ELECTRICAL ADJUSTMENT-2/9 (LH, C MODEL)
DECK ADJUSTMENT 1. TAPE SPEED ADJUSTMENT
Requirements � Measuring equipments : wow-flutter meter (frequency counter ) Test Tape : TTA-100 (3KHz) Test point : HP OUT Adjustment point : Tape speed adjustment point (motor) 1) Connect HP OUT to the Wow - flutter meter. 2) Insert the test tape (TTA-100), play back center of the tape and adjust the motor until it becomes 3,000Hz±30Hz.
WOW&FLUTTER METER Hz INPUT HP OUT %
2. WOW - FLUTTER CHECK
Requirements Test tape : TTA-100 (3KHz) Test point : HP OUT 1) Connect the HP OUT to the Wow - flutter meter. 2) Set the indicator to JIS and the mode to W RMS (WTD) of the Wow - flitter meter. 3) Play back thee center of the test tape (TTA-100) and check that it is below 0.35%.
HP OUT WOW&FLUTTER METER Hz INPUT %
3. HEAD AZIMUTH ADJUSTMENT
Requirements � Measuring equipment : Oscilloscope Test Tape : TTA-330 (8KHz) Test point : HP OUT Adjustment point : Head azimuth screw
Lch OSCILLOSCOPE
OUTPUT CH1 CH2
1) Connect the HP OUT to the oscilloscope of CH1 and CH2. 2) Set the V mode of the oscilloscope to ADD. 3) Insert the test tape (TTA-330) , play back the center of the tape and adjustment the head azimuth screw until the waveform of the oscilloscope has reached the maximum when playing back at 10KHz. 4) After the adjustment, bond lock (1600B) the screw.
Rch
4. REC. BIAS FREQUENCY ADJUSTMENT
Requirement � Measuring equipment : frequency counter Test point : TP9 1) Connect the TP9 to the frequency counter. 2) Set the recording condition to the main unit. 3) Adjust the L301 until it becomes 85KHz±5KHz.
TP9 GND FREQUENCY COUNTER Hz
