Teac GF-600 Service Manual page 9

3-4-2 PLAYBACK PERFORMANCE
ITEM TEST TAPE
MTT-25702
1.Head azimuth
adjustment
MTT-25702
2.Playback
MTT-150C
output level
3.Playback
MTT-25702
frequency
response
4.Playback S/N
MTT-5513
ratio
GF-600
(in phase)ter
PHONES
Fig.3-7 Test setup for azimuth check
3-4-3 Recording performance
ITEM TEST TAPE
1.Bias osc
MTT-5513
frequency
MTT-5513
2.Total
harmonic
MTT-5563
distortion
3.Overall
MTT-5513
frequency
response
MTT-5563
4.Overall
MTT-5513
S/N Ratio
PLAYBACK
ADJUSTMENTS
FREQUENCY
8KHz Azimuth screw
250Hz
Dolby B type
tone
8KHz
Playback the
leader tape
portion
Oscilloscope
AC voltmeter
HOR
VER
S1
INPUT SIGNAL
ADJUSTMENTS
(AUX in)
400Hz/-6dB
8KHz/-28dB
NO signal
MEASURING
POINTS,RESULT
Maximum output
level at L/R-ch
Phase:within 45°
Check
(Fig.3-8)
Check -4 ±3dB
Check
±5dB
Check 40dB min
0°
45°
(in phase)
Fig.3-8 Confirming phase relationship
MEASURING
POINTS,RESULT
85KHz
Check
Check 3.0% or less
Check +3 to 4dB
Check
±7dB
Check 35dB min
REMARKS
Fig.3-7
Reference output
level
Reference
level:250KHz
Ratio of reference
level to noise
180°
90° 135°
(out of phase)
REMARKS
Reference level:
250Hz
Ratio of reference
level to noise
GF-600
9