Denon D-M37 - Troubleshooting; LCD Doesnt Light

23
RCD-M37 / RCD-M37DAB / D-E500 / D-M37
TROUBLE SHOOTING
トラ ルシューティン
1. LCD dosen't light
1. LCD せ
Check Power Supply Voltages for System uCOM.
MCU_CD_USB B'D N.G Check Soldering.
䊶 ST+3.9V, CN96 1pin 䊶䌃䌎96䇭1䌰䌩䌮
䊶 D204 cathode 䊶 SUB TRANS B'D
O.K.
Check Reset signal for System uCOM.
MCU_CD_USB B'D N.G Check Soldering.
䊶 [IC24]:30pin RESET 䊶 IC20 on MCU_CD_USB B'D
"H"level O.K.?
O.K.
Check Oscillation waveform.
MCU_CD_USB B'D N.G Check Soldering.
䊶 [IC24]:26pin 䊶 X202 on MCU_CD_USB B'D
27MHz OK?
O.K.
Check Power On Signal.
MCU_CD_USB B'D N.G Check Soldering.
䊶 [IC24]:9pin P_DWN 䊶 CN96 on MCU_CD_USB B'D
"H"level OK? 䊶 SUB TRANS B'D
O.K.
Check Power Supply Voltages for FLD. Check Soldering.
FRONT B'D 䊶 FRONT B'D BN82 7pin +VKK
䊶 FL81]:38pin HV 䊶 FRONT B'D BN82 8pin FL1-9pin FL2
䊶 FL81]:37pin VDD 䊶 FRONT B'D WF81 5pin VFD_5V
䊶 [FL81]:between 1pin F1-43pin F2 N.G 䊶 AMP B'D CN95 8pin AC15V
䊶 AMP B'D ,CN82 7pin䇭+VK
K
䊶 MCU_CD_USB B'D WN81 1pin VFD+5V
䊶 POWER B'D
Check Parts
䊶 AMP B'D
㩷 Q703,D702,,D705, D703,D704 OK?
O.K.
Check Reset Signal for FLD. Check Soldering.
FRONT B'D N.G 䊶 FRONT B'D WF81 3pin, VFD_RST1
䊶 FL81 35pin /RST 䊶 MCU_CD_USB B'D WN81 3pin VFD_RST
Hlevel O.K.? 䊶 IC24 on MCU_CD_USB B'D
Check Parts
䊶 FRONT B'D Q804 OK?
O.K.
Check FLD dirive Signal for FLD. Check Soldering.
FRONT B'D N.G 䊶 FRONT B'D WF81 4,5,6pin,
䊶 FL81 32,33,34pin DA,CP,CS VFD_CE,VFD_CLK,VFD_DI
䊶 MCU_CD_USB B'D WN81 4,5,6pin,
VFD_CE,VFD_CLK,VFD_DI
䊶 IC24 on MCU_CD_USB B'D
Check Parts
䊶 FRONT B'D Q801,802,803 OK?
END
トラブルシューティング
トラ
ブ
ルシューティン
グ
1. LCD
点灯
せ
ず
ｼｽﾃﾑﾏｲｺﾝ用電
源
電圧
確認
MCUCDUSBB'D N.G
半
田
付
けを
確認
・ ST+3.9V,CN961pin ・ CN961pin
・ D204ｶｿｰ
ﾄ
ﾞ
・ SUBTRANSB'D
O
.
K
.
ｼｽﾃﾑﾏｲｺﾝ用RESE
T
信
号の
確認
1U-3846-1(MAINUNIT) N.G
半
田
付
けを
確認
・ [IC24]:30pinRESET ・ IC20onMCUCDUSBB'D
"H"levelO.K.?
O
.
K
.
発振波形確認
1U-3846-1(MAINUNIT) N.G
半
田
付
けを
確認
・ [IC24]:26pin ・ X202onMCUCDUSBB'D
27MHzOK?
O
.
K
.
POWERON
信
号の
確認
MCUCDUSBB'D N.G
半
田
付
けを
確認
・ [IC24]:9pinPDWN ・ CN96onMCUCDUSBB'D
"H"levelOK? ・ SUBTRANSB'D
O
.
K
.
LCD用電
源
電圧
確認
半
田
付
けを
確認
・ FL81]:38pinHV ・ FRONTB'DBN827pin+VKK
・ FL81]:37pinVDD ・ FRONTB'DBN828pinFL1-9pinFL2
・ [FL81]:1pinF1-43pinF2 ・ FRONTB'DWF815pinVFD5V
N.G ・ AMPB'D CN958pinAC15V
・ AMPB'D ,CN827pin +VK
K
・ 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?
O
.
K
.
FLD用RESE
T
信
号の
確認
半
田
付
けを
確認
FRONTB'D N.G ・ FRONTB'D WF813pin,VFDRST1
・ FL81 35pin/RS
T
・ MCUCDUSBB'DWN813pinVFDRST
HlevelO.K.? ・ IC24onMCUCDUSBB'D
部品確認
・ FRONTB'D Q804OK?
O.K.
FLD用
ド
ラ
イブ
信
号の
確認
半
田
付
けを
確認
FRONTB'D N.G ・ FRONTB'D WF814,5,6pin,
・ FL81 32,33,34pinDA,CP,CS 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?
終
了