Test Program; Test Program List; How To Enter The Test Program; Proceeding Through The Test Program - Yamaha Portatone PSR-740 Service Manual

TEST PROGRAM

A. 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] jack at 33 ohms.
4) Jigs: foot switch, MIDI cable, floppy disk (2HD & 2DD)
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 [BACK] and [NEXT] 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. LCD (initial)
1 001: Version
2 002: Rom Chk1
3 003: Ram Chk1
004: WaveRomChk1 Checks the WAVE ROMs that are connected to the CPU
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7 007: FDD Chk
9 009: Eff1Ram Chk
10 010: Eff2Ram Chk
(PSR-740 only)
11 011: TG1 Chk
13 013: Pitch Chk
14 014: Output R
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.
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
Checks the effect RAM2
Outputs the sine wave by changing the channels in sequence from C1 to C6
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 +/- 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 monaural plugs of the level meter (with a JIS-C filter) to the [AUX OUT] jacks.
AUX OUT L: less than -50.0 dBm
PSR-740/PSR-640
PHONES R: -8.0 dBm +/- 2 dB
AUX OUT R: -6.0 dBm +/- 2 dB
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