DAEWOO AXL125R
Manual de Servicio

Adjustments
1. TAPE SECTION
Output Level Measurement Point R-CH
Output Level

Input Point Scope 47 kohm VTVM

Input Level Measurement Point L-CH 47 kohm

Test Tape be used
Tape MTT-111N MTT-114N MTT-5511 Contents 3 KHz 10 KHz Blank Use Tape Speed Adjustment Head Azimuth Adjustment Record Frequency Property

1. 2. 3. 4. 5. 1. 2. 3.

HEAD ADJUSTMENT (AZIMUTH) 10KHz test tape(example: MTT-114N) must be used for this adjustment. Connect to VTVM or oscilloscope to the headphone jack or speaker terminal. Press the play button. Adjust the azimuth by using a screw driver to maintain the max. L&R output voltage. Adjust tape A(1), tape B(2) respectively, Please secure the azimuth position by using locking paint. RECORDING BIAS OSCILLATOR FREQUENCY ADJUSTMENT Connect the frequency counter to TP603, GND. Press the REC button. Adjust L603 to obtain 80 KHz±100Hz
Step Item TAPE ALIGNMENT CHART Reference Value Test Tape Adjust Point 3,015~3,025Hz Normal 1 Tape Speed Adjustment High 2 3 Azimuth Adjustment Recording Bias Oscillator Frequency Adjustment 3,000~3,010Hz MTT-111N RV601 MTT-111N RV601 Test Point Line Out L/R Channel Line Out L/R Channel Shorted TP601, TP602 Line Out L/R Channel TP603,GND Adjust with frequency counter connected. Note Confirm Wow & Flutter is within 0.35% Confirm Tape Speed of end position after adjustment at tape start position Confirm High speed after normal speed adjustment FIG. FIG.1 FIG.1

5,820~6,180Hz Maximum Level Phase:Within90° 80 KHz±0.5

MTT-111N MTT-114N MTT-5511

-----Head Screw L603

FIG.1 FIG.2,3,4 FIG.1

Test Tape : MTT-111N(3kHz) MTT-5511(Blank) Set

Frequency Counter

Adjust with Frequency Counter Connected

Output Level Measurement Point

Forward Side

Reverse Side

FIG. 1 : Tape Speed & Record Bias Oscillator Frequency Adjust Circuit
L-CH Peak within 1 dB R-CH Peak within 1 dB

FIG. 2 : Tape Azimuth Adjust Location (Record/Playback Head)
Test Tape MTT-114N (10kHz) L-CH Oscilloscope

Set

V

H

Screw Angle

Output Level Measurement Point Screen Pattern

L-CH Peak

R-CH Peak

Screw Angle

In Phase 45 Good

90

135

180

Wrong

FIG. 3 : Tape Azimuth Adjust Head Screw & Waveform
-4-

FIG. 4 : Tape Azimuth Adjust Circuit & Waveform