Equipment And Tools - Sony WRR-800A Service Manual

2. Output level adjustment
Perform this adjustment when the TUNER OUTPUT
levels deviate from the specification.
Preparation
Before the adjustments, turn off the POWER switch of the
WRR-800A, and perform the followings.
1. Remove the case cover of the WRR-800A.
2. Remove the tuner unit form the WRR-800A.
3. Remove the upper side case lid of the tuner unit, and
insert the tuner unit to the slot of the WRR-800A.

Equipment and Tools

. DC power supply: +9 Vdc
. Audio analyzer (level meter, distortion meter)
. Mic amp (Noise meter)
. Oscilloscope
. Adjuster (0.4 x 1.3 mm): (Part No. 7-221-652-81)
Connection/Adjustment Location
Oscilloscope
MIC amp
600 Z
balance
input
Audio analyzer
DC power supply
TUNER OUTPUT
DC IN 9 V
+9 Vdc
Signal
generator
ANTENNA
A IN
WRR-800A
Switch and Control Setting
Channel setting: Group 00, 6701 channel
VOL. control:
Muting:
Procedure
Step 1: Preparation
Set the signal generator as follows:
Signal generator setting
FREQUENCY (Carrier frequency): 799.250 MHz
RF OUTPUT (Output level): 60 dBuV
MODULATION (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation): ± 5 kHz
Step 2: Adjustment
(1) Connect the audio analyzer to the TUNER OUTPUT
connector via MIC amp.
(2) Connect the signal generator to the ANTENNA A IN
connector.
(3) Adjustment (ANTENNA A IN side adjustment)
Specification: Output level (level meter indication
Adjustment: 1RV202/RF board (Tuner unit)
RV202 RV201
(4) Connect the signal generator to the ANTENNA B IN
connector.
(5) Adjustment (ANTENNA B IN side adjustment)
Specification: Output level (level meter indication
Adjustment: 1RV201/RF board (Tuner unit)
n
Tuner unit
The output level difference between the ANTENNA A
side and the ANTENNA should be within 0.3 dB.
Step 3:
After completing adjustment, turn off the WRR-800 A
WRR-800A
power switch and perform the followings.
ANTENNA B IN (1) Remove the tuner unit from the WRR-800A.
(2) Attach the upper side case lid to the tuner unit, and
insert the tuner unit to the slot of the WRR-800A.
(799.250 MHz)
MAX
OFF
EMF
(= _53 dBm)
level) = _20 dBm ± 0.5 dB (at 600 Z
loaded)
level) = _20 dBm ± 0.5 dB (at 600 Z
loaded)
3-5