Uniden Benjamin User manual

Service Manual

CB TRANSCEIVER

Model BENJAMIN

UT -552B

uniden

CORPORATION

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TABLE OF CONTENTS

I. SPECIFICATIONS

A. GENERAL

B. MEASUREMENT CONDITIONS

C. TRANSMITTER

D. RECEIVER

E. GENERAL PERFORMANCE

II. ALIGNMENT PROCEDURES

A. CHECK OF FRONT PCB ASSEMBLY

B. ADJUSTMENT POWER SUPPLY PCB ASSEMBIY

C. PLL SECTION AND CARRIER OSCILLATOR SECTION

ADJUSTMENT_________________________________

D. ALIGNMENT PROCEDURE OF TRANSMITTER

E. ALIGNMENT PROCEDURE OF RECEIVER

F. FRE UENCIES OF LOCAL OSCILLATORS AND IF STAGE

IN RECEIVING STATE

___________________________

G. VOLTAGE CHART : TR & FED

III. MEASUREMENT CONDITIONS

A. SPECIFICATIONS

B. HOWLING TEST STANDARD

C. ALIGNMENT PROCEDURE

IV. BŁOCK DIAGRAM

V. SCHEMATICS/PC BOARDS/WIRING DIAGRAMS

A. EM2- : MAIN PCB (1/2) PARTS LIST ASSEMBLY

TOP VIEW

B. EM2—0123 : MAIN PCB (2/2) PARTS LIST

C. EM2—0125 : FRONT CH SW PCB PARTS ASSEMBLY

BOTTOM VIEW

D. EM3—0126 : PWR SUPPLY PCB PARTS ASSEMBLY

TOP VIEW

E. EM3-0127 : ADDITIONAL PARTS ON BOTTOM

F. EM4—0128 : SR PCB PARTS ASSEMBLY TOP VIEW

G. EM4—0181 : FM PCB PARTS ASSEMBLY

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TABLE OF CONTENTS

H. ES2— : SCHEMATIC DIAGRAM (1/3)

I. ES3—0025 : SCHEMATIC DIAGRAM (2/3)

J. ES4—0043 : SCHEMATIC DIAGRAM (3/3)

K. EW2—0022 : WIRING DIAGRAM (1/2)

L. EW3—0032 : WIRING DIAGRAM (2/2)

VI. BILL OF MATERIAL : 17 P.S

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I. SPECIFICATIONS

À. GENERAŁ

1. Channels

2. Frequency Range

3- Semiconductors

4. Crystal

5. Microphone

6. Speaker

7. An terma Connector

8. Jacks & Connector

9. Controls

10. Meter

11. Illuminations

12. Size

13. Weight

14. Accessories

B. MEASUREMENT CONDITIONS

1. Power Source

2. An terma Impédance

3. Test Température

4. AM/FM Modulation Frequency

5. SSB Modulation Frequency

Transmit Two Tone

6. Mean Signal Input Level

7. Standard Reference Modulation

8. Standard Reference Modulation

9. Standard Audio Output

10. Audio Frequency, SSB Receive

11. Audio Output Load

26.965 MHz - 27.405 MHz

46 Transistors, 83 diodes, 8 I.C.s

3 LEDS

500 û, Dynamic Type

16 û, 7 W Max

M - Type

MIKE-4P METAL, EXT SP-3.5 0.

Channel Selector, Mode Selector

(AM-USB-LSB), FM Mode Selector,

ON/OFF Power Switch & Volume & Squelchj

Mike Gain & RF Gain, Clarifier,

Hi Cut Switch, Noise Blanker-ANL Switch,

Channel 19 Switch

RF Output Power/Signal Strength

Channel Number Indication (LED),

TX Indication, RX Indication (LED)

W : 14 3/8"

H : 3 3/4"

D : 8 7/8"

3 Ibs. 2 oz.

Microphone, Microphone Hanger

220 V (AC)

50 û

25° C

1 kHz

500 Hz, 2.400 Hz

1.000 JJ V

1 kHz, 30%

1 kHz, ± 1.5 kHz Dev.

0.5 W

1 kHz

8 û Résistive

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12. Measuring Channel : 19

13. Standard Method of Measurement : EIA RS—382 (ISS : 8 — 26— 86)

C. TRANSMITTER

ITEMS MODE UNIT NOMINAL LIMIT

1. Frequency Tolérance at 25°C

(5 minutes after switch on) AM Hz ± 130 ± 800

FM Hz ± 130 ± 800

SSB Hz ± 130 ± 800

2. Carrier Power at No Modulation AM W43.6 - ■

FM W 4 3.6 - .

3. PEP Power, Two Tone, SSB SSB Wpep 12 10.8 - :

4. Spuriouś & Harmonie Emission AM dB - 65 - 60

FM dB - 65 - 60

SSB dB - 65 - 60

5. Carrier Suppression SSB dB - 50 - 40

6. Current Drain (AC) at No

Modulation AM mA 300 700

FM mA 300 700

SSB mA 150 300

7. Current Drain (AC)

AM : MAX Mod. AM mA 300 700

FM : MAX Dev. FM mA 300 700

SSB : MAX Wpep,

Two Tone SSB mA 300 350

8. Modulation Frequency Response

(1kHz, 0 dB reference)

Lower at 450 Hz AM dB - 4 - 8

FM dB - 10 - 10

SSB dB - 4 - 8

üpper at 2.5 kHz AM dB - 4 - 8

FM dB - 5 - 10

SSB dB - 4 - 8

9. Microphone Sensitivity

AM : For 50% Mod. AM mV 12

FM : For ± 1 kHz Dev. FM mV 12

SSB : For 6 Wpep SSB mV 12

10. AMC Range & ALC Range

AM : 50-100 % Mod. AM dB 50 40

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SSB : 9-13.2 Wpep SSB dB 50 40

11. Hum and Noise in Transmit

AM : 50 % Mod. AM dB 50 40

FM : For ± 1 . 5 kHz Dev. FM dB 40 30

12. Maximum Deviation FM kHz 2.7 3.5

RECEIVER

ITEMS MODE UNIT NOMINAL LIMIT

1. Max Sensitivity AM pv 0.50 1.5

SSB pv 0.25 0.50

2. Sensitivity

AM : For 10 dB S/N AM pv 1 2

FM : For 20 dB S/N FM pv 12

SSB : For 10 dB S/N SSB pv 0.25 0.50

3. AGC Figure of Merit 50 mV for

10 dB change in Audio Output AM dB 90 70

SSB dB 90 70

4. Overall Audio Fidelity

(6 dB down, 1 kHz ref.)

Upper Frequency AM Hz 2.000 1.500 ~ 3.000

FM Hz 2.500 1.500 - 4.000

SSB Hz 2.500 1.500 - 4.000

Lower Frequency AM Hz 250 200 ~ 500

FM Hz 250 100 ~ 500

SSB Hz 250 200 ~ 500

5. Distortion AM %2 7

FM %27

SSB %2 7

6. S/N Ratio at 1 mV Input AM dB 35 25

FM dB 40 30

SSB dB 40 30

7. Squelch Sensitivity at AM pv 12

Threshold FM W12

SSB pv 12

8. Squelch Sensitivity at Tight AM pv 1.000 250 - 4.000

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FM V1V 1.000 250 - 4.000

SSB pv 1.000 250 - 4.000

9. S-Meter Sensitivity at "S—9" AM pv 100 40 - 250

FM pv 100 40 - 250

SSB pv 100 40 - 250

10. RF Gain Range AM dB 40 30

FM dB 40 30

SSB dB 40 30

11. Audio Output Power at Maximum AM V 3 2.5

FM W 3 2.5

SSB W 32.5

12. Audio Output Power at 10 % THD AM W 2.5 2

FM W 2.5 2

SSB U 2.5 2

13. Hi-Cut Effect at 2 kHz AM dB - 6 - 3

FM dB - 6 - 3

SSB dB - 6 - 3

14. Clarifier Range AM Hz ± 1.500 ± 600- ± 2.500

FM Hz ± 1.500 ± 600- ± 2.500

SSB Hz ± 1.500 ± 600- ± 2.500

15. Noise Blanker Performance (EIA)

AM dB 36

FM dB 36

SSB dB 36

16. ANL & NB Loss at ipV Input AM dB 82 -12

17. Current Drain at No Signal AM mA 100 200

FM mA 100 200

SSB mA 100 200

18. Current Drain

at MAX Audio Output

Power AM mA 150 300

FM mA 150 300

SSB mA 150 300

19. Dropout Voltage (AC) AM V130 175

FM V130 175

SSB V130 175

20. Image Rejection Ratio AM dB 80 70

(for ± 910 kHz) FM dB 80 70

SSB dB 80 70

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21. Ist IF Rejection Ratio AM dB 80

(10.695 MHz) FM dB 80

22. 2nd IF Rejection Ratio AM dB 80

(455 kHz) FM dB 80

SSB dB 80

23. Adjacent Rejection (±1 0 kHz) AM dB 60

FM dB 70

SSB dB 70

E. GENERAL PERFORMANCE

1. Output Protection : Shall meet for 5 minutes for all VSWR's

(around the Smith Chart) of 20 : 1 without damage.

2. Output stability of all VSWR's (around the Smith Chart) of

up to 5 : 1 under continuous operation of a duty cycle of

5 minutes transmitting, and 1 minute receiving.

3. Reverse Polarity Protection : Shall hâve reverse polarity pro

tection and be operable with positive and negative grounding.

4. Standard Operating Température : -10°C ~ +55°C

5. Storage Température : -30°C - +70°C

6. Electrostatic Discharge Protection : Ail external case and

component parts shall withstand the application of 15 kV ESD

without causing failure or malfunction to the unit.

Test Conditions - Probe : 150pF with 500 û in sériés

Temp. : 25° C

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II . ALIGNMENT PROCEDURES

A. CHECK OF FRONT PCB ASSEMBLY

1. Préparations

Front PCB Check jig

2. Conditions

SuppJy Voltage : 110 V 60 Hz

Unless otherwise specified, S551, 552, 553 and 554 shall be switched

OFF.

3. Procedure

STEP ITEMS TO BE CHECKED

1 Rotate CH rotary switch and check if CH LED's in ail channels from

CHI - CH40 are correctly displayed. Furtherraore, check if there

are no notable différences in luminance.

2 When S554 is switched "ON", check that "19" is displayed on CH LED.

3 Check that me ter lamp, PL551 and 552 are always turned ON.

Likewise, there should be no notable différence in luminance.

4Check that TX LED and RX LED are properly lit. When the jig's PTT

is ON, the TX LED should be ON and the RX and jig's PA LEDs should

be OFF. When the jig's PTT is OFF, the TX, RX and PA LED indicators

output will be reverse.

5When S551 is switched ON, check that the jig*s NB/ANL LED turns ON.

6When S553 is switched ON, check that the jig*s hi—eut LED turns OFF.

FRONT PANEL JIG

FC004 FC006 FC005

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В . ADJUSTMENT POWER SUPPLY PCB ASS'Y

1. Préparations : Stabilized Power Supply (AC)

DC Voltmeter

2. Conditions : Supply Voltage : 220V 60 Hz (AC)

Probe Earth : TP10

3. Adjustment

STEF MODE MEASURING

DEVICÉ

CONNECTIONS

PT.S ТО

BE ADJ. PROCEDURE

1K.*

Standby DC

Voltmeter

to JP32.

VR801 Connect WA501 to power source

and switch power ON. Then

adjust so that DC Voltmeter

indication is 13.8 ± 0.1V.

VR801 is shown in Figure 4.

FIGURE 4

B801 PA—241

VR801

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