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

CD

SECTION

TAPE DECK

SECTION

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

AEP Model

UK Model

HCD-LX7

E Model

Australian Model

HCD-LX8

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 0 OR 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 —

MODEL PARTS No.

LX7: AEP, UK, CIS model 4-225-529-1
LX8: E, AR model 4-225-529-2
LX8: SP, MY model 4-225-529-3

Parts No.

LX8: MX model 4-225-529-4
LX8: AUS model 4-225-529-5
LX8: EA model 4-225-529-6

• Abbreviation
SP : Singapore model
MX : Mexican model
AUS : Australian model
EA : Saudi Arabia model
AR : Ar gentine model
MY : Malaysia model

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

s
s
s
s
s
s

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 LOOP button and "/1 button simultaneously.

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 po wer 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 simultaneousl y.)

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”v alue increases. Howe ver,

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 FUNCTION button to switch the function to “CD”.

6. Press the three buttons c/CLOCK SET , ENTER , and DISC 4 button simultaneously.

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.

• T ape 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

Front Panel

SECTION 2

GENERAL

1234567 8 9101112 1413 15

16
17
18

74
73

72
71

70
69

68

65 66 67

64

61 62

54 55 56

63

59 60

57 58

52 53

19

20

21

22 23

24

25 26

27 28 29

30 31

32 33

34

51
50

49
48

35

36 37 38

39

40

41424344454647

Photo : HCD-LX8

9

LOCATION OF PARTS AND CONTROLS

1 "/1 (Power) button and indicator
2 c/CLOCK SET button
3 SLEEP button
4 REC button and indicator
5 DAILY button and indicator
6 TUNING - button
7 TUNING + button
8 Display window
9 ENTER/NEXT button and indicator
10 TUNER MEMORY button
11 STEREO/MONO button
12 TUNING MODE button
13 GEQ control button
14 PTY button (LX7 model only)
15 Remote sensor
16 SYNC EQ button
17 SYNC BASS button
18 SURROUND button and indicator
19 KARAOKE PON button
20 FUNCTION button
21 VOLUME knob
22 Z (A Deck) button
23 Z (B Deck) button
24 PHONES jack
25 h (B Deck) button and indicator

26 H (B Deck) button and indicator
27 x (B Deck) button
28 m (B Deck) button
29 M (B Deck) button
30 X (B Deck) button and indicator
31 z REC (B Deck) button and indicator
32 HI-SPEED DUB button
33 CD SYNC button
34 . AMS > knob
35 HX (CD) button and indicator
36 x (CD) button
37 m (CD) button
38 M (CD) button
39 DISK SKIP button
40 VIDEO2 INPUT jacks
41 REPEAT button
42 PLAY MODE button
43 DISC 1 button
44 DISC 2 button
45 DISC 3 button
46 DISC 4 button
47 DISC 5 button
48 EDIT button
49 NON-STOP button and indicator
50 FLASH button

51 LOOP button
52 DIRECTION button
53 DOLBY NR button
54 x (A Deck) button
55 m (A Deck) button
56 M (A Deck) button
57 h (A Deck) button
58 H (A Deck) button
59 MIX MIC jack
60 GUITAR jack
61 MIC LEVEL knob
62 GUITAR LEVEL knob
63 SUPER WOOFER MODE button
64 SUPER WOOFER button and indicator
65 FILE MENU button
66 GEQ CTRL button
67 ENTER button and indicator
68 GROOVE button and indicator
69 Equalizer indicators
70 EFFECT button and indicator
71 TUNER/BAND button
72 SPECTRUM ANALYZER button
73 DISPLAY button
74 DEMO (STANDBY) 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

7Flat type wire(CN304)

6Flat type wire(CN431)

1Screw(BVTP3x8)

qdFront panel

8Flat type wire(CN303)

2Earth wire

9Connector(CN452)

3Connector

(CN802)

0Connector(CN702)

4Screw(BVTP3x8)

5Two earth wirs

qaScrew(BVTP3x8)

3-2. MAIN BOARD

0Back panel

qsFan motor

qsFour screws(BVTP3x8)

4Screw(BVTP3x8)

1Two screws(BVTP3x8)

8Three screws(BVTP3x8)

qaTwo screws(BVTP3x8)

7Two screws(BVTP3x8)
6Two screws(BVTP3x8)

5Seven screws(BVTP3x8)

9Connector(CN903)

qfMain board

3Tuner

2Flat type wire(CN1)

qdTwo screws(BVTP3x8)

11

3-3. SUB PANEL

d

y

)

1Three screws
(BVTP2.6x8)

7Screw
(PTPWH3x10)

2Ornamental
plate

3Connector
(CN812)

8Four screws
(BVTP2.6x8)

Claw

4Connector
(CN703)

5Five screws
(BVTP2.6x8)

9Front input boar

3-4. CD LID ASSEMBLY

2Spring(TC lid)

0Sub panel block

6Screw

(PTPWH3x10)

3-5. TAPE MECHANISM DECK AND CASSETTE LID

qfHolder(deck A)

qdSpring(deck A)

qaSpring(deck B)

9Spring(TC- lid)

3 Sab panel assembly

1CD lid assembl

qsHolder(deck B)

4Mechanism deck

1Two screws(BVTP2.6x8)

2Screw(BVTP2.6x8

7Screw

(BVTP2.6x8)

5Two screws
(BVTP2.6x8)

3Screw(BVTP2.6x8)

12

6Screw(BVTP2.6x8)

0Bracket

8Spring(TC- lid)

3-6. CD MECHANISM DECK 3-7. BASE UNIT

t

1Five screws (BVTP3x8)

2CD mechanism

deck

3Base uni

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.

A

2Screw (BVTP3X8

3Bracket (BU)

4Stop screw

1Screw (BVTP3X8)

5Disc table

A

13

SECTION 4

MECHANICAL ADJUSTMENTS

SECTION 5

ELECTRICAL 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

FWD

FWD
back tension

REV

REV
back tension

FF/REW

FWD tension

REV tension

Torque meter

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

Meter reading

3.04 – 6.96 N • m
(31 to 71 g • cm)

(0.43 – 0.98 oz • inch)

0.20 – 0.58 N • m

(2 to 6 g • cm)

(0.02 – 0.08 oz • inch)

3.04 – 6.96 N • m
(31 to 71 g • cm)

(0.43 – 0.98 oz • inch)

0.20 – 0.58 N • m

(2 to 6 g • cm)

(0.02 – 0.08 oz • inch)

6.97 – 14.02 N • m
(71 to 143 g • cm)

(0.98 – 1.99 oz • inch)

0.98 N • m or more

(100 g or more)

(3.53 oz or more)

0.98 N • m or more

(100 g or more)

(3.53 oz or more)

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.

Signal

P-4-A100

WS-48B

P-4-L300

10 kHz, –10 dB

3 kHz, 0 dB

315 Hz, 0 dB

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)

set

MD OUT

Used forTape

Azimuth Adjustment

Tape Speed Adjustment

Level Adjustment

level meter

+

–

2. Turn the adjustment scre w 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
peak

screw
position

R-CH
peak

output
level

within
1 dB

L-CH
peak

R-CH
peak

within 1dB

screw
position

14

3. Mode: Playback Tape Speed Adjustment (Deck A)

)

test tape
P-4-A100
(10kHz, –10dB)

set

main board
CN301
Pin 3 (L-ch)

Pin 2 (GND)

L

R

oscilloscope

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

Pin 1 (R-ch)

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

Waveform of oscilloscope

in phase 45°

good

90°

135°

180°

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

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)

set

main board
CN301
Pin 1 (R-ch)
Pin 3 (L-ch)

level meter

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)

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

1) 315 Hz

2) 10 kHz

AF OSC

attenuator

600 Ω

} 50 mV (–23.8 dB)

blank tape
CS-123

set

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

600 Ω

attenuator

set

blank tape
CS-123

4. Mode: Playback

recorded
position

set

main board
CN301
Pin 1 (R-ch)
Pin 3 (L-ch)

level meter

5. Confirm playback the signal recorded in step 2 become adjust­ment level as follows.
If these levels do not adjustment lev el, adjust the R V341 (L-CH)
and R V441 (R-CH) on the A UDIO board to repeat steps 3 and 4.

Adjustment level: The playback output of 10 kHz le vel dif ference

against 315 Hz reference should be ± 1.0 dB.

Adjustment Location: AUDIO board

Adjustment Location:

[AUDIO BOARD] (Conductor Side)

RV341(Lch),RV441(Rch)
Record Bias

RV311(Lch),RV411(Rch)
Playback Level (Deck A)

4. Mode: Playback

recorded
position

set

main board
CN301
Pin 1 (R-ch)
Pin 3 (L-ch)

level meter

5. Confirm playback the signal recorded in step 2 become adjust­ment level as follows.
If these levels do not adjustment lev el, adjust the R V301 (L-CH)
and R V351 (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

[MAIN BOARD] (Conductor Side)

RV301 RV401

16

RV441 RV341

RV301(Lch),RV401(Rch)
Playback Level (Deck B)

RV311

RV411

Record Level (Lch)

CN301

3
1

IC301

RV351
Record Level (Rch)

RV301

43

42

29

56

28

1

15

14

SECTION 6

BD board

MIC board

TC-A board

TC-B board

PANEL-FL board

PANEL-VR board

HEADPHONE board

LED board

CD MOTOR board

TABLE SENSOR board

TUNER UNIT

TRANS board

MAIN board

FRONT INPUT board

CD-R board

CD-L board

PA board

AUDIO board

LEAF SW board

SUB TRANS board (LX7)

DIAGRAMS

HCD-LX7/LX8

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

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

oscilloscope

+
–

symmetry

A

Within 3 ± 1 Vp-p

B

E-F Balance (1 Track Jump) check

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

0V

level : 1.3 ± 0.6 Vp-p

Center of the waveform

B

A (DC voitage)

Symmetry

Adjustment Location :

[ BD BOARD ] — SIDE A —

6-1. CIRCUIT BOARDS LOCATION

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.

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

RF Level Check

BD board

TP (RF)
TP (VC)

oscilloscope

+

–

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

TP
(VC)

TP
(RF)

TP
(AGCCON)

TP (FE)

TP
(TE)

TP
(FE1)

17

17

HCD-LX7/LX8

6-2. BLOCK DIAGRAMS

– BD (CD) SECTION –

OPTICAL PICK-UP BLOCK

(KSS-213B/K-N)

DETECTOR

E

ABC

D

F

FD

PD

TRACKING

COIL

FOCUS

COIL

• SIGNAL PATH
: CD
: Digital out

09

LASER
DIODE

LD

POWER

MOTOR

SPINDLE

MOTOR

M102

SLED

M101

IC101

DIGITAL SERVO

DIGITAL SIGNAL PROCESSOR

RF AC

51

ASY1

ASYMMETRY
CORRECTION

ASY0

48

VC

38

CE

42

RFDC

43

FE
TE

SE

CE

TFDR
TRDR

FFDR
FRDR

SRDR
SFDR

MDP

OPERATIONAL

AMPLIFIER

ANALOG
SWITCH

PWM

GENERATOR

TRACKING

PWM

GENERATOR

FOCUS

PWM

GENERATOR

SLED
PWM

GENERATOR

DIGITAL

CLV

39
41

40

42

30
31

32
33

29
28

26

DIGITAL

PLL

A/D

CONVERTER

SERVO DSP

TRACKING

SERVO

FOCUS
SERVO

SLED

SERVO

16K

RAM

EFM

DEMODULATION

SUBCODE

PROCESSOR

SERIAL IN

INTERFACE

OVER SAMPLING

DIGITAL FILTER

3rd ORDER

NOISE SHAPER

PWM PWM

DATA BUS

ERROR

CORRECTOR

D/A

INTERFACE

SERVO

AUTO

SEQUENCER

APCLD/PD

MUTE

SUMMING

TRACKING

AMP

5
6

2
3

23
24

25
27

20

IC103

RF AMP

RF

AMP

FOCUS
ERROR

AMP

ERROR

AMP

TFDR
TRDR

FFDR
FRDR

SRDR
SFDR

BUFFER

HOLD SW

VC

VC

RF EQ

AMP

RF

16

FF

14 49

TE

13

12

VC

LDON

22

REF

1521

INTEG­RATOR

INTEG­RATOR

VC

VCC
VC

A

C
D
B

E

F

LD

DRIVE

Q101

T+

T–

F+

F–

SD+

M

SD–

SP+

M

SP–

A

5

C

7

D

8

B

6

E

11

F

10

LD

3

PD

4

VREF

CH2OUTR

CH2OUTF

CH1OUTF

CH1OUTR

CH3OUTF

CH3OUTR

CH4OUTF

CH4OUTR

IC102

CH2FIN

CH2RIN

CH1FIN

CH1RIN

CH3RIN

CH3FIN

CH4SIN
CH4BIN

FOCUS/TRACKING COIL DRIVE
SPINDLE/SLED MOTOR DRIVE

11

12

14

13

17

18

15

16

DIGITAL

INTERFACE

SERVO

INTERFACE

S201

(UP SWITCH)

M201

TABLE

MOTOR

TIMING

LOGIC

CPU

M

OUT

XTA1

STAO

D OUT

XRST
SQSO
SQCK

SENS

DATA

XLAT

CLOK

SCOR
XLON

SCLK
SSTP

RMUT

LMUT

LMUT

AIN1

LOUT1

LOUT2

AIN2

LOUT2

DISC

SENSOR

IC202

IC201

MOTOR DRIVER

OUT 2

3

OUT 1

7

66

67

60

3
1
2

8

5
6

7

20
14

9

27

79

80

70

71

72

77

76

75

LIMIT SW

IN 2

IN 1

S101

1

9

X101

16.9344MHz

DOUT

XRST
SQSO

SENS

DATA
XLT

CLOK

SCOR

SQCK
+5V

L OUT

HOLD

R-CH

TRAY SENS

UP SW

TBL-R

TBL-L

A

MAIN

SECTION

(Page 20, 21)

18

18

+5V

D201

(DISC No.)

LED SW

Q201

LED

– DECK SECTION –

HCD-LX7/LX8

HP101
PB HEAD
(DECK A)

REC/PB HEAD

(DECK B)

HRPE101

ERASE HEAD

PB A/B

MS OUT

TC PB L

LM ON/OFF

NORM/HIGH

NR ON/OFF

REC/PB/PASS

TC REC L

BIAS ON/OFF
RM ON/OFF

ALC ON/OFF

RELAY

CAPM CNT1

CAPM CNT2

CAP M H / L

A SHUT

B

MAIN

SECTION

(Page 20, 21)

17

2

DOLBY NR

RECOUT

D

32

S1008
B CrO

2

19

B NORM/CROM/

METAL

PAS

DOL

BIAS SW

M

31, 33

M1

CAPSTAN

MOTOR

DOLBY
TYPE B

CN301

3

R CH

28

27

M

MS

26

PB OUT

LM ON/

OFF

NORM/

HIGH

NR ON/

OFF

PB

LIN

BIAS ON/OFF

RM ON/OFF

ALC ON/OFF

CAP MOTOR
CONTROL
Q336-343

CONTROL

RV1002

NORMAL

SPEED

SPEED

Q1001

40

25

18

23

24

43

20
22
15

RV1001

HIGH

SPEED

1

SWITCH

Q335

REEL

DETECT

IC1001

S1004
A CrO

RV311

4

PLAYBACK

LEVEL

DECK A

RV301

PLAYBACK

LEVEL

DECK B

RV341

REC
BIAS

REC BIAS

BIAS OSC

T621, Q621, 622

IC611

L

R

L

R

X

R CH

R CH

3

P

ERASE BIAS

IC601

1

IC602

R

REC/PB

16

PB-A/B

A IN

48

B IN

46

RV301

REC LEVEL

+7.5V

Q623

EQIN

38

EQOUT

36

70

120

DOLBY NR
IC301

A 120/70

39

REEL

DETECT

IC1002

S1001 (A PLAY)

• R CH : Same as L ch

• SIGNAL PATH

+5V

S1002 (B PLAY)

: PB (DECK A)
: PB (DECK B)
: REC (DECK B)

09

• PLUNGER SOLENOID is supplied
as the MECHANICAL BLOCK ASSY.

A DECK/
B DECK
PLUNGER

TRIGGER
MOTOR
CONTROL
Q331-334

S1003

(A HALF)

S1005

(REC A)

S1006

(B HALF)

S1009

(REC B)

+5V

+5V

B SHUT

A PLAY

B PLAY

A HALF

B HALF/REC A/REC B

B TRIG

A TRIG

19

19

HCD-LX7/LX8

– MAIN (1/2) SECTION –

FM/AM TUNER
TUNER UNIT IS
SUPPLED AS THE
ASSEMBLED
BLOCK

DECK

SECTION

(Page 19)

CD

SECTION

(Page 18)

POWER

SECTION

(Page 22,

B

A

C

23)

DIGITAL

VIDEO 2

IN

VIDEO

IN

PHONO

(L IN)

MD (L IN)

V1, AU

(L IN)

V2, AU,

L-CH IN

CD

OUT

J804

J702

J701

ST-L

TC PB L

D OUT

CD-L

J701

MIC-SIG

J701

J804

IC781

OPTICAL

TRANSMITTING

D OUT

IC191

AV SWITCH

6

IN3

IN1

1

B

A

2 3 5

46 45 28

IC181 SELECTOR

12

X0

X1

14

A

10 9

46 45

X

B

VD OUT

13

J702

SPEANA

J701

L-CH SIG

TC REC L

VIDEO

OUT

MD OUT

D

E

(Page 22, 23)

B

DISPLAY

SECTION

(Page 24)

POWER
SECTION

DECK

SECTION

(Page 19)

10

IC101

C

IC601

PHONO AMP

3

EXCEPT

LX7/LX8:MX

JW704

1

SOUND PROCESSOR 1

69

IN A2

IN B2

68

IN C2

67

IN D2

66

65

IN E2

MIC IN

2

64

IN F2

33 3234

L+R

REC B2

BUS OUT2

REC A2

BBA2

BBB2

BUF IN2

CLOCKDATALATCH

30

57

36

SWITCH

Q111

TC REC L

SWITCH

Q112

7

58

39

38

37

SWITCH

Q115

34

484738

MUTE

SWITCH

Q113

• R CH: Same as L ch

• SIGNAL PATH

: FM
: CD
: PB
: REC
: VIDEO/MD
: Digital out

09

LX7/LX8:MX ONLY

J705

CD

(LIN)

J805

CD

(L OUT)

MUTE

SWITCH

Q803

D807

RESET

SWITCH

Q802

MUTE

SWITCH

Q804

6

3

LINE-MUTE

F-RELAY

MAIN CONTROL

IC501 (1/2)

FUNC-SEL1

RESET

12

RESET

SWITCH

Q801

RESET
IC801

DBFB-H/L

V-MUTE

SW-MODE

493-LAT

493-DATA

D805

28
34
38

45
46FUNC-SEL0
47
48493-MUTE

22AC-CUT

+5v

7

7

28
34
38

45
46
47
48

DISPLAY

RESET

DBFB

F-RELAY

G

F

(Page 24)

(Page 22, 23)

SECTION

POWER

SECTION

20

20

– MAIN (2/2) SECTION –

HCD-LX7/LX8

H

POWER

SECTION

(Page 22,

A

BD (CD)

SECTION

(Page 18)

B

DECK

SECTION

(Page 19)

FM/AM TUNER
TUNER UNIT IS
SUPPLED AS THE
ASSEMBLED
BLOCK

23)

B-HALF/REC A/REC B

FAN DET

HP.SW

SCOR

SQSO

SQCK
DATA
CLOK
SENS

HOLD

XLT

X-RST

TRAY.SENS

TBL.L
TBL.R

UP SW

LED

B TRG
A TRG

CAPM-CNT 2

CAPM-CNT 1

CAP-M-H/L

MS OUT

LM ON/OFF

REC/PB/PASS

NR ON/OFF

RM ON/OFF
BIAS ON/OFF
NORM/HIGH

PB A/B

ALC ON/OFF

B PLAY
A PLAY
A-HALF

B SHUT
A SHUT

RELAY

RDS-INT

RDS-DATA

ST-MUTE

STEREO

TUNED

ST-CE

ST-DOUT

ST-DIN

ST-CLK

36 H/P IN

SCOR

19

SQ-DATA

32

SQ-CLK

33

CD-DATA

35

CD-CLK

37

SENS

56

HOLD

57

XLT

58

XRST

59

61

DISC-SENS

63

TBL-L

65

TBL-R

68

ENC 3/UP-SW
ENC 2/DISC-LED

69

72

B-TRG

73

A-TRG

74

CAPM-CNT 2

75

CAPM-CNT 1

76

CAP-M-H/L

77

AMS IN

78

TC-MUTE

79

R/PB/PAS

80

NR-ON/OFF
REC-MUTE

81
82

BIAS

83

EQ-H/N

84

PB-A/B
ALC

85
86

B-PLAY-SW

87

A-PLAY-SW

88

A-HALF

89

B-HALF

90

B-SHUT

91

A-SHUT
TC-RELAY

100

20

RDS-INT

21

RDS-DATA

49

ST-MUTE

50

STEREO

51

TUNED

52

ST-CE

53

ST-DOUT

54

ST-DIN

55

ST-CLK

MAIN CONTROL

IC501 (2/2)

STK-POWER

STBY RELAY

PROTECT

FL OFF

HP MUTE

WAKE UP

IIC-CLK

IIC-DATA

XC-IN

XC-OUT

X-OUT

X-IN

POWER

CD-POWER

1

27

42
43
93

18
29
30

32.768kHz

10

11

13

15

2

5

1

27

42
43
93

18
29
30

X501

X502

16MHz

43
42
93

1

27

30
29
18

LX7

POWER
ECO
HP MUTE

STK POWER
PROTECT

DATA

CLOCK

WAKE UP

I

POWER

SECTION

(Page 22, 23)

J

DISPLAY
SECTION

(Page 24)

+UNREG, 17V

UN–12V

UN+12V

IC931

+10V

1 3

REG

IC932

+12V

1 3

REG

IC951

–7V

2 3

REG

IC901

+7V

1 3

REG

Q902
SWITCH

IC911

+5V

1 3

REG

Q914

SWITCH

5

DETECTOR

Q905

SWITCH

2

SWITCH

SWITCH

2

Q931

Q903

Q911

Q932
SWITCH

Q904
SWITCH

Q912
SWITCH

SWITCH

2

SWITCH

Q911

Q913

FAN SWITCH

Q961, 963

IC933

+7V

1 3

REG

Q912
SWITCH

(LED+7V)

(D+5V SW)

(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

D+5V (SW)

A+5V (SW)

L

POWER

SECTION

(Page 22, 23)

09

• R CH : Same as L ch

21

21

HCD-LX7/LX8

– POWER SECTION – (LX8 model)

MAIN 1

SECTION

(Page 20)

MAIN 1

SECTION

(Page 20)

MAIN 2

SECTION

(Page 21)

G

E

L

MIX MIC

GUITAR

J801

J802

DBFB

F-RELAY

L-CH IN

EVER +5V

HP-MUTE

POWER AMP & VOLUME CONTROL

18

D804

HEAD PHONE

MUTE
Q833

IC801

VOLUME

CONTROL

6

MUTE

CONTROL

Q834

MIC AMP

IC850 (1/2)

GUITAR AMP

IC852 (2/2)

11

4

3

TH831

VOLUME
CONTROL
D802, 852

THERMAL

SENSOR
Q831-832

MIC VOLUME

RV850

GUITAR LEVEL

RV851

R-ch

PROTECT

DC AMP

Q433-434

L-CH THERMAL

PROTECT SWITCH

Q801

MIC AMP

IC850 (2/2)

GUITAR AMP

IC852 (1/2)

LATCH

DRIVER

Q432

RELAY

DRIVER

Q401-402

LATCH

DRIVER

Q437

PROTECT

SWITCH

Q439

RY401

PROTECT

SWITCH

Q431

MUTE

SW

Q805

FAN DETECTOR

D405

R-CH

MIC-SIG

MIC-SIG

J803

HP.SW

FAN DET

TM401

PHONES

L

R

FRONT

K

C

H

DISPLAY

SECTION

(Page 24)

MAIN 1

SECTION

(Page 20)

MAIN 2

SECTION

(Page 21)

MAIN 2
SECTION

(Page 21)

09

I

STK-POWER

• R CH : Same as L ch

• SIGNAL PATH

: FM

PROTECT

MUTE

DRIVE

Q804

MUTE

SWITCH

Q803

VF (–35V)

SWITCH

Q904

–35V REG

Q903

+VH

RECT
D831

+UNREG. 12V

UN +10V

UN –10V

AC-L

AC-L

RECT

D833-836

RECT

D841-844

RECT
D832

VF

VF

POWER

TRANSFORMER

T951

240V

230V

120V

MX ONLY

EXCEPT

MX,AUS

JW971

JW965

F951

EXCEPT
MX,AUS

JW969

AUS ONLY

EXCEPT MX,AUS

VOLTAGE

SELECTOR

AUS

JW967

ONLY

VS901

AC

IN

22

22

– POWER SECTION – (LX7 model)

HCD-LX7/LX8

MAIN 1

SECTION

(Page 20)

MAIN 1
SECTION

(Page 20)

MAIN 2

SECTION

(Page 21)

G

E

L

MIX MIC

GUITAR

J801

J802

DBFB

F-RELAY

L-CH IN

EVER +5V

HP-MUTE

STK-POWER

PROTECT

POWER AMP & VOLUME CONTROL

18

D804

HEAD PHONE

MUTE

Q833

MUTE
DRIVE

Q804

IC801

VOLUME

CONTROL

6

MUTE

CONTROL

Q834

MUTE

SWITCH

Q803

VOLUME
CONTROL
D802, 852

THERMAL

SENSOR

Q831-832

MIC VOLUME

RV850

GUITAR LEVEL

RV851

PROTECT

DC AMP

Q433-434

L-CH THERMAL

PROTECT SWITCH

Q801

MIC AMP

IC850 (2/2)

GUITAR AMP

IC852 (1/2)

R-ch

LATCH

DRIVER

Q432

RELAY

DRIVER

Q401-402

LATCH

DRIVER

Q437

PROTECT

SWITCH

Q439

+VH
–VH

RY401

PROTECT

SWITCH

Q431

RECT
D831

MUTE

SW

Q805

+UNREG. 12V

UN +10V

UN –10V

FAN DETECTOR

+VL

–VL

D405

R-CH

RECT

D833-836

RECT

D841-844

RECT
D832

MIC-SIG

MIC-SIG

J803

HP.SW

FAN DET

TM401

PHONES

L

FRONT

R

POWER

TRANSFORMER

T951

K

C

H

DISPLAY

SECTION

(Page 24)

MAIN 1

SECTION

(Page 20)

MAIN 2

SECTION

(Page 21)

230V

JW954

MIC AMP

IC850 (1/2)

GUITAR AMP

IC852 (2/2)

11

4

3

TH831

MAIN 2
SECTION

(Page 21)

09

I

• R CH : Same as L ch

• SIGNAL PATH

: FM

POWER

ECO

23

23

ONLY

STANDBY

RELAY CONTROL

Q901

SUB-TRANSFORMER

T901

+5.6V

VG

–30V REG
Q903, 908

SWITCH

Q907

3

+5.6V

REG

IC901

POWER

SWITCH

Q902

1

VF

RECT

D902-905

RECT

D907-910

SWITCH

Q904-905

SWITCH

Q906

VF

STANDBY

RELAY
RY901

AC

IN

HCD-LX7/LX8

– DISPLAY SECTION –

(Page

F

20)

MAIN 1 SECTION

MAIN 2 SECTION

(Page

J

21)

(Page 22, 23)

K

POWER SECTION

MAIN 1 SECTION

D

(Page 20)

RESET

DATA

CLOCK

WAKE UP

MIC–SIG

SPEANA

12.5MHz

REC LEVEL

OUTPUT

DISPLAY CONTROL (FOR MIC)

3
4
6
5

LINE NF
LINE IN
REC IN
REC NF

IC603

REC LEVEL

F06
F05
F04
F02
F01

X601

11
12
13
14
16
17

70

72

73
78
79
22

21
20
19
18
17
16

X IN

X OUT

RESET

2

C DATA

I

2

C CLK

I
WAKE UP

ALL BAND
BPF 4
BPF 3
BPF 2
BPF 1
BPF 0

SEG-1

45 67

DISPLAY CONTROL

IC601

23

GR-3 14, 2

29VF40, 42

SIRCS

JOG A
JOG B

LED SCK

LED LATCH

LED DAT

D-SW

LED SEL

VOLUME A
VOLUME B

KEY 0

KEY 4

DAILY LED

REC LED
LED-EC0

GR-1
GR-15
GR-16

REMOTE

1

2
8

3
4
5

80

7

9

10

11

15

74
75
77

43
28
27

CONTROL

RECIEVE

IC702

S701

JOG

. AMS >

S691

Z

OPEN

Q601 – Q603

LED POWER

SWITCH

S701

VOLUME

KEY MATRIX

Q605 – Q607
LED DRIVER

Q608 – Q610

DRIVER

14

CLK

15

STB

13

DATA

D601 – D603

SERIAL

PARALLEL

CONVERTER

IC701

+5VH

+5VL

D604 – D607, D611, D612, D616 – D621,
D623 – D627, D635 – D638

1

P3

•

3

P5

•

5

P7

•

•

7

P9

P16

P1
P2

11

•

20
22

17

•

•

19

D700

D631, D632, D641

FLUORESCENT INDICATOR TUBE

09

FL601

24

24