Yamaha TF5 Service Manual page 156

TF5/TF3/TF1
7-15. HA GAIN
The example of a screen of the product test.
7-15-1. HA_GAIN_1 (INPUT1-8)
[Contents]
Inspect the HA GAIN circuit of HAAD circuit board
(INPUT1-8).
It is automatically determined whether the level stays within
the assumed range by feeding a signal of level -45dBu into
each input terminal, and monitoring the levels by the DSP
meter function while switching the HAGAIN.
[Procedure]
Input the signal of the level of -45dBu into INPUT1-8 in
advance.
<GUI>
Automatic judgment
<Display of inspection log>
In the case of PASS, "PASS: HA_GAIN_1".
In the case of FAIL, the contents of failure are returned like
"FAIL: IN01 IN03".
IN01 HA GAIN circuit of INPUT1
IN02 HA GAIN circuit of INPUT2
: :
IN08 HA GAIN circuit of INPUT8
7-15-2. HA_GAIN_2 (INPUT9-16)
7-15-3. HA_GAIN_3 (INPUT17-24)
7-15-4. HA_GAIN_4 (INPUT25-32)
[Contents]
Although the target of the inspection replaces INPUT9-16,
INPUT17-24 or INPUT25-32, the contents are the same as
that of "7-15-1. HA_HGAIN_1".
"7-15-3. HA_HGAIN_3" function is for TF5 and TF3.
"7-15-4. HA_HGAIN_4" function is for TF5 only.
156
7-16. MEASUREMENT SETTING
If the "MEASURMENT SETTINGS" screen is started from
the starting screen, the screen as shown in the above fi gure
will be displayed.
This screen performs only setups of the hardware for
measuring characteristic of inputs and outputs, etc. And this
screen does not have inspection functions.
By pushing the button of each function, each setup is
performed and the following popup screen is displayed.
7-16-1. HAAD12_MAX (INPUT)
[Contents]
The signals inputted into INPUT1-16 are outputted to OMNI
OUT 1-16.
The HA GAIN setting at that time is +66dB.
The concrete setup is as follows.
INPUT HA GAIN
INPUT 1 +66dB
INPUT 2 +66dB
: :
INPUT16 +66dB
[Procedure]
Push the [HAAD12_MAX] button in the MEASUREMENT
SETTING screen. TF becomes the setup mentioned above
and the following popup dialog is displayed.
<GUI>
[ HAAD12_MAX ]
INPUT 1 – 16 Max gain setting (+66dB) - > OMNI 1-16
BREAK
● Take measurements with these settings, according to
TEST SPEC "A. INPUT-OMNI OUT Gain max.".
(See page 159.) When measurement is completed, push
[BREAK] button. Popup dialog is closed and the setup is
canceled.
OUTPUT
g
OMNI OUT 1
g
OMNI OUT 2
:
g
OMNI OUT16