Yamaha EMX5016CF Service Manual page 3

EMX5016CF
I
PS CIRCUIT BOARD REPAIR GUIDE
1. Applicable Circuit Board
This guide is applicable when repairing the circuit board specified in the table 1-1.
Table 1-1
Circuit Board
PS
PS
PS
2. Electrical Performance
2-1 Preparation
• Connect the INLET circuit board (WG970200 for U, A destination or WG970300 for H, B, O destination) to CN402 and
CN410.
• Adjust the power supply voltage suites each circuit boards. Refer to the table 1-1 above.
• Connect the power cable to the AC inlet of the INLET circuit board.
2-2 Voltages of Each Part
The output voltage is normal if it is within the range specified in the table 2-1 when turning the power on.
Table 2-1
Measuring Item
+BH
+BL
-BL
-BH
+15 V
-15 V
Note: The output voltage may be out of the range if it is measured without the load resistance or the power supply voltage
differs from the specified in the table 1-1.
2-3 Discharge
To prevent the electrical shock (discharge of the electric charge from the capacitor), discharge electricity between the follow-
ing part when handling the PS circuit board.
• Between the positive (+) and negative (-) terminals of C409 and C410. If you have left the unit for 10 minutes or more after
turning the power off, you do not have to discharge.
• Between CN405 and CN409.
• Between CN406 and CN408.
110
Part No. Destination
WF534000 U
WF534100 H, B, O
WF534200 A
Measuring Part
CN405-CN407
CN406-CN407
CN408-CN407
CN409-CN407
CN902 1-2 pin
CN902 3-2 pin
Power Supply
AC 120 V
AC 230 V
AC 240 V
Output Voltage (DC)
U, A H, B, O
+94.3±3 V +90.3±3 V
+48.6±3 V +46.7±3 V
-48.6±3 V -46.7±3 V
-94.3±3 V -90.3±3 V
+15.0±0.6 V +15.0±0.6 V
-15.0±0.6 V -15.0±0.6 V
Load Resistance
5 kΩ, 3 W
5 kΩ, 3 W
5 kΩ, 3 W
5 kΩ, 3 W
10 kΩ, 1/4 W
10 kΩ, 1/4 W