Inspections - Yamaha P-200 Service Manual

INSPECTIONS

1. Preparations
1-1. Power supply voltage
Before testing for specifications, confirm AC line
voltage is the rated value +/- 2 %.
1-2. Measuring Equipment
The level meter should have a JIS-C filter. The input
impedance of the oscilloscope should be more than 1
M ohms.
1-3. Measuring Point
Unless specified, measure the signal at the PHONES
(L) jack.
1-4. Controls
Unless specified, set the controls and jacks as follows:
POWER SW:
VOLUME:
CS:
SPLIT:
TRANSPOSE:
MIDI:
STORE:
EDIT:
PERF. A:
PERF. B:
VOICE SW:
EFFECT REVERB:
EFFECT MODULATION:
EQUALIZER LOW:
EQUALIZER MIDDLE:
EQUALIZER HIGH:
PITCH (WHEEL):
MODULATION (WHEEL): Minimum
SUSTAIN:
SOFT:
SOSTENUTO:
OUTPUT (L/MONO, R):
INPUT (L/MONO, R):
MIDI (IN, OUT, THRU):
FOOT CONTROLLER:
SPEAKER ON/OFF:
ON
Maximum
Minimum
Default Setting
Default Setting
Default Setting
Default Setting
Default Setting
Default Setting
Default Setting
PIANO 1 (SINGLE
MODE)
OFF
OFF
CENTER
CENTER
CENTER
CENTER
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
ON
2. INSPECTIONS
2-1. PITCH
Press the [A3] key on the keyboard, and check that the
pitch of the output signal is 440 Hz +/- 3 cents.
2-2. INPUT/OUTPUT LEVELS
2-2-1. Activate the test program, and press the [B0]
key on the keyboard to generate a sine wave of
1 kHz (refer to TEST PROGRAM section for
details). Insert appropriate phone plugs into
each output jacks and check PHONES (L/R)
and OUTPUT (L/R) outputs using an
oscilloscope or a level meter (with JIS-C
filter). Listed below are the specifications of
each output during this test.
PHONES (L):
PHONES (R):
OUTPUT (L/MONO): -2 +/- 3 dBm
OUTPUT (R):
When the plug connected to the OUTPUT (R)
is disconnected, the specification of the
OUTPUT (L/MONO) is as follow:
OUTPUT (L/MONO): -3 +/- 3 dBm
2-2-2. When a sine wave of 1 kHz, - 20 dBm is
applied to the INPUT (L/MONO) jacks, the
specifications and conditions of each output
are as follows during the test.
PHONES (L):
PHONES (R):
OUTPUT (L/MONO): -8 +/- 3 dBm
OUTPUT (R):
2-3. NOISE LEVEL
The noise level at both L and R outputs should be less
than -72 dBm if any voice or reverb effect mode is
selected.
P-200
+19 +/- 3 dBm
+16 +/- 3 dBm
-5 +/- 3 dBm
+13 +/- 3 dBm
+13 +/- 3 dBm
-8 +/- 3 dBm
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