Yamaha PSR-S710 Service Manual page 62

PSR-S710/PSR-S910
Test No. LCD display
6 006 : Effect RAM Check1
OK:
006 : Effect RAM Check1
OK
NG:
006 : Effect RAM Check1
TG1 (IC *** ) NG
*** : Location Number of IC
7 007 : TG 1 Check
OK:
007 : TG 1 Check
End
10 010 : Pitch Check
11 011 : Output R Check
12 012 : Output L Check
Noise Level
13 013 : EQ Low Check
14 014 : EQ Mid Check
15 015 : EQ High Check
18 018 : MUTE Check
MUTE OFF:
018 : MUTE Check
OFF
MUTE ON:
018 : MUTE Check
ON
62
Test descriptions, judging conditions, etc.
Checking the Effect RAM connected to the TG bus. (Simplifi ed check)
Check that "Effect RAM Check1 OK" is displayed on LCD.
Case PSR-S710
TG1 (IC305) NG
Checking the tone generator 1.
Sequentially outputs the sine wave starting from the low keys and switching sounds of the tone generator.
(32 notes from C2 to G4) Check that there is no abnormal sounds or noise.
"TG 1 Check End" will appear when the test is over.
Checking sound pitch.
Pitch accuracy check:
Connect a frequency counter to the [PHONES] jack. (Either L or R)
When the test is started, a sine wave of (441 ± 0.2 Hz) will be played. (PAN=Center)
Amount of volume decay:
Connect a level meter (with a JIS-C fi lter) to the L/R of the [PHONES] jacks.
Set the [MASTER VOLUME] to the minimum. Load should be 33 Ω.
Check that the amount of decay is 75.0 dB or more for both L and R of the [PHONES] jack.
Checking the R channel output.
Connect a level meter (with a JIS-C fi lter) to each jack. (PHONES L, R, OUTPUT L/L+R, R)
Set the [MASTER VOLUME] to the maximum level and check the output level of the R channel.
(1 KHz sine wave, PAN=R) (PHONES L, R: 33 Ω load, OUTPUT L/L+R, R: 10 kΩ load (2 monaural
jacks used simultaneously))
· PHONES L: -45.0 dBu or less
· OUTPUT L/L+R: -40.0 dBu or less
Checking the L channel output.
Connect a level meter (with a JIS-C fi lter) to each jack. (PHONES L, R, OUTPUT L/L+R, R)
Set the [MASTER VOLUME] to the maximum level and check the output level of the L channel.
(1 KHz sine wave, PAN = L) (PHONES L, R: 33 Ω load, OUTPUT L/L+R, R: 10 kΩ load (2 monaural
jacks used simultaneously))
· PHONES L: -2.6 ± 2 dBu
· OUTPUT L/L+R: +9.1 ± 2 dBu
After the test 12 is completed, connect the level meter (with a JIS-C fi lter) to the L/R of the [PHONES]
jacks and check the noise level. (PHONES L, R: 33 Ω load)
· PHONES L: -80.0 dBu or less
Checking EQ-LOW frequency. Check that sine wave at about 65.4 Hz (C1) is output with specifi ed level
and PAN=Center. Sound production stops when returning to the selection screen with the [START/STOP]
button.
Checking EQ-MID frequency. Check that sine wave at about 523 Hz (C4) is output with specifi ed level
and PAN=Center. Sound production stops when returning to the selection screen with the [START/STOP]
button.
Checking EQ-HIGH frequency. Check that sine wave at about 4186 Hz (C7) is output with specifi ed level
and PAN=Center. Sound production stops when returning to the selection screen with the [START/STOP]
button.
Checking MUTE. Set the [MASTER VOLUME] to the maximum level.
Connect a level meter (with a JIS-C fi lter) to the L/R of the [PHONES] jack. (33 Ω load) When the test is
started with the [START/STOP] button, sounds can be played (MUTE OFF) and "MUTE Check OFF" is
displayed on the LCD.
Mute sounds (MUTE ON) with the [TAB 2] button and "MUTE Check ON" is displayed on the LCD.
Cancel the mute function (MUTE OFF) with the [TAB 3] button and "MUTE Check OFF" is displayed
on the LCD.
Check output level when [MUTE ON] is selected.
PHONES L, R: -80.0 dBu or less
Case PSR-S910
TG1 (IC306) NG
PHONES R: -2.6 ± 2 dBu
OUTPUT R: +9.1 ± 2 dBu
PHONES R: -45.0 dBu or less
OUTPUT R: -40.0 dBu or less
PHONES R: -80.0 dBu or less