Kenwood TK-3131, TK-3130 Service Manual

UHF FM TRANSCEIVER

TK-3130/3131

SERVICE MANUAL

Antenna (T90-1004-05)

Button knob (PTT) (K29-9137-13)

Key top (K29-9136-12)

Cabinet assy (Front) (A02-3663-03) : 30K (A02-3705-03) : 31K (A02-3706-03) : A

Knob (VOL) (K29-9138-03)

Cap (P-jack) (B09-0627-03)

CONTENTS

GENERAL .................................................. 2

REALIGNMENT ......................................... 3

CIRCUIT DESCRIPTION ............................ 5

SEMICONDUCTOR DATA ........................ 9

DESCRIPTION OF COMPONENTS ........ 10

PARTS LIST ............................................. 11

EXPLODED VIEW.................................... 17

PACKING ................................................. 18

ADJUSTMENT ........................................ 20

PC BOARD VIEWS

TX-RX UNIT (X57-6460-XX) (B/2) ...... 24

TX-RX UNIT (X57-6460-XX) (A/2)...... 27

SCHEMATIC DIAGRAM.......................... 33

BLOCK DIAGRAM ................................... 37

LEVEL DIAGRAM .................................... 39

Photo is TK-3130.

30K : TK-3130 (K type) 31K : TK-3131 (K type) A : TK-3131 (A type)

TERMINAL FUNCTION ........................... 40

KNB-27N (Ni-MH BATTERY PACK) ........ 40

SPECIFICATIONS .................................... 41

TK-3130/3131

GENERAL

INTRODUCTION

SCOPE OF THIS MANUAL

This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains all required service information for the equipment and is current as of this publication date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions, which are issued as required.

ORDERING REPLACEMENT PARTS

When ordering replacement parts or equipment information, the full part identification number should be included. This applies to all parts : components, kits, and chassis. If the part number is not known, include the chassis or kit number of which it is a part and a sufficient description of the required component, for proper identification.

PERSONNEL SAFETY

The following precautions are recommended for person-

nel safety :

• DO NOT transmit until all RF connectors are secure and any open connectors are properly terminated.

• SHUT OFF this equipment when near electrical blasting caps or while in an explosive atmosphere.

• This equipment should be serviced by only qualified technicians.

SERVICE

This radio is designed for easy servicing. Refer to the

schematic diagrams, printed circuit board views, and alignment procedures contained within.

TK-3130

Destination Number of CH Frequency No. / Frequency / Color Factory default CH setting RF power output

K 2 channel 1 464.5000MHz Brown CH1 : 464.5500MHz / QT OFF 1W / 500mW

2 464.5500MHz Yellow Color : Yellow 3 467.7625MHz J CH2 : 467.9250MHz / QT OFF 4 467.8125MHz K Color : Blue Star 5 467.8500MHz Silver Star 6 467.8750MHz Gold Star 7 467.9000MHz Red Star 8 467.9250MHz Blue Star

All channels are Narrow band width. User can select channel frequency from above.

TK-3131

Destination Number of CH Frequency No. / Frequency / Color

Bank A Bank B

RX/TX RX TX

K 15 channel CH1 : 462.5625MHz CH1 : 462.5625MHz 462.5625MHz 1W / 500mW

CH2 : 462.5875MHz CH2 : 462.5875MHz 462.5875MHz CH3 : 462.6125MHz CH3 : 462.6125MHz 462.6125MHz CH4 : 462.6375MHz CH4 : 462.6375MHz 462.6375MHz CH5 : 462.6625MHz CH5 : 462.6625MHz 462.6625MHz CH6 : 462.6875MHz CH6 : 462.6875MHz 462.6875MHz CH7 : 462.7125MHz CH7 : 462.7125MHz 462.7125MHz CH8 : 462.5750MHz White CH8 : 462.5750MHz 467.5750MHz White CH9 : 462.6250MHz Black CH9 : 462.6250MHz 467.6250MHz Black CH10 : 462.6750MHz Orange CH10 : 462.6750MHz 467.6750MHz Orange CH11 : 462.5500MHz CH11 : 462.5500MHz 467.5500MHz CH12 : 462.6000MHz CH12 : 462.6000MHz 467.6000MHz CH13 : 462.6500MHz CH13 : 462.6500MHz 467.6500MHz CH14 : 462.7000MHz CH14 : 462.7000MHz 467.7000MHz CH15 : 462.7250MHz CH15 : 462.7250MHz 467.7250MHz

All channels are Wide band width. Factory default setting is Bank A.

RF power output

GENERAL

2 3

Antenna

Microphone

Speaker

TK-3131

Destination Number of CH Frequency No. / Frequency / Color RF power output

A 14 channel CH1 : 467.5125MHz 1W / 500mW

CH2 : 467.5250MHz CH3 : 467.5375MHz CH4 : 467.5500MHz CH5 : 467.5625MHz CH6 : 467.5750MHz CH7 : 467.5875MHz CH8 : 467.6000MHz CH9 : 467.6125MHz CH10 : 467.6250MHz CH11 : 467.6375MHz CH12 : 467.6500MHz CH13 : 467.6625MHz CH14 : 467.6750MHz

All channels are Narrow band width.

TK-3130/3131

GETTING ACQUAINTED

q PTT (Push to Talk) switch

Press and hold, then speak into the microphone to transmit.

w MENU key

Press to perform various functions. Press and hold while switching the power ON to enter Setting Mode.

e CAL key

Press before making a call, to alert the other party members.

t Power switch/Volume control

y MON key

u LED indicator

i SP/MIC jacks

keys Press to change the operating channel, to select a menu in Setting Mode, and to perform other functions.

Turn clockwise to switch the power ON and counterclockwise to switch the power OFF. Rotate to adjust the volume.

Press to monitor the current channel for activity.

Indicates the transceiver status.

Lift the covers and insert the accessory’s plugs here.

CIRCUIT DESCRIPTION

TK-3130/3131

Frequency Configuration

ANT

460~470MHz

ANT

AMP

BPF

AMP

421.15~

431.15MHz

460~470MHz

1st MIX

38.85MHz MCF

Fig. 1 Frequency configuration

Reception method Double super heterodyne

1st IF frequency 38.85MHz

2nd IF frequency 450kHz Transmission method VCO direct oscillation amplification Modulation Variable reactance phase modulation

Table 1 Basic configuration

450kHz

38.4MHz

PLL VCO

MIX, IF

DET

Tripler

AMP

TCXO

MIC

AMP

12.8MHz

MIC

Item Rating

Nominal center frequency (fo) 38.85MHz Pass bandwidth ±5.0kHz or more at 3dB Attenuation bandwidth ±18.5kHz or less at 35dB Ripple 1.0dB or less Insertion loss 4.0dB or less Guaranteed attenuation 70dB or more at fo–900kHz Terminating impedance 610Ω±10% / 3.0pF±0.5pF

Table 2 MCF (L71-0586-05) : TX-RX unit (B/2) XF1

Item Rating

Nominal center frequency (fo) 450kHz 6dB bandwidth ±6.0kHz or more 50dB bandwidth ±12.5kHz or less Ripple (at 450kHz±4kHz) 2dB or less Guaranteed attenuation 35dB or more (at 450kHz±100kHz) Insertion loss 6dB or less I/O matching impedance 2.0kΩ

Table 3 Ceramic filter (L72-0958-05) : TX-RX unit (B/2) CF1

Receiver System

■ Front End

The high-frequency signal from the antenna passes through a low-pass filter and a high-frequency switch (D12, L25 and D13) which switches between transmission and reception, and goes to the BPF (L42) to remove unwanted signals. The resulting signal is amplified by high-frequency amplifier (Q18) and goes to the first mixer (Q19).

■ First Mixer

The signal that reaches Q19 is mixed with the first local signal from the VCO to produce a first IF signal (38.85MHz). (Receive frequency – First local frequency = First IF frequency = 38.85MHz)

The first IF signal passes through MCF: XF1 (monolithic crystal filter) to remove unwanted signals.

The first IF signal is amplified by IF amplifier (Q20) and goes to IF IC (IC2).

ANT

BPF

RF AMP

LPF

ANT

D12 D13 L25

L42

1st MIXER

Q18

1st local OSC (PLL) 2nd local OSC

Q19

38.85MHz465.0MHz

ANT

1st local OSC

MCF

XF1

VCO

IF AMP

Q20

3T 3R

LPF

D12

L25

D13

1st IF : 38.85MHz

Q19

L42 BPF

XF1

Fig. 3 Receiver circuit

IF AMP, DET

IC2

AF AMP

IC208 SP

Q18

IF IC

Q20

Fig. 2 Receiver section configuration

TK-3130/3131

CIRCUIT DESCRIPTION

■ IF Amplifier

The IF circuit is integrated in the FM IC (IC2). The IF IC

contains local input, mixer, limiter amplifier, FM DET, and low-frequency amplifier.

The IF signal coming from the IF amplifier (Q20) goes to

the IF IC mixer and is mixed with the second local signal (38.4MHz) to produce a second IF signal. (38.85MHz – 38.4MHz = 450kHz)

The tripled PLL reference oscillation (12.8MHz x 3) is

used for the second local signal.

The second IF signal passes through ceramic filter (CF1)

to remove unwanted signals.

The second IF signal passing through the ceramic filter

passes through the limiter amplifier consisting six differential amplifiers and is detected.

The FM detection is quadrature detection method. The

phase of the output signal from the limiter amplifier is shifted by 90 degrees by a quad coil (L36) and compared with the original waveform to produce detection output.

■ Squelch Circuit

A squelch circuit is provided to prevent no-signal noise or

weak signals from outputting to a speaker during transmission.

■ AF Circuit

The FM IC output passes through the base band IC

(IC205), mute (Q213), and amplifier (IC207). After go to AF power amplifier IC (IC208). This IC have BTL amplifier function and electrical Volume. At internal speaker, BTL amplified. At external speaker, IC switch off the 1 channel amplifier by connectors information.

Transmitter System

■ Microphone Amplifier Circuit

The audio signal from the microphone passes through the MIC amplifier (IC207). Then, the signal goes through the base band IC (IC205) that has the 6dB/oct pre-emphasis circuit, band-pass filter (300 to 3kHz), amplifier, and limiter. The distortion components outside the audio band are removed by the splatter filter.

■ Modulation Circuit

The MIC amplifier (IC207) output passes through VR201 for modulation adjustment and goes to the modulation input of the VCO circuit for variable reactance phase modulation.

■ Transmission Output Circuit

The VCO output is amplified by a high-frequency amplifier (Q7~Q10), passes through a high-frequency antenna switch, passes through a low-pass filter and goes to the antenna.

The transmission output is about 1W with 3.8V DC supply at battery terminal.

■ Low-Pass Filter Circuit

A three-stage Chebyshev type low-pass filter is located between the antenna and transmit/receive switching circuit. It removes harmonic components contained in the transmission output.

MIC AMP IC207MIC

VCO Q4, Q5VR201

RF AMP Q7

PRE-DRIVE AMP Q8

INT. SP

J200

EXT. SP

PLL

BUSY

19 2452

MIXIN

38.4MHz

IC207

Amp

RSSI

Q22

X3TCXO

IC2

MIX

DET

MUTE Q213

VR202 AF VR

450kHz

AF MUTE

SP AMP

1st IF

Q212 Q214

Q20

IF amp

IC208

Amp

IC204

CPU

38.85 MHz

12.8MHz

Fig. 4 IF amplifier, squelch and

AF amplifier circuits

CF1

Q21

Noise ampD16

Amp

IC205

HPF LPF

DET

Amp

9 AFOUT

23 RXIN

DRIVE AMP Q9

FINAL AMP Q10

ANT SW D12,13

LPF

Fig. 5 Transmitter section configuration

IC205

IC207

D205

DET

Amp

MIC

Q210

MIC

MUTE

D204

MIC amp

Fig. 6 Microphone amplifier circuit

ANT

LPFIDC

CIRCUIT DESCRIPTION

CP1

XIN

PLL data (CPU)

STB

DATA

CPU (IC204) UL

VCO

Loop filter

VCO OUT

F OUT

FIN1

3C,T/R,MOD

PLL IC

IC1

TCXO

X1 12.8MHz

Vcont

TK-3130/3131

PLL System

■ VCO Circuit

The VCO is housed in a shield case.

The VCO circuit consists of a transistor (Q4), a variable capacity diode (D4) for frequency control, a variable capacity diode (D8) for modulation, transmit/receive frequency shift diode (D17), control transistor (Q2), variable capacitor (TC1) for PLL lock voltage control, and oscillator buffer amplifier (Q5).

C185

T/R

MOD

R11

R14

R146

C194

C27

R35

C198

C186

D17

L44

R36

L43

C36

TC1

R21

C32

In receive mode, the shift signal T/R goes low, Q2 turns off, and the shift diode (D17) not contact. Q4 produces the first local frequency for reception. (Receive channel frequency – 38.85MHz)

In transmit mode, the shift signal T/R goes high, Q2 turns on and D17 does conducts. Q4 produces about 460~470 MHz and the VCO frequency equals the transmit channel frequency.

The 3.0V circuit voltage is produced by ripple removing filter circuit Q3.

C38

R18

R17

R10

R126

R22

R23

C33

L11

C42

C41

C44

R15

L10

R24

C45

C29

R25

C46

VCO OUT

L12

R26

C30C31

■ PLL Circuit

Frequency data is sent to the PLL IC (IC1) from the CPU (IC204) as serial data when the power turns on, when the channel is changed, or when transmission begins. It sets the variable divider in the PLL IC.

The TCXO (X1) produce a 12.8MHz reference frequency. It is divided to produce a 12.5kHz PLL comparison frequency in the PLL IC.

The VCO input is divided by the divide ratio set by the divider in the PLL IC to generate 12.5kHz. It is compared with the reference comparison frequency by the phase comparator to detect a phase difference.

The charge pump circuit in the PLL IC converts it to a control voltage that can drive the VCO directly.

The control voltage passes through a loop filter which passes low frequency and is applied to the VCO control pin to control the oscillator frequency. The loop filter removes unwanted harmonics and noise contained in the output from the phase comparator and determines PLL response and synchronizing characteristics by the amplitude and phase characteristics (Fig. 8).

Fig. 7 VCO circuit

■ Unlock Detection Circuit

If the PLL cannot be synchronized for some reason or other when switching the channel or changing between transmission and reception, the PLL IC outputs a low unlock detection signal. This signal goes to the CPU to inhibit transmission when the PLL is unlocked.

Fig. 8 PLL circuit

TK-3130/3131

CIRCUIT DESCRIPTION

Control System

■ Reset Circuit

When a battery voltage is dropped, IC201 is detected low voltage, and this detected signal input to IC204 for stop the CPU function. IC200 is detected the reset voltage.

■ Battery Voltage Detection Circuit

The unit detects a low battery voltage and display the BATT indicator on the LCD. The battery voltage is divided and applied to the analog value input pin (BATT) of the CPU, and converted to a digital signal.

■ Power Supply Circuit

The power supply voltage is maintained to 3.0V by the series regulator (IC213). It is used as CPU power 3M. The 3C, 3R and 3T voltages are regulated by the IC209.

The B (battery voltage) is supplied to the RF final transistor Q10.

The transmission power 3T is supplied to the transmission output circuit when the CPU turns Q219 on only in transmit mode. 3T is junction to VR2 to generate PA gate (Q10) for power alignment.

The reception power 3R is provided to the receive and IF circuits when the CPU turns Q220 on only in receive mode.

The transmission/reception power 3C is supplied to the VCO and PLL circuits when the CPU turns Q218 on in transmit and receive modes.

If no signal is received for 10 seconds, the CPU enters the power save mode, and turns common power 3C and reception power 3R on for one cycle and off for three cycles according to the signals from the CPU to save the battery power.

■ QT/DQT

• Encode (Transmit)

QT/DQT signal is generated by CPU (IC204). Output signal (IC204 pin 40 (TO)) goes to TCXO modulation and VCO modulation (Through the VR200).

• Decode (Receive)

Detected AF signal go to IC206. Function of IC206 is LPF for sub-audible frequency. This signal goes to IC204 pin 20 (TI). IC204 is detected the QT or DQT.

IC204

CPU

Power

BATT

IC213

AVR

IC209 Q218

AVR

Q220

Q219

Fig. 9 Reset, battery voltage detection and

power supply circuits

TCXO

VR200

VCO

TX AF

IF IC

IC204

CPU

LPF

IC206 IC2

LPF

RX AF

Fig. 10 QT/DQT circuit

Microphone input

TX data/ RX data Control data

Frame detection

Receiver

– +

11 20

+VR1

Control register and data buffer

Reception output

HPF

– +

Com-

pressor

MODEM

Expander

+VR4

171819

emphasis

Scrambler

MSK

Pre-

De-

emphasis

De-

scrambler

Limiter

HPF

Splatter

filter

+VR2

BPF

LPF

+VR3

OSC

–

Transmission signal output

3.6864MHz

Reception

signal input

Fig. 11 AK2368 (IC205) block diagram

SEMICONDUCTOR DATA

CPU : MN101C54AKA (TX-RX UNIT (A/2) IC204)

■ Terminal function

Pin No. Port Name I/O Function

1~3 V1~V3 I LCD Voltage

4,5 NC I NC

6 AF MUTE O RXsignal AF Mute L : Mute

7 SEL I

8 SHIFT O Clock Frequency shift

9 VSS I GND

10 OSC2 O Clock oscillation out

11 OSC1 I Clock oscillation in

12 MMOD I GND

13 XI I NC

14 XO O NC

15 VDD I Power supply

16 RST I Reset L : Reset

17 VREF+ I GND

18 UL I PLL Unlock L : Unlock

19 BUSY I RX Busy Detect

20 TI I QT/DQT signal

21 BIAS I NC

22 BATT I Battery Voltage

23 VOX I VOX Level

24 RSSI I RX Carrier Level

25 VIB O Vibrator Control H : On

26 VREF– I GND

27 VDD I Power supply

28 TXD O to FPU Data

29 RXD I from FPU Data

30 TDATA O MSK TX Data

31 DIR O IC205 Control

32 SCLK O IC205 Clock

33 DI/O I/O IC205 Data

34 APC O TX Power H/L H : Low power

35 BEEP O Beep

36 PABC O Final SW

37 3CC O 3C SW L : On

38 3RC O 3R SW L : On

39 3TC O 3T SW L : On

40 TO O TX QT/DQT out

FET : 2SK3078 (Q9)

■ Absolute Maximum Ratings (Ta=25°C)

FET : NE5510279A (Q10)

■ Absolute Maximum Ratings (Ta=25°C)

TK-3130/3131

Pin No. Port Name I/O Function

41 BATT L I Battery Low

42 TCLK O MSK TX Clock

43 RDF I Detect MSK Data

44 VDD I Power Supply

45 PTT I PTT L : Press

46 MONI I MONITOR key L : Press

47 CALL I CALL key L : Press

48 UP I UP key L : Press

49 MODE I MODE key L : Press

50 DOWN I DOWN key L : Press

51 MICMUTE O MIC Mute H : Mute

52 SP AMP O AF AMP on/off H : On

53 PCLK O PLL IC Clock

54 PDATA O PLL IC Data

55 PEN O PLL IC Enable

56 ECLK O EEPROM Clock

57 EDATA I/O EEPROM Data

58 BACKLIT O LCD Lamp on/off H : On

59 RLED O Red LED on/off H : On

60 GLED O Green LED on/off H : On

61,62 NC O NC

63~76

77~79

80 NC O NC

SEG13~SEG0

COM0~COM2

Item VDSS VGSS ID Pch Tch Tstg

Rating 15V 5V 0.5A 3W 150°C –45~+150°C

Item VDSS VGSS ID Pch Tch Tstg

Rating 8.5V 6.0V 1.0A 2.4W 125°C –55~+125°C

O LCD

Tc=25°C

TK-3130/3131

DESCRIPTION OF COMPONENTS

TX-RX UNIT (X57-6460-XX)

Ref. No. Part Name Description

IC1 IC Phase locked loop system

IC2 IC IF system

IC200 IC Voltage detect

IC201 IC Reset switch

IC203 IC EEPROM

IC204 IC CPU

IC205 IC Base band

IC206 IC Active filter

IC207 IC MIC amplifier / Limiter

IC208 IC Audio power amplifier

IC209 IC Voltage regulator (3V)

IC213 IC Voltage regulator (3V)

IC214 IC Divider

Q1 Transistor RF amplifier

Q2 Transistor DC switch (T/R)

Q3 Transistor Ripple filter

Q4 Transistor VCO

Q5 Transistor RF buffer amplifier

Q6,7 Transistor RF amplifier

Q8 Transistor TX pre-drive

Q9 FET TX drive

Q10 FET TX final

Q11 Transistor Temperature protection switch

Q13 FET DC switch

Q14 Transistor DC switch (HI/LO)

Q18 FET RF amplifier

Q19 FET Mixer

Q20 Transistor IF amplifier

Q21 Transistor Noise amplifier

Q22 Transistor Tripler

Q200 Transistor DC switch (Backlight)

Ref. No. Part Name Description

Q201 Transistor DC switch (Busy)

Q202 Transistor DC switch (TX)

Q210 Transistor MIC mute / AGC

Q212 Transistor DC switch

Q213 FET Audio mute switch

Q214 Transistor AF amplifier power supply

Q216 FET Vibration switch

Q217 FET VOX switch

Q218 Transistor DC switch (3C)

Q219 Transistor DC switch (3T)

Q220 Transistor DC switch (3R)

Q221 Transistor Beat shift switch

D1 Diode Unlock detect

D3 Diode Current steering

D4 Variable Frequency control

capacitance diode

D8 Variable TX modulation

capacitance diode

D9,10 Diode RF switch

D12,13 Diode Antenna switch

D16 Diode Noise detect

D17 Diode Current steering

D200 LED LCD backlight

D201 LED TX / BUSY

D202 Diode AF detect

D204 Diode MIC mute / AGC switch

D205 Diode AGC detect

D208 Diode Surge absorption

D209 Diode Reverse protection

D210 Zener Diode Voltage protection

PARTS LIST

TK-3130/3131

CAPACITORS CC 45 TH 1H 220 J

1234 56 1 = Type … ceramic, electrolytic, etc. 4 = Voltage rating 2 = Shape … round, square, ect. 5 = Value 3 = Temp. coefficient 6 = Tolerance

• Temperature coefficient

1st Word C L P R S T U

Color* Black Red Orange Yellow Green Blue Violet

ppm/°C 0 –80 –150 –220 –330 –470 –750

• Tolerance (More than 10pF)

Code C D G J K M X Z P No code

(%) ±0.25 ±0.5 ±2 ±5 ±10 ±20 +40 +80 +100 More than 10µF – 10 ~ +50

–20 –20 –0 Less than 4.7µF –10 ~ +75

• Voltage rating

2nd word

1st word

0 1.0 1.25 1.6 2.0 2.5 3.15 4.0 5.0 6.3 8.0 – 1 10 12.5 16 20 25 31.5 40 50 63 80 35 2 100 125 160 200 250 315 400 500 630 800 – 3 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 –

ABCDEFGHJKV

CC45

Color*

2nd Word G H J K L

ppm/°C ±30 ±60 ±120 ±250 ±500

Example : CC45TH = –470 ± 60ppm/°C

• Capacitor value

010 = 1pF 100 = 10pF 101 = 100pF 102 = 1000pF = 0.001µF 103 = 0.01µF

2 2 0 = 22pF

Multiplier 2nd number 1st number

(Less than 10pF)

Code B C D F G

(pF) ±0.1 ±0.25 ±0.5 ±1 ±2

• Chip capacitors

(EX) C C 7 3 F S L 1 H 0 0 0 J

1 234 5 6 7

(Chip) (CH, RH, UJ, SL)

(EX) C K 7 3 F F 1 H 0 0 0 Z

1 234 5 6 7

(Chip) (B, F)

Refer to the table above.

1 = Type 2 = Shape 3 = Dimension 4 = Temp. coefficient 5 = Voltage rating 6 = Value 7 = Tolerance

RESISTORS

• Chip resistor (Carbon)

(EX) R D 7 3 E B 2 B 0 0 0 J

1 234 5 6 7

(Chip) (B,F)

• Carbon resistor (Normal type)

(EX) R D 1 4 B B 2 C 0 0 0 J

1 234 5 6 7

1 = Type … ceramic, electrolytic, etc. 5 = Voltage rating 2 = Shape … round, square, ect. 6 = Value 3 = Dimension 7 = Tolerance 4 = Temp. coefficient

Dimension (Chip capacitors)

Dimension code L W T

Empty 5.6 ± 0.5 5.0 ± 0.5 Less than 2.0

A 4.5 ± 0.5 3.2 ± 0.4 Less than 2.0 B 4.5 ± 0.5 2.0 ± 0.3 Less than 2.0

C 4.5 ± 0.5 1.25 ± 0.2 Less than 1.25 D 3.2 ± 0.4 2.5 ± 0.3 Less than 1.5 E 3.2 ± 0.2 1.6 ± 0.2 Less than 1.25 F 2.0 ± 0.3 1.25 ± 0.2 Less than 1.25 G 1.6 ± 0.2 0.8 ± 0.2 Less than 1.0 H 1.0 ± 0.05 0.5 ± 0.05 0.5 ± 0.05

Dimension

Dimension (Chip resistor)

Dimension code L W T

E 3.2 ± 0.2 1.6 ± 0.2 1.0 F 2.0 ± 0.3 1.25 ± 0.2 1.0 G 1.6 ± 0.2 0.8 ± 0.2 0.5 ± 0.1 H 1.0 ± 0.05 0.5 ± 0.05 0.35 ± 0.05

Rating wattage

Code Wattage Code Wattage Code Wattage

1J 1/16W 2C 1/6W 3A 1W 2A 1/10W 2E 1/4W 3D 2W 2B 1/8W 2H 1/2W

+ 21 hidden pages