Sony UWP-V1, Service Manual

Page: 61 / 164

2-41
UWP Series
2-4-2. Adjustments
This section describes the following adjustments (and
checks) required to satisfy the specifications.
Adjustment Item
1. Current Consumption Check
↓
2. Reference Frequency Adjustment
↓
3. Output Level Adjustment
↓
4. RF Squelch Level/RF Indicator Level Adjustment
↓
5. Overall Characteristics Check
(1) Output Level Check
(2) S/N Check
(3) Frequency Characteristic Check
(4) Distortion Ratio Check
(5) RF Squelch Level/RF Indicator Check
(6) RF Level Indicator Check
(7) AF Level Indicator/AF Indicator Check
(8) Tone Squelch Check
(9) Monitor Level Check
n
0 dB u V
EMF
= _ 113 dBm
(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
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.
V
Signal generator
(SSG)
RF millivoltmeter
(set in 100 mV range)
50 Z
termination probe
Adjust the output of
the signal generator
(SSG) so that the
meter reads 50 mV.
50 mV 50 Z
50 Z
OSC
100 dB u
(Sq OFF)
LCD :
Calibration method
1. Connect the RF millivoltmeter 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 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 dB
u
V
EMF
(at no load).
Setting the Squelch OFF Mode
The squelch OFF mode can be set in the following procedure.
1. Turn off the power of the URX-P2.
2. While pressing and holding the “
_
” button of the
URX-P2, turn on the power of the URX-P2. (Keep
pressing the button.)
3. When the following message appears on the LCD,
remove your hands from the above buttons.
Model LCD message
U30 U30
U42
U42
CE62
CE62
CE67
CE67
KR HELLO
4. When the message “Sq OFF ” is displayed, the squelch
OFF mode is set.
m
.
When you turn off the power of the URX-P2, the equip-
ment returns to the normal mode (squelch ON mode).
. When the Squelch OFF mode is not set, if the RF
signal is not received for one minute or more, the
function that turns off the “Ant-b” side power supply
works, which may prevent correct adjustment.