Denon DSD300 Service Manual

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Denon DSD300 Service Manual Manual pdf 25 page image

255. Check 1V9(1.9V module power)6. Check 1V2(1.2V module power)U9(4pin) input voltage check, spec 3.3V±5%Is the voltage in the spec?U9 output enable check (1pin) H?U9(3pin): PWM waveform do not have a problem?U9 output voltage check (C87), spec 1.9V±5%Is the voltage in the spec?Start (MAIN PWB)Finish1. Soldering check of (U9, R87, C79, C80)2. After release (R87), conduct check of (C79, C80)3. Replace (R87)4. Return to check "3V3"1. Soldering check of (U9, R92)2. Replace MAIN PWB assy1. Soldering check of (U9, L11. R94, R101, C86, C87, C88)2. After release (CX870 module), conduct check of (C86C87, C88)3. Replace (CX870 module→MAIN PWB assy)1. Soldering check of (U9, L11. R94, R101, C86, C87, C88)2. After release (CX870 module), conduct check of (C86,C87, C88)3. Replace (CX870 module→MAIN PWB assy)NONONONOYESYESYESYESU10(4pin) input voltage check, spec 3.3V±5%Is the voltage in the spec?U10 output enable check (1pin) H?U10(3pin): PWM waveform do not have a problem?U10 output voltage check (C90), spec 1.2V±5%Is the voltage in the spec?Start (MAIN PWB)Finish1. Soldering check of (U10, R89, C82, C83)2. After release (R89), conduct check of (C82, C83)3. Replace (R89)4. Return to check 3V31. Soldering check of (U10, R95)2. Replace (R95→MAIN PWB assy)1. Soldering check of (U10, L12, R96, R103, C89, C90, C91)2. After release CX870 module), conduct check of (C89, C90,C91)3. Replace (CX870 module→MAIN PWB assy)1. Soldering check of (U10, L12. R96, R103, C89, C90, C91)2. After release (CX870 module), conduct check of (C89,C90, C91)3. Replace (CX870 module→MAIN PWB assy)NONONONOYESYESYESYES