PIONEER GM8886
Manual de Servicio

GM-8886ZT ,8886ZT-91

ASL SECTION
Preset conditions 1. Set VR601 and VR602 around the center of the adjustable range. 2. Ground pins 3 and 16 of IC601. Step Input Output No. (MIC) (Pin 22) Adj.point 1 By using an oscillator, apply a sine Observe the output at VR602 wave of 7Hz/3.6mV to the MIC Pin 22 on a DC V meter terminal (+) via a 600-ohm resistor. (pointer-type). 2 By using an oscillator, apply a sine Observe the output at VR601 wave of 7Hz/64mV to the MIC Pin 22 on a digital terminal (+) via a 600-ohm resistor. multimeter. 3 Repeat Steps 1 and 2 until doth adjustments satisfy the specifications. 4 By using the jig(CAN-906,CAN-912), Observe the output at VR602 apply a sine wave of 7Hz/100dB-SPL Pin 22 on a digital directly to the MIC. multimeter. 5 End To connect the Amp unit and the DSP unit, use Jig GGD1153.

Adjustment Spec. Conditions 1.3±0.3V Pin 16:Ground Pin 3:Open Wait for 20 seconds. 4.6±0.1V Pin 16:Ground Pin 3:Ground

3.6±0.1V

Pin 16:Ground Pin 3:Open

TOP VIEW

BOTTOM VIEW

Oscillator
600�

DSP UNIT
VR602

DSP UNIT

MIC

22pin VR601

DC V meter Digital multi meter

13.2V

DC Regulated Power Supply

13.2V

MUTE

SGND

L+

R+

BU

FL+

FR+

RL+

RR+

ACC

BUS+ BUS-

L-

R-

GND

TLMT

GND

FL-

FR-

RL-

WF-

WF+

RR-

CN903

CN901

CN903

CN902

CN901

AMP UNIT

24