Alignment Procedure - NAD C 740 Service Manual

ALIGNMENT PROCEDURE
1. FM Adjustment 4
а. Set the unit's frequency to 99.0MHz.
b. Connect a dc volt meter with P141.
c. Set FM MUTE/MODE SW (S717) to stereo.
£. Repeat above items(e & f) a few times.
h. Connect a Frequency counter with P161. |
j. Set the output of SSG to stereo.
К. Turn IFT in the frontend(U101) within +180 degrees so that stereo distortion can be minimum.
|. Adjust R165 and get maximum stereo separation.
m. Set SSG output to 17dBuV.
n. Adjust R153 so that STEREO indicator turns ON. As a optional method, judging by wave form is admitted.
o. Repeat above items(m and n) a few times.
<AH> model
Tunin, Output
Digital DC
530kHz voltmeter
600kHz
AC
i
400Hz 30% mod.
1600kHz
voltmeter
IRF Block
і
1105
АС
400Hz 30% mod. |990КН2 voltmeter {L106
Reference Specification
FM tuned voltage 87.50MHz~ 108.00MHz
More than 1.2V~Less than 10V
AM tuned voltage 530КН2 ~ 1710kHz
Adjustment 5
Point Adjust for
1.3V Less than 9.0V
Tuning Output
Frequency |Indicator
522kHz
OSC coil on
1.3V+0.2V
603kHz
AC
RF coilon
|
2
603kHz
voltmeter
|RF Block
Maximum
AC
999kHz
voltmeter
|1106
Maximum
or 581kHz {voltmeter
L105
Reference Specification
FM tuned voltage 87.50MHz~ 108.00MHz
More than 1.2V ~ Less than 10V
AM tuned voltage 522kHz~ 1611kHz
1.3V — Less than 9.0V
2. AM Adjustment
1.3V+0.2V
Maximum
Maximum
Adjustment
Point
OSC coil on
«C, B, B1? models
[Step [AM SG output
3. POWER AMP ADJUSTMENT
Offset Voltage
a. After 4 ~ 6minutes with the power on, adjust R544 and R644 to OmV 3:20mV.
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