OTARI MX-5050 BIII-2 - Record Level Adjustment; Record Equalization Adjustment

7.4.3 Record Level Adjustment
1. Thread the machine with tape and set the SPEED Select Switches for the
Tape Speed most often used.
2. Set both RECORD READY buttons to the READY position.
3. Set both Monitor button to TAPE position.
4. Press the 1 kHz Test Oscillator button on the Amplifier Panel. Adjust the Input
Control knob so that the VU meters indicate 0 VU. (Input a signal level of -10
VU for 7.5 ips.)
5. Press the PLAY and RECORD buttons to begin recording.
6. Adjust VR305 on the REC/REP PCB Assembly so that the CH 1 VU meter
indicates 0 VU (-10 VU if adjusting at 7.5 ips).
7. Check to see that there is no difference in the indication on the VU meters
when switching between SOURCE and TAPE modes.
8. Repeat Steps 4 and 7 for Channel 2 by adjusting VR405.
7.4.4 Record Equalization Adjustment
NOTE: These adjustments should be performed after the Playback Equalization and
Record Bias adjustments are completed.
1. Thread the machine with tape and set the SPEED select switch to the HI
position, (15 ips for High Speed, 7.5 ips for Low Speed).
2. Press the 10 kHz Oscillator Frequency button to activate the Test Oscillator.
3. For High Speed models (HI; 15 ips), adjust the Input Level knob until the VU
meter indicates 0 VU. For Low Speed models(HI; 7.5 ips), adjust the Input
Level knob until the VU meter indicates -10 VU.
4. Set the Monitor button to TAPE position. Set both RECORD READY buttons
to the Ready position, and press the PLAY and RECORD buttons to begin
recording.
5. Adjust VR303 (REC EQ H) on the REC/REP PCB Assembly until the VU meter
indicates 0 VU (-10 VU for Low Speed).
6. Repeat Step 5 for Channel 2 using VR403.
7. After setting the SPEED select switch to the Lo position, repeat Steps 3
through 6 using the REC EQ L trimmer (VR304 for CH1, VR404 for CH2). For
High Speed models, adjust the trimmers until the VU meter indicates -10 VU
at steps 3 and 5. For Low Speed models, adjust the trimmers until VU meter
indicates -20 VU at steps 3 and steps 5.
MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual
1999-02 51