Yamaha imx644 Service Manual page 33

No. Item
7 Signal level and [SIGNAL/PEAK] indi-
cator of MONO INPUT 1 to 6
(PAD ON)
8 Signal level and [SIGNAL/PEAK] indi-
cator of STEREO INPUT 1 L/R to 2 L/R
9 Signal level and [SIGNAL/PEAK]
indicator of STEREO INPUT 3L/R to
4A L/R
10 Signal level and [SIGNAL/PEAK]
indicator of STEREO INPUT 4A L/R
11 Audibility of STEREO 4B
12 Frequency response of MONO INPUT
1 to 6
13 Frequency response of STEREO INPUT
1L/R to 4A L/R.
Specification
• Confirm that the output voltage at OUTPUT 1 L to
OUTPUT 4 is +4 dBu ±2 dB.
• Confirm that the output level difference between
each OUTPUT is within 1.5 dB.
• Confirm that the [SIGNAL/PEAK] indicator of the
corresponding channel lights GREEN.
• Confirm that the output voltage at OUTPUT 1 L to
OUTPUT 1 R is +4 dBu ±2 dB.
• Confirm that the output level difference between
each OUTPUT is within 1.0 dB.
• Confirm that the [SIGNAL/PEAK] indicator of the
corresponding channel lights GREEN.
• Confirm that the output voltage at OUTPUT 2 L to
OUTPUT 2 R is +4 dBu ±2 dB.
• Confirm that the output level difference between
each OUTPUT is within 1.0 dB.
• Confirm that the [SIGNAL/PEAK] indicator of the
corresponding channel lights GREEN.
• Confirm that the output voltage at REC OUT A L to
REC OUT A R is -1.8 dBu ±2 dB.
• Confirm that the output level difference between
each OUTPUT is within 1.0 dB.
• Confirm that the [SIGNAL/PEAK] indicator of the
corresponding channel lights GREEN.
• Play the CD player and listen to speakers. Confirm
that the sound is not interrupted.
• Confirm that the output voltage at 20 Hz is within
+0.5 dB/-1.5 dB when compared with the output
voltage at 1 kHz (0 dB).
• Confirm that the output voltage at 20 kHz is within
+0.5 dB/-1.5 dB when compared with the output
voltage at 1 kHz (0 dB).
• Confirm that the output voltage at 20 Hz is within
+0.5 dB/-1.0 dB when compared with the output
voltage at 1 kHz (0 dB).
• Confirm that the output voltage at 20 kHz is within
+0.5 dB/-1.0 dB when compared with the output
voltage at 1 kHz (0 dB).
Procedure
• All [PAD] switches: ON
• Input the 1 kHz, -40 dBu sine wave
to the channel to be checked.
• Input the 1 kHz, -21.8 dBu sine wave
to the channel to be checked.
• Input the 1 kHz, -21.8 dBu sine wave
to the channel to be checked.
• Input the 1 kHz, -11.8 dBu sine wave
to the channel to be checked.
• Connect the optical output terminal
of the CD player to the STEREO
INPUT 4B (OPTICAL) terminal of
this unit with an optical cable.
• Connect the REC OUT B (OPTICAL)
terminal of this unit to the OPTICAL
input terminal of the audio amplifier
with an optical cable.
• Connect the speakers to the speak-
er output terminals of the audio am-
plifier.
• All [PAD] switches: OFF
• Input the 1 kHz, 20 Hz, 20 kHz, -74
dBu sine wave to the channel to be
checked.
• Input the 1 kHz, 20 Hz, 20 kHz,
-21.8 dBu sine wave to the channel
to be checked.
IMX644
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