Yamaha YPT-340 Servis Kılavuzu - Sayfa 27

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Ayrıca Yamaha YPT-340 için: Referans (3 sayfalar)

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TEST
LCD display
No.
005: FRomChk1
5
009: Pit Chk
9
011: Output R
11
012: Output L
12
021: AUX Chk
21
023: SW Chk
23
030: LCD On
30
031: LCD Off
31
035: PD1 Chk
35
041: MIDI Chk
41
045: Volt Chk
45
055: Rom Chk2
55
056: Ram Chk2
56
Test descriptions, judging conditions, etc.
Checks the FROM connected to the CPU bus (simplifi ed check).
Make sure that "FRom OK" is displayed on the LCD.
Checks pitch accuracy.
Connect the frequency counter to the [PHONES/OUTPUT] jack. (Either L or R)
Make sure that the correct signal is output. (441.0 Hz ± 0.2 Hz)
Amount of volume decay
Connect the level meter (with JIS-C filter) to the L/R of the [PHONES/OUTPUT] jack. (33 Ω load)
Turn the [MASTER VOLUME] to the minimum and measure the amount of volume decay.
· PHONES L, R: -70 dBu or less
Connect the level meter (with JIS-C filter) to the L/R of the [PHONES/OUTPUT] jack.
(33 Ω load)
Set the [MASTER VOLUME] to the maximum level and check the output level.
· PHONES R: –2.0 dBu ± 2 dB    · PHONES L: –45.0 dBu or less
Connect the level meter (with JIS-C filter) to the L/R of the [PHONES/OUTPUT] jack.
(33 Ω load)
Set the [MASTER VOLUME] to the maximum level and check the output level.
· PHONES L: –2.0 dBu ± 2 dB    · PHONES R: –45.0 dBu or less
Checks the [AUX-IN] terminal.
Confi rm that "AUX In" is displayed when any plug is not inserted into the [AUX-IN] terminal.
Confi rm that "AUX Out" is displayed when a plug is inserted into the [AUX-IN] terminal.
(10kohms load.)
Input a sine wave (1kHz, -24dBu) into R ch of [AUX IN] terminal. (Do not input any signal into
the L ch of [AUX IN] terminal.) Confi rm that the output level at each terminal is as follows.
PHONES R: -2.0 dBu ± 2 dB
PHONES L: -55.0 dBu or less
Also, confi rm that the output level at each terminal is reversed when L and R ch are reversely
inputted.
When the plug is disconnected from the [AUX IN] terminal, "AUX End" is displayed on the
LCD.
Checks the switches on the panel. Press the switches as shown in the LCD. When a switch is
pressed, a sound is played at the prescribed pitch. (Refer to the Switch test item list on the next
page.)
Make sure that "SW OK" is displayed on the LCD when all the switches are pressed as indicated.
If more than two switches are pressed at a time,
To cancel the running test, press the [DEMO] button or the lowest key (white key C1) to
return to the item selection display.
Make sure that all the dots on the LCD are turned on.
Make sure that all the dots on the LCD are turned off.
Before power switch ON, Connect a footswitch (FC-4 or FC-5) to the [SUSTAIN] jack.
Check that C3 sound is played when the [Start/Stop] button is pressed with the pedal released and
that C4 sound is played when the pedal is depressed. Released the pedal again and the sound
will be stopped.
Make sure that "PD1 OK" is displayed on the LCD.
Connect the PC with a USB-MIDI driver installed and the [USB TO HOST] terminal using a
USB cable, and execute the test.
(As for the PC, install a USB-MIDI driver in the PC and fi nish the THROUGH setup, in
advance.)
Confi rm that the C4 sound is played and the LCD displays "MIDI OK".
Insert the plug of the AC adapter into a DC-IN 12V jack.
Make sure that "Volt OK" is displayed on the LCD.
Checks the ROM connected to the CPU bus. (Full address)
Make sure that "Rom OK" is displayed on the LCD.
It will take about 25 seconds for the check.
Checks the RAM connected to the CPU bus. (Full address)
Make sure that "Ram OK" is displayed on the LCD.
PSR-E343/PSR-E344/YPT-340
Over Two
is displayed.
"
"
27