Notes On Adjustment; Adjustment And Checking - Sony WRR-862A Service Manual

3-1-2. Notes on Adjustment

The RF level of the input signal (output level of the signal
generator) for adjustment is expressed as open ended
voltage in unit dBuV (0 dBuV
EMF
The adjustment is to be performed by calibrating the output
level of the signal generator as shown below.
Calibration method
(1) Connect the RF milli-voltmeter to the signal generator
as shown in the figure below.
(2) Adjust the level of the output signal from the signal gen-
erator (SSG) so that the RF milli-voltmeter reads 50
mV. The level of the output signal from the signal gen-
erator (SSG) when RF milli- voltmeter reads 50 mV
shall be specified as 100 dBuV
50-ohm
termination probe
Signal generator
(SSG)
100 dBuV
EMF
50 Z
OSC
3-2
= 1uV ).
EMF EMF
.
EMF
RF milivoltmeter
(set in 100 mV range)
Adjust the output of
the signal generator
(SSG) so that the
meter reards 50 mV.
50 Z 50 mV

3-2. Adjustment and Checking

This section describes the following adjustments (and
checking) required to satisfy the specifications.
Adjustment and Checking Item
3-2-1. Current Consumption Check
3-2-2. Reference Frequency (4 MHz oscillation frequency)
Adjustment
3-2-3. Output Level Adjustment
3-2-4. RF Squelch Level and RF Level Indicator Adjustment
3-2-5. S/N Checking
3-2-6. Distortion Ratio Check
3-2-7. Frequency Characteristics Check
3-2-8. RF Squelch Level Check
3-2-9. RF Level Indicator Check
3-2-10. AF Level Indicator/AF Indicator Check
3-2-11. Tone Squelch Check
3-2-12. TX BATT Transmitter (Battery) Indicator Check
n
= _113 dBm
0 dBuV
EMF
(EMF = Electromotive force)
0 dBm = 1 mW at 50 ohm loaded
1. Switch and Control Initial setting
MONITOR control (RV1211) : Minimum position
SQUELCH switch (S1602)
Channel setting (Tuner 1, 2) : Setting of the channel is to
CE21 model : Group 00, 2232 channel (482.000 MHz)
CE33 model : Group 00, 3432 channel (578.000 MHz)
CE62 model : Group 00, 6332 channel (810.000 MHz)
CE67 model : Group 00, 6932 channel (850.000 MHz)
U1416 model : Group 00, 1601 channel (482.125 MHz)
U3032 model : Group 00, 3201 channel (578.125 MHz)
U4244 model : Group 00, 4401 channel (650.125 MHz)
U6264 model : Group 00, 6401 channel (770.125 MHz)
U6668 model : Group 00, 6801 channel (794.125 MHz)
AU66 model : Group 00, 6701 channel (799.250 MHz)
: OFF
be perform with the CON-
TROL switch (S1601) the
MODE switch (S1603) ,
SET switch (S1606) , "+"
switch (S1604) and "_"
switch (S1605).
WRR-862A/862B