Spender DHS3600 User manual

Service manual SPENDER DHS3600

SERVICE MANUAL

SPENDER

MODEL DHS 3600

Service manual SPENDER DHS3600

CONTENTS

SPECIFICATION 3

CIRCUIT DESCRIPTION 4

ADJUSTMENT INSTRUMENT LIST 7

ADJUSTMENT PROCEDURES 8

LCD DISPLAY 9

SEMICONDUCTOR IDENTIFICATION 9-12

MAIN PC BOARD (TOP VIEW WITH COMPONENTS) 13

MAIN PC BOARD (TOP VIEW) 14

MAIN PC BOARD (BOTTOM VIEW WITH COMPONENTS) 15

MAIN PC BOARD (BOTTOM VIEW) 16

KEYBOARD PC BOARD (TOP VIEW WITH COMPONENTS) 17

KEYBOARD PC BOARD (TOP VIEW)… 18

KEYBOARD PC BOARD (BOTTOM VIEW WITH COMPONENTS) 19

KEYBOARD PC BOARD (BOTTOM VIEW) 20

ADJUSTMENT POINTS 21-22

BILL OF MATERIAL 23-25

BLOCK DIAGRAM 26

SCHEMATIC DIAGRAM

Service manual SPENDER DHS3600

SPECIFICATIONS

GENERAL

FREQUENCY RANGE…………………………………………………… 245.000 245.9875 MHz.

CHANNEL STEP………………………………………………………….. 12.5KHz.

FREQUENCY GENERAL………………………………………………... SYNTHESIZER (PLL)

MODULATION TYPE…………………………………………………….. FM (F3E)

DIMENSION……………………………………………………………….. 89(H)×53(W)×30(D) mm

WEIGHT (WITH BATTERY)……………………………………………… Approx. 230g

RECEIVER

SENSITIVITY……………………………………………………………… < 0.20µV at 12dB SINAD

SELECTIVITY……………………………………………………………... 60dB

SPURIOUS RESPONSE………………………………………………… 60dB

DISTORTION…………………………………………………………….... LESS THAN 5%

AUDIO OUPUT POWER……………………………………………….… > 400mW at 4Ω

TRANSMITTER

POWER OUTPUT………………………………………………………… 4.5W

FREQUENCY STABILITY……………………………………………….. ±5ppm (-20ºC ~ +60ºC)

HARMONIC AND SPURIOS EMMISION…………………………….… 60dB

FREQUENCY DEVIATION…………………………………………….… NO MORE THAN ±2.5kHz

AUDIO DISTORTION…………………………………………………..… LESS THAN 5%

FREQUENCY TABLE (80 CHANNELS)

UNIT: MHz

CH. FREQ. CH. FREQ. CH. FREQ. CH. FREQ. CH. FREQ.

1 245.0000 17 245.2000 33 245.4000 49 245.6000 65 245.8000

2 245.0125 18 245.2125 34 245.4125 50 245.6125 66 245.8125

3 245.0250 19 245.2250 35 245.4250 51 245.6250 67 245.8250

4 245.0375 20 245.2375 36 245.4375 52 245.6375 68 245.8375

5 245.0500 21 245.2500 37 245.4500 53 245.6500 69 245.8500

6 245.0625 22 245.2625 38 245.4625 54 245.6625 70 245.8625

7 245.0750 23 245.2750 39 245.4750 55 245.6750 71 245.8750

8 245.0875 24 245.2875 40 245.4875 56 245.6875 72 245.8875

9 245.1000 25 245.3000 41 245.5000 57 245.7000 73 245.9000

10 245.1125 26 245.3125 42 245.5125 58 245.7125 74 245.9125

11 245.1250 27 245.3250 43 245.5250 59 245.7250 75 245.9250

12 245.1375 28 245.3375 44 245.5375 60 245.7375 76 245.9375

13 245.1500 29 245.3500 45 245.5500 61 245.7500 77 245.9500

14 245.1625 30 245.3625 46 245.5625 62 245.7625 78 245.9625

15 245.1750 31 245.3750 47 245.5750 63 245.7750 79 245.9750

16 245.1875 32 245.3875 48 245.5875 64 245.7875 80 245.9875

Service manual SPENDER DHS3600

CIRCUIT DESCRIPTION

1. FREQUENCY CONFIGURATION

The receiver utilizes double conversion. The first IF is 45 MHz and the second IF is 455 kHz. The first

local oscillator signal is supplied from the X2 (44.545MHz).

2. RECEIVER SYSTEM

2-1 Front End (RF AMP)

The signal coming from the antenna passes through the transmit/receive switching diode circuit, is

amplified by the RF amplifier (Q10), and passes through a BPF. Then passes through the low-pass

filters and goes to the mixer.

2-2 First Mixer

The signal from the front end is mixed with the first local oscillator signal generated in the PLLcircuit

by Q11 to produce a first IF frequency of 45 MHz. The resulting signal passes through the F1,F2

MCF to cut the adjacent spurious and provide the optimum characteristics, such as adjacent

frequency selectivity.

2-3 IF Amplifier

The signal then passes through the first IF (Q35), and is amplified and goes to the IF IC (U8). U8

incorporates the functions of the second OSC, second mixer, second IF amplifier, detector, noise

amplifier, and noise detector. The signal input to the IC is mixed with the RF signal of the second

OSC to produce a 455kHz second IF signal. The signal is amplified by the IF amplifier. The signal

passes through the ceramic filter (F3) to provide the necessary selectivity. Finally, the signal is

detected by the IC (U8) and output as an AF signal.

2-4 AF Amplifier

The AF signal from the IF IC is amplified and decoded by IC (U8), and the signal passes through AF

VOL circuit and enters the audio power amplifier IC (U1) to drive the speaker.

2-5 Squelch

Part of the AF signal from the IF IC 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 (U4). U4 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, U4 sends a high signal to the MUTE and

turns U1 on though Q4, Q14, Q17.

Service manual SPENDER DHS3600

2-6 Receive Signaling

1) CTCSS

300 Hz-and-higher audio frequencies of the signal output from the IF IC are cut by a low-filter (U5).

The resulting signal enters the microprocessor (U4). U4 determines whether the CTCSS matches

the preset value, and controls the MUTE and the speaker output sounds in line with the squelch

results of that content.

3. PLL CIRCUIT

The PLL circuit generates the first local oscillator signal for reception and the RF signal for

transmission.

3-1 PLL

The receiver has a VCO (Q301), and the transmitter has another VCO (Q303). The generated signal

passes through Q20 buffer and Q17 amplifies. U3 incorporates the reference oscillation divider and

phase comparator functions. The input signal is divided into the signal according to the divide ratio

data from the microprocessor (U4). This signal divided from the reference signal enter the phase

comparator to produce a differential signal. The frequency control signal is output from the charge

pump. The signal passes through the passive LPF and goes to varicap to control the VCO frequency.

3-2 Reference Oscillator Circuit

The reference oscillator circuit in the PLL IC produces the 12.8MHz PLL reference frequency. To

stabilize the frequency, the characteristics of the 12.8MHz crystal oscillator are controlled.

4. TRANSMITTER

4-1 Transmit Audio

The modulation signal from the microphone is amplified by U9, passes through a reemphasis circuit,

and is amplified by the other to perform operation. Then the resulting signal goes to the VCO through

the VCO modulation terminal for direct FM modulation.

4-2 CTCSS Encoder

Anecessary signal for CTCSS encoding is generated by the U4 and U5, and is FM-modulated to the

PLL reference signal. Since the reference OSC does not modulate the loop characteristic frequency

or higher, modulation is performed at the VCO side by adjusting the balance.

4-3 VCO and RF Amplifier

The modulation signal is modulated to VCO by D305. The RF signal from the PLLis amplified by Q17

and Q33 to the sufficient level to drive the power transistor.

Service manual SPENDER DHS3600

4-4 Final Module

The VHF power transistor 2SK3476 is used to amplify the transmission power.

4-5 ANT Switch and LPF

The signal from the power transistor passes through the D101 SW and LPF and is output from the

ANT terminal. U4 and PTT are used to switch between transmission and reception.

4-6 Control System

The CPU U4 operates at 3.6864 MHz clocks. U6 controls the LCD driver.

4-7 Power Supply

The main of the system control is DC 7.4V.

Service manual SPENDER DHS3600

ADJUSTMENT INSTRUMENT LIST

INSTRUMENT SPECIFICATION

VHF Signal

Generator Frequency Range: 0.1 ~ 300MHz

Output Level: 0.1uV ~ 50mV

Digital Voltmeter Measuring Range: 1mV ~ 15V

Distortion Meter Measuring Range: 0.1 ~ 20%

Frequency Counter Frequency Range: 0.1 ~ 300MHz

Accuracy: ±1ppm or Better

Sensitivity: 100mV or Better

Oscilloscope Frequency Range: DC ~ 20MHz

Measuring Range: 0.01 ~ 15V

RF Power Meter Measuring Range: 0.1 ~ 10W

Frequency Range: 1 ~ 300MHz

Impedance: 50ohm

Stabilized Power Supply Output Voltage: 0 ~ 15VDC

Output Current: 3A or more

External Load Connection Type: 3.5Φmono

Impedance: 4ohm/0.5W

FM Modulation Analyzer Frequency Range: 20Hz ~ 5kHz

Measuring Range: 0 ~ ±10kHz

Audio Signal Generator Frequency Range: 20Hz ~ 5kHz

Output Level: 1mV ~ 1V

Service manual SPENDER DHS3600

ADJUSTMENT PROCEDURES

VCO SECTION

Item Condition Measurement Adjustment Specifications

Test Equipment Terminal Parts Method /Remarks

1.Setting 1) Power supply voltage

Battery terminal: 7.4V

2.VCO lock 1) CH: TX Lo Digital Voltmeter C319 Adjust to 2.0V

Voltage 2) CH: TX Hi Digital Voltmeter

3) CH: RX Lo Digital Voltmeter C306 Adjust to 2.0V

4) CH: RX Hi Digital Voltmeter

TRANSMITTER SECTION

Item Condition Measurement Adjustment Specifications

Test Equipment Terminal Parts Method /Remarks

1.Transmit 1) CH: TX Lo RF Power meter ANT L10, L13 Adjust it to

Power PTT: ON Ammeter 4.5W Check

2) CH: TX Hi RF Power meter ANT L10, L13 Adjust it to

PTT: ON Ammeter 4.5W Check

2.Transmit 1) CH: TX Center Frequency ANT VR2 Adjust to

Frequency PTT: ON counter ±500Hz or less

3.Modula- 1) CH: TX Center Modulation ANT VR1 Adjust to ±5kHz

tion analyzer

Oscilloscope MIC

Audio Signal

Generator

RECEIVER SECTION

Item Condition Measurement Adjustment Specifications

Test Equipment Terminal Parts Method /Remarks

1. Sensiti- 1) CH: RX Lo Oscilloscope ANT L1, L2, Adjust to the min.

vity CH: RX Center Distortion meter SPK L20, L21 Distortion and

best

CH: RX Hi

Signal to noise

ratio

Service manual SPENDER DHS3600

LCD DISPLAY DESCRIPTION

SEMICONDUCTOR IDENTIFICATION

2SS268 B561

2SK508 3SK240

2SC3356 2SC3357

2SC1923

Service manual SPENDER DHS3600

SEMICONDUCTOR IDENTIFICATION

24C04 (EEPROM)

LM386

HT1621B LCD DRIVER

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