Yamaha imx644 Service Manual page 32

IMX644
4. Inspection Method
No.
1 [POWER] indicator
2 Matrix indicators and MEMORY button's
indicators
3 [GPI] connector
4 [SIGNAL/PEAK] indicator of MONO
INPUT 1 to 6
5 [SIGNAL/PEAK] indicator of STEREO
INPUT 1 L/R to 4A L/R
6 Signal level and [SIGNAL/PEAK] indi-
cator of MONO INPUT 1 to 6
(PAD OFF)
32
Item
• Confirm that the [POWER] indicator lights GREEN. Under the test conditions.
• Confirm that the matrix indicators and MEMORY
button's indicators light as shown in figure 8.
MATRIX
indicator
➀ Confirm that the status between [POWER MONITOR
HOT] (24pin) and [POWER MONITOR COLD] (25pin)
is ON.
Example circuit
Power ON
➁ Short circuit [INPUT 1] (No.3 pin) and GND, confirm
that the status between [OUTPUT 1] (No. 14 pin)
and GND becomes ON.
Open circuit [INPUT 1] (No.3 pin) and GND, confirm
that the status between [OUTPUT 1] (No. 14 pin)
and GND becomes OFF.
➂ Test [INPUT 2] to [INPUT 8] in the same manner.
Example circuit
CPU
CPU
• Confirm that the [SIGNAL/PEAK] indicator of
corresponding channel lights RED.
• Confirm that the [SIGNAL/PEAK] indicator of
corresponding channel lights RED.
• 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.
Specification
MEMORY
Lighting
Lighting
Lighting Lighting
Figure 8
IMX644
POWER
Max. 30mA
MONITOR
110
HOT
Lit
POWER
MONITOR
COLD
IMX644
+5V
1K
INPUT
47K
GND
22K
IMX644
Max. 30mA
110 OUTPUT
Lit
GND
Procedure
Under the test conditions.
Under the test conditions.
Connector Pin Assignments
13 12 11 10 9 8 7
25 24 23 22 21 20
Max. +35V
Pin
Signal Name
No.
1 GND
2 GND
3 INPUT 1
4 INPUT 2
5 INPUT 3
6 INPUT 4
7 INPUT 5
8 INPUT 6
9 INPUT 7
10 INPUT 8
11 GND
12 GND
13 GND
14 OUTPUT 1
15 OUTPUT 2
16 OUTPUT 3
17 OUTPUT 4
18 OUTPUT 5
19 OUTPUT 6
20 OUTPUT 7
21 OUTPUT 8
22 GND
23 GND
Max. +35V 24 POWER MONITOR HOT
25 POWER MONITOR COLD
• All [PAD] switches: OFF
• Input the 1 kHz, -40 dBu sine wave
to the channel to be checked.
• Input the 1 kHz, +12.2 dBu sine wave
to the channel to be checked.
• All [PAD] switches: OFF.
• Input the 1 kHz, -74 dBu sine wave
to the channel to be checked.
6 5 4 3 2 1
19 18 17 16 15 14