Sony WRR-801A Service Manual page 24

Step 3: Tuner [2] to [6] adjustment
When the TUNER UNIT WRU-801A is installed in the
Tuner [2] (Tuner unit 2) to Tuner [6] (Tuner unit 6) of the
WRR-801A, perform the adjustments from procedures (1)
to (5) of "Step 2. Tuner [1] (Tuner unit 1) adjustment" on
the respective tuner units that are installed in the WRR-
801A.
When performing the above described adjustments change
the following details as shown below of the "Step 2. Tuner
[1] (Tuner unit 1) adjustment."
Tuner [1] adjustment → Tuner [2], [3], [4], [5], or [6]
adjustment
Measurement:
TUNER OUTPUT 1 → TUNER OUTPUT 2, 3, 4, 5, or 6
Adjustment:
→ Tuner unit 2, 3, 4, 5, or 6
Tuner unit 1
Step 4:
After completing adjustment, turn off the WRR-801 A
power switch and perform the followings.
(1) Remove the tuner unit from the WRR-801A.
(2) Attach the upper side case lid to the tuner unit, and
insert the tuner unit to the slot of the WRR-801A.
3-6
3. Noise squelch adjustment
Equipment and Tools
. Signal generator
. Audio analyzer (level meter, distortion meter)
. Mic amp (Noise meter)
. Oscilloscope
. Adjuster(0.4 x 1.3 mm) : (Part No. 7-221-652-81)
. DC cut fixture (See the "How to make DC cut fixture"
on page 3-1.)
Preparation
Before the adjustments, turn off the POWER switch of the
WRR-801A, and perform the followings.
1. Remove the case cover of the WRR-801A.
2. Remove the tuner unit from the WRR-801A.
3. Remove the upper and lower side case lids of the tuner
unit.
4. Solder a wire ( 80 mm long) to the TP201(NOISE)
terminal(land) , and take out the free side of the
wire(80 mm long) to the upper side of the tuner unit as
shown below.
TP201(NOISE)
terminal(land)
Solder
Lead wire
(80 mm long)
Tuner unit
(Lower side)
5. Attach the lower side case lid to the tuner unit, and
insert the tuner unit to the slot of the WRR-801A.
Connection
Same as " 2. Output level adjustment ".
Switch and Control Setting
Front panel (Tuner [1])
Channel setting: Group 00, 69-01 channel
(800.125 MHz)
Muting: OFF
Rear panel
ATT(ANTENNA A, B) switch: 0 dB
Lead wire
Tuner unit
(Upper side)
WRR-801A
WRU-801A