Kenwood TK-940 service manual LCD Assy B38-0731-05

DESCRIPTION OF COMPONENTS

Ref. No.	Parts No.	UseIFunction	Operation/Condition
	DTC114Eup		---
Q201		M u t i ~ l---l c h	Off when TX.
			---

Q202

D1 D2

1

(

DTC144EU	DC swlrch	Onloif bv no~se	1
02CZ18iX.Y)	_ _ - - -	L---
	I Voltage reference		--A
DSA3Al	1protection
	PeveIse current preventon

--		I	Surqe absorption
		m e x n c e
		/	Surae absorution
D l 1	I 1SS301	I	Reverse current oreventi011
			Surge absorption
			Voltage reference
	DAN235K		RF s w l ~ c h
	HSM88AS	I Larae* inuut urotectioli
D l 9	MI809		TWRX switch
, D20	MA4P1250		TWRX s w ~ t c h
D21	MI809	-	TWRX swltch
			--
D22	MA77		DC swltch
D201, 202	DA204K		Surge absorption	--
D203	1SS301		DC swltch

k	w h e n 5V or more and OV	or less--
I~	On when 5V or more and OV	or less.
	On when 5V or more and OV or less.		i

---

---

----

On when microphone mute on

PLL/VCO (X58-4170-XX)		-10 :TK-940 -11 :TK-941
Ref. No.	Parts No.		UseIFunction	OperationICondition
IC1	SC370651 F		PLL system	Or MC145190F-K	--
Q1	DTC143EK		Lock detect~onswltch	On when PLL unlocked	---
	2SA1586(Y',GRj		Lock detection switch	On when PLL unlocked
Q2					---
	-		Buffer amplifier
Q3	2SC3356
	2SK508NViK52)		Oscillator
	-		Buffer ampllfler
	2SC3356
Q53	2SC3356		Doubler
D1	1SS301		DC switch	On when PLL unlocked
D51, 52	1T363A		Vanable dlode	Frequency control	---
D53	MA360		Modulator
LCD ASSY (B38-0731-05)
Ref. No.	Parts No.		UseIFunction	OperationICondition
IC1	NJM78L05UA		Voltage regulator --	5V
IC2	75308BGK740BE9		M~croprocessor	--	--
ED1	638-0722-05		LCD