Yamaha Audiogram 3 Service Manual page 12

AUDIOGRAM3
INSPECTIONS
1. Measurement condition
1-1 Environment
Temperature (5˚C – 40˚C)
Humidity (30% – 90%)
1-2 Power supply
Power is supplied from a personal computer. (Powered through USB bus)
2. Electric characteristics
2-0 0 dBu = 0.775 Vrms
2-1 Preparation
Load resistor of each output terminal is as follows:
PHONES (L, R) : 40 Ω (3 W or more)
Others : 10k Ω
2-2 Unless otherwise specifi ed, the operation elements shall be set as follows,
• INPUT1
LEVEL control (GAIN control)
MIC/INST switch
• INPUT2
LEVEL control (GAIN control)
• OUTPUT
LEVEL control (MASTER level control) : Maximum
• Others
PHANTOM switch
2-3 Use 1 kHz sine wave for input signal unless otherwise specifi ed.
2-4 Signal source impedance should be 150 Ω.
2-5 Power indicator
Check that the POWER LED lights when the personal computer is connected.
12
: Maximum
: OFF (MIC)
: Maximum
PHANTOM switch
: OFF
INPUT1 INPUT2 OUTPUT
Level control Level control
(GAIN control) (GAIN control)
MIC/INST switch
Level control
(MASTER Level control)