Yamaha PSR-S750 Service Manual page 58

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PSR-S750/PSR-S950
Test No.
LCD display
9
009 : Output R Check
10
010 : Output L Check
11
011 : EQ Low Check
12
012 : EQ Mid Check
13
013 : EQ High Check
14
014 : SP MUTE Check
15
015 : DAC MUTE Check
16
016 : MUTE Check
58
Test descriptions, judging conditions, etc.
Checking the R channel output.
Set the [MASTER VOLUME] control to the maximum position in advance of testing.
* It is not possible to operate the VOLUME control while testing.
Connect a level meter (with a JIS-C fi lter) to each jack. (PHONES L, R, OUTPUT L/L+R, R)
Check the output level of the R channel. (1049 Hz (C5) sine wave) (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:
-60.0 dBu or less
Checking the L channel output.
Set the [MASTER VOLUME] control to the maximum position in advance of testing.
* It is not possible to operate the VOLUME control while testing.
Connect a level meter (with a JIS-C fi lter) to each jack. (PHONES L, R, OUTPUT L/L+R, R)
Check the output level of the L channel. (1049 Hz (C5) sine wave) (PHONES L, R: 33 Ω load,
OUTPUT L/L+R, R: 10 kΩ load (2 monaural jacks used simultaneously))
· PHONES L:
-0.2 ± 2 dBu
· OUTPUT L/L+R:
+5.3 ± 2 dBu
Test for factory inspection.
Checking EQ-LOW frequency. Check that sine wave at about 65.5 Hz (C1) is output with
specifi ed level of the L and R channel.
Sound production stops when returning to the selection screen with the [START/STOP] button.
Test for factory inspection.
Checking EQ-MID frequency. Check that sine wave at about 524 Hz (C4) is output with speci-
fi ed level and of the L and R channel.
Sound production stops when returning to the selection screen with the [START/STOP] button.
Test for factory inspection.
Checking EQ-HIGH frequency. Check that sine wave at about 4195 Hz (C7) is output with
specifi ed level of the L and R channel.
Sound production stops when returning to the selection screen with the [START/STOP] button.
Checks SP MUTE.
Sound is produced with about 1049Hz (C5) sine wave at a specifi ed level of the L and R chan-
nel. Switch between MUTE ON (sound muted) and MUTE OFF (sound produced) with the
[TAB 2 3] button.
[TAB 3]: The SP output is muted.
MUTE ON
[TAB 2]: The SP output is produced.
MUTE OFF
(The plug should be unconnected from the PHONES terminal.)
Checks DAC MUTE.
Sound is produced with about 1049Hz (C5) sine wave at a specifi ed level of the L and R chan-
nel. Switch between MUTE ON (sound muted) and MUTE OFF (sound produced) with the
[TAB 2 3] button.
[TAB 3]: The SP output and PHONES output are muted.
MUTE ON
[TAB 2]: The SP output and PHONES output are produced.
MUTE OFF
(The plug should be unconnected from the PHONES terminal when checking the SP output.)
Checking MUTE.
Set the [MASTER VOLUME] control to the maximum position in advance of testing.
* It is not possible to operate the VOLUME control while testing.
Sound is produced with about 1049Hz (C5) sine wave at a specifi ed level of the L and R chan-
nel. Switch between MUTE ON (sound muted) and MUTE OFF (sound produced) with the
[TAB 2 3] button.
Verify that MUTE relay is not stuck.
[TAB 3]: The SP output and PHONES output are muted.
MUTE ON
[TAB 2]: The SP output and PHONES output are produced.
MUTE OFF
(The plug should be unconnected from the PHONES terminal when checking the SP output.)
Check output level when MUTE ON is selected.
Connect a level meter (with a JIS-C fi lter) to each jack. (OUTPUT L/L+R, R)
Check the output level.
(OUTPUT L/L+R, R: 10 kΩ load (2 monaural jacks used simultaneously))
OUTPUT L, R: -35.0 dBu or less
PHONES R:
-0.2 ± 2 dBu
OUTPUT R:
+5.3 ± 2 dBu
PHONES R:
-45.0 dBu or less
OUTPUT R:
-60.0 dBu or less

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