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1
6. ADJUSTMENT
6.1 AMP UNIT ADJUSTMENT
A
The items for adjusting AMP unit are:
1
Offset Voltage
Idling Voltage
2
Refer to the 126 pages for connection of the system at the time of adjustment and repair.
Both items are adjustable if the bottom plate of the product is removed to expose the unit.
Adjustment is capable using half-fixed resistance, by inserting the precise driver
into a hole on the base plate from its surface B.
When adjusting offset voltage--- VR1101, VR1201, VR1301, VR1401
When adjusting idling current--- VR1102, VR1202, VR1302, VR1402
Connecting Diagram for AMP Unit
B
[Offset Voltage/Idling Current Adjustment and Confirmation]
Voffset
VR1101
1k
C
Remarks
1
When adjusting and confirming the offset voltage/idling current, connect 4
terminal.
D
2
Input must be non-signal.
3
For adjusting offset voltage, coarsely control with VR1101, VR1201, VR1301, VR1401
immediately after powering ON, within 3 or 4 minutes.
Idling current must also be coarsely adjusted at the same time.
4
Idling current must be adjusted with VR1102, VR1202, VR1302, VR1402 immediately after
the completion of offset voltage adjustment (within 4 or 5 minutes after powering ON).
5
Both adjustments must be completed within 3 to 5 minutes after powering ON.
6
For confirming, measure "within 3 to 5 minutes" after powering ON.
7
Measuring points for Rated Value No.13 (offset voltage)
AL
(CN66-CN95) or its equivalent land
AR
(CN48-CN83) or its equivalent land
BL
(CN60-CN91) or its equivalent land
E
BR
(CN54-CN87) or its equivalent land
8
Measuring points for Rated Value No.14 (idling current)
AL
(CN63-CN64)
AR
(CN45-CN46)
BL
(CN57-CN58)
BR
(CN51-CN52)
Postscript)
F
102
1
2
Q1119
2SC4886
Iidle
R1129
0.1
R1130
0.1
VR1102
2.2k
Q1120
2SA1860
The voltage between R1129 and R1130 as shown in the above diagram
is to be measured so as to adjust the idling current in:
*When mounted on main Main Heat Sink --- 30mV (150mA
*When not mounted on main Main Heat Sink --- 20mV (100mA
2
3
AMP Unit
CN45
CN1101
CN48
CN50
CN49
CN69
CN83
CN85
CN46
CN84
CN86
0
RS-A9/EW
3
4
3
4ohm load
4
2
1
load to the speaker output
0.2
)
0.2
)
4
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