Adjustments - Sony WRU-806B Service Manual

2-2. Adjustments

This section describes the following adjustments (and
checks) required to satisfy the specifications.
Adjustment Item
2-2-1. Muting Level and RF Level Adjustment
2-2-2. Output Level Adjustment
2-2-3. Overall Characteristic Check
1. Output Level Check
2. S/N Check
3. Frequency Characteristic Check
4. Distortion Ratio Check
5. RF Level Indicator Check
6. AF Level Indicator/AF Indicator Check
7. Muting Level/RF Indicator Check
8. BATT Indicator Check
9. Tone Squelch Check
10. DC +9 V OUT Voltage Check
n
= _113 dBm
0 dBuV
EMF
(EMF = Electromotive force)
0 dBm = 1 mW at 50 Z loaded
Note on Adjustment
The RF level of the input signal (the output level of the sig-
nal generator) for adjustment is expressed as an open ended
(0 dBu = 1 uV
voltage in unit dBuV
EMF
The adjustment is to be performed by calibrating the output
level of the signal generator as shown below.
2-2
Calibration method
(1) Connect the RF millivoltmeter to the signal generator as
(2) Adjust the level of the output signal from the signal gen-
).
EMF
shown in the figure below.
erator (SSG) so that the RF millivoltmeter reads 50 mV.
The level of the output signal from the signal generator
(SSG) when RF millivoltmeter reads 50 mV shall be
specified as 100 dBuV
EMF
50 Z
termination probe
RF millivoltmeter
(set in 100 mV range)
Signal generator
(SSG)
100 dBu
50 Z
OSC 50 Z V
(at no load).
Adjust the output of
the signal generator
(SSG) so that the
meter reads 50 mV.
50 mV
WRU-806B