Akai QX-3700 Service Manual page 7

4. AMPLIFIER Section
i. AMPLIFIER Measurement Condition
(a) Power Output
(b) Source Impedance
(c) S/N
(d) Frequency Response
(e) Difference of L/R ch
(f) Other
ii. AMPLIFIER Specifications
Measurement Specifications
Description
Power Output 15±3W
Distortion Less than 2%
Line Input 200±50mV
Sensitivity
≥65dB
S/N
Channel more than 30dB
Separation
Frequency ±2dB
Response
Loudness +10dB±5dB
Line Out 80±20mV
Level
: Measure without pre-heating
: Normally 600
: Measure the noise level without low frequency (
: Measure at -10dBs output (1kHz) by adjusting oscillator output
: The output level difference between L ch and R ch at ± 3dB output
: In case of no comment, set volume maximum and 4
Measurement
Test Input
Point Selector
SP out Line
front
SP out Line
SP out Line
SP out Line
SP out Line
SP out Line
H:10KHz Line
L:100Hz
Line out Line
- 5 -
Condition/Method/Remarks
Input Signal Output
Freq. Level Level
1kHz Adjust Adjust
THD 2%
1kHz Adjust 12W
1kHz Adjust Adjust
THD 2%
4.7k 5W
Terminate
1kHz Adjust 5W
80Hz Adjust +3dBs
12.5kHz
1KHz Adjust ---
1KHz Adjust Adjust
THD 2%
80Hz) vibration
load
Measurement
Vol. Method/Remarks
MAX Both channel drive/
4 load
MAX Both channel drive/
4 load read best
value when indicator
of distortion meter is
changing
MAX
MAX
MAX Measure a ratio of
leak level of L
R L; Measured
channel input terminal
AUX: 4.7k Terminate
MAX Measure the level
difference
30Bar Difference from 1KHz
out
MAX
R,