Reference Frequency (4 Mhz Oscillation Frequency); Adjustment; Output Level Adjustment - Sony WRR-862A Service Manual

3-2-2. Reference Frequency (4 MHz
oscillation frequency) Adjustment
Equipment and Tools Required
DC power supply : +12.0 Vdc ± 0.1 V
Frequency counter
Adjuster (Part No. 7-221-652-81)
Connector 4P (Part No. 1-566-425-11)
Connection/Adjustment Location
When adjustment is performed, remove the case (upper)
from the WRR-862A/862B unit.
Frequency
counter
DC power
supply DC ammeter
+ _
+
_
+12.0 ± 0.1V
+
_
Pin No.4
To DC
(+)
POWER
Pin No.1
(_)
SUPPLY
Switch and Control Setting
Same as "1. Switch and Control Initial Setting" on page 3-2.
Procedure
(1) Connect the frequency counter to the CL1351 on the
AU-276/285 board (B side).

(2) Adjustment

Specification : Frequency at CL1351/AU-276 board
(B side) = 4.000 MHz ± 60 Hz
Adjustment : 1 CT1401/AU-276/285 board (B side)
3-4
AU-276 board (B side)
1
1
CL1351
CT1401
4P connector
4 1
3 2
Bottom View

3-2-3. Output Level Adjustment

Perform this adjustment when the OUTPUT connector
levels deviate from the specification.
Equipment and Tools
DC power supply: +12.0 Vdc ± 0.1 V
Audio analyzer (level meter, distortion meter)
Mic amp (Noise meter)
Oscilloscope
AF Output cable (supplied with WRR-862A/862B)
Adjuster (0.4 x 1.3 mm) : (Part No. 7-221-652-81)
Connector 4P (Part No. 1-566-425-11)
Preparation
(1) Remove the case (upper) and the partition.
(For removal, refer to the Section 2.)
(2) Connect the two flat wires of the RX-60/74 board to the
CN1701 and CN1801 connectors on the AU-276/285
board. The AU-276/285 and RX-60/74 boards must be
connected electrically as shown below.
CN1701
Connection/Adjustment Location
Signal
generator
ANT a
Function
generator
DC power supply DC ammeter
+ _ RV611
+
_
RV601
+12.0 ± 0.1V
+
_
4P connector
Pin No.4
To DC
(+)
POWER
Pin No.1
Bottom View
(_)
SUPPLY
AU-276/285 board
CN1801
Frat wire
RX-60/74 board
Mic amp
AF output cable
OUTPUT1
OUTPUT2
Audio
analyzer
ANT b
(with A-weighted filter)
1
1
Oscilloscope
1 1 1 1
RV711
RV701
4 1
3 2
WRR-862A/862B