Sony WRT-847A, Service Manual

Page: 7 / 54

1-3
WRT
-847A/847B
3
(GB)
Selectable RF output
The RF output power can be adjusted to high (50 mW) or
low (10 mW) to match the environment where it will be
used; to obtain a wide service area, set this to 50 mW, and
when using the transmitter in a simultaneous multi-channel
system, set it to 10 mW.
Highly reliable audio gain level adjustment
With an adjustable range of –12 dB to +9 dB in 3 dB steps,
the built-in input level volume reduces signal distortion
during the input of excessively strong audio signals. It can
raise the input gain during too low audio input.
POWER switch with holding function
The POWER switch can be locked in the ON position to
protect against accidental power cutoffs.
Powered by readily available battery type
The built-in, high-efficiency DC-DC converter provides
about eight hours of continuous and stable operation with
two LR6 (size-AA) alkaline batteries.
Low-battery notification on the unit and the tuner
When the transmitter batteries are low, the transmitter sends
a warning to the WRR-802A/805A/850A, MB-806A with
WRU-806A in the form of “Battery status information.”
This information is sent to the WRR-802A/805A/850A,
MB-806A with WRU-806A about one hour before the
batteries go dead to allow the batteries to be safely replaced.
When the WRR-802A/805A/850A, MB-806A with
WRU-806A receive this information, the LED and the
LCD
1) display on tuner panel start to flash.
LCD
1)
read-out of various information
The transmitter's LCD
1)
display shows the current channel
number, frequency, audio gain, compander time constant,
RF output settings and residual battery power.The
accumulated battery use time is also indicated (in one-
minute increments) to allow precise monitoring of battery
use.
Automatic saving of channel, audio gain and RF
output settings
All channel, audio gain, compander time constant, and RF
output settings are automatically saved when the transmitter
is turned off, thus eliminating the need to make the same
settings again the next time you use the transmitter.
Tone signal-incorporated RF carrier signal
The transmitter sends an RF carrier signal that incorporates
a tone signal to enable any tuner with a tone squelch circuit
to pick out only the target audio signal.
Notes on simultaneous multi-channel
operation
When operating two or more transmitters simultaneously in
a multi-channel system, please note the following.
• Set the RF output power of the transmitters to 10 mW.
• Keep the transmitters separated from each other by a
distance of at least 30 cm (1 foot).
• Keep the transmitters at least 3 meters (10 feet) away from
the receiving antenna.
1)LCD: Liquid-crystal display
.............................................................................................................................................................................................................................................................
4
(GB)
Parts Identification
1
Microphone capsule unit (not supplied)
Mount the microphone capsule unit (CU-F780, CU-G780,
CU-E700, CU-E672 or CU-F117) securely.
See the instruction manual supplied with your microphone
capsule unit for mounting.
2
Liquid-crystal display (LCD)
A
AF (audio input) indication
Lights whenever an audio signal stronger than the reference
level is received.
B
RF (antenna output) indication
Lights during signal transmission from the antenna.
C Power (RF power) indication
Shows the RF power setting.
See “Changing the RF Output Power” on page 12.
A B D C
E
AF RF BATT
1
In the figure, the CU-F780 capsule unit (not supplied)
is mounted on the WRT-847A/847B as an example.
2
3
4
5
6
7
Channel indication
E
shows
that of the CE62 model as
an example.
5
(GB)
D
BATT (battery) indication
Shows the battery condition.
See “Battery indication” on page 7.
E
CH (channel) indication
Displays the transmitting channel.
Each time you press the SET button in Transmitting mode,
the channel indication changes as follows.
Display of the transmitting channel/frequency
shows that of the CE62 model as an example.
Transmitting
channel
Transmitting
frequency
Audio gain level
Accumulated
battery use time
Press SET
button.
Transmitting channel: The current transmitting channel
setting.
Transmitting frequency: The current transmitting
frequency setting.
Audio gain level: The input gain level setting in decibels.
Can be set within a range of –12 dB to +9 dB in 3-dB
steps.
Accumulated battery use time: The accumulated time of
battery use (in 1-minute increments).
Compander time constant: “ L” means the long time.
“ S” means the short time.
To adjust these parameters, see “Settings” from page 8 to
12.
3
SET button
In Transmit mode, press this button to change the indicated
items in the lower half of the LCD display.
To change the settings on each item, set the transmitter in
the Setting mode as follows: Turn the POWER switch to
ON while holding the SET button down. Then press the
SET button to select the items to be changed, and press the
+/– buttons to change the settings.
For details on Setting mode, see “Settings” on page 8.
Compander time
constant
6
(GB)
Parts Identification
4
POWER switch
Turns the transmitter ON or OFF.
When you set this switch to ON without holding down the
SET button, the transmitter enters Transmitting mode, and
the signal of the selected channel is transmitted.
The HOLD switch appears when the POWER switch is set
to ON.
Set the HOLD switch to the lock position to prevent an
accidental power cutoff during microphone operation.
Locking the POWER switch
5
Antenna
Slide the HOLD switch to the
right with a ballpoint pen or
similar item. A yellow line appears when
the switch is in the hold
position.
6
Battery holder
Insert the batteries here.
For details on inserting the batteries, see “Power Supply”
on page 7.
7
+ (+ selection) / – (– selection/reset) buttons
In Setting mode, use these buttons to select the transmitting
channel/frequency, audio gain level, compander time
constant, and RF power level.
Use the – button to reset the accumulated battery use time
indication to 00:00.
For details on Setting mode, see “Settings” from page 8 to
12.
How to press the SET and +/– buttons
ON
HOLD
ON
HOLD
Green line Yellow line
+
SET
–
To pess the SET, +/– buttons
use a ballpoint pen or similar
item.