Sanyo PLC-XU45 No audio signals at AV input circuit, No audio output signal at speaker

Troubleshooting

No Sound

1. No audio signals at AV input circuit.

Check audio signals at pins14 and 15 of IC5011 on the AV Board. Check IC5011 and peripheral circuits.

2.Incorrect operation of VIDEO/COMPUTER mode switching.

Check AV/PC switching signal at pins 10 and 11 of IC5011. Check IC5011, IC801 and switching signal.

AV : Low, PC : High

3.No audio output signal at speaker.

Check audio signal at pins 1 and 3 of K8F on the Main Board.

Check MUTE signal at pin 1 of IC001. Mute On : Low

Check MUTE signal at pin 7 of IC1831, pins 7 and 13 of IC1881, and peripheral circuit.

Mute On : High

Check sound volume signal at pin 4 of IC001, and pin 14 of IC1831.Check IC IC001, IC1831 and peripheral circuit.

Volume Min.: Low

4.No power supply at audio circuit.

Check 6V(6V AUDIO) power supply line.

AV BOARD									MAIN BOARD IC2161
							K10U		K3U	PC: H			D/A			Q1816
																Q1817
								29		AV: L	AV/PC				SCL2_5
												7	2			79,78
								30				7	3		SDA2_5
												8
		IC5011				IC001
		AUDIO-SW Q5072
						AUDIO
COMPUTER	PC_L/R		10		AV/PC	CONTROL
		1	11
AUDIO IN		13						27			VOLUME					IC801
			15		Q5031		4									SUB
						2		28
VIDEO	AV_L/R		14		Q5041			21								CPU
		2				1	6							IC1831
AUDIO IN		12					8						D/A
					Q011			24
										IC1881						Q1818
MONITOR			Q5051											14		Q1819
										BUFFER					SCL1_5
														2
AUDIO OUT			Q5061													80,81
				Q5081		MUTE On: H		31		MUTE			AUDIO MUTE	3	SDA1_5
					MUTE
				Q5082				32		7	13	MUTE On: H		7
									1,3	K8F
SPEAKER

Lens Motor Problems

1.No drive signals supplied at motors

Check drive signals at pins 1 to 4 of K6U on Power Board. Check ICs IC5501, IC5551 and peripheral circuits. Check motor drive power supply (9VMCI).

2.No drive signals supplied at motor drive ICs.

Check drive signals at pins 3-4 (ZOOM), 5-6 (FOCUS) of k6S. Check IC801.

3.No drive signals output from CPU.

Check drive signals at pins 29,30, 33, 34 of IC801(SUB CPU). Check IC801.

4.No key switch signals input to CPU.

Check signals at pins 50 to 52 of IC801 when pressing the key buttons. Check key buttons.

Logic Table of IC5501/IC5551

	Input		Output		Operation
4		5	7	1
H		L	L	H	Forward drive
L		H	H	L	Reverse drive
H		H	L	L	Braking
L		L	-	-	Stand by

FOCUS MOTOR

M

ZOOM

MOTOR

M

1

2

3

4

			Power	LEVEL +
	15V		Supply	LEVEL -
			Circuit	KEY SW BOARD
Q65A
	Q65B	Q65C

					IC1881
		ON: H		BUFFER
9V MCI	IC5551					POWER
		5V_SW	15	3	17		1
	FOCUS		16			ON: H
	MOTOR DRIVE

K6U		3		K6S K8S		FOCUS +
		1	4		6		33	52
						FOCUS -
		7	5		5		34	51
							IC801	50
		IC5501					SUB CPU
		ZOOM
	MOTOR DRIVE
		3	4			ZOOM +
		1			4		29
						ZOOM -
		7	5		3		30

POWER BOARD

FOCUS

ZOOM

K68A

3	4	5
3	4	5

K8A

MAIN BOARD

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