Yamaha T6N, Service Manual

Page: 54 / 107

T5n/T4n/T3n
54
Model
T5n
T4n
T3n
Circuit Board
PST5
PST5
PST5
PST4
PST4
PST4
PST3
PST3
PST3
Part No.
WH377200
WH377300
WH377400
WH377600
WH377700
WH377800
WH378000
WH378100
WH378200
Destination
U
H, B, O
A
U
H, B, O
A
U
H, B, O
A
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
■
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
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
H, B, O
approx. +162 V
approx. -162 V
approx. +162 V
approx. -162 V
approx. +15.0 V
approx. -15.0 V
approx. +149 V
approx. -149 V
approx. +149 V
approx. -149 V
approx. +15.0 V
approx. -15.0 V
approx. +121 V
approx. -121 V
approx. +121 V
approx. -121 V
approx. +15.0 V
approx. -15.0 V
Measuring Item
A ch + B
A ch - B
B ch + B
B ch - B
+15 V
-15 V
A ch + B
A ch - B
B ch + B
B ch - B
+15 V
-15 V
A ch + B
A ch - B
B ch + B
B ch - B
+15 V
-15 V
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
CN106 - CN107
CN108 - CN109
CN109 - CN110
CN102 6 - 5 pin
CN102 5 - 4 pin
Model
T5n
T4n
T3n
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
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
Output Voltage (DC)
U, A
approx. +169 V
approx. -169 V
approx. +169 V
approx. -169 V
approx. +15.0 V
approx. -15.0 V
approx. +155 V
approx. -155 V
approx. +155 V
approx. -155 V
approx. +15.0 V
approx. -15.0 V
approx. +127 V
approx. -127 V
approx. +127 V
approx. -127 V
approx. +15.0 V
approx. -15.0 V
Model
T5n
T4n
T3n
Circuit Board
PSWT5
PSWT5
PSWT5
PSWT4
PSWT4
PSWT4
PSWT3
PSWT3
PSWT3
Part No.
WH526800
WH526900
WH527000
WH527200
WH527300
WH527400
WH527600
WH527700
WH527800
Destination
U
H, B, O
A
U
H, B, O
A
U
H, B, O
A
• 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
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