External Test
Check clock 1 MHz PC I/F
Check Switch and LED
First switch to verify ARR/PLAY
Make the switch sequence as the display show
Check display LCD
All icons are light
All middle segment are >>>>>>>>
All middle segment are <<<<<<<<<
All middle segment are #########
All middle segment are 88888888
All middle segment are XXXXXXXX
Master volume MAX (use a oscilloscope)
MDE wave Left
1 kHz, from 10 to 11.5Vpp
MDE wave Right
1 kHz, from 10 to 11.5Vpp
Wave OUT L
1 kHz, from 10 to 11.5Vpp
Wave OUT R
1 kHz, from 10 to 11.5Vpp
Wave OUT 1
1 kHz, from 10 to 11.5Vpp
Wave OUT 2
1 kHz, from 10 to 11.5Vpp
Wave OUT Headphone L
440Hz, from 1.8 to 3.2Vpp
Wave OUT Headphone R
880Hz, from 1.8 to 3.2Vpp
Pot. IN GAIN minimum, LED SIGNAL green,
put a input signal wave with 0db of amplitude and frequencies as follow:
IN 1 - OUT L
100Hz , -3.0dBV <= level <= -1.0dBV
IN 2 - OUT R
100Hz , -3.0dBV <= level <= -1.0dBV
IN 1 - OUT L
1kHz , -3.0dBV <= level <= -1.0dBV
IN 2 - OUT R
1kHz , -3.0dBV <= level <= -1.0dBV
IN 1 - OUT L
10kHz , -3.0dBV <= level <= -1.0dBV
IN 2 - OUT R
10kHz , -3.0dBV <= level <= -1.0dBV
IN 1 - OUT 1
100Hz , -3.0dBV <= level <= -1.0dBV
IN 2 - OUT 2
100Hz , -3.0dBV <= level <= -1.0dBV
IN 1 - OUT 1
1kHz , -3.0dBV <= level <= -1.0dBV
IN 2 - OUT 2
1kHz , -3.0dBV <= level <= -1.0dBV
IN 1 - OUT 1
10kHz , -3.0dBV <= level <= -1.0dBV
IN 2 - OUT 2
10kHz , -3.0dBV <= level <= -1.0dBV
In L -HMB- Out L
100Hz , 1.0dBV <= level <= 3.0dBV
In R -HMB- Out R
100Hz , 1.0dBV <= level <= 3.0dBV
In L -HMB- Out L
1kHz , 1.0dBV <= level <= 3.0dBV
