Sony WRR-862A, Service Manual, Page: 16 / 96

3-2
WRR-862A/862B
50
Z
50 Z 50 mV OSC
100 dB u V
EMF
Adjust the output of
the signal generator
(SSG) so that the
meter reards 50 mV.
50-ohm
termination probe
Signal generator
(SSG)
RF milivoltmeter
(set in 100 mV range)
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 dB
u
V
EMF
(0 dB
u
V
EMF
= 1
u
V
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 dB
u
V
EMF
.
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
0 dB
u
V
EMF
=
_
113 dBm
(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)
: OFF
Channel setting (Tuner 1, 2) : Setting of the channel is to
be perform with the CON-
TROL switch (S1601) the
MODE switch (S1603) ,
SET switch (S1606) , “
+
”
switch (S1604) and “
_
”
switch (S1605).
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)