
3-2
WRR-855B
3-2. Adjustments
This section describes the following adjustment ( and
checks ) required to satisfy the specifications.
Adjustment Item
3-2-1. TUN-8 Board Adjustment
1. Front-end Adjustment
2. 1st Local Adjustment
3. IF Adjustment
4. Muting Level and RF Level Adjustment
5. FM Detector Adjustment
6. Output Level Adjustment
7. S/N Check
8. Noise Squelch Check
9. Tone Squelch Check
3-2-2. Overall Characteristic Confirmation
1. Current Consumption Check
2. S/N Check
3. Frequency Caracteristic Check
4. Distortion Ratio Check
5. RF Input Level Indication Check
6. AF Indicator Check
n
0 dB
µ
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
signal generator) for adjustment is expressed as an open
ended voltage in unit dB
µ
(where 0 dB
µ
= 1
µ
V). The
adjustment is to be carried out by calibrating the output
level of the signal generator as shown below.
Calibration Method
(1) Connect the RF milivoltmeter to the signal generator
as shown in the figure below.
(2) Adjust the level of the output signal from the signal
generator (SSG) so that the RF millivoltmeter reads 50
mV. The level of the output signal from the signal
generator (SSG) when the RF millivoltmeter reads 50
mV shall be specified as 100 dB
µ
(at no load).
V
OSC
50 mV
50
Z
50
Z
termination probe
Signal generator
(SSG)
50
Z
100 dB
µ
RF millivoltmeter
(set in 100 mV renge)
Adjust the output of
the signal generator
(SSG) so that the
meter reads 50 mV.
Содержание WRR-855B
Страница 1: ...UHF SYNTHESIZED TUNER UNIT WRR 855B SERVICE MANUAL 1st Edition Revised 2 ...
Страница 4: ...2 WRR 855B 8 Schematic Diagrams TUN 8 8 1 CPU 342 8 8 DP 236 8 10 SW 814 8 10 ...
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Страница 67: ...7 1 WRR 855B 7 1 Section 7 Board Layouts ...
Страница 68: ...7 2 WRR 855B 7 2 TUN 8 Suffix 11 TUN 8 Suffix 11 TUN 8 A SIDE SUFFIX 11 TUN 8 B SIDE SUFFIX 11 ...
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Страница 70: ...7 4 WRR 855B 7 4 CPU 342 Suffix 11 CPU 342 Suffix 11 CPU 342 A SIDE SUFFIX 11 CPU 342 B SIDE SUFFIX 11 ...
Страница 71: ...7 5 WRR 855B 7 5 CPU 342 Suffix 21 CPU 342 Suffix 21 CPU 342 A SIDE SUFFIX 21 CPU 342 B SIDE SUFFIX 21 ...
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Страница 84: ...Printed in Japan Sony Corporation 2006 6 16 2001 WRR 855B U CE E 9 976 898 03 ...