RCA BR200D-U1, BR300D-U1 Service Manual

BR200D-U1/BR300D-U1 Service Manual

BR200D-U1

BR300D-U1

Service Manual

1

Contents

Chapter 1 General
Chapter 2 Radio Overview
Chapter 3 Mode Introduction
Chapter 4 Disassembly For Repair
Chapter 5 Circuit Description
Chapter 6 PCB Layout
Chapter 7 Adjustment
Chapter 8 Bill Of Materials
Chapter 9 Charger
Chapter 10 Block and Schematic

Appendix 1 Abbreviations
Appendix 2 Main Technical Indexes
Appendix 3 Trouble Shooting

BR200D-U1/BR300D-U1 Service Manual

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BR200D-U1/BR300D-U1 Service Manual

Chapter 1 General

1.1 Introduction

This manual applies to the service and maintenance of DR6000-2 and DR7000-2 radios,
and is for the engineers and professional technicians that have been trained by our
company. In this manual you can find all the information of product service. Our company
reserve the rights to modify the product construction and specification without notice in
order to enhance product performance and quality.
Read this manual before repairing the product.

1.2 Attention

Safety
Do not touch the antenna connector with your skin directly. .
Do not reverse the power polarities.
Do not turn on the radio before the antenna and load connection is completed.
Do not contact the damaged antenna when transmitting, or may make lightly burning on the
skin.

Electromagnetism Interference
It’s prohibited to use or repair the radio in the following places:
Hospital, health center, air port
Any area with a potentially explosive atmosphere (e.g. fuel and chemical storage and
transport devices etc.)
Any area of dynamite or exploder.

Change Components
All the components used in repair service should be supplied by our company.
Other components of the same models available on the market are not surely able to use in
this product and we do not guarantee the quality of the product using such components.

1.3 Service

All the our company products are subject to the service warranty.
After-sales service will be provided, and the length of warranty is stated by our company.
The radio and its accessories are all in the warranty. However, in one of the following cases,
charge free service will be not available.

No valid service warranty or original invoice.

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BR200D-U1/BR300D-U1 Service Manual

Malfunction caused by disassemble, repair or reconstruct the radio by the users without
permission.
Wear and tear or any man-made sabotage such as mechanical damage, burning or water
leaking.
Product serial number has been damage or the product trademark is difficult to identify.
Beyond the warranty time, lifetime service is still available with paid. And we also provide
service components to service stations and staff.

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a. DR6000-2

BR200D-U1/BR300D-U1 Service Manual

Chapter 2 Radio Overview

1. PTT ( PUSH-TO-TALK) Button
To make a call, press and hold the PTT button, then speak into the microphone in
normal voice. Release the PTT button to receive signals.

2. Side Button 1 (Programmable Button)

3. Side Button 2(Programmable Button)

4. Top Button (Programmable Button)

5. Channel Selector
Rotate to select channel 1~16.

6. Power/Volume Knob

Turn clockwise to switch on the radio.
Turn counterclockwise till a click is heard to switch off the radio.
Rotate to adjust the volume after turning on the radio.

7. LED Indicator

LED Indicates Status/Alert. Green LED lights when a carrier is detected in the current
channel. Red LED lights during transmission. Orange LED flashes when receiving the
Radio ID 5-Tone signaling or 2-Tone signaling or MDC signaling. Green LED flashes
when scanning. Red LED flashes when low battery.

8. Speaker/Microphone Jacks

Used to connect the optional speaker/microphone.

9. MIC Input

Please keep your mouth about 10 cm (3-4 inches) away from the microphone input
to achieve the best voice quality. If the distance is too far or too close to the radio, it

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BR200D-U1/BR300D-U1 Service Manual

will affect the voice quality.

Programmable Button Function

The dealer can program the Side Button 1, Side Button 2 and the Top Button with the
following Optional functions:
None (No Function)
Annunciation Selection
Talkaround
Call1/Call2/Call3/Call4
Lone Work
Emergency Call
Cancel Emergency Call
Man-Down
Scan
Noise Channel Delete
Call Forward
H/M/L Power Switch
Squelch Adjust
Monitor Momentary/Call Cancel
Monitor/Call Cancel
Squelch Off Momentary/Call Cancel
Squelch Off/Call Cancel
Lock Keyboard
Battery Check
FCS
Normal Record/Record Stop
Protected Record/Record Stop
Record play/Play Next/Play Stop
Record Delete
Surveillance
… …

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b. DR7000-2

BR200D-U1/BR300D-U1 Service Manual

10. PTT ( PUSH-TO-TALK) Button

To make a call, press and hold the PTT button, then speak into the microphone

in normal voice. Release the PTT button to receive signals.

11. Side Button 1 (Programmable Button)

12. Side Button 2(Programmable Button)

13. MIC Input

Please keep your mouth about 10 cm (3-4 inches) away from the microphone input
to achieve the best voice quality. If the distance is too far or too close to the radio, it
will affect the voice quality.

14. LCD

15. Key Pad

16. Top Button (Programmable Button)

17. Channel Selector

Rotate to select channel 1~512.

18. Power/Volume Knob

Turn clockwise to switch on the radio.
Turn counterclockwise till a click is heard to switch off the radio.
Rotate to adjust the volume after turning on the radio.

19. LED Indicator

LED Indicator Status/Alert. Green LED lights when a carrier is detected in the

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BR200D-U1/BR300D-U1 Service Manual

current channel. Red LED lights during transmission. Flashes orange when
receiving 5-Tone signaling or 2-Tone signaling . Green LED flashes when scanning

or Red LED flashes when low battery.

20. Speaker/Microphone Jacks

Used to connect the optional speaker/microphone.

Programmable Button Function

The dealer can program the Side Button 1, Side Button 2, Top Button and ‘C’, ‘<’, ’>’ ,’O’
Keys with the following Optional functions:
None (No Function)
Channel Up
Channel Down
Zone Up
Zone Down
Display CH Frequency
Display CH Alias
Display Mode Switch
OST
H/M/L Power Switch
Squelch Adjust
Lock Keyboard
Scan
Noise Channel Delete
Voice Expander
Scrambler
Home Channel
Talk Around
VOX
Monitor Momentary/Call Cancel
Monitor/Call Cancel
Squelch Off Momentary/Call Cancel
Squelch Off/Call Cancel
Emergency Call (Only for TOP key)
Cancel Emergency Call (Only for TOP key)
Radio Call
Call1/Call2/Call3/Call4
Menu Select/Enter (Only for ‘O’ key)
Lone Work
Scan List Edit
GPS Information Display
VOX Level
Back Light

8

GPS Auto TX
Zone0 Scan ADD/DEL
Man-Down
Normal Record/Record Stop
Protected Record/Record Stop
Record play/Play Next/Play Stop
Record Delete
Surveillance

… …

BR200D-U1/BR300D-U1 Service Manual

9

Chapter 3 Mode Introduction

Mode combinations

Mode Function How to access

Normal User

User

Mode

PC

Mode

Mode

Field

Programming

Mode
Data
Programming
Mode

Test Mode

Firmware
Upgrading
Mode

BR200D-U1/BR300D-U1 Service Manual

For normal use Power on

Programming the basic
information of the radio

Reading and writing
frequency data and other
functions
Used to tune the radio
using the PC.
Upgrades the software
when new features are
added

Menu or Programmable

Receive instructions from
the PC

Receive instructions from
the PC

Receive instructions from
the PC

Key

Normal User Mode：

You can enter Normal User Mode (conventional communication mode) by turning on the
power switch. Users in the mode can use the defined function of the radio.

Field Programming Mode：

You can enter the Field Programming Mode by pressing the “Menu” Key or a programmable
key to enter this mode.

Data programming mode:

Before leaving the factory, the radio has been set in factory. However, due to different
requirements of users, functional parameters of the radio such as working frequency,
channels, CTCSS/DCS and auto scanning, etc. should be set again. Therefore, the
company has specially designed a set of DR-6000 programming software with friendly
interface, convenient operation and visualized display for setting functional parameters of
the radio.
Steps for setting the functional parameters of the Radio by computer are as follows:

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BR200D-U1/BR300D-U1 Service Manual

1. Install DR-6000 programming software on the computer.

2. As shown in the figure below, connect the radio to the computer through a special serial
or USB programming cable.

Computer

(RS232 serial port

Programming

cable

(Earphone /Program port)

Radio

Figure 3-1

3. Turn on the power of the computer.

4. Turn on the power of the Radio.

5. Click on DR-6000 icon to perform the program.

6. In the main menu of the programming software, click on [Read] to read the parameters
of the radio into the computer; click on [Write] to write the parameters set in the
computer into the radio.

Caution:

1. Before editing for the first time, the data should be read from the Radio and properly
backed up.

2. If the edited data cannot work normally after being written into the Radio, please open
the backup data and rewrite them.

3. “Model Information” is the important information of the Radio and should not be altered.

Test Mode

According to Figure 3-1, connect the radio to the computer with the special programming
cable.

Warning: Before entering the Test Mode, please first connect a high-frequency load of 50

ohm to the antenna port of the radio or connect the radio a certain test instrument.

With the DR-6000 Programming Software, you can enter the adjustment status in
Computer Test Mode to adjust the following parameters of the radio:

（1） Frequency stability
（2） RF transmitting high power
（3） RF transmitting Middle power
（4） RF transmitting Low power
（5） Maximum TX voice deviation
（6） VOX1(Tight)
（7） VOX10
（8） 2/5 tone deviation
（9） DTMF deviation
（10） MSK deviation
（11） DCS/LTR balance
（12） DCS deviation

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BR200D-U1/BR300D-U1 Service Manual

（13） CTCSS(67.0Hz) deviation
（14） CTCSS(254.1Hz) deviation
（15） Battery warning level
（16） RX Sensitivity
（17） RX squelch 9 open level
（18） RX squelch 9 close level
（19） RX squelch 1 open level
（20） RX squelch 1 close level
（21） RSSI(-120dBm)
（22） RSSI(-70dBm)
（23） TX Low Voltage

Firmware Upgrading Mode

The radio is equipped with an internal FLASH ROM, it can be upgraded if required.

1. Connect the radio to the PC with a proper programming cable, then power on the radio.

2. Run computer programming software.

3. Select the right “com port” and suitable Baud Rate you connected and the upgrading

firmware and then click on “E.P” to start downloading.

4. Turn off the radio and exit the programming software.

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BR200D-U1/BR300D-U1 Service Manual

Chapter 4 Disassembly For Repair

The radio is a kind of sophisticated communication equipment with small and fine
mechanical structure. You should assemble and disassemble it carefully during the
maintenance process. The Instruction for assembly and disassembly are as follows:

Installing/Removing the Battery Pack

To install the battery, please place it into the groove on the top of the radio chassis about
5mm away from latch.
If the radio has the belt clip installed, you will have to press one side of the clip, to raise it
and slide the battery in proper position.
Press the battery with your fingers and push the battery until you hear a latch click, the
battery is now installed.

Removing the battery pack：

If you want to remove the battery from the radio, first press the battery latch located on the
bottom of the radio, and then press down to slide the battery about 5mm to release the
latch.

Notice:
* Do not short-circuit the battery terminals or dispose the battery in fire.

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BR200D-U1/BR300D-U1 Service Manual

* Do not disassemble the battery case.

Installing/Removing Antenna, Channel Selector, Power/Volume Knob

Screw the antenna out of the connector at the top of the radio by holding the bottom of the
antenna and turn it counter clockwise until apart.
Using a smooth tool or a tool protected with cloth to hold or prize up form the bottom of
channel selector or volume knob until apart.

Install external speaker/MIC

Open the cover of the jack for external speaker/MIC, and then insert the plug of the external
speaker or microphone into the jack on the radio. When inserting the accessory plug, make
sure it is properly aligned ( straight) to avoid internal damage to the connector in the radio.

Installing/Removing the Belt Clip

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BR200D-U1/BR300D-U1 Service Manual

Use the 2 screws (M2.5x8.0) supplied with the radio and fix these screws on the holes in
the radio clip and into the holes in the aluminum case. If you want to remove the clip from
the radio, just unscrew them, and remove the clip, you can put the screws back to make
sure you do not loose them.

Installing/Removing the Chassis, PCB

1． Remove the antenna, channel selector and power/volume knob.
2． Screw off the two screws at the bottom of the radio by a hexagon screwdriver.
3． Pry up the aluminum shell by peaking a straight screwdriver in the cross-slot at the

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BR200D-U1/BR300D-U1 Service Manual

bottom of the aluminum shell, and then pull out the surface shell after placing the
aluminum shell inclined to the back；but please be careful not to snap off the cable of the
speaker.

4． Screw off the 4 screws M2X3 on the keyboard PCB by a cross screwdriver and take out

the FPC from the socket ,then screw the 5 especially screws M2X3 from main PCB.

5． Screw off the 6 screws on the PCB by a cross screwdriver.
6． Unsolder the endpoints of the antenna , PTT key board and speaker by an electric iron,

then remove the main board.

After the disassembly above, you can carry out corresponding reparation and debugging
according to the actual malfunction.

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BR200D-U1/BR300D-U1 Service Manual

Exploded View of the Parts

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BR200D-U1/BR300D-U1 Service Manual

DR6000-2

No. Parts No. Description Qty.

1 301250607001X Machine screw M2.5X6.0 PB(+) black Ni-plate 2

2 2010CU600005X Radio top cover black 1

3 2030CU600003X SMA RF socket standard 1

4 301070500001X Encoder screw M7X0.75 special shape brass 1

5 2020CU600006X RF socket washer 60A 50% high spring silicon 1

6 2020CU600007X Knob washer 60A 50% high spring silicon 1

7 301060400001X Volume screw M6X0.75 special shape brass 1

8 2020CU600005X Power socket washer 60A 50% high spring silicon 1

9 2040CU600002X PTT metal dome plate 1

10 6020600100201 KEYBOARD PCB 1

11 2010CU600004X Ear phone cabinet PC+ABS 2950 1

12 1211401601001 SPEAKER 1

13 2020CU600001X PTT silicon key block 60A 50% high spring silicon 1

14 7100600240471 CU600-2 antenna 1

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BR200D-U1/BR300D-U1 Service Manual

15 2010CU600007X Encoder knob black ABS 700 1

16 2010CU600006X Volume knob black ABS 700 1

17 2020CU600003X Alarm silicon key orange 60A 50% high spring silicon 1

18 2010CU600010X Light-guider clear PC 1

19 4010CU600E01X LOGO LABEL 1

20 2010CU600008X Ear phone cover black TPU 1

21 2010CU600001X Radio front cabinet black PC+ABS 2950 1
22 2030CU600004X Spring Φ2.3X10.5 Φ0.25 spring steel Ni-plate 2
23 2040CU600003X Φ36mm air filter nylon weave 1

24 2010CU600009X Battery locker black PC+ABS 2950 1
25 2040CU600004X 7mm mic air filter Φ7.0X4.5X0.2 1

26 2020CU600004X Mic waterproof washer 60A 50% high spring silicon 1

27 2010DR600002X PTT plastic key blue PC+ABS 2950 1

28 301200407001X Machine screw M2.0X4.0 PB(+) Ni-plate nylok blue patch 13

29 MAIN PCB 1

30 2020CU600002X Cabinet waterproof ring orange 40A 50% high spring silicon 1

31 2030CU600001X AL cabinet polishing ADC 12 1

32 301200807001X

33 70600CB01001 Battery CB-01 (OR CB-02 70600CB02001) 1

34 7110CLP01001 CLP-01 clip 1

35 4010CLP01E01X Clip label 1

Machine screw M2.0X8.0 six lobe pan Ni-plate nylok blue
patch

2

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BR200D-U1/BR300D-U1 Service Manual

DR7000-2

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BR200D-U1/BR300D-U1 Service Manual

No. Parts No. Description Qty.
1 2010CU780002x CU780 LCD lens 12
2 2010CU600008X Ear phone cover
3 2010CU780001x CU780 cabinet
4 2020CU780002x Mic waterproof
5 LCD
6 1211401601001 speaker
7 2020CU600001X PTT silicon key
8 2010DR600002X PTT plastic key blue PC+ABS 2950
9 301200407001X Machine screw M2.0X4.0
10 2010CU600003X CU600 ear phone plastic plug
11 301060400001X Volume screw M6X0.75 special shape brass
12 2010CU600006X Volume knob black ABS 700
13 2010CU600007X Encoder knob black ABS 700
14 Antenna
15 2020CU600007X Knob washer silicon
16 301070500001X Encoder screw M7X0.75
17 2010CU600005X Radio top cover black
18 301250607001X Machine screw M2.5X6.0
19 2020CU600005X Power socket washer
20 7110CLP01001 CLP-01 clip
21 70600CB01001 Battery CB-01 (OR CB-02 70600CB02001)
22 2020CU600002X Cabinet waterproof ring
23 301200807001X Machine screw M2.0X8.0 six lobe pan
24 Main PCB
25 Key broad PCB
26 304200400001x Key screw 2X4
27 2040CU780001x Key broad dome
28 304200307001x Key broad screw 2X3
29 2010CU600009X Battery locker black PC+ABS 2950
30 2020CU780001x Key broad

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BR200D-U1/BR300D-U1 Service Manual

Chapter 5 Circuit Description

5.1 Frequency configuration

The reference frequency of frequency synthesizer is provided by 16.8MHz crystal oscillator X1 TCXO.

The receiver adopts quadric mixing mode. The first IF is 49.95MHz, and the second IF is 450kHz. The

first local oscillation signal of the receiver is produced by frequency synthesizer and the second local

rd

oscillation signal selects the 4

transmitter is produced by frequency synthesizer directly.

harmonics of 16.8MHz of crystal oscillator X1 TCXO. The signal of

Figure 1 Frequency configuration

5.2 Receiver（Rx）

The receiver is double conversion superheterodyne,designed to operate in the frequency range of

400 to 470MHz,The frequency configuration in Fig 1.1

Figure 2 Rec

eiver section configuration

Front End of Receiver

Signals from

the antenna are filtered by BPF which consists of C235 C236 C233 C604 C252 C951 C234

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BR200D-U1/BR300D-U1 Service Manual

C255 C260 L211 L209 L208 D201 D202 and D204 via RX/TX switch (D101 D102 and D103). After

being filtered out the useless out-of-band signals, the signals are amplified by LNA consisting of Q203

and external components.

Signals from LNA are filtered again by BPF which consists of C228 C226 C238 C229 C227 C239 C947

C259 C948 L214 L204 L203 D905 D203 and D206 before entering the 1st mixer (Q202).

The PWM wave is output by MCU composed of 58 foot and then commutated to adjustable voltage after

filtering to change the capacity of varactor diode D905 D203 D206 D201 D202 and D204 to control the

center frequency of BPF.

st

mixer

1

The first IF (49.95MHz) signal is produced after mixing of the receiving signal from LNA and the 1

st

local

oscillation signal from frequency synthesizer. The first IF signal is filtered out adjacent channel and other

useless signals by crystal filter (XF201).

IF Circuit

st

The 1

IF signal from crystal filter is amplified by the first IF amplifier (Q201) before processing of IC in

IF( IC200，NJM2591V or TA31136FN).

IF IC consists of the 2

nd

mixer, 2nd local oscillation, IF amplifier, limiter, frequency discriminator and noise

amplifier.

Frequency (16.8MHz) produced by TCXO(X1) is amplified and then selects 3

rd

harmonics (51.4MHZ) as

the second local oscillator signal source. The second IF signals (450kHz) are generated after signals

mixing of the second local oscillation (51.4MHz) and the first IF (49.95MHz) in IC200. Audio signals are

demodulated and outputted by IC200 after the second IF signals are amplified and limited in IC200 and

then filtered by ceramic filter(450kHz).

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BR200D-U1/BR300D-U1 Service Manual

Figure 3 Schematic Diagram for IF System

Receiving Audio Signal Processing:

The audio processing circuit of receiver consists of IC300. Voice signals from IC300 are sent to IC301
（CTCSS signaling filter circuit.

Squelch Circuit

Part of the AF signal from the IC200 enters the FM IC again,and the noise component is amplified

and rectified by a filter and an amplifier to produce a DC voltage corresponding to the noise level.

The DC signal from the FM IC goes to the analog port of the microprocessor(IC403).IC403

determines whether to output sounds from the speaker by checking whether the input voltage is higher

or lower than the preset value.

To output sounds from the speaker,IC403 sends a high signal to the MUTE and AFCO lines and turns

IC302 on through Q302 Q304 and Q305.

Audio Power Amplification

The audio power amplifying circuit consists of IC302 and the peripheral components.

The signals are amplified by audio power amplifier to drive the speaker after collecting the receiving

audio signals, voice signals and warning tone signals. The warning tone has no volume limitation.

When AFCO is high level, Q304 is on, IC302 begins to work and the speaker sounds. Speaker

Impedance: 16ohm

CTCSS Signal filtering

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