Power On Reset - Yamaha PORTATONE PSR-9000 Service Manual

PSR-9000
71. 071:PC Keyboard Chk
72. 072:Data Ver. Chk
73. 073:Factory Set
74. 074:Test Exit
Note: 0 dBm = 0.775V
5. Other
5-1 LCD Contrast
When the LCD CONTRAST knob is turned clockwise and counter-clockwise, confirm that the contrast is changes.
5-2 AUX IN
Apply a 1 kHz, -15 dBm, sine wave to the AUX IN L/L+R. Confirm that the output meets the following specifications:
PHONES (L, R):
When TRIM volume is at minimum, confirm that the output meets the following specifications:
PHONES (L, R):
5-3 MIC/LINE Input Level & Level Indicate LED
When the following input level are used with test program number 055, confirm that output levels are as follows:
V 1.00
MIC/LINE Input level
LINE -56.0 dBm
MIC 2 -56.0 dBm
MIC 1 -50.0 dBm
V 1.10
MIC/LINE Input level
LINE -56.0 dBm
MIC 2 -56.0 dBm
MIC 1 -50.0 dBm
5-4 Noise Level
When no sound is produced, confirm that each residual output noise is as follows:
PHONES (L, R): less than -75 dBm
AUX OUT (L/L+R, R): less than -65 dBm
LOOP SEND (L, R): less than -65 dBm
INDIV. OUT (1, 2): less than -60 dBm

POWER ON RESET

While pressing the [Demo] button, all RAMs will be initialized and be returned to factory setting.
It is recommended that important data, etc. be stored on floppy disks.
40
Connect the PC keyboard.
Check that the LCD will displays "OK".
After reading in the system backup disk, check the version for each data in flash memory.
All RAMs are initialized and reset to factory setting data when this test is executed.
The test program is exited when this test is executed.
+0.4 dBm +/-3 dB
less than -65 dB
Output level SIGNAL LED
-10.0 dBm +/-3 dB
-0.4 dBm +/-3 dB
+12.8 dBm +/-3 dB
Output level SIGNAL LED
-14.7 dBm +/-3 dB
-4.8 dBm +/-3 dB
+10.7 dBm +/-3 dB
OVER LED
OFF OFF
ON OFF
ON ON
OVER LED
OFF OFF
ON OFF
ON ON