Yamaha Tyros4, Service Manual

Page: 73 / 173

73
Tyros4
Test 11
Function: Pitch check
Description:
Set the [MASTER VOLUME] to the maximum level.
Connect a frequency counter to the [PHONES] jack. (Either L or R)
(Load should be 33
Ω . (30 Ω is acceptable as well: -0.6 dB))
Con fi rm that the frequency counter shows "441.00±0.22 Hz".
¡ Amount of volume decay:
Set the [MASTER VOLUME] to the minimum level.
Connect a level meter (JIS-C curve) to the L/R of
[PHONES] terminal.
(Load should be 33
Ω . (30 Ω is acceptable as well: -0.6 dB))
• PHONES L: -60.0 dBu or less
• PHONES R: -60.0 dBu or less
Displayed Message:
０１１：Ｐｉｔｃｈ Ｃｈｅｃｋ
Selected screen
０１１：Ｐｉｔｃｈ Ｃｈｅｃｋ
−−
When a sound is being produced.
Supplement:
Sound is stopped when the test item is quit.
Test 12
Function : Output Level R check
Description:
Connect a level meter (JIS-C curve) to each jack. ([PHONES]
L, R, [LINE OUT MAIN] L/L+R, R, [AUX OUT/LOOP SEND]
L/L+R, R, [TO SUB WOOFER R] L, R)
Set the [MASTER VOLUME] to the maximum level and
check the output level of the R channel.
[PHONES] L, R
(33
Ω load (30 Ω is acceptable as well: -0.6 dB))
• PHONES L: -45.0 dBu or less
• PHONES R: -1.5±2 dBu
[LINE OUT MAIN] L/L+R, R
(10 k
Ω load (2 monaural jacks used simultaneously))
• LINE OUT MAIN L/L+R: -65.0 dBu or less
• LINE OUT MAIN R:
+9.5±2 dBu
[AUX OUT/LOOP SEND] L/L+R, R
(10 k
Ω load (2 monaural jacks used simultaneously))
• AUX OUT/LOOP SEND L/L+R: -75.0 dBu or less
• AUX OUT/LOOP SEND R:
+5.0±2 dBu
[TO SUB WOOFER R] L, R
(470
Ω load (L side: between 6P–3P, R side: between
5P–3P, GND: 3P))
• TO SUB WOOFER R L: -55.0 dBu or less
• TO SUB WOOFER R R: +6.0±2 dBu
Disconnect the headphone and connect the optional speakers
to the left and right speaker terminals.
Con
fi rm that the sound comes out only right speaker.
Displayed Message:
０１２：Ｏｕｔｐｕｔ Ｒ Ｃｈｅｃｋ
Selected screen
０１２：Ｏｕｔｐｕｔ Ｒ Ｃｈｅｃｋ
−−
When a sound is being produced.
Supplement:
Sound is stopped when the test item is quit.