Denon DSD-500, Service Manual

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5. Check 1V9
(1.9V module power)
6. Check 1V2
(1.2V module power)
U5(4pin) input voltage check, spec 3.3V±5%
Is the voltage in the spec?
U5 output enable check (1pin) H?
U5(3pin): PWM waveform do not have a problem?
U5 output voltage check (C53), spec 1.9V±5%
Is the voltage in the spec?
Start (MAIN PWB)
Finish
1. Soldering check of (U5, R56, C50, C51)
2. After release (R56), conduct check of (C50, C51)
3. Replace (R56)
4. Return to check "3V3"
1. Soldering check of (U5, R65)
2. Replace (R65→U5)
1. Soldering check of (U5, L9. R57, R62, C52, C53, C54)
2. After release (CX870 module), conduct check of (C52
C53, C54)
3. Replace (CX870 module→U5→L9)
1. Soldering check of (U5, L9. R57, R62, C52, C53, C54)
2. After release (CX870 module), conduct check of (C52,
C53, C54)
3. Replace (CX870 module→U5→L9)
NO
NO
NO
NO
YES
YES
YES
YES
U6(4pin) input voltage check, spec 3.3V±5%
Is the voltage in the spec?
U6 output enable check (1pin) H?
U6(3pin): PWM waveform do not have a problem?
U6 output voltage check (C58), spec 1.2V±5%
Is the voltage in the spec?
Start (MAIN PWB)
Finish
1. Soldering check of (U6, R58, C55, C56)
2. After release (R58), conduct check of (C55, C56)
3. Replace (R58)
4. Return to check 3V3
1. Soldering check of (U6, R80)
2. Replace (R80→U6)
1. Soldering check of (U6, L10, R63, R69, C57, C58, C59)
2. After release CX870 module), conduct check of (C57, C58,
C59)
3. Replace (CX870 module→U6→L10)
1. Soldering check of (U6, L10. R63, R69, C57, C58, C59)
2. After release (CX870 module), conduct check of (C57,
C58, C59)
3. Replace (CX870 module→U6→L10)
NO
NO
NO
NO
YES
YES
YES
YES