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