Test Program - Yamaha Portatone PSR-550 Service Manual

PSR-550

TEST PROGRAM

1. PREPARATION
1) PA-6 (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/OUTPUT]
jack at 33 ohms.
4) Jigs : foot switch, MIDI cable, floppy disk (2HD & 2DD)
2. HOW TO ENTER THE TEST PROGRAM
MANUAL MODE :
While pressing the C2#, F2 and G2# keys, turn the
[STANDBY/ON] switch on.
4. TEST PROGRAM LIST
TEST No. LCD (initial)
001:Version
1
002:Rom Chk1
2
003:Ram Chk1
3
004:WaveRomChk1
4
7 007:FDD Chk
009:Eff1Ram Chk
9
011:TG1 Chk
11
013:Pitch Chk
13
014:Output R
14
015:Output L
15
016:EQ Low
16
017:EQ Mid
17
018:EQ High
18
28
3. PROCEEDING THROUGH THE TEST
PROGRAM
MANUAL MODE :
1) When the test program is started, "TEST" appears on
2) Select the test program item to be executed by pressing
3) Press the [START/STOP] button to execute testing.
Test Functions and Judgment Criteria
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.
Insert the floppy disks one by one (2DD and 2HD).
Checks the floppy disk drive unit.
Checks the effect RAM1.
Check by hearing that the sound of C3 is produced and no noise is heard.
Outputs the sine wave by changing the channels in sequence from C2 to G4.
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.)
If the [VOICE R1] button is pressed, that effect is applied when the sound is produced.
Connect the frequency counter to the [PHONES] jack.
Sets PAN to Center and produces a signal at 440 +/- 0.22 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 -50.0 dBm
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 : -11.0 dBm +/- 2 dB
Check the sine wave output at about 65.4Hz (C1).
Check the sine wave output at about 523Hz (C4).
Check the sine wave output at about 4186Hz (C7).
the LCD.
the [BACK] or [NEXT] button.
When the test result is OK, press the [START/STOP]
button to return to the test item name on display.
Proceed to the next test by pressing the [BACK] or
[NEXT] button.When the test result is OK, an asterisk
(*) is added in front of its item name on display.
When the test result is NG, press the [DEMO] button or
the lowest (leftmost) white key on the keyboard to return
to the test item name on display and then turn off the
[STANDBY/ON] switch to end the test program.
PHONES R : -11.0 dBm +/- 2 dB
PHONES R : less than -50.0 dBm