Yamaha imx644 Service Manual page 34

IMX644
No.
14 Noise level of MONO INPUT 1 to 6
15 Residual output noise of OUTPUT 1 L/
R, 2 L/R, 3, 4
16 Residual output noise of REC OUT A
L/R
17 Total harmonic distortion
MONO INPUT 1 to 6
→ OUTPUT 1 L/R, 2 L/R, 3, 4
34
Item
• -42 dBu or less (IHF-A)
• -82 dBu or less (DIN-A)
• -50 dBu or less (DIN-A)
• -87.79 dBu or less (DIN-A)
• -67.79 dBu or less (DIN-A)
• -73.79 dBu or less (DIN-A)
• 0.1 % or less
Specification Procedure
• All [PAD] switches: OFF
• IHF-A
• Set volume controls of the channel
to be checked to the maximum posi-
tion.
• Set volume controls of the channels
not to be checked to the minimum
position.
• Short circuit the input terminal of
the channel to be checked by 150 Ω
as shown in figure 9.
H C G
150 Ω
Figure 9
• All volume controls: MIN
• DIN-A
• Press and hold the MEMORY [B]
button for 2 seconds or longer.
• All [PAD] switches: ON
• MONO INPUT volume controls:
MAX
• OUTPUT volume controls: MAX
• STEREO INPUT volume controls:
MIN
• DIN-A
• All volume controls: MIN
• DIN-A
• Press and hold the MEMORY [A]
button for 2 seconds or longer.
• MONO INPUT volume controls:
MIN
• OUTPUT volume controls: MIN
• STEREO volume controls: MAX
• DIN-A
• STEREO volume control of the
channel to be checked: MAX
• STEREO volume controls of the
channel not to be checked: MIN
• DIN-A
• All [PAD] switches: ON
• Input the 1 kHz, -20 dBu sine wave
to the channel to be checked.
• 22 kHz LPF
• Set the volume control of the channel
to be checked as shown in figure 10.
Figure 10