Yamaha XP-7000 Service Manual page 48
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Also See for XP-7000:
- Owner's manual (22 pages) ,
- Manual de instrucciones (20 pages) ,
- Owner's manual (20 pages)
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XP7000/XP5000
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
Model
Circuit Board
XP7000
PS70U
PS70H
PS70A
XP5000
PS50U
PS50H
PS50A
2.
Electrical Performance
2-1
Preparation (See page 51)
• Connect the PSW circuit board (XP7000=WF400100, XP5000=WF400200) to CN403, CN404 and CN405.
• Connect J401 and J402, or short-circuit CN406 and CN415 (for H/B/K/O destination). After repair, make these connections
to its original state.
• Adjust the power supply voltage suites each circuit boards. Refer to the table 1-1 above.
2-2
Voltages of Each Part (See page 51)
The output voltage is normal if it is in the range specified in the table 2-1 when turning the power on.
Table 2-1
Model
Measuring Item
XP7000
+B
-B
+15 V
-15 V
XP5000
+B
-B
+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 (See page 51)
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 C420 and C421. If you have left the unit for 10 minutes or more after
turning the power off, you do not have to discharge.
• Between W406-W407, and W407-W408.
• Between the terminals of C402.
48
Part No.
Destination
WF397200
U/T
WF397300
H/B/K/O
WF397400
A
WF397600
U/T
WF397700
H/B/K/O
WF397800
A
Measuring Part
Output Voltage (DC)
U/T/A
W406-W407
approx. +141.4 V
W407-W408
approx. -141.4 V
CN408 1-2 pin
approx. +15.0 V
CN408 3-2 pin
approx. -15.0 V
W406-W407
approx. +113.1 V
W407-W408
approx. -113.1 V
CN408 1-2 pin
approx. +15.0 V
CN408 3-2 pin
approx. -15.0 V
Power Supply
AC 120 V
AC 230 V
AC 240 V
AC 120 V
AC 230 V
AC 240 V
H/B/K/O
approx. +143.5 V
approx. -143.5 V
approx. +15.0 V
approx. -15.0 V
approx. +124.3 V
approx. -124.3 V
approx. +15.0 V
approx. -15.0 V
Load Resistance
22 k-ohms, 3 W
22 k-ohms, 3 W
10 k-ohms, 1/4 W
10 k-ohms, 1/4 W
22 k-ohms, 3 W
22 k-ohms, 3 W
10 k-ohms, 1/4 W
10 k-ohms, 1/4 W
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