Marantz SD9000 - Page 36

10. 19 kHz Filter Adjustment
SETUP
. Power voltage:— 50 Hz/60 Hz AC voltage rated for
the unit to be used in a market country.
aes] . Input terminal:— 19 kHz, —60 dB.
‘| . Tape selector switch: - NORMAL.
: Output terminal:— Line out.
. Load:— Measuring instrument input impedance.
PROCEDURES
1. Connect the 19 kHz, —60 dB input signal to the
Mic Input terminal. Adjust the level control for
OVU.
. in turn, MPX Filter switch to the ON position.
Adjust the L101 and L201 for minimum output
level at the Line Out.
. Proceed both for the right and left channels in the
same manner.
Mode: Record
AF OSC
TONE: 19 kHz,
11. Program Selection by Inter-program gaps —
Function Adjustments
SETUP
1. Tape speed selector switch: — NORMAL.
‘2. Tape selector:— Set to accommodate the music
tape used.
2. Tapes to be used:— Should have large level dif-
ferences’ between programs and_ inter-program
gaps, and have around 4 second gaps between
programs. Pre-recorded popular music tapes, for
instance, are adequate.
. Measurement terminals:— C510 negative side
Q501 collector
PROCEDURE
. Connect the Ch. 1 probe of a synchroscope to the
Q501 collector.
. Connect the Ch. 2 probe of the synchroscope to
the negative side of C510.
°3. Adjust R615 to provide a ratio of 1/3 or less
between the noise levels of recorded and non-
recorded portions of the tape.
Recorded portion Non-recorded portion
: Next, adjust R519 as follows:
Turn R519 to the extreme counterclockwise.
Slowly turning R519 clockwise, watch 0501's
collector waveform.
Stop turning where, between programs, 0501's
collector level becomes ‘‘Low’’.
Turn clockwise further by approximately 10°
beyond this position.
Between the programs
Pre-recorded Pre-recorded
part on the tape part on the tape
High Level
Q501 Output Low Level
Level
Select the Play-Pause mode.
At this time make sure that Q501’s collector
level becomes ‘’High”’ for 2 to 3 seconds.
Next release Pause, and make sure that the
collector level becomes ‘‘Low”’ in the recorded
portion.
i When i in the Cue mode:
Put the microcomputer in the Program Play-
back mode, such as Program Inputs 2 and 4,
for example.
Input 2 and 4 and push the Start button.
The unit will Rewind and run the tape in the
Cue mode for the first program.
Make sure that between the first and second
programs Q501’s_ collector level becomes
“High”.
If at this time the unit malfunctions, readjust
R519. (Readjust so as to tower the overall
level.)
*
NOTE: When R519 is readjusted, make sure per-
formance in the Play mode is natural.