Yamaha PORTATONE PSR-170 Service Manual page 15

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TEST PROGRAM
1. PREPARATION
1) PA-3B or PA-3(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
2. HOW TO ENTER THE TEST PROGRAM
While pressing the C2#, F2 and G2# keys, turn the
[STANDBY/ON] switch on.
4. TEST PROGRAM LIST
TEST No.
1 [001] Version
2 [002] Rom Chk1
[003] Ram Chk1
3
[011] TG1 Chk
11
13 [013] Pit Chk
14 [014] Output R
15 [015] Output L
19 [019] Noise
[020] SW Chk
20
LCD (initial)
Displays ROM version.
ROM (Program) versions are displayed alternately on the LCD.
Checks the ROM.
The test results appear on the LCD.
Checks the RAM. (GEW12)
The test results appear on the LCD.
Outputs the sine wave by changing the channels in sequence from C2 to D#3.
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).
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).
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.
Check the switches on the panel.
Press the switches on the LCD as instructed. A pre-assigned note is output when the
switch is pressed (See table 1.). As the check result appears on the LCD when all the
switches are pressed as instructed,. Check that OK is displayed. (To stop this check
before reaching its end, press the lowest (leftmost) white key on the keyboard to return
to the test item name on display.
Digitized in Heiloo the Netherlands
3. PROCEEDING THROUGH THE TEST
PROGRAM
1) When the test program is started, "TEST" appears on the
LCD.
2) Select the test program item to be executed by pressing
the [-/NO] or [+/YES] button.
3) Press the [START/STOP] button to execute testing.
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 [-/NO] or [+/
YES] button.
When the test result is OK, a cursor (_) is added under
the first character of the test item name on display.
When the test result is NG, press 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.
Test Functions and Judgment Criteria
PHONES L : less than -60.0 dBm
PHONES L : -24.5 dBm +/- 2 dB
PHONES L/R : Less than -75.0 dBm
PHONES R : -24.5 dBm +/- 2 dB
PHONES R : less than -60.0 dBm
3/24/2019
PSR-170
15
Not for sale!