Yamaha T6N Service Manual page 54

T5n/T4n/T3n
QQ
3 7 63 1515 0
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PST 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
T5n PST5
PST5
PST5
T4n PST4
PST4
PST4
T3n PST3
PST3
PST3
2. Electrical Performance
2-1 Preparation (See page 64)
• Connect the PSWT circuit board specified in the table 2-1 to CN101.
Table 2-1
Model Circuit Board
T5n PSWT5
PSWT5
PSWT5
T4n PSWT4
PSWT4
TE
L 13942296513
PSWT4
T3n PSWT3
PSWT3
PSWT3
• Connect the lord resistance to ± B power supply and ± 15 V power supply.
• Connect the AC cord to CN111 and CN112.
• Adjust the power supply voltage suites each circuit boards. Refer to the table 1-1 above.
2-2 Voltages of Each Part (See page 64)
Check the output voltage is within the range specified in table 2-2 when turning the power on.
Table 2-2
Model Measuring Item
T5n A ch + B
A ch - B
B ch + B
B ch - B
+15 V
-15 V
T4n A ch + B
A ch - B
B ch + B
B ch - B
+15 V
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-15 V
T3n A ch + B
A ch - B
B ch + B
.
B ch - B
+15 V
-15 V
54
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Part No. Destination
WH377200 U
WH377300 H, B, O
WH377400 A
WH377600 U
WH377700 H, B, O
WH377800 A
WH378000 U
WH378100 H, B, O
WH378200 A
Part No. Destination
WH526800 U
WH526900 H, B, O
WH527000 A
WH527200 U
WH527300 H, B, O
WH527400 A
WH527600 U
WH527700 H, B, O
WH527800 A
Measuring Part
CN105 - CN106
CN106 - CN107
CN108 - CN109
CN109 - CN110
CN102 6 - 5 pin
CN102 5 - 4 pin
CN105 - CN106
CN106 - CN107
CN108 - CN109
CN109 - CN110
CN102 6 - 5 pin
CN102 5 - 4 pin
CN105 - CN106
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CN106 - CN107
CN108 - CN109
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CN109 - CN110
CN102 6 - 5 pin
CN102 5 - 4 pin
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2 9
8
Power Supply
AC 120 V
AC 230 V
AC 240 V
AC 120 V
AC 230 V
AC 240 V
AC 120 V
AC 230 V
AC 240 V
Q Q
3 6 7 1 3 1 5
Output Voltage (DC)
U, A H, B, O
approx. +169 V approx. +162 V
approx. -169 V approx. -162 V
approx. +169 V approx. +162 V
approx. -169 V approx. -162 V
approx. +15.0 V approx. +15.0 V
approx. -15.0 V approx. -15.0 V
approx. +155 V approx. +149 V
approx. -155 V approx. -149 V
approx. +155 V approx. +149 V
approx. -155 V approx. -149 V
approx. +15.0 V approx. +15.0 V
approx. -15.0 V approx. -15.0 V
approx. +127 V approx. +121 V
co
approx. -127 V approx. -121 V
approx. +127 V approx. +121 V
.
approx. -127 V approx. -121 V
approx. +15.0 V approx. +15.0 V
approx. -15.0 V approx. -15.0 V
9 4 2 8
0 5 8 2 9 9 4 2 8
Load Resistance
22 k-ohms, 3 W
22 k-ohms, 3 W
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
22 k-ohms, 3 W
22 k-ohms, 3 W
10 k-ohms, 1/4 W
m
10 k-ohms, 1/4 W
22 k-ohms, 3 W
22 k-ohms, 3 W
22 k-ohms, 3 W
22 k-ohms, 3 W
10 k-ohms, 1/4 W
10 k-ohms, 1/4 W
9 9
9 9