Yamaha Magicstomp UB99 - Inspections and Factory Set; Preparation; Measurement Conditions; Method of Inspection

14
UB99
1. Preparation
1) Measuring instrument: Oscillator
Distortion meter
Level meter
2) Jig: USB cable, P.C (Personal computer)
3) Connections of terminals are shown as follows:
INPUT Monaural Input 1/4 inch Plug (Signal Input)
OUT L/
MONO
Monaural Output 1/4 inch Plug (RL 47KΩ)
OUT R
Monaural Output 1/4 inch Plug (RL 47Ω)
AC IN AC ADAPTOR (AC-10)
USB USB Cable / P. C .
INPUT
LEVEL
HIGH(+10dB) / LOW(0dB)
2. Measurement Conditions
Unless otherwise specified, input signals are of
sinusoidal waves and the frequency is 1 kHz.
Before turning on power, set knobs of Control VR1,
Control VR2 and Control VR3 at positions near their
respective Centers.
Set Output VR to MAX and Input Level SW to Low.
Make sure that the input impedance of the measuring
instrument is 1 MΩ or greater.
Install USB-MIDI driver on the P.C.
3. Method of Inspection
3-1. How to get TEST MODE
When turning on power while pushing [Å|] SW and [Å{]
SW, you will get TEST MODE.
Proceed with inspection according to the instruction in
the following display.
Make sure that the back light SED of LCD is lit.
INSPECTIONS / FACTORY SET
UB99 P.CHEK V1.0
PUSH [ON/OFF] SW
3-1-1. DSP & DRAM & AD/DA Check
Push [ON/OFF] SW. The following display appears.
Make sure that a signal wave is outputted.
3-1-2. Electrical characteristics
U B99 DSP&DRAM
PUSH [ON/OFF] SW
Item Input terminal, Conditions Output terminal, Specifications
1: Input INPUT OUT L/MONO
sensitivity -4.5dBm(1KHz) 0dBm ±3dB
2: ditto INPUT OUT L/MONO
-4.5dBm(10KHz) 0dBm ±3dB
3: ditto INPUT OUT L/MONO
-4.5dBm(100Hz) 0dBm ±3dB
4: ditto INPUT OUT R
-22.5dBm(100Hz) 0dBm ±3dB
5: ditto INPUT OUT R
-22.5dBm(10KHz) 0dBm ±3dB
6: ditto INPUT OUT R
-22.5dBm(1KHz) 0dBm ±3dB
7: ditto INPUT OUT R
-33dBm(1KHz) 0dBm ±3dB
INPUT LEVEL HIGH
8: ditto INPUT OUT L / MONO
-15dBm(1KHz) 0dBm ±3dB
INPUT LEVEL HIGH
LOW after completion
9: NOISE INPUT OUT L / MONO
LEVEL Pull Out Plug -44 dBm or less
10: ditto INPUT OUT R
-44 dBm or less
11:
Distortion INPUT OUT R
factor -12dBm(1KHz) 0.5% or less
Push Insert Plug
12: ditto INPUT OUT L / MONO
+6dBm(1KHz) 0.5% or less