Sony HCD-LX7, HCD-LX8 Service manual

HCD-LX7/LX8

SERVICE MANUAL

HCD-LX7/LX8 is the tuner, deck, CD and
amplifier section in LBT-LX7/LX8.	Photo: HCD-LX8

AEP Model

UK Model

HCD-LX7

E Model

Australian Model

HCD-LX8

		Model Name Using Similar Mechanism	HCD-DR4/XB500
CD
		CD Mechanism Type	CDM37M-5BD32L
SECTION
		Base Unit Type	BU-5BD32L
		Optical Pick-up Type	KSS-213D/Q-NP
TAPE DECK		Model Name Using Similar Mechanism	HCD-GRX10AV/RX110AV
SECTION		Tape Transport Mechanism Type	TCM-230PWR1

SPECIFICATIONS

— Continued on next page —

COMPACT HiFi STEREO SYSTEM

1

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

Notes on chip component replacement

•Never reuse a disconnected chip component.

•Notice that the minus side of a tantalum capacitor may be damaged by heat.

Flexible Circuit Board Repairing

•Keep the temperature of soldering iron around 270˚C during repairing.

•Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

•Be careful not to apply force on the conductor when soldering or unsoldering.

Laser component in this product is capable of emitting radiation exceeding the limit for Class 1.

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

This caution label is located inside the unit.

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN

THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

2

MODEL IDENTIFICATION

— BACK PANEL —

Parts No.

	MODEL	PARTS No.
LX7: AEP, UK, CIS model		4-225-529-1s
LX8: E, AR model		4-225-529-2s
LX8: SP, MY model		4-225-529-3s
LX8: MX model		4-225-529-4s
LX8: AUS model		4-225-529-5s
LX8: EA model		4-225-529-6s
• Abbreviation
SP	: Singapore model
MX	: Mexican model
AUS	: Australian model
EA	: Saudi Arabia model
AR	: Argentine model
MY	: Malaysia model

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body.

During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts.

The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION CHECK

Carry out the “S curve check” in “CD section adjustment” and check that the S curve waveform is output four times.

3

TABLE OF CONTENTS

1. SERVICING NOTE ..........................................................	5
2. GENERAL ....................................................................	9
3. DISASSEMBLY
3-1. Front Panel ..........................................................................	11
3-2. Main Board .........................................................................	11
3-3. Sub Panel ............................................................................	12
3-4. CD LID Assembly ..............................................................	12
3-5. Tape Mechanism Deck and Cassette LID ...........................	12
3-6. CD Mechanism Deck ..........................................................	13
3-7. Base Unit .............................................................................	13
3-8. Disc Table ...........................................................................	13
4. MECHANICAL ADJUSTMENTS ..........................	14
5. ELECTRICAL ADJUSTMENTS ...............................	14
6. DIAGRAMS
6-1. Circuit Boards Location ......................................................	17
6-2. Block Diagrams
• BD (CD) Section ..............................................................	18
• Deck Section ....................................................................	19
• Main (1/2) Section ...........................................................	20
• Main (2/2) Section ...........................................................	21
• Power Section (LX8 model) ............................................	22
• Power Section (LX7 model) ............................................	23
• Display Section ................................................................	24
6-3. Printed Wiring Board – BD (CD) Section – .......................	26
6-4. Schematic Diagram – BD (CD) Section – ..........................	27
6-5. Printed Wiring Board – Main Section – ..............................	28
6-6. Schematic Diagram – Main (1/3) Section – ........................	29
6-7. Schematic Diagram – Main (2/3) Section – ........................	30
6-8. Schematic Diagram – Main (3/3) Section – ........................	31
6-9. Schematic Diagram – Deck Section – .................................	32
6-10. Printed Wiring Board – Deck Section – ...........................	33
6-11. Schematic Diagram – Power Section – ............................	34
6-12. Printed Wiring Board – Power Section – .........................	35
6-13. Schematic Diagram – Panel FL Section – ........................	36
6-14. Printed Wiring Board – Panel FL Section – .....................	37
6-15. Schematic Diagram – Panel VR Section – .......................	38
6-16. Printed Wiring Board – Panel VR Section – ....................	39
6-17. Schematic Diagram – TC Panel Section – .......................	40
6-18. Printed Wiring Board – TC Panel Section – .....................	41
6-19. Schematic Diagram – CD Panel Section – .......................	42
6-20. Printed Wiring Board – CD Panel Section – ....................	43
6-21. Schematic Diagram – CD Motor Section – ......................	44
6-22. Printed Wiring Board – CD Motor Section – ...................	45
6-23. Schematic Diagram – Trans Section – (LX7 model) .......	46
6-24. Printed Wiring Board – Trans Section – (LX7 model) .....	47
6-25. Schematic Diagram – Trans Section – (LX8 model) .......	48
6-26. Printed Wiring Board – Trans Section – (LX8 model) .....	49
6-27. Schematic Diagram – Leaf SW Section – ........................	49
6-28. Printed Wiring Board – Leaf SW Section – .....................	49
6-29. IC Block Diagrams ...........................................................	50
6-30. IC Pin Functions ...............................................................	50

7. EXPLODED VIEWS

7-1. Case and Back Panel Section ..............................................		53
7-2. Front Panel Section 1 ..........................................................		54
7-3. Front Panel Section 2 ..........................................................		55
7-4. Chassis Section ...................................................................		56
7-5.	TC Mechanism Section 1 (TCM230PWR1) .......................	57
7-6.	TC Mechanism Section 2 (TCM230PWR1) .......................	58
7-7.	CD Mechanism Section (CDM37M-5BD32L) ...................	59
7-8.	Base Unit Section (BU-5BD32L) .......................................	60
8. ELECTRICAL PARTS LIST ........................................		61

4

SECTION 1

SERVICING NOTE

About CD-TEXT display

This unit is provided with a simple CD-TEXT display function.

The CD-TEXT contents of 20 tracks are displayed on the fluorescent display tube.

Since the function is simple, some special characters may not be displayed, or may be displayed as other characters.

MC Cold Reset

• The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the customer.

Procedure:

1. Press three buttons c/CLOCK SET , ENTER , and "/1 simultaneously.

2. “COLD RESET” is displayed on the fluorescent display tube and reset is executed.

CD Delivery Mode

• This mode moves the pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.

Procedure:

1.	Press		"/1	button to turn the set ON.
2.	Press				button and	"/1	button simultaneously.
			LOOP
3.	A message “LOCK” is displayed on the fluorescent indicator tube, and the CD delivery mode is set.

MC Hot Reset

•This mode resets the set with the preset data kept stored in the memory. The hot reset mode functions same as if the power cord is plugged in and out.

Procedure:

1.	Press three buttons	c/CLOCK SET	,	ENTER	, and	DISC 1	simultaneously.
2.	The fluorescent indicator tube becomes blank instantaneously, and the set is reset.

Sled Servo Mode

• This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the pick-up.

Procedure:

1.Press "/1 button to turn the set ON.

2.Press three buttons c/CLOCK SET , ENTER , and DISC 5 simultaneously.

3.The Sled Servo mode is selected, if “CD” is blanking on the fluorescent indicator tube.

4.With the CD in stop status, When the . AMS > knob is rotated in the clockwise direction, the pick-up moves outside. When rotated counterclockwise, it moves inside.

5.To exit from this mode, perform as follows:

1)Move the pick-up to the most inside track.

2)Execute MC cold reset. (Press the three buttons c/CLOCK SET , ENTER , and "/1 button simultaneously.)

Note:

•Always move the pick-up to most inside track when exiting from this mode. Otherwise, a disc will not be unloaded.

•Do not run the sled motor excessively, otherwise the gear can be chipped.

Change-over of AM Tuner Step between 9kHz and 10kHz

• A step of AM channels can be changed over between 9kHz and 10kHz.

Procedure:

1.Press "/1 button to turn the set ON.

2.Select the function “TUNER”, and press TUNER/BAND button to select the BAND “AM”.

3.Press "/1 button to turn the set OFF.

4.Press ENTER and "/1 buttons simultaneously, and the display of fluorescent indicator tube changes to “AM 9k STEP” or “AM 10k STEP”, and thus the channel step is changed over.

LED and Fluorescent Indicator Tube All Lit, Key Check Mode

Procedure:

1. Press three buttons c/CLOCK SET , ENTER , and DISC 2 simultaneously.

2.LEDs and fluorescent indicator tube are all turned on. Press DISC 2 button, and the key check mode is activated.

3.In the key check mode, the fluorescent indicator tube displays “K @ V0 J0”. Each time a button is pressed, “K”value increases. However, once a button is pressed, it is no longer taken into account.

“J” Value increases like 1, 2, 3 ... if rotating . AMS > knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “-” direction.

“V” Value increases like 1, 2, 3 ... if rotating VOLUME knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “-” direction.

4.To exit from this mode, press three buttons in the same manner as step 1, or disconnect the power cord.

5

AMS Test Mode

• This mode is used for checking the AMS operations of the tape deck.

JIG

7-819-039-12 Alignment tape, AMS-110A

Procedure:

1.Press the "/1 button to turn the set ON.

2.Set the tape (AMS-110A).

3.Press the three buttons c/CLOCK SET , ENTER , and DISC 3 button simultaneously.

4.“TEST MODE” is displayed on the fluorescent display tube.

5.Press the FUNCTION button and switch the function to the deck with the tape (AMS-110A).

6.Press the CD SYNC button. “AMS CHECK” is displayed on the fluorescent display tube and the tape is rewound.

7.AMS starts in the normal direction. If the AMS count is 2 at shut down, proceed to step 8. “NG” is displayed at other times, and the deck stops.

8.AMS starts in the opposite direction. If the AMS count is 2 at shut down again, “OK” is displayed. “NG” is displayed at other times.

Aging Mode

During the aging mode, both the CD player and tape deck are executed together.

• If an error occurs:

Aging stops, and the error state is displayed on the fluorescent display tube.

• If no error occurs:

Aging is repeated.

Procedure:

1.Press the "/1 button to turn the set ON.

2.Load 10 minute tapes with unbent rec-proof tabs in decks A and B.

3.Set CDs on the DISC 1 and DISC 4 tables.

4.Set the CD mode REPEAT to OFF and PLAY MODE to ALL DISCS.

(Press the

PLAY MODE

and

REPEAT

buttons to set these modes.)

5.

Press the

button to switch the function to “CD”.

FUNCTION

6.

Press the three buttons

,

, and

button simultaneously.

c/CLOCK SET

ENTER

DISC 4

7.Aging starts.

8.To end aging, press the "/1 button to turn the set OFF.

Aging Sequence:

Aging is performed in the following sequence.

• Tape Deck

1.The tape in deck A is rewound. “TAPE A AG-1” is displayed.

2.The FWD side of deck A is played for two minutes. “TAPE A AG-2” is displayed.

3.The tape in deck A is fast forwarded. “TAPE A AG-3” is displayed. Fast forward is carried out for 20 seconds or to the tape end.

4.The RVS side of deck A is played for two minutes. “TAPE A AG-4” is displayed.

5.The tape in deck A is rewound. “TAPE A AG-5” is displayed.

6.The FWD side of deck B is played for two minutes. “TAPE B AG-2” is displayed.

7.The tape in deck B is fast forwarded. “TAPE B AG-3” is displayed. Fast forward is carried out for 20 seconds or to the tape end.

8.The RVS side of deck B is played for two minutes. “TAPE B AG-4” is displayed.

9.The tape in deck A is rewound. “TAPE A AG-5” is displayed.

10.Repeated from step 2.

6

• CD

1.The tray rotates.

2.DISC 1 is chucked.

3.The TOC is read.

4.The first track is played for 2 seconds.

5.The last track is played for 2 seconds.

6.The tray rotates.

7.DISC 4 is chucked.

8.The TOC is read.

9.The first track is played for 2 seconds.

10.The last track is played for 2 seconds.

11.Repeated from step 1.

• Display when ended abnormally When the tape deck is abnormal:

The state when ended abnormally is displayed.

The contents of display are the same as that during aging.

When the CD player is abnormal:

A message indicating that errors such as “CD MEC ERR” have occurred.

Check the error contents in the following error history display mode.

Error History Display Mode

Mode which enables the history of error occurring in the CD player to be checked.

Execute this mode after ending the aging mode.

Procedure:

1. Press the "/1 button to turn the set ON.

2. Press the three buttons c/CLOCK SET , ENTER , and CD SYNC simultaneously.

3.A message such as “EMC@@EDC**” is displayed.

@@ : Number of mechanical errors (Up to three past errors)

**: Number of errors (NO DISC ERROR) which occurs after chucking (Up to three past errors)

4.When checking the history of mechanical errors, press the PLAY MODE button. When checking errors after chucking, press the REPEAT button to switch the display.

5.Press the "/1 button to end and turn the set OFF.

6.To erase the error history, perform COLD reset.

(Press the three buttons c/CLOCK SET , ENTER , and DISC 1 simultaneously.

•Viewing the mechanical error history display

(Switch the history by pressing the PLAY MODE button.)

7

Display

E@@M#*****

@@ : Error number. 00 is the newest.

#: Operating state of table

0 : Currently in the INITIAL mode

7: Currently rotating to the right

8: Currently rotating to the left A : Currently chucking down B : Currently chucking up

*: Invalid

•Viewing the NO DISC ERROR history display (Switch the history by pressing the REPEAT button.)

Display

E@@D##$$%*

@@ : Error number. 00 is the newest

##: Error contents

01:Focus error

02:GFS error

03:Setup error

$$ : Retries

00: NO DISC is determined without attempting chucking retry

02:NO DISC is determined after chucking retry.

%: State when determined as NO DISC

1: When stopped

2: At setup

3: At TOC READ

4: When accessing

5: When playing

6: When pausing

7: When manual searching (during play)

8: When manual searching (during pausing) * : Invalid

8

SECTION 2

GENERAL

Front Panel

				1	2	3		4	5	6		7		8	9	10	11 12 13 14	15
																											16
																											17
																											18
			74																								19
			73
			72																								20
			71
			70
			69																								21
			68
65	66			67
			64
61	62 63
																		22									23
59			60
																											24
	57			58																							25				26
54	55		56																					27			28						29
																											30				31
52	53
																							32				33
																											34
			51																								35
			50															36									37						38
			49																								39
			48
																											40
									47	46		45		44	43		42 41
														Photo : HCD-LX8

9

LOCATION OF PARTS AND CONTROLS

1	"/1(Power) button and indicator	26	H(B Deck) button and indicator	51	LOOP button
2	c/CLOCK SET button	27	x(B Deck) button	52	DIRECTION button
3	SLEEP button	28	m(B Deck) button	53	DOLBY NR button
4	REC button and indicator	29	M(B Deck) button	54	x(A Deck) button
5	DAILY button and indicator	30	X(B Deck) button and indicator	55	m(A Deck) button
6	TUNING - button	31	zREC (B Deck) button and indicator	56	M(A Deck) button
7	TUNING + button	32	HI-SPEED DUB button	57	h(A Deck) button
8	Display window	33	CD SYNC button	58	H(A Deck) button
9	ENTER/NEXT button and indicator	34	.AMS >knob	59	MIX MIC jack
10	TUNER MEMORY button	35	HX(CD) button and indicator	60	GUITAR jack
11	STEREO/MONO button	36	x(CD) button	61	MIC LEVEL knob
12	TUNING MODE button	37	m(CD) button	62	GUITAR LEVEL knob
13	GEQ control button	38	M(CD) button	63	SUPER WOOFER MODE button
14	PTY button (LX7 model only)	39	DISK SKIP button	64	SUPER WOOFER button and indicator
15	Remote sensor	40	VIDEO2 INPUT jacks	65	FILE MENU button
16	SYNC EQ button	41	REPEAT button	66	GEQ CTRL button
17	SYNC BASS button	42	PLAY MODE button	67	ENTER button and indicator
18	SURROUND button and indicator	43	DISC 1 button	68	GROOVE button and indicator
19	KARAOKE PON button	44	DISC 2 button	69	Equalizer indicators
20	FUNCTION button	45	DISC 3 button	70	EFFECT button and indicator
21	VOLUME knob	46	DISC 4 button	71	TUNER/BAND button
22	Z(A Deck) button	47	DISC 5 button	72	SPECTRUM ANALYZER button
23	Z(B Deck) button	48	EDIT button	73	DISPLAY button
24	PHONES jack	49	NON-STOP button and indicator	74	DEMO (STANDBY) button
25	h(B Deck) button and indicator	50	FLASH button

• AMS is the abbreviation for Automatic Music Sensor.

This section is extracted from instruction manual.

10

SECTION 3

DISASSEMBLY

Note: Follow the disassembly procedure in the numerical order given.

3-1. FRONT PANEL

9Connector(CN452)

8Flat type wire(CN303)	0Connector(CN702)
7Flat type wire(CN304)
6Flat type wire(CN431)	4Screw(BVTP3x8)
1Screw(BVTP3x8)

2Earth wire

5Two earth wirs

qdFront panel

3Connector (CN802)

qaScrew(BVTP3x8)

qsFour screws(BVTP3x8)

3-2. MAIN BOARD

4Screw(BVTP3x8)

1Two screws(BVTP3x8)

0Back panel

8Three screws(BVTP3x8)

qaTwo screws(BVTP3x8)

qsFan motor

7Two screws(BVTP3x8)

6Two screws(BVTP3x8)

5Seven screws(BVTP3x8)

9Connector(CN903)

3Tuner

2Flat type wire(CN1)

qdTwo screws(BVTP3x8)

qfMain board

11

3-3. SUB PANEL		3-4. CD LID ASSEMBLY
	5Five screws
1Three screws	(BVTP2.6x8)	2Spring(TC lid)
(BVTP2.6x8)
7Screw
(PTPWH3x10)
2Ornamental
plate

3Connector (CN812)

8Four screws (BVTP2.6x8)

Claw 4Connector (CN703)

9Front input board

	6Screw	3 Sab panel assembly
0Sub panel block	(PTPWH3x10)	1CD lid assembly

3-5. TAPE MECHANISM DECK AND CASSETTE LID

qsHolder(deck B)

qfHolder(deck A)

4Mechanism deck

1Two screws(BVTP2.6x8)

2Screw(BVTP2.6x8)

qdSpring(deck A)

7Screw (BVTP2.6x8)

qaSpring(deck B)

9Spring(TClid)

5Two screws (BVTP2.6x8)

3Screw(BVTP2.6x8)

6Screw(BVTP2.6x8)

0Bracket

8Spring(TClid)

12

3-6. CD MECHANISM DECK

3-7. BASE UNIT

1Five screws (BVTP3x8)

2CD mechanism deck

3Base unit

2Boss

1Yoke fitting

3-8. DISC TABLE

Note:

When the disc table is installed, adjust the positions of roller cam and mark B as shown in the figure, then set to the groove of disc table.

4Stop screw

A	2Screw (BVTP3X8

1Screw (BVTP3X8)

3Bracket (BU)

5Disc table

A

13

SECTION 4

MECHANICAL ADJUSTMENTS

Precaution

1.Clean the following parts with a denatured alcohol-moistened swab:

record/playback heads	pinch rollers
erase head	rubber belts
capstan	idlers

2.Demagnetize the record/playback head with a head demagnetizer.

3.Do not use a magnetized screwdriver for the adjustments.

4.After the adjustments, apply suitable locking compound to the parts adjusted.

5.The adjustments should be performed with the rated power supply voltage unless otherwise noted.

Torque Measurement

	Mode	Torque meter	Meter reading
			3.04 – 6.96 N • m
	FWD	CQ-102C	(31 to 71 g • cm)
			(0.43 – 0.98 oz • inch)
	FWD		0.20 – 0.58 N • m
		CQ-102C	(2 to 6 g • cm)
	back tension
			(0.02 – 0.08 oz • inch)
			3.04 – 6.96 N • m
	REV	CQ-102RC	(31 to 71 g • cm)
			(0.43 – 0.98 oz • inch)
	REV		0.20 – 0.58 N • m
		CQ-102RC	(2 to 6 g • cm)
	back tension
			(0.02 – 0.08 oz • inch)
			6.97 – 14.02 N • m
	FF/REW	CQ-201B	(71 to 143 g • cm)
			(0.98 – 1.99 oz • inch)
			0.98 N • m or more
	FWD tension	CQ-403A	(100 g or more)
			(3.53 oz or more)
			0.98 N • m or more
	REV tension	CQ-403R	(100 g or more)
			(3.53 oz or more)

SECTION 5

ELECTRICAL ADJUSTMENTS

DECK SECTION		0 dB=0.775V

1.Demagnetize the record/playback head with a head demagnetizer.

2.Do not use a magnetized screwdriver for the adjustments.

3.After the adjustments, apply suitable locking compound to the parts adjusted.

4.The adjustments should be performed with the rated power supply voltage unless otherwise noted.

5.The adjustments should be performed in the order given in this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjustment.)

6.The adjustments should be performed for both L-CH and R-CH.

7.Switches and controls should be set as follows unless otherwise specified.

Tape	Signal	Used for
P-4-A100	10 kHz, –10 dB	Azimuth Adjustment
WS-48B	3 kHz, 0 dB	Tape Speed Adjustment
P-4-L300	315 Hz, 0 dB	Level Adjustment

Record/Playback Head Azimuth Adjustment

(Deck A, Deck B)

Note: Perform this adjustments for both decks.

Procedure:

1. Mode : Playback

test tape
P-4-A100
(10kHz, –10dB)	MD OUT	level meter

set	+
	–

2.Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1 dB of peak.

L-CH	output
peak		within
	level
		1 dB		within 1dB
	R-CH
screw	peak
position				screw
		L-CH	R-CH
				position
		peak	peak

14

3. Mode: Playback

test tape P-4-A100 (10kHz, –10dB)

main board
CN301
Pin 3 (L-ch)	oscilloscope
Pin 2 (GND)
L
set
R
Pin 1 (R-ch)

Waveform of oscilloscope

in phase	45°	90°	135°	180°
	good			wrong

4.After the adjustments, apply suitable locking compound to the parts adjusted.

Adjustment Location: Playback Head (Deck A)

Record/Playback/Erase Head (Deck B)

Remove the cassette lid.

Reverse Foward

Tape Speed Adjustment (Deck A)

Note: Set the test mode using the following method and begin tape speed adjustment.

In the test mode, the speed will switch to double speed or normal speed each time the HI-SPEED DUB button is pressed.

Procedure:

With the power turned ON, press the c/CLOCK SET button, ENTER button, and DISC 3 button simultaneously.

(The “VOLUME” on the fluorescent display tube will blink while in the test mode.)

To exit the test mode, press the "/1 button.

1.Insert the WS-48B into deck B.

2.Press the H button of deck B.

3.Press the HI-SPEED DUB button and play the tape at double speed.

4.Adjust RV1001 of the LEAF SW board so that the reading of the frequency counter becomes 6000 ± 180 Hz.

5.Press the HI-SPEED DUB button and play the tape at normal speed.

6.Adjust RV1002 of the LEAF SW board so that the reading of the frequency counter becomes 3000 ± 90 Hz.

Adjustment Location: LEAF SW board

Sample Value of Wow and flutter

W.RMS (JIS) less than 0.3% (test tape: WS-48B)

Playback Level Adjustment (Deck A, Deck B)

Procedure:

Mode: Playback

test tape P-4-L300 (315Hz, 0dB)

level meter

set

main board

CN301

Pin 1 (R-ch)

Pin 3 (L-ch)

Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301 (L-CH) and RV401 (R-CH)

so that adjustment within the following adjustment level.

Adjustment level:

CN301 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level difference between the channels: within ± 0.5 dB

Adjustment Location: AUDIO board

Adjustment Location

[LEAF SW BOARD]

RV1001(High Speed)

RV1002(Normal Speed)

RV1002 RV1001

15

Record Bias Adjustment (Deck B)

Procedure:

INTRODUCTION

When set to the test mode performed in Tape Speed Adjustment, when the tape is rewound after recording, the “REC memory mode” which rewinds only the recorded portion and playback is set.

This “REC memory mode” is convenient for performing this adjustment. During recording, the input signal FUNCTION will automatically switch to VIDEO 1.

(After recording, press the m button without stopping will return to the position where recording was started.)

1.Press FUNCTION button to select VIDEO 1. (This step is not necessary if the above test mode has already been set.)

2.Insert a tape into deck B, press the z REC button, and then press the H button to start recording.

3.Mode: Record

VIDEO 1 (AUDIO) IN

1)315 Hz } 50 mV (–23.8 dB)

2)10 kHz

AF OSC	blank tape
600 Ω	CS-123
attenuator
	set

4. Mode: Playback

recorded	level meter
position

set

main board

CN301

Pin 1 (R-ch)

Pin 3 (L-ch)

Record Level Adjustment (Deck B)

Procedure:

INTRODUCTION

When set to the test mode performed in Tape Speed Adjustment, when the tape is rewound after recording, the “REC memory mode” which rewinds only the recorded portion and playback is set.

This “REC memory mode” is convenient for performing this adjustment. During recording, the input signal FUNCTION will automatically switch to VIDEO 1.

(After recording, press the m button without stopping will return to the position where recording was started.)

1.Press FUNCTION button to select VIDEO 1. (This step is not necessary if the above test mode has already been set.)

2.Insert a tape into deck B, press the z REC button, and then press the H button to start recording.

3.Mode: Record

VIDEO 1 (AUDIO) IN 315Hz 50 mV (–23.8 dB)

AF OSC	blank tape
600 Ω	CS-123
attenuator
	set

4. Mode: Playback

recorded		level meter
position
	set
	main board
	CN301
	Pin 1	(R-ch)
	Pin 3	(L-ch)

5.Confirm playback the signal recorded in step 2 become adjustment level as follows.

If these levels do not adjustment level, adjust the RV341 (L-CH) and RV441 (R-CH) on the AUDIO board to repeat steps 3 and 4.

Adjustment level: The playback output of 10 kHz level difference against 315 Hz reference should be ± 1.0 dB.

Adjustment Location: AUDIO board

5.Confirm playback the signal recorded in step 2 become adjustment level as follows.

If these levels do not adjustment level, adjust the RV301 (L-CH) and RV351 (R-CH) on the MAIN board to repeat steps 3 and 4.

Adjustment level:

CN301 playback level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)

Adjustment Location: MAIN board

Adjustment Location:			[MAIN BOARD] (Conductor Side)
[AUDIO BOARD] (Conductor Side)
RV341(Lch),RV441(Rch)	RV311(Lch),RV411(Rch)
Record Bias	Playback Level (Deck A)
RV301 RV401					Record Level (Lch)
			CN301		RV301
		RV411
RV441 RV341	RV311
			3
			1
				43	42
RV301(Lch),RV401(Rch)			IC301	56	29
				1	28
Playback Level (Deck B)				14 15
			RV351
			Record Level (Rch)

16

CD SECTION

Note:

1.CD Block is basically constructed to operate without adjustment. Therefore, check each item in order given.

2.Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.Use an oscilloscope with more than 10MΩ impedance.

4.Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

S Curve Check	oscilloscope
BD board
TP (FE)	+
TP (VC)	–

Procedure :

1.Connect the oscilloscope to test points TP (FE) and TP (VC).

2.Connect TP (FE1) and GND, and TP (AGCCON) and GND of the BD board with lead wires.

3.Press the "/1 button to turn the set ON.

4.With the disc (YEDS-18) loaded, press the HX button and perform focus search. (Focus search will be performed in the same way even while the disc table is pushed in and out.)

5.Check the symmetry and peak to peak level of the oscilloscope waveform (S curve) at this time.

S-curve waveform

symmetry

A

Within 3 ± 1 Vp-p

B

6. After check, remove the lead wire connected in step 2.

Note: • Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7.

•Take sweep time as long as possible and light up the brightness to obtain best waveform.

RF Level Check

	oscilloscope
BD board
TP (RF)	+
TP (VC)	–

Procedure :

1.Connect oscilloscope to test point TP (RF) and TP (VC) on BD board.

2.Press the "/1 button to turn the set ON.

3.Put disc (YEDS-18) in and playback 5 track.

4.Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.

Note: Clear RF signal waveform means that the shape “◊” can be clearly distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV

TIME/DIV : 500ns

level : 1.45 ± 0.25 Vp-p

HCD-LX7/LX8

SECTION 6

DIAGRAMS

E-F Balance (1 Track Jump) check

6-1. CIRCUIT BOARDS LOCATION

	oscilloscope
BD board
TP (TE)	+
TP (VC)	–

Procedure:

1.Connect oscilloscope to test point TP (TE) on BD board.

2.Press the "/1 button to turn the unit ON.

3.Put disc (YEDS-18) in to play the number five track.

4.Press the HX button.

5.Check the level B of the oscilloscope's waveform and the A (DC voltage) of the center of the Traverse waveform.

Confirm the following:

•A/B x 100 = less then ± 22 (%)

•B = 1.3 ± 0.6 Vp-p

1 track jump waveform

SUB TRANS board (LX7)

TUNER UNIT

PANEL-FL board

MIC board
TC-A board	TRANS board	MAIN board

Center of the waveform
B	PANEL-VR board
A (DC voitage)	TC-B board
0V
	HEADPHONE board
Symmetry
level : 1.3 ± 0.6 Vp-p

Adjustment Location :

[ BD BOARD ] — SIDE A —

CD-L board

PA board

	CD-R board
TP	FRONT INPUT board
(VC)	TABLE SENSOR board
TP	LEAF SW board
(RF)
TP
(AGCCON)
TP (FE)	AUDIO board

TP

(TE) TP BD board

(FE1)

CD MOTOR board

LED board

17 17

HCD-LX7/LX8

6-2. BLOCK DIAGRAMS

– BD (CD) SECTION –

OPTICAL PICK-UP BLOCK

(KSS-213B/K-N)

IC101

DETECTOR

IC103

DIGITAL SERVO

E

VCC

DIGITAL SIGNAL PROCESSOR

RF AMP

16K

A

VC

A

RAM

5

C

C

RF

A

C

7

RF EQ

RF

RF AC

EFM

D

D

SUMMING

16

51

B

D

B

8

B

AMP

AMP

DEMODULATION

6

F

FOCUS

FF

INTEG-

ASY1

ERROR

14

49

AMP

RATOR

ASYMMETRY

DIGITAL

48

ASY0

CORRECTION

PLL

E

11

E

TRACKING

TE

F

10

F

ERROR

13

AMP

LD

LD

DRIVE

3

VC

12

Q101

BUFFER

VC

4

PD

APCLD/PD

LDON 22

AMP

FD

LASER

VC

38

VC

DIODE

VREF

CE

42

RFDC

PD

43

FE

OPERATIONAL

39

A/D

TE

AMPLIFIER

HOLD SW

REF

41

CONVERTER

ANALOG

21

15

INTEG-

SE

SWITCH

LD

IC102

40

RATOR

POWER

FOCUS/TRACKING COIL DRIVE

SPINDLE/SLED MOTOR DRIVE

CE

T+

42

11 CH2OUTR

TRACKING

TFDR

PWM

COIL

T–

CH2FIN

5

SERVO DSP

12

CH2OUTF

TRDR

GENERATOR

CH2RIN

6

TFDR

TRACKING

F+

30

TRACKING

14 CH1OUTF

TRDR

PWM

FOCUS

FFDR

31

GENERATOR

SERVO

COIL

F–

13

CH1OUTR

CH1FIN

2

FFDR

FRDR

FOCUS

CH1RIN

32

FOCUS

3

FRDR

PWM

SD+

33

SERVO

M102

17 CH3OUTF

GENERATOR

SLED

M

CH3RIN

23

SRDR

29

SRDR

SLED

SLED

MOTOR

SD–

18

CH3OUTR

SFDR

SFDR

PWM

CH3FIN

24

28

SERVO

GENERATOR

M101

SP+

15 CH4OUTF

SPINDLE

M

CH4SIN 25

26

MDP

DIGITAL

MOTOR

SP–

16

CH4OUTR

CLV

CH4BIN

27

VC

MUTE 20

•SIGNAL PATH

: CD

09	: Digital out

DATA BUS

SUBCODE

PROCESSOR

SERIAL IN

INTERFACE

OVER SAMPLING DIGITAL FILTER

3rd ORDER NOISE SHAPER

PWM PWM

		XTA1
	TIMING	66	X101
ERROR	LOGIC	STAO	16.9344MHz
CORRECTOR		67
D/A	DIGITAL	D OUT	DOUT
INTERFACE	OUT	60

		XRST	3	XRST
		SQSO	1	SQSO
		SQCK
			2
	CPU	SENS	8	SENS
	INTERFACE	DATA
	SERVO		5	DATA
	AUTO	XLAT
			6	XLT
	SEQUENCER
		CLOK
			7	CLOK
		SCOR	20	SCOR
		XLON
			14
	SERVO	SCLK	9	SQCK
		SSTP
	INTERFACE		27	+5V
				S101
		RMUT	79	LIMIT SW
		LMUT	80
		LMUT	70
		AIN1	71
		LOUT1	72	L OUT
		LOUT2	77
		AIN2		HOLD
			76
		LOUT2	75	R-CH

DISC

SENSOR TRAY SENS

IC202

	S201	UP SW
		IC201
	(UP SWITCH)
		MOTOR DRIVER

M201

3

OUT 2

IN 2

1

TBL-R

TABLE

M

MOTOR

7

OUT 1

IN 1

9

TBL-L

+5V

LED SW

LED

Q201

D201

(DISC No.)

A

MAIN

SECTION

(Page 20, 21)

18 18

HCD-LX7/LX8

– DECK SECTION –

S1004

S1008

PB A/B

MS OUT

A CrO2

B CrO2

CN301

RV311

3

R CH

16

17

19

28

27

26

IC611

PLAYBACK

1

PB-A/B

A 120/70 B NORM/CROM/

LEVEL

MS

L

DECK A

70

METAL

A IN

PAS

48

PB OUT

HP101

40

TC PB L

46

B IN

120

PB HEAD

R CH

DOL

LM ON/ 25

LM ON/OFF

(DECK A)

R

DOLBY NR

OFF

DOLBY NR

NORM/

RV301

IC301

NORM/HIGH

HIGH

18

IC601

PLAYBACK

NR ON/

23

NR ON/OFF

LEVEL

OFF

L

DECK B

RV301

24

REC/PB/PASS

PB

REC/PB HEAD

REC LEVEL

RECOUT

DOLBY

(DECK B)

39

LIN

R

R CH

TYPE B

43

TC REC L

36

EQOUT

EQIN

38

BIAS SW

BIAS ON/OFF

20

BIAS ON/OFF

RM ON/OFF

22

RM ON/OFF

3

1

D

M

ALC ON/OFF

15

ALC ON/OFF

IC602

32

31, 33

P

R

RELAY

HRPE101

4

REC/PB

CAP MOTOR

CAPM CNT1

RV341

CAPM CNT2

CONTROL

REC

+7.5V

Q336-343

BIAS

Q623

M1

SPEED

SWITCH

CAPSTAN

M

CONTROL

CAP M H / L

Q335

MOTOR

Q1001

B

REC BIAS

ERASE BIAS

BIAS OSC

T621, Q621, 622

ERASE HEAD X				MAIN
RV1002	RV1001			SECTION
			REEL	(Page 20, 21)
NORMAL	HIGH
SPEED	SPEED		DETECT	A SHUT
			IC1001
			REEL
			DETECT	B SHUT
			IC1002
• R CH : Same as L ch			S1001 (A PLAY)
		+5V		A PLAY
• SIGNAL PATH			S1002 (B PLAY)	B PLAY
: PB (DECK A)
: PB (DECK B)		S1003		A HALF
: REC (DECK B)		(A HALF)	+5V
			+5V
		S1005
		(REC A)
09		S1006		B HALF/REC A/REC B
		(B HALF)
		S1009
		(REC B)

•PLUNGER SOLENOID is supplied as the MECHANICAL BLOCK ASSY.

A DECK/		TRIGGER			B TRIG
		MOTOR
B DECK
		CONTROL
PLUNGER					A TRIG
		Q331-334

19 19

HCD-LX7/LX8

– MAIN (1/2) SECTION –

			IC191
	J804	AV SWITCH
VIDEO 2	6	IN3
IN
										J702
			VD OUT 10								VIDEO
											OUT
	J702
VIDEO	1	IN1						IC101
IN
		A	B	C			SOUND PROCESSOR 1
											D
		2	3	5	IC601			L+R	30	SPEANA
		46	45	28
	J701				PHONO AMP					J701
PHONO					3	1	IN A2	REC B2	57		MD OUT
(L IN)						69

FM/AM TUNER

E

TUNER UNIT IS

ST-L

68

IN B2

BUS OUT2

36

L-CH SIG

SUPPLED AS THE

ASSEMBLED

TC REC L

BLOCK

REC A2

58

MUTE

DECK

SWITCH

B

SECTION

TC PB L

67

IN C2

BBA2

39

Q113

(Page 19)

EXCEPT

B

CD

A

D OUT

LX7/LX8:MX

TC REC L

SECTION

JW704

(Page 18)

CD-L

66

IN D2

J701

BBB2

38

MD (L IN)

65

IN E2

SWITCH

Q112

C

SWITCH

POWER

MIC-SIG

2

MIC IN

Q111

SECTION

7

IC181 SELECTOR

(Page 22,

V1, AU

J701

23)

12

X0

(L IN)

J804

BUF IN2

37

V2, AU,

14

X1

X

13

64

IN F2

SWITCH

L-CH IN

Q115

IC781

LATCH

DATA

CLOCK

34

34

33

32

OPTICAL

A

B

TRANSMITTING

10

9

CD

D OUT

46

45

DIGITAL

38

47

48

OUT

LX7/LX8:MX ONLY

MAIN CONTROL

IC501 (1/2)

CD

J705

(LIN)

CD

J805

DBFB-H/L

7

7

28

(L OUT)

V-MUTE

28

34

SW-MODE

34

38

493-LAT

38

45

FUNC-SEL1

45

46

FUNC-SEL0

46

47

MUTE

493-DATA

47

48

SWITCH

6

LINE-MUTE

493-MUTE

48

Q803

			MUTE	3 F-RELAY		AC-CUT 22	RESET	F
			SWITCH		RESET
	• R CH: Same as L ch	D807	Q804
					12
	• SIGNAL PATH				RESET			G
	: FM						DBFB
					SWITCH
	: CD	RESET			Q801		F-RELAY
	: PB
		SWITCH
	: REC	Q802				D805
					RESET
	: VIDEO/MD					+5v
					IC801
09	: Digital out

DISPLAY

SECTION

(Page 24)

POWER

SECTION

(Page 22, 23)

DECK

SECTION

(Page 19)

DISPLAY

SECTION

(Page 24)

POWER

SECTION

(Page 22, 23)

20 20

HCD-LX7/LX8

– MAIN (2/2) SECTION –

H

POWER

SECTION

(Page 22, 23)

A

BD (CD)

SECTION

(Page 18)

B

DECK

SECTION

(Page 19)

FM/AM TUNER

TUNER UNIT IS SUPPLED AS THE ASSEMBLED BLOCK

09

MAIN CONTROL

IC501 (2/2)

1

43

LX7

STK-POWER

1

FAN DET

POWER

42

HP.SW

36

H/P IN

ECO

93

HP MUTE

1

STK POWER

27

27

PROTECT

27

PROTECT

42

42

FL OFF

43

STBY RELAY

43

93

SCOR

19

SCOR

HP MUTE

93

SQSO

32

SQ-DATA

18

30

SQCK

33

SQ-CLK

WAKE UP

18

DATA

29

29

DATA

35

CD-DATA

IIC-CLK

29

30

18

CLOCK

CLOK

37

CD-CLK

IIC-DATA

30

WAKE UP

SENS

56

SENS

HOLD

57

HOLD

XLT

58

XLT

X-RST

59

XRST

TRAY.SENS

61

DISC-SENS

TBL.L

63

TBL-L

TBL.R

65

TBL-R

UP SW

68

ENC 3/UP-SW

LED

69

ENC 2/DISC-LED

B TRG

72

B-TRG

A TRG

73

A-TRG

CAPM-CNT 2

74

CAPM-CNT 2

CAPM-CNT 1

75

CAPM-CNT 1

CAP-M-H/L

76

CAP-M-H/L

MS OUT

77

AMS IN

LM ON/OFF

78

TC-MUTE

REC/PB/PASS

79

R/PB/PAS

NR ON/OFF

NR-ON/OFF

X501

RM ON/OFF

81

REC-MUTE

32.768kHz

BIAS ON/OFF

82

BIAS

XC-IN

10

NORM/HIGH

83

EQ-H/N

PB A/B

84

PB-A/B

XC-OUT

11

ALC ON/OFF

85

ALC

X502

B PLAY

86

B-PLAY-SW

16MHz

A PLAY

87

A-PLAY-SW

X-OUT

13

A-HALF

88

A-HALF

B-HALF/REC A/REC B

89

B-HALF

X-IN

15

B SHUT

90

B-SHUT

A SHUT

91

A-SHUT

RELAY

100

TC-RELAY

RDS-INT

20

RDS-INT

RDS-DATA

21

RDS-DATA

ST-MUTE

49

ST-MUTE

STEREO

50

STEREO

TUNED

51

TUNED

POWER

2

ST-CE

52

ST-CE

ST-DOUT

53

ST-DOUT

ST-DIN

54

ST-DIN

CD-POWER

5

ST-CLK

55

ST-CLK

• R CH : Same as L ch

			IC931	Q931
				SWITCH
	+UNREG, 17V	1	+10V	3
			REG
				2	Q932
I					SWITCH
					FAN SWITCH
			IC932			Q961, 963
POWER		1	+12V	3
SECTION			REG			IC933
(Page 22, 23)
					1	+7V	3
						REG
J			IC951	Q903
				SWITCH
	UN–12V	2	–7V	3
			REG
DISPLAY
SECTION					Q904
(Page 24)					SWITCH
				DETECTOR
				Q905
			IC901	Q911
				SWITCH
	UN+12V	1	+7V	3
			REG
							(LED+7V)
				2	Q912
					SWITCH
			Q902
			SWITCH
			IC911
		1	+5V	3
			REG
					Q911
					SWITCH		(D+5V SW)
				2	Q912
					SWITCH
			Q914
		SWITCH
			5		Q913
					SWITCH		(CD D+5V SW)
							(CD A+5V SW)

PL A+10V

ST +10V

M901

FAN

TC MOTOR+12V

M+7V (UNSW)

7V

ST A-7V

LED-7V

TC–7V

–7V

ST A+7V

LED+7V

TC+7V

+7

LED 5V

RDS D+5V UNSW

D+5V UNSW

5V

AU D+5V

EVER +5V	L	(Page 22, 23)

POWER

SECTION

D+5V (SW)

A+5V (SW)

21 21

HCD-LX7/LX8

– POWER SECTION – (LX8 model)

MIC AMP	MIC VOLUME	MIC AMP
IC850 (1/2)	RV850	IC850 (2/2)

J801

MIX MIC

MIC-SIG

K

DISPLAY

SECTION

GUITAR AMP

GUITAR LEVEL

GUITAR AMP

(Page 24)

IC852 (2/2)

RV851

IC852 (1/2)

J802

C

MAIN 1

GUITAR

MIC-SIG

SECTION

(Page 20)

J803

MAIN 1

G

DBFB

PHONES

SECTION

(Page 20)

F-RELAY

R-ch

MAIN 2

POWER AMP & VOLUME CONTROL

HP.SW

H

SECTION

IC801

FAN DETECTOR

FAN DET

(Page 21)

D405

TM401

MAIN 1

E

RY401

SECTION

L-CH IN

18

11

L

(Page 20)

FRONT

VOLUME

RELAY

R-CH

R

DRIVER

CONTROL

Q401-402

6

3

4

PROTECT

LATCH

VOLUME

CONTROL

DC AMP

DRIVER

D802, 852

Q433-434

Q432

THERMAL

L-CH THERMAL

LATCH

PROTECT

MAIN 2

L

D804

SENSOR

PROTECT SWITCH

DRIVER

SWITCH

Q831-832

Q801

Q437

Q431

SECTION

EVER +5V

MUTE

TH831

(Page 21)

MUTE

CONTROL

PROTECT

Q834

SW

SWITCH

Q805

HEAD PHONE

Q439

HP-MUTE

MUTE

Q833

MAIN 2

I

POWER

MUTE

MUTE

TRANSFORMER

SECTION

STK-POWER

DRIVE

SWITCH

VF

T951

(Page 21)

Q804

Q803

VF

PROTECT

+UNREG. 12V

RECT

D833-836

EXCEPT MX,AUS

UN +10V

240V

VOLTAGE

RECT

ONLYAUS

SELECTOR

JW969

UN –10V

D841-844

EXCEPT

VS901

MX,AUS

230V

JW971

• R CH : Same as L ch

120V

Q904

Q903

+VH

RECT

AC-L

RECT

MXONLY JW965

F951

JW967

AUS ONLY

• SIGNAL PATH

MX,AUS

VF (–35V)

SWITCH

–35V REG

D831

AC-L

D832

EXCEPT

09

: FM

AC

IN

22 22

HCD-LX7/LX8

– POWER SECTION – (LX7 model)

MAIN 1

SECTION

(Page 20)

MAIN 1

SECTION

(Page 20)

MAIN 2

SECTION

(Page 21)

MAIN 2

SECTION

(Page 21)

G

E

L

I

J801

MIX MIC

J802

GUITAR

DBFB

F-RELAY

L-CH IN

EVER +5V

HP-MUTE

STK-POWER

PROTECT

POWER

ECO

•R CH : Same as L ch

•SIGNAL PATH

09

: FM

MIC AMP	MIC VOLUME	MIC AMP
IC850 (1/2)	RV850	IC850 (2/2)

				K	DISPLAY
			MIC-SIG		SECTION
					(Page 24)
GUITAR AMP	GUITAR LEVEL	GUITAR AMP
IC852 (2/2)	RV851	IC852 (1/2)
				C	MAIN 1
			MIC-SIG		SECTION
					(Page 20)

			J803
				PHONES
	R-ch	MUTE
		SW		H	MAIN 2
	POWER AMP & VOLUME CONTROL	Q805	HP.SW
	IC801				SECTION
		FAN DETECTOR	FAN DET		(Page 21)
		D405	TM401
		RY401
18	11			L

VOLUME

CONTROL

	6	3	4
			VOLUME
			CONTROL
			D802, 852
			THERMAL
D804			SENSOR
			Q831-832
	MUTE		TH831
	CONTROL
	Q834
HEAD PHONE
MUTE
Q833
MUTE	MUTE
DRIVE	SWITCH
Q804	Q803

FRONT

					RELAY			R-CH	R
					DRIVER
					Q401-402
PROTECT			LATCH
DC AMP			DRIVER
Q433-434			Q432
L-CH THERMAL					LATCH		PROTECT
PROTECT SWITCH					DRIVER		SWITCH
Q801					Q437		Q431
					PROTECT
					SWITCH
					Q439

				POWER
				TRANSFORMER
				T951
			+UNREG. 12V	RECT
				D833-836
			UN +10V	RECT
			UN –10V	D841-844
				230V
	+VH	RECT	+VL	JW954
				RECT
	–VH	D831	–VL	D832
				ONLY
				STANDBY
				RELAY CONTROL
				Q901
				SUB-TRANSFORMER
			+5.6V	T901
		+5.6V		RECT
			3 REG 1
				D902-905
			IC901
	VG	–30V REG	POWER	RECT
			SWITCH
		Q903, 908		D907-910
			Q902
		SWITCH		SWITCH
		Q907
				Q904-905
			VF
				VF
				SWITCH
				Q906

STANDBY

RELAY

RY901

AC

IN

23 23

HCD-LX7/LX8

– DISPLAY SECTION –

	(Page20)	F
	MAIN 1 SECTION
					RESET
	MAIN 2 SECTION				DATA
				CLOCK
	(Page	J
				WAKE UP
	21)
	(Page 22, 23)
		K
	POWER SECTION			MIC–SIG
	MAIN 1 SECTION			SPEANA

D

(Page 20)

09

DISPLAY CONTROL

IC601

								REMOTE
						SIRCS	1	CONTROL
								RECIEVE
								IC702
								S701
								JOG	SERIAL
						JOG A	2	. AMS >	PARALLEL
						JOG B	8		CONVERTER
									IC701
						LED SCK	3		14 CLK	P3	1
						LED LATCH	4		15 STB		•
										P5	3
						LED DAT	5		13 DATA	•	5
										P7	•
										•
			70 X IN								7
										P9	11
		X601								P16
											•
		12.5MHz									20
								S691			22
			72 X OUT
						D-SW	80	Z
										P1	17
								OPEN
										•	•
										P2	19
								Q601 – Q603	+5VH
			73 RESET			LED SEL	7	LED POWER
			78 I2C DATA					SWITCH	+5VL
			79 I2C CLK
			22 WAKE UP					S701
						VOLUME A	9	VOLUME
						VOLUME B 10
	REC LEVEL
	OUTPUT
DISPLAY CONTROL (FOR MIC)						KEY 0	11
	IC603							KEY MATRIX
						KEY 4	15
	REC LEVEL 11		21 ALL BAND					Q605 – Q607
3	LINE NF	F06 12	20 BPF 4
						DAILY LED	74	LED DRIVER	D601 – D603
4	LINE IN	F05 13	19 BPF 3
						REC LED	75
6	REC IN	F04 14	18 BPF 2
						LED-EC0	77
5	REC NF	F02 16	17 BPF 1
		F01 17	16 BPF 0					Q608 – Q610
						GR-1	43	DRIVER
						GR-15	28
						GR-16	27
			SEG-1	23	GR-3	14, 2
			45	67	29	40, 42

D604 – D607, D611, D612, D616 – D621,

D623 – D627, D635 – D638

D700

D631, D632, D641

FLUORESCENT INDICATOR TUBE

FL601

VF

24 24