Pioneer RS-A9/EW manual Audio Unit Adjustment, RS-A7/EW

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6.2 AUDIO UNIT ADJUSTMENT

AThe items for adjusting audio unit are: 1 Offset voltage

2 Master clock

The adjustment for service should be served in the product condition, instead of in the unit condition. (Otherwise, it would require jigs.)

Both adjustments are capable by removing the bottom plate of product, the sealed case of Control Assy and black panel (IN/OUT-signal printed side) to expose the face A of audio unit.

Adjustment is done by using the following half-fixed resistance and the trimmer capacitor: For adjusting offset voltage --- VR2241, VR2271, VR2341, VR2371

For adjusting master clock --- TC3001

B(Measuring instruments to be used)

For adjusting offset voltage: Voltage measuring device such as a multi-meter

For adjusting master clock: Frequency counter or high-frequency probe

*For adjusting each of RS- A7, use RS- A9.

(Adjustment Requirements)

Operate the product in the following requirements and make adjustment within 2 or 3 minutes from the start of such operation.

C

No.	Item	Rated Value		Requirements
1	Offset Voltage	0 Below	10mV	Set volume value of Main Unit to - 72dB and
				reproduce CD without recording. *1
2	Master clock	24.576MHz	20Hz	Set volume value of Main Unit to - 72dB and
				reproduce CD without recording. *1

D

E

F

90

*1 : 23 tracks of test disc(YEDS-7)

Sensing pin land of AL2 : its equivalent land and GND

Sensing pin land of AR2 : its equivalent land and GND

Sensing pin land of BL2 : its equivalent land and GND

Sensing pin land of BR2 : its equivalent land and GND

(The measuring points for adjusting master clock)

TP3001 or its equivalent land and TP3002 or its equivalent GND

(Waveform Confirmation for Adjustment)

Waveform confirmation is required since the waveform may be deformed according to the type of probe to be used when adjusting master clock.

The waveform is basically a rectangular wave of 0 --- 3.3V (24.576MHz).

RS-A7/EW

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