Sony WRT-847A, Руководство по обслуживанию

Страница: 19 / 54

3-3 WRT-847A/847B
3-2-1. Power Supply Voltage Check
Equipment and Tools Required
DC power supply
DC output voltage: + 3.0
±
0.1 V dc
DC ammeter
DC volt meter (or Digital multimeter)
Adjuster (Parts No. 7-721-052-81)
Switch and Control Setting
Perform the same setting as described in “4. Switch and Con-
trol Setting during Adjustment and Checking,” on page 3-3.
Procedure
(1) Set the POWER switch (S301) on the MB-914 board to
ON.
(2) Check the DC Voltage of the CL307 check land to the
specified voltage as below:
Specification: DC Voltage at CL307
= + 5.8
±
0.1 V dc
(3) Check the DC Voltage of the CL308 check land the
specified voltage as below:
Specification: DC Voltage at CL308
= + 3.3
±
0.1 V dc
1
1
1
1
1
GND
RV301
RV304
RV303
S201 (+)
CT201
CN402
S202 (–)
S203 (SET)
ON
DP-341 board
MB-914 board (B side) MB-914 board (A side)
RF-96 board
RV401
1
CT401
1
RV402
VCC
S301
(POWER)
4. Switch and Control Setting during Adjustment and
Checking
The following setting is to be perform with the SET
switch (S203), “ + ” switch (S201) and “ _ ” switch (S202).
Transmitting Channel setting:
U14 model; 16-01 channel (482.125 MHz)
U30 model; 32-01 channel (578.125 MHz)
U62 model; 64-01 channel (770.125 MHz)
U66 model; 68-01 channel (794.125 MHz)
CE21 model; 22-32 channel (482.000 MHz)
CE33 model; 34-32 channel (578.000 MHz)
CE62 model; 63-32 channel (810.000 MHz)
CE67 model; 68-32 channel (850.000 MHz)
AU66 model; 67-01 channel (799.250 MHz)
Attenuation setting: 0 dB
Accumulated time setting: “00:00”
Adjustment Location