Denon DSD300 - Check VMCU; Check 3 V3

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3. Check VMCU
(3.3V standby power)
U11 input voltage check (1pin), spec 12V±10%
Is the voltage in the spec?
U11 output enable check (3pin) H?
U11 output voltage check (5pin), spec 3.3V±5%
Is the voltage in the spec?
1. Soldering check of (U11, R35, C34, C257)
2. After release (R35), conduction check of (C34, C257)
3. Replace (R35→U11)
4. Return to Check "12V"
1. Soldering check of (R53)
2. Replace (R53)
1. Soldering check of (C35, C68)
2. After release (R60), conduction check of (C35, C68)
3. Replace MAIN PWB assy
NO
NO
NO
YES
YES
YES
Start (MAIN PWB)
Finish
4. Check 3V3
(3.3V system power)
U5 input voltage check (2pin), spec 12V±10%
Is the voltage in the spec?
U5 output enable check (7pin) H?
U5(3pin): PWM waveform do not have a problem?
U5 output voltage check (R58), spec 3.3V±5%
Is the voltage in the spec?
1. Soldering check of (U5, R52, C51, C52)
2. After release (R52), conduct check of (C51, C52)
3. Replace (R52)
1. Soldering check of (U5, R59)
2. Return to check "VMCU", "5V", "1V2", "1V9", "ADSP_1V1"
1. Soldering check of (U5, C50, L7, R61, R65, C57, C58,
C59)
2. After release (R58), conduct check of (C57, C58, C59)
3. Replace MAIN PWB assy
1. Soldering check of (U5, L7, C50)
2. Replace MAIN PWB assy
NO
NO
NO
NO
YES
YES
YES
YES
Start (MAIN PWB)
Finish