Jitter Measurement; Word Clock Int; Tests In Normal Operation; Checking Of Midi Thru Operations - Yamaha DME24N Service Manual

DME24N/DME64N
i Gain, Distortion (Both L and R): INT 48kHz
Input Frequency Permissible range Permissible range
(Output Level)
1kHz +0.5dBu±1dBu
o MUTE Operation (Both L and R): INT 48kHz
Input Frequency Permissible range
1kHz -30dBu or below

2-1-5. Jitter Measurement

Conditions
· Insert MY8-AE96 into MY-SLOT, and test it with
OUTPUT1-2.
· Perform the test by using the testing item No. 27 in
the test category "02. Product (JITTER)" of the test
program.
a. WORD CLOCK INT
Conditions
· Measure by using test No. 1-4 of 1-27. JITTER Test
in the test program.
q Jitter
Test No. WORD CLOCK
1 INT 44.1kHz
2 INT 48kHz
3 INT 88.2kHz
4 INT 96kHz
b. WORD CLOCK EXT.WORD CLOCK IN
Conditions
· Measure by using test No. 5 of 1-27. JITTER Test in
the test program.
Select a following value for the Frequency Setting
(Sample Rate) provided to WORD CLOCK IN.
q Jitter (WORD CLOCK IN Input)
Test No. WORD CLOCK
5 44.1kHz
5 48kHz
5 88.2kHz
5 96kHz
86
(Distortion factor)
0.1% or below
(Output Level)
Permissible range
2n sec or below
2n sec or below
2n sec or below
2n sec or below
Permissible range
5n sec or below
5n sec or below
8n sec or below
8n sec or below
c. WORD CLOCK EXT.SLOT
Conditions
· Measure by using test No. 6 of 1-27. JITTER Test in
the test program.
Select a following value for the Frequency Setting
(Sample Rate) provided to SLOT.
q Jitter (WORD CLOCK IN Input)
Test No. WORD CLOCK
6 44.1kHz
6 48kHz
6 88.2kHz
6 96kHz

2-2. Tests in Normal Operation

2-2-1. Checking of MIDI THRU Operations

Check that the data input into MIDI IN is output to MIDI
THRU as it is.
2-2-2. Checking of Ether NET Terminal Operations
Connect a tested product (DME24N) with a completed
product test jig (ICP1), start both units in the normal
operation mode, and then change scenes on the tested
product (DME24N). At that time, check that LCD displays
(SCENE No. and SCENE name) on the tested product
(DME24N) and the completed product test jig (ICP1)
are synchronized and agree with each other.
2-2-3. Sounding Test
Check by listening the following items.
Conditions
· Input an audio signal into 1/2ch of ANALOG IN, and
check and listen with 1/2ch output of ANALOG OUT.
Inspections
· After recalling SCENE NUMBER 1, listen a music
signal for 15 sec. or longer, and check the following
items.
q Effect sound is generated.
w No noise is generated.
· In similar manner, listen SCENE2 through 32.
(However, SCENE19, 24, 25, and 30 should be
considered as "No SCENE", and listening is not
performed.)
Relations between SCENE No. and EFFECT TYPE
are described as the following page.
Permissible range
8n sec or below
8n sec or below
10n sec or below
10n sec or below