Yamaha PSR-140 Service Manual download pdf (Page 24)

PSR-280/PSR-282

TEST PROGRAM

A. PREPARATION

1) PA-3B (AC adaptor) is used.

2) The volume is usually moved to the use position when no volume change is required.

3) Measuring instruments: frequency counter, level meter (with JIS-C filter)

Note: Connect a stereo plug to the [PHONES] jack at 33 ohms.

4) Jigs: foot switch, MIDI cable.

B. HOW TO ENTER THE TEST PROGRAM

AUTO MODE

While pressing the C3#, F3 and G3# keys, turn the [STANDBY/ON] switch on.

MANUAL MODE

While pressing the C2#, F2 and G2# keys, turn the [STANDBY/ON] switch on.

C. PROCEEDING THROUGH THE TEST PROGRAM

AUTO MODE

When the test program is started, the test is automatically executed.

When confirmation is necessary, the test program stops operating and waits for the instruction. At this time, press the

[START/STOP] button; the next test is automatically executed.

MANUAL MODE

The LCD will display “TEST” when entering the test program.

To select the program number, use the [-/NO] and [+/YES] buttons.

To execute the test, press the [START/STOP] button.

To proceed to the next test, press the [START/STOP] button.

D. TEST PROGRAM LIST

TEST NO.

001: Version

002: Rom Chk1

003: Ram Chk1

004: WaveRomChk1

011: TG1 Chk

013: Pitch Chk

014: Output R

015: Output L

019: Noise

020: SW,LED Chk

LCD (initial)

Displays ROM version

ROM (Program, Wave) versions are displayed alternately on the LCD.

Checks the ROM

The test results appear on the LCD.

Checks all the RAMs that are connected to the CPU

The test results appear on the LCD.

Checks the WAVE ROMs that are connected to the CPU

The test results appear on the LCD.

Outputs the sine wave by changing the channels in sequence from C1 to C4

After auto-scaling is finished, individual keys can be played. (If playing two or more keys

simultaneously, the first pressed key has priority to make a sound.)

Connect the frequency counter to the [PHONES] jack.

Sets PAN to Center and produces a signal at 440 +/- 1.76 Hz

Check that the correct signal is produced.

Connect the level meter (with a JIS-C filter) to the [PHONES] jack. (33 ohm load)

Set the [MASTER VOLUME] at maximum and check the output level (1 kHz).

PHONES L: less than -53.0 dBm PHONES R: -6.0 dBm +/- 2 dB

Connect the level meter (with a JIS-C filter) to the [PHONES] jack. (33 ohm load)

Set the [MASTER VOLUME] at maximum and check the output level (1 kHz).

PHONES L: -6.0 dBm +/- 2 dB PHONES R: less than -53.0 dBm

Connect the level meter (with a JIS-C filter) to the [PHONES] jack. (33 ohm load)

Set the [MASTER VOLUME] at maximum. Check D/A converter noise.

PHONES L/R: Less than -78.0 dBm

Check the switches on the panel.

Press the switches that are displayed on the LCD. A pre-assigned note is output when pressing

the switch.

The test results appear on the LCD.

Test Functions and Judgment Criteria

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Yamaha PSR-140 Service Manual Page 24

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