OTARI MX-55T-M - 2.7 Audio Amplifier PCB Controls

Controls and Indicators
MX-55 Operation Manual
INPUT LEVEL trimmer {VR 1}
REC EO HI trimmer {VR 2}
REC EO LOW trimmer {VR 3}
REC LEVEL trimmer {VR 4}
REPRO LEVEL trimmer (VR 6)
SEL·REP LEVEL trimmer {VR 5}
REPRO EO HI SPD HF/LF trimmers
{VR 7/VRB}
REPRO EO LO SPD HF/LF trimmers
{VR 9/VR 10}
OUTPUT LEVEL trimmer {VR 12}
PEAK LED TRIGGER LEVEL trimmer {VR 11}
BIAS SYMMETRY trimmer (VR 13)
OVERBIAS trimmer {VR 14}
ERASE CURRENT trimmer {VR 15}
Bias Check points {CP 4/CP 7}
Erase Check points {CP 5/CP 6}
2.7 Controls on Audio Amplifier PCB
Assembly
This trimmer adjusts the level of the signal input to the Record electronics .
This tri mmer adjusts the High Speed record equalizat , ion.
This trimmer adjusts the Low Speed record equalization.
This trimmer adjusts the , level on tape of the signal being recorded.
This trimmer adjusts the level of the signal reproduced from the tape in Play mode.
This tr immer adjusts the level of the signal reproduced from the tape in SEL·REP mode .
These trimmers adjust the High and Low Frequency reproduce equalization,
respectively, at the High tape speed.
These trimmers adjust the High and Low Frequency reproduce equalization,
respectively, at the Low tape speed.
ThiS trimmer adjusts the level of the signal at the OUTPUT connector .
This trimmer adjusts the Trigger level for Peak level ind l cator .
This trimmer adjusts the Bias waveform symmetry.
This trimmer adjusts the level of the Record bias appHed to the tape during recording .
This trimmer adjusts the level of the Erase current applied to the Erase Head
during recording.
Those check paints are used to measure the Bias current. CP 4 is connected to
Ground and CP 7 is connected to the hot side.
Those check points are used to test for the presence of Erase Bias when replacing
the Erase Head.
2·22
March 1989