Yamaha NHB32-C Service Manual page 35

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Following test items are tested one after another each time the "ENTER" key of the keyboard is pressed.
13 SW1 : SWITCH input test
Press the switches on the front panel in the order of [RECALL] → [
to the instruction on the screen.
14 LED : LED lighting test
1. Check that LED's on the front panel light up in the order as shown below.
2. Check that the 7 seg. LED's light one by one in the order of "0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ."
3. Check that all LED's light up at the end.
15 THR : Audio signal test
Set PATCH of NHB32-C (for jigs) to "01".
Check the input level of SLOT 1 and SLOT2 of DME32 (16 channels in all) at SLOT 3 (MY4-DA).
Check that the analog output of MY4-DA is 1kHz, +4dBu±2dB.
Monitor the CH1 input of SLOT1 with the oscilloscope and check that the sine wave is free from disturbance.
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Hear the CH1 input of SLOT 1 through the powered speaker, etc. and check that it is free from distortion and
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noise.
Monitor the CH1 input of SLOT2 with the oscilloscope and check that the sine wave is free from disturbance.
Hear the CH1 input of SLOT 2 through the powered speaker, etc. and check that it is free from distortion and
noise.
Reconnect the LAN cable (CAT5: cross cable) to the CobraNet [SECONDARY] side.
Set PATCH of NHB32-C (for jigs) to "02".
Check the input level of SLOT 1 and SLOT 2 of DME32 (16 channels in all) at SLOT 3 (MY4-DA).
Check that the analog output of MY4-DA is 1kHz, +4dBu±2dB.
Monitor the CH1 input of SLOT1 with the oscilloscope and check that the sine wave is free from disturbance.
Hear the CH1 input of SLOT 1through the powered speaker, etc. and check that it is free from distortion and
noise.
Monitor the CH1 input of SLOT2 with the oscilloscope and check that the sine wave is free from disturbance.
Hear the CH1 input of SLOT 2 through the powered speaker, etc. and check that it is free from distortion and
noise.
Using the BNC cable, connect the WORD CLOCK OUT terminal of DME32 and the [WORD CLOCK IN] terminal
of NHB32-C to be tested.
Select "05" for PATCH of NHB32-C for jigs.
Press the "ENTER" key of the keyboard.
Check the input level of SLOT1 and SLOT2 of DME32 (16 channels in all) at SLOT3 (MY4-DA).
The analog output of MY4-DA should be 1KHz, +4dBu±2dB.
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Make settings for PATCH "05" of NHB32-C for jigs as follows.
CH1 to CH8 input of [AES/EBU 1] is output to CH1 to CH8 of CobraNet.
CH1 to CH8 input of [AES/EBU 2] is output to CH9 to CH16 of CobraNet.
CH1 to CH8 input of CobraNet is output to CH1 to CH8 of [AES/EBU 1].
.
CH9 to CH16 input of CobraNet is output to CH1 to CH8 of [AES/EBU 2].
Set MASTER CLOCK to "NETWORK".
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Automatic judgment
NETWORK STATUS
LINK CONDUCT
1/2
LD216 LD224 LD201 LD202 LD203 LD214
LOCK
ERROR 1/2
LD221 LD207
LD226
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2 9
8
(SW201) (SW202) (SW203)
AES/EBU 1 AES/EBU 2
3/4 5/6 7/8 1/2 3/4 5/6 7/8
LD204 LD205 LD206 LD217
AES/EBU 3 AES/EBU 4
3/4 5/6 7/8 1/2 3/4 5/6 7/8
LD208 LD209 LD220 LD211 LD212 LD213 LD223
Q Q
3 6 7 1 3 1 5
co
.
9 4 2 8
] → [ ] → [WORD CLOCK] according
(SW204)
NETWORK
LD215
WORD CLOCK
IN
LD218
0 5 8 2 9 9 4 2 8
m
NHB32-C
9 9
9 9
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