Yamaha PSR-E443 Service Manual page 31

TEST
LCD display
No.
FRomChk1
5
005
Pit Chk
9
009
Output R
11
011
Output L
12
012
AUX Chk
21
021
SW Chk
23
023
A. LED On
24
024
LCD On
30
030
LCD Off
31
031
Test descriptions, judging conditions, etc.
Checks the FROM connected to the CPU bus.
Confi rm that "FRom OK" is shown on the LCD.
Checks pitch accuracy.
Connect the frequency counter to the [PHONES/OUTPUT] jack. (Either L or R)
Confi rm that the correct signal is output. (441.0 Hz ± 0.2 Hz)
Amount of volume decay
Connect the level meter (with JIS-C filter) to the L/R of the [PHONES/OUTPUT] jack. (33 Ω load)
Turn the [MASTER VOLUME] to the minimum and measre the amount of volume decay.
· PHONES L, R: -72 dBu or less
Connect the level meter (with JIS-C filter) to the L/R of the [PHONES/OUTPUT] jack.
(33 Ω load)
Set the [MASTER VOLUME] to the maximum level and check the output level.
· PHONES L: -65.0 dBu or less · PHONES R: -2.0 dBu ± 2 dB
Connect the level meter (with JIS-C filter) to the L/R of the [PHONES/OUTPUT] jack.
(33 Ω load)
Set the [MASTER VOLUME] to the maximum level and check the output level.
· PHONES L: -2.0 dBu ± 2 dB · PHONES R: -65.0 dBu or less
Checks AUX In.
1) Connect the stereo mini plug (no-load resistance) to [AUX IN] jack when "AUX In" is shown
on the LCD.
2) When plug connection is detected, "AUX Out" is shown on the LCD.
3) Confi rm that the output level is as follows when input the signal of specifi ed level.
AUX IN Rch: 1kHZ, -24 dBu Input
Output level Lch: -55 dBu or less
AUX IN Rch: No input Lch: 1kHZ, -24 dBu Input
Output level Lch: 0 dBu±2 dB
4) After the above test is fi nished, disconnect the stereo mini plug. Then, confi rm that "AUX End"
is shown on the LCD.
Checks the switches, dials, knobs and LEDs on the panel.
Operate the each item as shown in the LCD.
When the operation is right, a sound is played at the prescribed pitch. (Refer to the Switch Test
Item List on the page 33.)
1) In the Dial item
"Up" is shown on the LCD, turn the encoder knob clockwise.
"Dwn" is shown on the LCD, turn the encoder knob counterclockwise.
2) In the Switch item
Press the button shown on the LCD one by one.
When the switch with LED is turned on, LED will light up.
If more than two switches are pressed at a time, "Over Two" is shown.
3) In the Knob item
"Lo" is shown on the LCD, turn the rotary knob fully counterclockwise.
"Hi" is shown on the LCD, turn the rotary knob fully clockwise.
"C" is shown on the LCD, turn the rotary knob to the center position.
Confi rm that "SW OK" is shown on the LCD after all items check are fi nished.
To cancel the operation halfway, press the lowest key (white key C1) to return to the item selection
display.
all the LEDs on the panel are turned on.
Confi rm that
Confi rm that all the dots on the LCD are turned on.
Confi rm that all the dots on the LCD are turned off.
Lch: No input
Rch: 0 dBu±2 dB
Rch: -55 dBu or less
PSR-E443
31