ ルシューティン
1. LCD 1. LCD点灯せず せ
ｼｽﾃﾑﾏｲｺﾝ用電源電圧確認
MCU_CD_USB B'D
・ ST+3.9V, CN96 1pin
・ D204 ｶｿｰﾄﾞ
O.K.
ｼｽﾃﾑﾏｲｺﾝ用RESET信号の確認
1U-3846-1(MAIN UNIT)
・ [IC24]:30pin RESET
"H"level O.K.?
O.K.
発振波形確認
1U-3846-1(MAIN UNIT)
・ [IC24]:26pin
27MHz OK?
O.K.
POWER ON 信号の確認
MCU_CD_USB B'D
・ [IC24]:9pin P_DWN
"H"level OK?
O.K.
LCD用電源電圧確認
・ FL81]:38pin HV
・ FL81]:37pin VDD
・ [FL81]: 1pin F1-43pin F2
O.K.
FLD用RESET信号の確認
FRONT B'D
・ FL81 35pin /RST
Hlevel O.K.?
O.K.
FLD用ドライブ信号の確認
FRONT B'D
・ FL81 32,33,34pin DA,CP,CS
終了
23
N.G 半田付けを確認
・ CN96 1pin
・ SUB TRANS B'D
N.G 半田付けを確認
・ IC20 on MCU_CD_USB B'D
N.G 半田付けを確認
・ X202 on MCU_CD_USB B'D
N.G 半田付けを確認
・ CN96 on MCU_CD_USB B'D
・ SUB TRANS B'D
半田付けを確認
・ FRONT B'D BN82 7pin +VKK
・ FRONT B'D BN82 8pin FL1-9pin FL2
・ FRONT B'D WF81 5pin VFD_5V
N.G ・ AMP B'D CN95 8pin AC15V
・ AMP B'D ,CN82 7pin +VKK
・ MCU_CD_USB B'D WN81 1pin VFD+5V
・ POWER B'D
部品確認
・ AMP B'D
Q703,D702,,D705, D703,D704 OK?
半田付けを確認
N.G ・ FRONT B'D WF81 3pin, VFD_RST1
・ MCU_CD_USB B'D WN81 3pin VFD_RST
・ IC24 on MCU_CD_USB B'D
部品確認
・ FRONT B'D Q804 OK?
半田付けを確認
N.G ・ FRONT B'D WF81 4,5,6pin,
VFD_CE,VFD_CLK,VFD_DI
・ MCU_CD_USB B'D WN81 4,5,6pin,
VFD_CE,VFD_CLK,VFD_DI
・ IC24 on MCU_CD_USB B'D
部品確認
・ FRONT B'D Q801,802,803 OK?