Panasonic MS SA-AK18 Schematic

ORDER NO. MD0004055C3

CD Stereo System

SA-AK18

Colour
(S)... Silver Type

Area
(GC)...Asia, Latin America, Africa and Middle Near East
(GN)...Oceania

TAPE SECTION :
AR2 MECHANISM SERIES
CD SECTION :
RAE0152Z-3 TRAVERSE DECK SERIES

Specifications

■ AMPLIFIER SECTION (GC area)

PMPO 1400 W
RMS power output
THD 10%, both channels driven 70 W per channel (6 Ω)
Input sensitivity
AUX 250 mV
MIC 0.7 mV
Input Impedance
AUX 13.9 kΩ
MIC 680 Ω

■ AMPLIFIER SECTION (GN area)

RMS power output
THD 10%, both channels driven 60 W per channel (6 Ω)
Input sensitivity
AUX 250 mV
Input Impedance
AUX 13.9 kΩ

■ FM TUNER SECTION

Frequency range 87.5 - 108 MHz (50 kHz steps)
Sensitivity 2.5 µV (IHF)
S/N 26 dB 2.2 µV
Antenna terminal(s) 75 Ω (unbalanced)

■ AM TUNER SECTION (GC area)

Frequency range
MW 522 - 1629 kHz (9 kHz steps)

520 - 1630 kHz (10 kHz steps)

SW 3.200 - 7.350 MHz (0.005 MHz

steps)

9.400 - 21.750 MHz (0.005 MHz

steps)
Sensitivity
MW
S/N 20 dB (at 999 kHz) 560 µV/m
SW
S/N 20 dB (at 5.3 MHz) 35.5 µV/m

■ AM TUNER SECTION (GN area)

Frequency range 522 - 1629 kHz (9 kHz steps)
Sensitivity
S/N 20 dB (at 999 kHz) 560 µV/m

■ CASSETTE DECK SECTION

Track system 4 track, 2 channel
Heads
Record/playback Solid permalloy head
Erasure Double gap ferrite head
Motor DC servo motor

© 2000 Matsushita Electronics (S) Pte Ltd. All rights
reserved. Unauthorized copying and distribution is a
violation of law.

SA-AK18

Recording system AC bias 100 kHz
Erasing system AC erase 100 kHz
Tape speed 4.8 cm/s
Frequency response (+3 dB, -6 dB at DECK OUT)
NORMAL (TYPE I) 35 Hz - 14 kHz
HIGH (TYPE II) 35 Hz - 14 kHz
S/N 50 dB (A weighted)
Wow and flutter 0.18% (WRMS)
Fast forward and rewind time Approx. 120 seconds with

C-60 cassette tape

■ CD SECTION

Sampling frequency 44.1 kHz
Decoding 16 bit linear
Beam source/wave length Semiconductor laser/780 nm
Number of channels Stereo
Frequency response 20 Hz - 20 kHz (+1, -2 dB)
Wow and flutter Below measurable limit
Digital filter 8fs
D/A converter MASH (1 bit DAC)

■ GENERAL (GC area)

Power supply AC 110 V/127 V/220 V/230-240V,

Power consumption 155 W

50/60 Hz

Power consumption in standby mode
Eco mode on 0.8 W
Eco mode off 12 W
Dimensions (W x H x D) 270 x 330 x 310 mm
Weight 7.4 kg

■ GENERAL (GN area)

Power supply AC 230-240V, 50 Hz
Power consumption 152 W
Power consumption in standby mode
Eco mode on 0.4 W
Eco mode off 12 W
Dimensions (W x H x D) 270 x 330 x 310 mm
Weight 6.9 kg

■ SYSTEM

SC-AK18 (GC) Music Center: SA-AK18 (GC)

Speaker: SB-AK18 (GC)

SC-AK18 (GN) Music Center: SA-AK18 (GN)

Speaker: SB-AK18 (GC)

Notes:

1. Specifiacations are subject to change without notice. Weight and
dimensions are approximate.

2. Total harmonic distortion is measured by the digital spectrum
analyzer.

CONTENTS

Page Page

1 Before Repair and Adjustment
2 Protection Circuitry
3 Accessories
4 Handling Precautions For Traverse Deck
5 Precaution of Laser Diode
6 Operation Procedures
7 Operation Checks and Main Component Replacement

Procedures 8
8 Self-Diagnostic Function
9 Description of Error Code

3

10 CD Test Mode Function

3

11 Measurem ents and Adjustments
12 Illustration of IC’s, Transistors and Diodes

3
4

13 Terminal Function of ICs
14 Block Diagram

4
6

15 Schematic Diagram
16 Printed Circuit Board
17 Wiring Connection Diagram
18 Troubleshooting Guide

15
16

19 Parts Location and Replacement Parts List

17
17
21
22
25
33
60
73
74
75

2

1 Before Repair and Adjustment

Disconnect AC power, discharge Power Supply Capacitors C536, C545, C546, C548 and C555 through a 10 Ω, 5W resistor to
ground.

DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.

For GC

Current consumption at AC 110 V, 240 V, 50 Hz in NO SIGNAL mode should be ~620mA ,~300mA respectively.

For GN

Current consumption at AC 240 V, 50 Hz in NO SIGNAL mode should be ~200mA.

2 Protection Circuitry

The protection circuitry may have operated if either of the following conditions are noticed:

• No sound is heard when the power is turned on.

• Sound stops during a performance.

The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:

1. Turn off the power.

2. Determine the cause of the problem and correct it.

3. Turn on the power once again after one minute.

Note:

When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.

SA-AK18

3 Accessories

Remote Control Transmitter

FM indoor antenna

AC mains lead (GC)

Power plug adapter (GC)

AM Loop antenna

AC mains lead (GN)

3

SA-AK18

4 Handling Precautions For Traverse Deck

The laser diode in the traverse deck (optical pickup) may break
down due to potential difference caused by static electricity of
clothes or human body.

So, be careful of electrostatic breakdown during repair of the
traverse deck (optical pickup).

● Handling of traverse deck (optical pickup)

1. Do not subject the traverse deck (optical pickup) to
static electricity as it is extremely sensitive to electrical
shock.

2. The short land between the No.4 (LD) and No.5 (GND)
pins on the flexible board (FFC) is shorted with a solder
build-up to prevent damage to the laser diode.

To connect to the PC board, be sure to open by
removing the solder build-up, and finish the work
quickly.

3. Take care not to apply excessive stress to the flexible
board (FFC board).

4. Do not turn the variable resistor (laser power
adjustment). It has already been adjusted.

● Grounding for electrostatic breakdown prevention

1. Human body grounding
Use the anti-static wrist strap to discharge the static

electricity from your body.

2. Work table grounding
Put a conductive material (sheet) or steel sheet on the

area where the traverse deck (optical pickup) is placed,
and ground the sheet.

Caution :

The static electricity of your clothes will not be grounded
through the wrist strap. So, take care not to let your
clothes touch the traverse deck (optical pickup).

Caution when Replacing the Traverse Deck :

The traverse deck has a short point shorted with solder to
protect the laser diodeagainst electrostatics breakdown.Be
sure to remove the solder from the short point before
making connections.

5 Precaution of Laser Diode

Caution :

This product utilizes a laser diode with the unit turned "ON", invisible laser radiation is emitted from the pick up lens.
Wavelength : 780 nm
Maximum output radiation power from pick up : 100 µW/VDE
Laser radiation from pick up unit is safety level, but be sure the followings:

1. Do not disassemble the optical pick up unit, since radiation from exposed laser diode is dangerous.

2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.

3. Do not look at the focus lens using optical instruments.

4. Recommend not to look at pick up lens for a long time.

ACHTUNG :

Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Laserstrahlung von der Lasereinheit
abgestrahlt.
Wellenlänge : 780nm

4

Maximale Strahlungsleistung der Lasereinheit :100W/VDE
Die Strahlung an der Lasereinheit ist ungefährlich, wenn folgende Punkte beachtet werden:

1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten Laserdiode gefährlich ist.

2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.

3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.

4. Nicht über längere Zeit in die Fokussierlinse blicken.

ADVARSEL: I dette a apparat anvendes laser.

CAUTION!

THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.

■ Use of Caution Labels

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5

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6 Operation Procedures

6

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7

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7 Operation Checks and Main Component Replacement

Procedures

“ATTENTION SERVICER”

Some chassis components may have sharp edges.
Be careful when disassembling and servicing.

1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the

main components.

2. For reassembly after operation checks or replacement, reverse the respective procedures.

Special reassembly procedures are described only when required.

3. Select items from the following index when checks or replacement are required.
Contents

• Checking Procedure for each major P.C.B.

1. Checking of the Main, Panel, Deck and Power P.C.B.

• Main Component Replacement Procedures

1. Replacement of the Traverse Deck.

2. Replacement of the Power Amplifier IC.

• Disassembly and assembly of the Traverse Unit

• Disassembly and assembly of the Disc Tray

Warning:

This product uses a laser diode. Refer to caution statement “Precaution of Laser Diode.

ACHTUNG:

• Die Lasereinheit nicht zerlegen.

• Die Lasereinheit darf nur gegen eine vom Hersteller speczifizierte Einheit ausgetauscht werden.

7.1. Checking Procedure for each major P.C.B.

7.1.1. Checking of the Main, Panel, Deck
and Power P.C.B.

Step 1 Remove the Top Cabinet.
Step 2 Push the lever in the direction of the arrow.

Step 3 Pull out the CD tray as shown and remove the CD lid.

Push back the CD tray after the CD lid has been removed.

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SA-AK18

Step 5 Remove the wire at CP605 and CN309.

Step 6 Release the 2 catches and remove the CD changer

base together with the CD changer.

• Checking for Main, Panel and Deck P.C.B

• Checking for Power P.C.B.

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SA-AK18

7.2. Main Component Replacement Procedures

7.2.1. Replacement of the Traverse Deck

Step 1

Unit’ (

Follow the procedures in ‘Disassembly of the Traverse

Step 1 - Step 4

).

Note:
Insert a short pin into the flexible cable for traverse unit.

Installation of the CD servo P.C.B. after replacement

•

Step 1
Step 2

assembly.

Connect the FFC board.

Install the CD servo P.C.B. in the traverse deck

Step 3

Servo P.C.B.

Step 4

the 3 pins. Then remove the Traverse Deck.

Desolder the 4 legs of the 2 motors and pull out the

Widen the 3 bosses with a flat screwdriver and pull out

Note:
Before installing the CD servo P.C.B., move the optical pickup

towards the outer edge from the marking (black triangle).
[Otherwise, the reset detect switch (S701) mounted on the CD

servo P.C.B. may be damaged.]

Step 5

• Removal of the flexible cable. Push the top of the connector

Remove the flexible cable CN701.

in the direction of the arrow 1, and then pull out the flexible
cable in the direction of the arrow 2.

10

7.2.2. Replacement of the Power
Amplifier IC

Step 1

Follow the procedures in ‘Checking Procedure for each

major P.C.B.’ (

Step 1 - Step 6

).

Step 6

the respective component.

Unsolder the terminals of Power Amp IC and replace

SA-AK18

Step 4

pull out the Main PCB.

Step 5

Remove the wires at CN302, CN303 and CN304 and

Remove the 4 screws fixed to the Power Amplifier IC.

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7.3. Disassembly and assembly of the Traverse Unit

Step 1 Push the lever from position A to B.
Step 2 Pull the stopper (black) in the direction of arrow 1 and

push the lever in the direction of arrow 2.
Step 3 Push the stopper (black) down until the white lever eject

out.

Step 3 Pull the stopper in the direction of arrow 1 and release
the lever in the direction of arrow 2 as shown.

Step 4 Lift up the traverse unit and slide out the unit as shown.

• Replacement of Traverse Unit
Step 1 Place the traverse unit as shown.
Step 2 Press in the lever shaft in the direction of arrow 1 as

shown and push the traverse unit into the position in the
direction of arrow 2.

Step 4 Pull out the tray half way and push it back fully.

Step 5 Push the lever to the initial position indicated ‘|---|’.

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7.4. Disassembly and assembly of the Disc Tray

Step 5 Rotate the hexagonal wrench in the direction of arrow

(clockwise), and then open the disc tray fully.

Step 2 With lifting the claw in the direction of arrow 1, draw the
clamp SW P.C.B. in the direction of arrow 2.

Step 3 Remove the mechanism cover.

SA-AK18

Step 4 Insert the gear with hexagonal wrench into the hole.

Step 6 Upset the CD changer unit again.
Step 7 Release both the claws, and then draw the disc tray.

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Step 8 With forcing the left guide bar manually because the left

guide bar interferes with claw, draw the disc tray.

• Installation of the disc tray after replacement

Step 1 Slide the drive rack fully in the direction of the arrow.

Step 3 Align the drive rack with the drive gear.

Step 4 Holding the disc tray manually, rotate the pulley gear in

the direction of arrow.
Step 5 Rotate the gear 5 or 6 times manually, and then push

the disc tray.

Step 2 Holding the drive rack, not to move, install the disc tray.

14

8 Self-Diagnostic Function

8.1. Self-diagnostic display

This unit is equipped with a self-diagnostic display function which, if a problem occurs, will display an error code corresponding to
the problem.

Use this function when performing maintenance on the unit.

8.2. How to enter the Self-Diagnostic Function

SA-AK18

8.3. Cassette Mechanism Test (For error code H01, H02, H03, F01, F02)

1. Press “TAPE, DECK 1/2” to select Deck 2.

2. Load a cassette tape with the erasure prevention tab, remove from left side only and close the cassette holder.

3. Press “FAST FORWARD MEMORY” (Tape will be stop after 2 seconds)

4. Load a cassette tape with the erasure prevention tab, remove from right side only and close the cassette holder.

5. Press “REVERSE FM MODE/BP” (Tape will be stop after 2 seconds)

6. Load a pre-recorded tape with both side record tabs intact and close the cassette holder.

7. Press “PLAY/TUNE/TIME ADJ UP” (After TPS function, tape will stop automatically)

8. Press “REC/STOP” (Tape will not move)

9. Press “STOP/TUNE MODE” to indicate Error code.

• If several problem exist, error code will change each time when “■ /TUNE MODE” is pressed.

(e.g. H01 → H03 → F01 .....etc.)

10. Press “TAPE, DECK 1/2” to select Deck 1.

11. Repeat step 2 to 9 to test Deck 1. (Tape Deck 1 will not check H02 because of no recording function)

8.4. CD Mechanism Test (F15, F26, F16, F17, F27, F28, F29, H15, F75)

1. Press “CD”.

2. Press “OPEN/CLOSE (1)” and place a CD.

3. Press “OPEN/CLOSE (1)” to close the tray.

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SA-AK18

4. Press “OPEN/CLOSE (5)” and wait until the tray is open.

5. Press “OPEN/CLOSE (1)” and remove the CD.

6. Press “OPEN/CLOSE (1)” to close the tray.

7. Press “■/TUNE MODE” to indicate Error Code.

• If several problem exist, error code will change each time when “■/TUNE MODE” is pressed. (e.g. F15 → F26 → F16 ....etc).

8.5. To clear all Error code

1. Press “STOP/TUNE MODE” button for 5 seconds.

2. FL indicator shows “CLEAR” for 1 second and change to “T”.

8.6. How to get out from Self-Diagnostic function

1. Press “Power” button OFF.

8.7. Power Amplifier Failure (F61)

1. When power amplifier fail, F61 will indicate automatically.

9 Description of Error Code

9.1. Error detection for Cassette Mechanism block

No. Error Error

1 MODE SW

detection error

2 REC INH SW

detection error

3 HALF SW

detection error

4 Reel Pulse

detection error

5 TPS abnormal F02 Cassette deck will not perform TPS function.

Display

H01 Faulty operation of cassette mechanism.

H02 Recording not possible.

H03 Playback cannot perform.

F01 The tape advances slightly and then stops.

Problem condition

Faulty contact or short-circuit of mechanism mode switch (S951, S971).

Faulty contact or short-circuit of REC INH switch (S974, S975).

Faulty contact or short-circuit of HALF siwtch (S952, S972).

Faulty reel pulse, faulty hole detect IC (IC951, IC971).

Faulty playback EQ/recording amplifier IC (IC101).

9.2. Error detection for CD/Changer block

No. Error Error

1 REST SW detection error F15 CD does not function.

2 CD tray opens automatically F16 CLAMP switch (S4) NG (Check & Replace)
3 Does not startup when [PLAY]

button is pressed

4 Transmission error between CD

servo LSI and micon

5 Startup fails even when you

insert CD or the selected disc tray

does not open
6 Cannot insert CD F28 Tray 1 detect switch NG (Check & Replace)
7 Cannot eject CD F29 Check if disc is stuck. Tray 2 detect switch NG (Confirm & Replace)
8 The CD tray closes H15 CD disc tray detect switch NG (S3) (Check & Replace)

Display

F17 BOTTOM switch (S5) NG (Check & Replace)

F26 CD does not function.

F27 Tray 1 detect switch or Tray 2 detect switch NG (Check & Replace)

Problem condition

This error occurs when the Optical Pick Up REST SW (S701) is not
detected within the specified time (about 8 seconds)

This error occurs when the POWER is ON for the CD block and an error
is detected after the transmission has started.

9.3. Power Supply related error detection

No. Error Error

1 POWER AMP

output abnormal

Display

F61 When POWER is switched on, power become off automatically.

Problem condition

During normal operation, if DC DET become L, PCNT shall become
L and the error display on the left shall be displayed. (IC501)

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10 CD Test Mode Function

SA-AK18

This CD test mode is provided to check CD unit without
connecting to changer loading mechanism. This mode shall
operate CD PLAY with CD unit being connected only and CD
Automatic Alignment result is shown on FL display.

10.1. How to set CD test mode

10.2. CD Automatically Adjustment
result indication

Under CD test mode, pressing the numeric key ‘0’ on the
remote controller will display the auto adjustment result.
FLOCK, TLOCK and CLVS status shall be shown as below:

During the above display, executing CD PLAY will display auto
adjustment result for CD PLAY mode.

11 Measurements and Adjustments

11.1. Cassette Deck Section

• Measurement Condition

− Reverse-mode selector switch:

− Tape edit: NORMAL

− Record timer: OFF

− Make sure head, capstan and press roller are clean.

− Judgeable room temperature 20 ± 5 °C (68 ± 9°F)

• Measuring instrument

− EVM (Electronic Volmeter)

− Digital quency counter

• Test Tape

− Head azimuth adjustment (8 kHz, -20 dB); QZZCFM

− Tape speed gain adjustment (3 kHz, -10 dB);

QZZCWAT

− Playback gain adjustment (315 Hz, 0 dB); QZZCFM

− CrO2 tape, QZZCRX

11.1.1. Head Azimuth Adjustment (Deck
1/2)

wish to readjust the head azimuth without replacing the
acrews and springs, a fine adjustment to the azimuth screw
and spring.

• Please remove the screw-locking bond left on the head
base when replacing the azimuth screw.

• If you wish to readjust the head azimuth, be sure to adjust
with adhering the cassette tape closely to the mechanism
by pushing the center of cassette tape with your finger.
(shown in Fig. 3)

1. Playback the azimuth adjustment portion (8 kHz, -20dB) of
the test tape (QZZCFM) in the forward play mode. Vary the
azimuth adjustment screw until the output of the R-CH (PB
OUT-R) are maximized.

2. Perform the same adjustment in the reverse play mode.

3. After the adjustment, apply screwlock to the azimuth
adjusting screw.

Caution:

• Please replace both azimuth adjustment screw
(RHE5152ZB) and springs (RM0331) simultaneously when
readjusting the head azimuth. (shown in Fig. 2) Even if you

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SA-AK18

11.1.2. Tape Speed Adjustment (Deck 1/2)

11.1.3. Bias and Erase Voltage Check

1. Set the unit “AUX” position.

2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
the unit to “REC” mode (use “● REC/STOP” key).

3. Measure and make sure that the output is within the
standard value.

4. Insert the CrO2 tape (QZZCRX).

5. Repeat step 2 and 3.

Bias voltage for Deck 2 14 ± 4mV (Normal)
Standard value) 17 ± 5mV (CrO2)
Erase voltage for Deck 2 more than 80mV (Normal)

more than 90mV (CrO2)

1. Set the tape edit button to “NORMAL” position.

2. Insert the test tape (QZZCWAT) to DECK 2 and playback
(FWD side) the middle portion of it.

3. Adjust Motor VR (DECK 2) for the output value shown
below.

Adjustment target: 2940 ~3060Hz(NORMAL speed)

4. After alignment, assure that the output frequency of the
DECK 2 REV and DECK 1 FWD are within ±45Hz and ±60
Hz respectively of the value of the output frequency of
DECK 2 FWD.

11.1.4. Bias Frequency Adjustment (Deck
1/2)

1. Set the unit to “AUX” position.

2. Insert the Normal blank tape (QZZCRA) into DECK 2 and

set the unit to “REC” mode (● use “REC/STOP” key).

3. Adjust L1002 so that the output frequency is within the

standard value.

Standard Value: 97 ±8 kHz

11.2. Tuner Section

11.2.1. AM-IF Alignment

SIGNAL GENERATOR OR SWEEP

CONNECTIONS FREQUENCY

Fashion a loop of
several turns of wire
and radiate a signal
into the loop ant. of
receiver.

GENERATOR

450 kHz 30% Mod.
at 400Hz.

RADIO DIAL SETTING INDICATOR

Point of non-interference
(on/about 600 kHz)

(ELECTRONIC

VOLTMETER

OSCILLOSCOPE)

Headphones Jack (32Ω)
Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.

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ADJUSTMENT

(Shown in

Fig.3)

Z102 (AM IFT) Adjust for maximum output.

REMARKS

11.2.2. AM-RF Alignment

SA-AK18

SIGNAL GENERATOR OR SWEEP

CONNECTIONS FREQUENCY

Fashion a loop of
several turns of wire
and radiate a signal
into the loop ant. of
receiver.

Fashion a loop of
several turns of wire
and radiate a signal
into the loop ant. of
receiver.

GENERATOR

522 kHz Tuning capacitor fully closed Headphones Jack (32Ω)

603 kHz Tuning to signal Headphones Jack (32Ω)

RADIO DIAL SETTING INDICATOR

11.2.3. SW1-RF Alignment (GC)

SIGNAL GENERATOR OR SWEEP

CONNECTIONS FREQUENCY

Fashion a loop of
several turns of wire
and radiate a signal
into the loop ant. of
receiver.

Fashion a loop of
several turns of wire
and radiate a signal
into the loop ant. of
receiver.

GENERATOR

3.2 MHz Tuning capacitor fully closed Headphones Jack (32Ω)

3.2 MHz Tuning to signal Headphones Jack (32Ω)

RADIO DIAL SETTING INDICATOR

(ELECTRONIC

VOLTMETER

OSCILLOSCOPE)

Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.

Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.

(ELECTRONIC

VOLTMETER

OSCILLOSCOPE)

Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.

Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.

ADJUSTMENT

(Shown in

Fig.3)

Z152 (GC),

Z101(GN)

(AM OSC Coil)

Z152 (GC),

Z101(GN)

(AM ANT Coil)

ADJUSTMENT

(Shown in

Fig.3)

Z152

(SW1 OSC

Coil)

Z152

(SW1 ANT Coil)

REMARKS

Adjust for maximum output.

Adjust for maximum output.

REMARKS

Adjust for maximum output.

Adjust for maximum output.

11.2.4. SW2-RF Alignment (GC)

SIGNAL GENERATOR OR SWEEP

CONNECTIONS FREQUENCY

Fashion a loop of
several turns of wire
and radiate a signal
into the loop ant. of
receiver.

Fashion a loop of
several turns of wire
and radiate a signal
into the loop ant. of
receiver.

GENERATOR

9.4 MHz Tuning capacitor fully

9.4 MHz Tuning to signal Headphones Jack (32Ω)

RADIO DIAL SETTING INDICATOR

closed

(ELECTRONIC

VOLTMETER

OSCILLOSCOPE)

Headphones Jack (32Ω)
Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.

Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.

ADJUSTMENT

(Shown in

Fig.3)

Z151

(SW2 OSC Coil)

Z151

(SW2 ANT Coil)

REMARKS

Adjust for maximum output.

Adjust for maximum output.

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11.3. Alignment Points

Cassette Deck section

Tuner section

20

12 Illustration of IC’s, Transistors and Diodes

SA-AK18

M38199MF227 (100P)

M62433AFP (80P)

MN662790RSC (80P)

BA7755A

2SK544F-AC

2SA1037AKSTX

2SC2412KT96R
DTC144TKA146
DTA114EKA146

KRA102STA

DTC114EKA146

STK470-010A

1

19

M5218AP

2SB1238QRTV2

KTC3875GRTA

KRC111STA

KTD1304TA

KRC102STA

DTC143XKA146

RSN3502B

0N2180RLC1

2

1

3

4

2

3

4

1

2SC3940AQSTA

BU2090AF-E2 (16P)

LA1833NMNTLM (24P)

LC72131MDTRM (20P)

AN7348STA-E1 (24P)

BA4558FE2 (8P)

M62457AFPE1 (16P)

AN8839NSBE2 (28P)

KTA12710YTA

2SD965RTA

2SB621ARSTA

2SA933SSTA

2SC1740SSTA

2SC2787FL1TA

2SD2144STA

KTC3199GRTA

RVTDTC143EST

AN8739SBE2

KRC110MTA

KRA102MTA
KRC103MTA
KRC102MTA

2SC2786MTA

2SC2784FTA

RVTDTA114EST

2SC2785FTA

2SA1309ARTA

TA7291P

1

2SA1309ARTA
2SC2058SPTA

B

C

E

10

DAP202KT146

MTZJ10BTA
MTZJ4R7BTA
MTZJ8R2BTA

MTZJ12BTA
MTZJ7R5ATA

MA4020LTA

MTZJ6R8BTA

MTZJ33BTA

MTZJ16BTA

1D3E

RL1N4003S-P

1SS355TE17

UDZSTE175R1B

UDZTE173R6B

DA204KT146

SVC211SPA-AL

SLI325URCT31

SLI325DCT31

SLR325MCT31W

SLR505DCT31

GP1S94

RVD1SS133TA

1SS291TA

MA165TA

MA700ATA

MA723TA

21

SA-AK18

13 Terminal Function of ICs

13.1. IC701 (AN8839NSBE2) Servo Amplifier

Pin No. Mark I/O Function

1 PDE I Tracking signal input 1
2 PDF I Tracking signal input 2
3 VCC I Power supply
4 PDA I Focus signal input terminal 1
5 PDB I Focus signal input terminal 2
6 LPD I APC amp input
7 LD O APC amp output
8 RF O RF summing output
9 RFIN I Detector’s input
10 CSBRT I Capacitor for OFTR connection
11 CEA I Capacitor for HPF amp connection
12 BDO O BDO output (“H” : drop out)
13 LDON I APC control
14 GND — Ground

Pin No. Mark I/O Function

15 /RFDET O NRFDET output (“L” : detec tion)
16 PDOWN O Power-down input
17 OFTR O OFTR output
18 NC O N.C.
19 ENV O 3T-ENV output
20 NC I N.C.
21 NC I N.C.
22 TEN I TE amp input
23 TEOUT O TE amp output
24 FEOUT O FE amp output
25 FEN I FE amp input
26 VREF O Reference voltage output
27 TBAL I Tracking balance control
28 FBAL I Focus balance control

13.2. IC702 (MN662790RSC) Servo processor/ Digital signal processor/
Digital filter/ D/A converter

No. Mark I/O Function

1 BCLK O N.C.
2 LRCK O N.C.
3 SRDATA O N.C.
4 DVDD1 I Power supply input (for digital

circuit)
5 DVSS1 I GND (for digital circuit)
6 TX O Digital audio interface signal

output (Latches data at first

transition)
7 MCLK I Microprocessor command

clock signal input
8 MDATA I Microprocessor command

data signal input
9 MLD I Microprocessor command

load signal input
10 SENSE O Sense signal output (OFT,

FESL,MAGEND,NAJEND,PO

SAD,SFG) (Not used, open)
11 /FLOCK O Focus servo feeding signal

output (“L” : Feed)
12 /TLOCK O Tracking servo feeding signal

output (“L” : Feed)
13 BLKCK O Sub-code block clock signal

output (fBLKCK = 75Hz

during normal playback)
14 SQCK I External clock signal input for

sub-code Q resistor
15 SUBQ O Sub-code Q code output
16 DMUTE I Muting input (“H”: mute)
17 STAT O Status signal output

(CRC,CUE,CLVS,TTSTVP,F

CLV,SQCK)
18 /RST I Reset signal input
19 SMCK O 1/2-divided clock signal of

crystal oscillating at MSEL =

“H” (fSMCK = 8.4672 MHz)

1/4-divided clock signal of

crystal oscillating at MSEL =

“L” (fSMCK = 4.2336 MHz)
20 CSEL I Frequency Selection Terminal

H = 33.8688 MHz; L =

16.9344 MHz
21 TRV O N.C.
22 TVD O Traverse drive output
23 PC O Spindle motor ON outpu t ("L"

: ON)

No. Mark I/O Function

24 ECM O Spindle motor drive signal

output(forced mode output)

25 ECS O Spindle motor drive signal

output

(servo error signal output)
26 KICK O N.C.
27 TRD O Tracking drive output
28 FOD O Focus drive output
29 VREF I D/A (drive) output (TVD, ECS,

TRD, FOD, FBAL, TBAL)

Reference voltage input
30 FBAL O Focus balance adjustment

output
31 TBAL O Tracking balance adjustment

output
32 FE I Focus error signal input

(analog input)
33 TE I Tracking error signal input

(analog input)
34 RFENV I RF envelope signal input
35 VDET I Vibration detection signal

input ("H" : detection)
36 OFT I Off-track signal input ("H" : off

track)
37 TRCRS I Track cross signal input
38 /RFDET I RF detection signal input ("L"

: detection)
39 BDO I Dropout signal input ("H" :

Dropout)
40 LDON O Laser on signal output ("H" :

ON)
41 PLLF2 I/O N.C.
42 DSLF2 O Tracking Offset alignment

output/DSL Balance Output

(DA Output)
43 WVEL O N.C.
44 ARF I RF signal input
45 IREF I Reference current input
46 DRF I DSL bias terminal (Not used,

open)
47 DSLF I/O DSL loop filter terminal
48 PLLF I/O PLL loop filter terminal
49 VCOF I/O VCO loop filter terminal
50 AVDD2 I Power supply input (for

analog circuit)
51 AVSS2 I GND (for analog circuit)

22

No. Mark I/O Function

52 EFM - EFM signal output
53 PCK - PLL extraction clock output

(fPCK = 4.321 MHz during
normal playback)

54 VCOF2 I/O VCO Loop filter for 33.8688

MHz conversation terminal for

16.9344 MHz crystal mode,

must use other circuit
55 SUBC O Sub-code serial data output
56 SBCK I Clock input for sub-code

serial data
57 VSS I GND
58 X1 IN I Crystal oscillating circuit input

(f = 16.9344MHz)
59 X2 OUT O Crystal oscillating circuit input

(f = 16.9344 MHz)
60 VDD I Power supply input (for

oscillating circuit)
61 BYTCK - Byte clock output
62 /CLDCK - Sub-code frame clock signal

output (fCLDCK = 7.35 kHz

during normal playback)
63 FCLK - Crystal frame clock signal

output (fCLK = 7.35 kHz,

double = 14.7 kHz)
64 IPFLAG - Interpolation flag output (“H” :

Interpolation)
65 FLAG - Flag output

SA-AK18

No. Mark I/O Function

66 CLVS - Spindle servo phase

synchronizing signal output
("H" : CLV, "L" : rough servo)

67 CRC - Sub-code CRC checked

output (“H” :OK, “L” :NG)

68 DEMPH - De-emphasis ON signal

output (“H” :ON)

69 RESY - Frame re-synchronizing signal

output
70 IOSEL I Mode switching terminal
71 /TEST I Test input
72 AVDD1 I Power supply input (for

analog circuit)
73 OUTL O Left channel audio signal

output
74 AVSS1 I GND
75 OUTR O Right channel audio signal

output
76 RSEL I RF signal polarity assignment

input

(at "H" level, RSEL="H", at "L"

level, RESL="L")
77 IOVDD I 5V supply input
78 PSEL I Test terminal (connected to

Gnd)
79 MSEL I SMCK oscillating frequency

designation input (“L” :4.2336

MHz, “H” :8.4672 MHz)
80 SSEL I SUBQ output mode select

(“H” :Q-code buffer mode)

13.3. IC703 (AN8739SBE2) Focus coil/ Tracking coil/ Traverse motor/
Spindle motor driver

No. Mark I/O Function

1 /RST - RESET output terminal
2 NC - N.C.
3 IN2 I Motor Drive (2) input
4 PC2 I Turntable motor drive signal

(L : ”ON”)
5 NC - N.C.
6 IN1 I Motor driver (1) input
7 NC I N.C.
8 PVCC1 I Power supply (1) for driver
9 PGND1 - Ground connection (1) for driver
10 NC - N.C.
11 D1- O Motor driver (1) reverse-action

output
12 D1+ O Moto r driver (1) forward-action

output
13 D2- O Motor driver (2) reverse-action

output
14 D2+ O Moto r driver (2) forward-action

output

No. Mark I/O Function

15 D3- O Motor driver (3) reverse-action

output

16 D3+ O Motor driver (3) forward-action

output

17 D4- O Motor driver (4) reverse-action

output

18 D4+ O Motor driver (4) forward-action

output
19 NC - N.C.
20 PGND2 - Ground conn ection (2) for driver
21 PVCC2 I Power supply (2) for driver
22 NC - N.C.
23 VCC I Power supply terminal
24 VREF I Reference voltage input
25 IN4 I Motor driver (4) input
26 IN3 I Motor driver (3) input
27 RSTIN I Reset terminal
28 NC - N.C.

13.4. IC600 (M38199MF227) System Microprocessor

No. Mark I/O Function

1 CRT/SER 4 I/O CRT Timer/ (SP_LTH) latch

signal for ASP
2 TPS I Tape Mecha TPS input
3 DECK 1 I Tape Mecha condition input

(HALF 1/ MODE/ PHOTO

1/PHOTO 2)
4 DECK 2 I Tape Mecha condition input

(HALF 2/ RECI_F/ MODE/

RECI_R)
5 KEY 4 I Key 4 input
6 KEY 3 I Key 3 input
7 KEY 2 I Key 2 input

No. Mark I/O Function

8 KEY 1 I Key 1 input
9 SER 1 O Serial Data/Clock (D_CLK,

F_CLK)

10 SER 2 O Serial Data/Clock (MKDATA,

D_DAT)

11 SER 3 O Serial Data/Clock (F_DAT,

SP_DAT)

12 SER 5 O Deck Control/ASP Clock

output (MKCLK, SP_CLK)
13 SPE I Speana input
14 V_JOG_AB I Volume jog A-D detection

input

23

SA-AK18

No. Mark I/O Function

15 J_JOG_AB I EQ Joy jog A-D detection

input

16 CHG_AD1 I (OPEN/CLAMP)Changer

switch A-D detection input 1

17 CHG_AD2 I (POSITION/BOTTOM)

Changer switch A-D

detection input 2
18 CDRST I/O CD RESET output
19 STATUS I CD Signal Processor status

input (INV)
20 SQCLK I/O Tuner IF data/ Stereo input

and CD Subcode Clock

output
21 SD I/O Tuner Signal detect input
22 ST/DO/SUBQ I CD Subcode data input (INV)
23 CHG_CW O Changer motor CW output
24 CHG_CCW O Changer motor CCW output
25 CHG_HALF O Changer half drive output
26 MLD/PPLC E O CD comm and load

output/Tuner PLL chip enable
27 MDATA/

PLLDA

28 MDATA/

PLLCLK

O CD command data

output/Tuner PLL data output

O CD command clock

output/Tuner PLL clock

output
29 RESTSW I CD limit switch input for the

most inner point
30 BLKCK I CD block clock input (INV)
31 RMT I Remote control input
32 DCDET I DC detect input
33 ECONO O Main transformer control

output for economy mode
34 SYNC I AC failure detect input
35 RESET - RESET input
36 XCIN - X’tal oscillator (f = 32.768

kHz sub clock)
37 XCOUT - X’tal oscillator (f = 32.768

kHz sub clock)
38 XIN - X’tal oscillator (f = 8.0 MHz

main clock)
39 XOUT - X’tal oscillator (f = 8.0 MHz

main clock)
40 VSS - Ground (0V)
41 MBP1 O MPU beat proof output 1
42 MBP 2 O MPU beat proof output 2
43 CHG_SW 2 I/O CD changer switch 2 input
44 CHG_SW 1 I/O CD changer switch 1 input
45 CHG_PLGR O Changer plunger output
46 SP_A O Speana control output A
47 SP_B O Speana control output B
48 SP_C O Speana control output C
49-54 GRD8-

GRD13

O Digit drive output (Grid drive

output)
55-61 GRD1-GRD7 O Digit drive output (Grid drive

output)
62-83 SEG32-

SEG11

84-90 SEG10-

SEG4/REG10

-REG4

O Segment drive output (Anode

drive output)

O Segment drive output (Anode

drive output)/For region

setting/Function selection

use/Key scan output at

RESET START
91 VCC - Power supply (+5V)
92 REG3/SEG3 O Segment drive output (Anode

drive output)
93 REG2/SEG2 O For region setting/Function

selection use
94 REG1/SEG1 O Key scan output at RESET

START
95 REG_IN/

EECS

I/O Region and function setting

input and EEPROM clock

output

No. Mark I/O Function

96 EEDAT - EEPROM data input
97 EECLK - EEPROM chip select output
98 VEE - Power supply (-30V)
99 AVSS - Analog Ground (0V)
100 VREF - Refer ence for A-D

24

14 Block Diagram

SA-AK18

T+ T-

TRAVERSE

MOTOR

SPINDLE

MOTOR

OPTICAL PICKUP

SEMICONDUCTOR

LASER

+B

PHOTO DETECTOR

E

D
A

D

FF

FOCUSTRACKING

COIL

COIL

M

_

M

_

Q701
LASER

POWER DRIVE

+B

E

C
B

C

LDON

F-F+

IC702

MN662790RSC

SERVO PROCESSOR
/DIGITAL SIGNAL

PROCESSOR

/DIGITAL FILTER
/D/A CONVERTER

IC703

AN8739SBE2

FOCUS COIL/
TRACKING COIL/
TRAVERSE MOTOR/

SPINDLE MOTOR

DRIVE

RESET

D4+

18

SIGNAL

GEN.

FOCUS

D4-

17

COIL

DRIVE

16

D3+

TRACKING

15

D3-

COIL

DRIVE

D1+

12

TRAVERSE

11

MOTOR

D1-

DRIVE

14

D2+

SPINDLE

MOTOR

13

D2-

DRIVE

9

PGND1

20

PGND2

13

/RST

VREF

PVCC1
PVCC2
VCC

6

7

4

5

1

2

IN3

IN4

IN1

PC284

AN8839NSBE2

SERVO AMP

LPD

LD

PDA

LDON

PDB

PDE

PDF

1

24

26

25

6

3IN2

21
23

IC701

+

-

+B

­+

+B

RF

44

39

BDO

38

/RFDET

34

RFENV
FE
TE
OFT 36 OFT

37
35

29

VREF

31

TBAL

30

FBAL

41
43

42

40

LDON

+B

+B

+B
+B

+B

+B

+B

­+

F

47 80448

DSLF

ARF

DSL

SYNCHRONIZING

PROTECTION

BDO

SERVO

INPUT

/RF DET

PORT

RF ENV

FE3332
TE

TRCRS
VDET

VREF
TBAL
FBAL

PLLF2
WVEL

CONVERTER

DSLF2

LDON

TRD

28

+B

+B

A/D

D/A

22

­A

+

­B

+

Ech

VCBA

Fch

PHASE

COMPARATOR

CONVERTER

TVD27FOD

ECS

25

­+

Ach
VCBA
Bch

Vref

TBAL

27

TBAL

PLLF

VCO

SYNCHRONIZING
INTERPOLATION
PROTECTION

RAM

ADDRESS

GENERATOR

CLV

SERVO

SERVO

CPU

SERVO OUTPUT

ECM

KICK

TRV23PC

24

2126

Subtracter

FBAL

28

FBAL

DV DD1

FREQUENCY
COMPARATOR

DEMODULATOR

PORT

SENSE

10 11

8

RF

+B

TEIN

22 23

+B

50

7260

SSEL

V DD

AV DD2

EFM

DATA

16K
SRAM

PEAK

DETECTOR/

AUTO CUE

SUB-CODE

DEMODULATOR

CRCC
CHECK

CRCC
CHECK

/RST

TLOCK

FLOCK

/RSTEST/DO

RFIN

Subtracter

+B

+B

AVDD1

BLKCK

1418 1312 15

BLKCK

10

9

CSBRT CEA

+B

PDOWN

16

+B

SYNDROME
CALCULATION

CIRC
DECODER

INTERPOLATION

/SOFT MUTING
ATTENUATION

SQCK

SUBQ

SUBQ

+B+B

11

OFTR

3

DET.

TENV

BDO
DET.

RF

DET.

­+

+B

­+

+

-

+B

TEOUT

N.C.

21

TE

/DIGITAL

DIGITAL DE-EMPHASIS

DIGITAL FILTER

MASH LOGIC

MIRCOMPUTER
INTERFACE

MDATA

STAT

879

17

MDATA

STATUS

­+

­+

­+

DIGITAL AUDIO
INTERFACE

S/P

CONVERTER

LOGIC

PWM

PWM

LOGIC

MCLK

MLD

+B

MLD

MCLK

RESET

ENV

OFTR

BDO

/RFDET

FEN

FEOUT

VCC

VREF

GND

N.C.

TIMING

GENERATOR

/PITCH

CONTROL

S701(RESET)

19

17

12

15

/RFDET

25

24

3

26

14

18

/CLDCK

TX 6

DMUTE

SMCK

RSEL
VREF

OUTL

+

-

OUTR

+

-

SUBC
SBCK

DVSS1

CSEL
PSEL

NSEL

X1 58

+B

+B

16

59X2

19

76
29

73

75

55
56
5

20
78

79
62

RF

ENV

OFTR

BDO

FE

-B

+B
+B

CD SIGNAL

(CD SIGNAL)

X701

R CH

25

SA-AK18

This page is only applicable for GN/GT areas

FM ANT

Z120

Q1 Q2

1

RF AMP

5

MIXER

Q3
OSC

346

+B

(FM)

Q4

BUFFER

AM ANT

CF201

7

Q101

FM
IF AMP

CF202

AM
ANT
COIL

Z101

AM
OSC
COIL

+B

(FM)

IC101

LA1833NMNTLM

FM/AM IF AMP,

8

DET/AM OSC,
MIX/FM MPX

RCH

REG

PHASE
DET

VCO

FF

14

DECODER

STEREO
SWITCH

FF

13

PILOT

CANCEL

PILOT

FF

DET

24 23 22

ALC

BUFFER

LEVEL
DET

FM
IF

FM
DET

12

AM

OSC

S-CURVE

REG

3

AM
MIX

AM/FM
IF
BUFFER

4

AM
RF AMP

AM
IF

AGC

COMP

TUNING
DRIVE

SD

65

182021 19 17

AM
DET

ST

871091211

16 15

+B

Z102

AM
IFT

16

17

18

11

PHASE DETECTOR
CHARGE PUMP

UNLOCK
DETECTOR

REFERENCE
DIVIDER

SWALLOW COUNTER
1/6,1/17,4 BITS

12 BITS PROGRAMMABLE

DIVIDER

1
2

1

20

14

12

13

X102

Q305

ST/DO

SD

X103

DO

5

CE

UNIVERSAL
COUNTER

15

+B

Q106

POWER

+B

SUPPLY

CONTROL

+B

(FM:ON)

POWER ON
RESET

SHIFT REGISTER LATCH

19

710 912 6

IC102

LC72131MDTRM

PLL FREQUENCY SYNTHESIZER

C2B
I/F

8

2
3DI

4CL

ST/DO

CE

DI

CL

E

26

This page is only applicable for GC areas

FM ANT

Z120

Q1

1

RF AMP

5

Q2

MIXER

Q3

OSC

346

+B

(FM)

Q4

BUFFER

SA-AK18

CF201

7

8

Q101

FM
IF AMP

CF202

IC101

LA1833NMNTLM

FM/AM IF AMP,
DET/AM OSC,
MIX/FM MPX

RCH

Q152

SWITCH

AM ANT

AM EXT ANT

Q154

SWITCH

13
14

15

16

Q158

SWITCH

Q159

SWITCH

Q155

16

17

18

11

LW
OSC
COIL

SW1
OSC

MW
OSC

Q151

SWITCH

10

11

+B

Q153

SWITCH

21

20

19
18
17

PHASE DETECTOR
CHARGE PUMP

Q157

+B

UNLOCK
DETECTOR

SWITCH

Q107

MUTING

SWALLOW COUNTER
1/6,1/17,4 BITS

12 BITS PROGRAMMABLE
DIVIDER

24 23 2122

ALC

AM
OSC

BUFFER

LEVEL
DET

FM
IF

12

REFERENCE
DIVIDER

S-CURVE

FM
DET

M

1
2

REG

3

AM
IFT

Z102

AM/FM
IF
BUFFER

4

20 19 18

AM

AM

RF AMP

MIX

17

AGC

AMAM

IF

DET

COMP

TUNING
DRIVE

ST

SD

856 7

X102

ST/DO

SD

1

X103

20

14

13

Z151

5

4

1

MW
ANT

2

COIL

Z152

9

1

SW1
ANT

2

8

3

7

MW

6

ANT

4

5

3

10

12

SWITCH

986

7

11

Q156

SWITCH

1516

PHASE
DET

VCO

REG

10911

+B

14 13

DECODER

STEREO
SWITCH

PILOT

CANCEL

PILOT

FFFFFF

DET

12

DO

5

ST/DO

CE

UNIVERSAL
COUNTER

15

+B

Q106

POWER

+B

SUPPLY

CONTROL

+B

(FM:ON)

POWER ON
RESET

SHIFT REGISTER LATCH

19 10 7 12 6 9 8

IC102

LC72131MDTRM

PLL FREQUENCY SYNTHESIZER

C2B
I/F

2CE

DI

3

CL

4CL

DI

TO CD UNIT

E

27

SA-AK18

IC1

TA7291P

MOTOR DRIVE

8

Vs

-B

REG

5

IN1

IN2

6

4

Vref

1

7

Vcc

GND

OUT1

2

OUT2

10

M

RM1

+B

STATUS

SUBQ

ST/DO

BLKCK

/CDRST

RESTSW

SD

CE/MLD

DI/MDATA

CL/MCLK

VT

Q1

POWER

SUPPLY

CONTROL

Q902

INTERFACE

A

26

MLD/PLLCE

27

MDATA/PLLDA

28

MCLK/PLLCLK

Q901

INTEFACE

Q903

INTERFACE

SD

2921

RESTSW

3018 2220

CDRST

BLKCK

SQCLK

STATUS

ST/DO/SUBQ

2319 24

CHG_CW

M38199MF227

25 17

CHG_CCW

IC600

+B

CHG_HALF

SYSTEM CONTROL/FL DRIVE

SW5

+B

SW4

CHG_AD2

SW2

SW1

SW3

16 44

CHG_AD1

43

CHG_SW1

CHG_SW2

Q350

PLUNGER

Q351

SUPPLY

DRIVER
SWITCH
SUPPLY

45

CHG_PLGR

-B

28

SA-AK18

(DECK 1)
P.B.
HEAD

(DECK 2)
R/P
HEAD

LCH

LCH

IC1004

BA7755A

R/P SELECT

4

2

1

+B

IC1001

AN7348STA-E1

P.B. EQ /TPS AMP
REC AMP./ALC

(DECK 2)
ERASE
HEAD

3

5

Q1017
MOTOR

DRIVE

M

MOTOR

SOLENOID

D951

REC;ON/

BEAT PROOF

SWITCHING

Q1001,Q1003

IC1002

BU2090AF-E2

I/O EXPANDER

Q1023

Q1019

SOLENOID

DRIVE

(DECK 1)

24(23)

22(3)
21(4)

17(8)

Q1012(Q1013)

1(2)

+

20(5)

-

18(7)

6

19

15

12

L601

LOGIC L/H

ALC

NOR/CrO &
HI/LO LOGIC

LOGIC
REC/PB

9

+B

RIPPLE
REJECTION

BIAS OSC
CONTROL

Q1004~Q1007

10

16

14

13

11

Q1022

MUTING

(Q1015)

(Q1021)

Q1014

Q1020

Q1016

BUFFER

AMP

FILTER

AMP

SWITCH

(DMT)

IC1003

BA4558FE2

BUFFER

AMP

Q1024

TPS
DRIVE

+B

16

VCC

CONTROL
CIRCUIT

1M13

LATCH

BP17

1PL15

REGISTER

12-BIT SHIFT

GND

1

2

DATA

3

CLK

11

REC

12

CR02

1H

10

8

OUTPUT BUFFER

2PL

14

Q1018

SOLENOID

DRIVE

(DECK 2)

SOLENOID

D971

Z1002

S972

(HALF)

(MODE)

S971

(Cr02)

S973

M38199MF227

PHOTO

INTERRUPTER

INTERFACE

4

IC600

15

SW600

(VOLUME)

IC971

ON2180RLC1

(DECK 2)

(Q1008,Q1009)

DECK 2

SYSTEM CONTROL/FL DRIVE

J_JOG_A/B

S974

INTERFACE

29

(F.REC INH)

95

(R.REC INH)

S975

REG_IN

S952

(HALF)

14

VR600

JOG VOL

S953

S951

(MODE)

INTERFACE

(Q1010,Q1011)

V_JOG_A/B

(Cr02)

3

PHOTO

INTERRUPTER

DECK 1

Z1001

IC951

ON2180RLC1

(DECK 1)

2

TPS