Yamaha EMX5016CF, Руководство по обслуживанию

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EMX5016CF
112
3-2 Repair Flowchart
Check the primary side circuit.
Note: Check and repair must be done carefully, otherwise the electrical shock may be caused.
* 1) To prevent the electrical shock, be sure to discharge electricity from the capacitor.
Discharge is not necessary if you have left the unit for 10 minutes or more after turning the power off.
Discharge ( * 1)
1
Check R418 and R424 resistor value.
2
Check Q406 and Q407 C-E resistor value.
3
Check R419 and R421 resistor value.
4
Check R429, R430, R453 and R454
(Secondary)
resistor value.
R419, R421 = 33
Ω
?
R429, R430, R453, R454 = 1
Ω
? Replace R429, R430, R453 and R454.
Replace R418 and R424.
Replace R419 and R421.
Replace D404 and D405.
Replace Q406 or Q407.
Replace IC402.
R419, R421
OPEN or SHORT?
START
Between
±
terminals of C409 and C410
Between CN405 and CN409
Q406, Q407 C-E
Resistor value = 0 to several
Ω
?
R418, R424 = 6.8
Ω
?
Turn the power off.
(Disconnect AC plug from the wall outlet.)
A
NO
YES
YES
NO
NO SHORT
YES OPEN
NO
YES
Between CN406 and CN408