Marantz PMD351 N1B, Service Manual

Page: 10 / 48

8
4.4 MPX FILTER ADJUSTMENT
1) Put the unit in REC mode with a S.R.L. input.
2) The MPX fi lter switch ON and change the input
frequency to 19kHz(±10Hz).
3) Adjust L601(L), L602(R) for minimum output at the LINE
OUTPUT jacks.
CH ADJ. POINT ADJ. TO
L
R
L601
L602
Minimum
4.5 RECORDING BIAS FREQUENCY AND HX COIL
ADJUSTMENT
1) Put the unit in REC mode.
2) Adjust the following bias oscillator coil for 105kHz at the
bias frequency.
TEST POINT ADJ. POINT ADJ. TO
R901 LL01 105kHz
Remark:
May have to connect FREQUENCY COUNTER through an
AUDIO VOLT METER.
3) Next, connect the Oscilloscope to the HX test point
(T901, T902).
4) Adjust the HX coils for minimum level.
CH TEST POINT COIL ADJ. TO
L
R
T901
T902 L901
L902
Minimum
4.6 LEVEL METER SENSITIVITY CHECK
1) Put the unit in REC mode with a 1kHz, 100mV signal to
the LINE INPUT jacks.
2) Set the REC LEVEL at the test point T601, T602 as
300mV.
3) Check the VU LEVEL METER indicates 0dB.
Remark:
Dolby switch has to be OFF.
All manuals and user guides at all-guides.com