Dolby B/C Nr Adjustment; Asl Adjustment; Preset Conditions - Pioneer ES300 Service Manual

DOLBY B/C NR ADJUSTMENT

No. Test Tape
1 NCT-150
(400Hz,200nwb/m)

ASL ADJUSTMENT

Preset conditions

1. Set VR301 and VR351 around the center of the adjustable range.
2. Ground pins 3 and 16 of IC301.
Step Input
No. (MIC)
1 By using an oscillator, apply a sine
wave of 7Hz/2.0mV to the MIC
terminal (+) via a 600-ohm resistor.
2 By using an oscillator, apply a sine
wave of 7Hz/20mV to the MIC
terminal (+) via a 600-ohm resistor.
3 Repeat Steps 1 and 2 until doth adjustments satisfy the specifications.
4 By using the jig(CAN-906,CAN-912),
apply a sine wave of 100dB-SPL
voltage directly to the MIC terminal.
5 End
TOP VIEW
MOTHER PCB
KEX-M8196ZT,M8196ZT-91,M8396ZT-02,M8396ZT-92
Adjustment Point
VR301(Lch),VR302(Rch)
Output
(Pin 22 of IC301)
Observe the output at
Pin 22 on a DC voltmeter
(pointer-type).
Observe the output at
Pin 22 on a digital
multimeter.
Observe the output at
Pin 22 on a digital
multimeter.
VR351
22pin
VR301
DC volt meter
Digital multi
meter
DC Regulated
Power Supply
GND
MUTE
SLD FL FR
BEEP
GND RL RR
CN901
MOTHER PCB
Adjustment Method
(Switch Position)
mV Meter(2) : –8.24dBs+1.5dB,-0.5dB
(DOLBY NR Switch : OFF)
Adjustment
Adj.point Spec.
VR351 1.8±0.3V
VR301 5.2±0.1V
VR351 5.2±0.1V
BOTTOM VIEW
MIC
MOTHER PCB
13.2V
TEL
AMPB ILL+ BU
MUTE
SGND
ANTB ILL- ACC
CN901
CN902
Conditions
Pin 16:Ground
Pin 3:Open
Wait for 20 seconds.
Pin 16:Ground
Pin 3:Ground
Pin 16:Ground
Pin 3:Ground
Oscillator
600Ω
59