Denon DSD-500, Руководство по обслуживанию

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7. Check 5V
(5.2V VBUS power for DOCK)
Start (MAIN PWB)
Preparing: Release (Q11)
U18(2pin) input voltage check, spec 12V±10%
Is the voltage in the spec?
U18 output enable (7pin) H?
U18 PWM output wave check (3pin)
IPOD_5V output voltage check (C406)
Spec. 5.15V-5.25V
1. Soldering check of (U18, R377, R378, C401, C402)
2. After release (R377, R378), conduct check of (C401, C402)
3. Return to check "12V"
1. Soldering check of (R383, Q10)
2. Return to check "VMCU"
1. Soldering check of (U18, R381, R382, C400, C405, C406, C407)
2. After remove wire connected to Dock PWB, conduct
check of (C405, C406, C407)
3. Replace (U2→C400→L2)
1. Soldering check of (U2, L2, C400, R377, R378)
2. Replace (C400→U18)
NO
NO
NO
NO
YES
YES
YES
YES
Finish
8. Check 5V
(5.2V VBUS power for USB)
U3(2pin) input voltage check, spec 12V±10%
Is the voltage in the spec?
U3 output enable (7pin) H?
U3 PWM output wave check (3pin)
5V output voltage check (C26), spec 5.15V-5.25V
Is the voltage in the spec?
1. Soldering check of (U3, R18, R21, C21, C22)
2. After release (R18, R21), conduct check of (C21, C22)
3. Return to check "12V"
Return to check "VMCU"
1. Soldering check of (U3, R27, R30, C25, C26, C27)
2. After release(R24, R28), conduct check of (C25, C26, C27)
3. Replace (C16→U3→L6)
1. Soldering check of (U3, L6, C16, R27, R30)
2. Replace (C16→U3)
NO
NO
NO
NO
YES
YES
YES
YES
Preparing: 1) Input function is 'USB', 2) Release (Q12)
Start (MAIN PWB)
Finish