Marantz ST-40 - Service Program

7. SERVICE PROGRAM
1. T.R POINT ME (tracking point memory) mode.
From power OFF (backup mode), when the power
switch is pressed ON while pressing the FM or AM
(MW) band key simultaneously, the T.R POINT ME
mode is called.
106MHz
106MHz
9kHz without LW 603kKHz
9kHz with LW 603kHz
999kKHz | 1404kHz
999kHz | 1404kHz
10kHz 600kHz
Pio | P11 | P12~P30
2. Segment check mode
1) Inthe above situation, further press the FM or AM (MW)
band key simultaneously.
2) The muting signal is output and the service program is
started. During the execution of the service program,
muting remains ON.
3) The fluorescent display all goes out once, lighting is
performed from segments D1-a to D8-h sequentially
one after another at a rate of 0.3 second/segment. (A
segment once lit does not go out as it stands.)
When all the segments light, the segment check mode
is terminated with their lighting for 3 seconds as they
are. (The band and frequency engaged right before the
segment chec mode are restored.)
During the lighting for 3 seconds, when the MEMORY
key is pressed, all the segments continue lighting as
they are.
When the MEMORY key is pressed once again, all the
segments flicker for 3 seconds (at 1 Hz), with which the
segment check mode is then terminated.
EUROPE
USA
9kHz without LW
9kHz with LW
10kHz
Sear
Mz 2580 16
1000KHz | 1400kHz
—: Low end frequency of the
FM or AM (MW) band.
5) During the execution of the segment check mode, any
other key than the MEMORY key is not accepted.
6) In the state of 3), when the MEMORY key is pressed,
the state that all the segments light is entered. Namely,
by the pressure of the MEMORY key, it is possible to
skip over the process that all segments light one after
another in sequence.
* During the execution of the service program, when the
power is turned once OFF and then ON, the service
program is canceled.
8. TUNER ALIGNMENT PROCEDURES
Set to T.R point ME mode of the service program.
(P2) to (P6) in the Digital Readout Frequency Setting column shows preset numbers for the above mode.
Before
alignment,
connect
a
dummy
resistor
of
47
kohms
to
the
tuner
output
terminal.
8-1. FM Alignment Procedures
(Function switch at “FM” position and MODE switch at “MONO” position )
@ FM RF Alignment
Digital!
Signal . : Readout Adiust
Step | Signal Source Connection Frequency indicator Connection Frequency j
Setting
FM signal generator to FM AC VTVM to L- or R- Front end IFT for maximum output
antenna terminal. Adjust channel output (J302) and minimum distortion.
1 the RF signal output so that 98.0 MHz 98.0 MHz
slight noise occurs at the po
upper and lower sides of (P2)
the output waveform.
FM signal generator 500 pV Distortion meter to L- or R- L201 core for minimum distortion.
output to FM antenna channel output (J302)
ej teuminel tenis 98.0 MHz 98.0 MHz
(P2)
@ FM MPX VCO Alignment
R314 for 228 kHz on the
frequency counter
FM signal generator 500 pV
output to FM antenna
terminal (74-ohm).
(Signal is no modulation)
Frequency counter between
1 and 2 of J301
(J301)
98.0 MHz
(P2)
98.0 MHz
@ FM IF Alignment
(Function switch at “FM” position and MODE switch at “AUTO STEREO” position)
Digital
Signal Readout Adjust
Frequency Indicator Connection Frequency ju
Setting
VTVM to L-channel output
(J302 L-channel)
Stereo
L-channel
(1.000 Hz)
FM signal generator 500 pV
output modulated by MPX
signal generator to FM
antenna terminal (75-ohm).
Modulation level:
IHF 67.5 kHz +9 % pilot dev.
DIN 40 kHz +8 % pilot dev.
98.0 MHz
(P2)
Front end IFT for minimum
distortion.
VTVM to R-channel output
(J302 R-channel)
Stereo
R-channel
(1,000 Hz)
©@ Muting Level Alignment
(Function switch at “FM” position and MODE switch at “AUTO STEREO” position)
Digital
Signal Indicator Connection Readout
Frequency Frequency
Setting
AC VTVM to L- or R- R211 to a point at which output
FM signal generator 6.3 uV
output to FM antenna 98.0 MHz channel output (J302) 98.0 MHz appears.
terminal
(75-ohm)
(P2)
17
MZ 2581