Marantz MR230 - Alignment Procedures

3. ALIGNMENT PROCEDURES
* A dummy resistor of 47 kohms must be connected across the tape output terminals before alignment.
3.1 FM ALIGNMENT PROCEDURES
(Selector switch in the ‘“FM” position)
Signal Source
Connection
Sweep generator to
point (B) through
5pF capacitor
RF generator to
FM antenna
terminals (@) through
matching network
(300 ohms, balanced}
Maintain RF level
below limit.)
Signal Indicator Set Dial
Frequency Connection Pointer to:
FM IF ALIGNMENT
Oscilloscope to L104 for maximum and
10.7 MHz : 2:
ont © symmetric response.
market at e Quiet point on x F:
10.6, 10.7 and band.
10.8 MHz L201 for straight and
i t 4 aa of
te a ° symmetric “S” curve
P response,
Repeat steps 1 and 2.
FM RF ALIGNMENT
87.4 MHz with L103 for maximum
tuning gang closed. output.
109 MHz with C119 for maximum
VTVMtoLorR tuning gang open. output.
channel output
(W002) L101, L102 for
90 MHz maximum output.
100 MHz
Ant. RF trimmer for
106
MHz
106
MHz
maximum
output.
Repeat steps 1 to 4.
Check overall response curve and repeat above steps as necessary to obtain maximum sensitivity.
No connection
RF generator 1 mV
output to FM antenna
terminals (A) through
matching network
(300 ohms, balanced)
RF generator 12.5uV
output to FM antenna
terminals (A) through
matching network
(300 ohms, balanced)
L201 primary core
No signal DC VTVM {bottom) for ‘‘0’’ voltage
1-voit range to ©) ‘
| reading.
L201 secondary core
(upper) for minimum
distortion.
Distortion meter to
R232 so that signal
strength meter M00 1
may read 85%.
MUTING CIRCUIT ALIGNMENT
R233 for 12.5uV
VTVMtoRorL threshold level. (During
channel output 98 MHz the adjustment turn
(W002) the muting pushswitch
“ON”),