Daewoo AMI-208MC Service Manual page 7

ADJUSTMENTS
Step Item
Normal
Tape Speed
1
Adjustment
High
2 Azimuth Adjustment
Recording Bias Oscilla-
3 tor Frequency Adjust-
ment
Test Tape : MTT-111N(3kHz)
MTT-5511(Blank)
Set
FIG. 1 : Tape Speed & Record Bias Oscillator
Frequency Adjust Circuit
L-CH
Peak
within
1 dB
R-CH
Peak
Screw
Angle
L-CH
Peak
FIG. 3 : Tape Azimuth Adjust Head Screw & Waveform
TAPE ALIGNMENT CHART
Reference Value Test Tape
3,015~3,025Hz MTT-111N
3,000~3,010Hz MTT-111N
5,820~6,180Hz MTT-111N
Maximum Level
MTT-114N
Phase:Within90°
±
MTT-5511
80 KHz 0.5
Frequency Counter
Output Level
Measurement Point
within
1 dB
Screw Angle
R-CH
Peak
Adjust Point Test Point
Line Out L/R
RV601
Channel
Line Out L/R
RV601
Channel
Shorted
- - - - - - TP601,
TP602
Line Out L/R
Head Screw
Channel
TP603,GND
L603
Adjust with Frequency
Counter Connected
Forward
Side
FIG. 2 : Tape Azimuth Adjust Location
(Record/Playback Head)
Test Tape
MTT-114N
(10kHz)
L-CH
Set
In Phase 45
Good
FIG. 4 : Tape Azimuth Adjust Circuit & Waveform
6
Note
Confirm Wow & Flut-
FIG.1
ter is within 0.35%
Confirm Tape Speed
of end position after
FIG.1
adjustment at tape
start position
Confirm High speed
after normal speed FIG.1
adjustment
FIG.2,3,4
Adjust with frequency
counter connected. FIG.1
Reverse
Side
Oscilloscope
V H
Output Level
Measurement Point
Screen Pattern
90 135 180
Wrong
FIG.