Pioneer RS-A9/EW manual Amp Unit Adjustment

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6. ADJUSTMENT

6.1 AMP UNIT ADJUSTMENT

A

The items for adjusting AMP unit are:

1Offset Voltage

2Idling Voltage

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

BConnecting Diagram for AMP Unit

[Offset Voltage/Idling Current Adjustment and Confirmation]

		Q1119			AMP Unit
		2SC4886
		CN45			CN1101
Voffset	Iidle	R1129
		0.1	CN48	CN50
			CN49		3
		R1130			CN69
VR1101	VR1102	0.1	CN83	CN85
1k	2.2k	CN46
C			CN84		4
					CN86
		Q1120
		2SA1860	0		2
					1

4ohm load

Remarks
1	When adjusting and confirming the offset voltage/idling current, connect 4 load to the speaker output
D	terminal.
	Input must be non-signal.
2
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
E	BL	(CN60-CN91) or its equivalent land
	BR	(CN54-CN87) or its equivalent land

8Measuring points for Rated Value No.14 (idling current) AL (CN63-CN64)

AR (CN45-CN46) BL (CN57-CN58) BR (CN51-CN52)

F

Postscript) 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 0.2	)
*When not mounted on main Main Heat Sink --- 20mV (100mA	0.2 )

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RS-A9/EW

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