Adjustments - Daewoo AMI-V225M Service Manual

Adjustments

TAPE SECTION
Input Level
Measurement
Point
Test Tape be used
Tape
MTT-111N
MTT-114N
MTT-5511
HEAD ADJUSTMENT (AZIMUTH)
1. 10KHz test tape(example: MTT-114N) must be used for this adjustment.
2. Connect to VTVM or oscilloscope to the headphone jack or speaker terminal.
3. Press the play button.
4. Adjust the azimuth by using a screw driver to maintain the max. L&R output voltage.
5. Adjust tape A(1), tape B(2) respectively, Please secure the azimuth position by using locking paint.
RECORDING BIAS OSCILLATOR FREQUENCY ADJUSTMENT
1. Connect the frequency counter to TP603, GND.
2. Press the REC button.
3. Adjust L603 to obtain 80 KHz
Step Item
Tape Speed
Normal
Adjustment
1
2
Azimuth Adjustment
Recording Bias Oscilla-
tor Frequency Adjust-
3
ment
Test Tape : MTT-111N(3kHz)
MTT-5511(Blank)
Set
FIG. 1 : Tape Speed & Record Bias Oscillator
Frequency Adjust Circuit
L-CH
Peak
R-CH
Peak
Screw
Angle
FIG. 3 : Tape Azimuth Adjust Head Screw & Waveform
Output Level
Measurement
Point
R-CH
L-CH
±
100Hz
TAPE ALIGNMENT CHART
Reference Value
3,015~3,025Hz
3,000~3,010Hz
Maximum Level
Phase:Within90°
±
80 KHz 0.5
Frequency Counter
Output Level
Measurement Point
within
1 dB
within
1 dB
L-CH R-CH
Screw Angle
Peak Peak
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Input Point
47 kohm
VTVM
47 kohm
Contents
3 KHz
10 KHz
Blank
Test Tape Adjust Point
MTT-111N RV601
MTT-111N RV601
MTT-114N Head Screw
MTT-5511 L603
FIG. 2 : Tape Azimuth Adjust Location
FIG. 4 : Tape Azimuth Adjust Circuit & Waveform
- 4 -
Scope
Use
Tape Speed Adjustment
Head Azimuth Adjustment
Record Frequency Property
Test Point Note
Line Out L/R Confirm Wow & Flut-
Channel ter is within 0.35%
Confirm Tape Speed
Line Out L/R of end position after
Channel adjustment at tape
start position
Line Out L/R
Channel
Adjust with frequency
TP603,GND
counter connected.
Adjust with Frequency
Counter Connected
Forward
Side
(Record/Playback Head)
p
MTT-114N
(10kHz)
Oscilloscope
L-CH
V
Set
Output Level
Measurement Point
Screen Pattern
In Phase 45 90 135 180
Good Wrong
FIG.
FIG.1
FIG.1
FIG.2,3,4
FIG.1
H