Technics SLPD-7 Service manual
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Table Of Contents
COVER
1 Safety Precaution
2 Before Repair and Adjustment
3 Handling Precautions For Traverse Deck
4 Precaution of Laser Diode
5 Protection Circuitry
6 Accessories
7 Front Panel Controls
7.1 Front Panel
8 Operation Checks and Main Component Replacement Procedures
8.1 Checking Procedure for each major P.C.B.
9 Self-Diagnostic Display Function
10 Type Illustrations of ICs, Transistors& Diodes
11 Terminal Functions of ICs
11.1 IC701 (AN8885SBE1) Servo Amplifier
11.2 IC702 (MN662790RSC) Servo processor/ Digital signal processor/ Digital filter/ D/A converter
11.3 IC703 (AN8739SBE2) Focus coil/ Tracking coil/ Traverse motor/ Spindle motor driver
11.4 IC401 (C2BBGD000075) Microprocessor
12 Block Diagram
13 Schematic Diagram
14 Printed Circuit Board
15 Troubleshooting Guide
16 Wiring Connection Diagram
17 Parts Location and Replacement Parts List
17.1 CD Loading Mechanism
17.1.1 CD Loading Mechanism Part Location
17.1.2 CD Loading Mechanism Part List
17.2 Cabinet
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17.2.1 Cabinet Parts Location
17.2.2 Cabinet Parts List
17.3 Electrical Parts List
17.4 Packing Materials& Accessories Parts List
17.5 Packaging
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Service Manual
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Order No. MD0102030C1
A2
Compact Disc Changer
SL-PD7
Colour
(K) ... Black Type
P ... U.S.A.
PC ... Canada
TRAVERSE DECK
RAE0152Z-3 Mechanism Series
AUDIO
No. of channels 2 (left and right, stereo)
Frequency response 2-20000 Hz,±1 dB
Output voltage 2V (at 0 dB)
Dynamic range 92 dB
S/N 100 dB
Total harmonic distortion 0.007% (1kHz, 0 dB)
Wow and flutter Below measurable limit
DA converter MASH (1 bit)
Output impedance Approx. 1kO
Load impedance More than 10 kO
PICKUP
Wavelength 780 nm
GENERAL
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Power supply AC 120 V, 60 Hz
Power consumption 9 W
Dimensions (W x H x D) 430 x 125 x 374 mm
Mass 4.5 kg (9.9 lb.)
Power consumption in standby mode: 1 W
Notes:
1. Specifications are subject to change without notice./Mass and dimensions are approximate.
(16- 15/16” x 4- 29/32” x 14-23/32”)
© 2001 Matsushita Electronics (S) Pte. Ltd. All rights reserved. Unauthorized copying and distribution is a
violation of law.
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1 Safety Precaution
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(This “Safety Precaution” is applied only in U.S.A.)
1. Before servicing, unplug the power cord to prevent an electric shock.
2. When replacing parts, use only manufacturer’s recommended components for safety.
3. Check the condition of the power cord. Replace if wear or damage is evident.
4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance
test to prevent the customer from being exposed to a shock hazard.
Insulation Resistance Test
1. Unplug the power cord and short the two prongs of the plug with a jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the jumper AC plug and each exposed metal cabinet
part, such as screw heads, antenna, control shafts, handle brackets, etc. Equipment with antenna terminals
should read between 3MO and 5.2MO toall exposed parts*. (Fig 1) Equipment without antenna terminals
should read approximately infinity to all exposed parts. (Fig 2)
*Note: Some exposed parts may be isolated from the chassis by design. These will read infinity.
4. If the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment
should be repaired and rechecked before it is returned to the customer.
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2 Before Repair and Adjustment
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Disconnect AC power, discharge Power Supply Capacitors C12 through a 10 O, 5 W resistor to ground. DO NOT
SHORT-CIRCUIT DIRECTLY (with a screw driver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid over current.
Current consumption at AC 120 V, 50 Hz and 60 Hz in NO SIGNAL mode should be 50~130 mA and 40~80 mA
respectively.
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3 Handling Precautions For Traverse Deck
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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 finishthe work quickly.
3. Take care not to apply excessive stress to the flexible board (FFC).
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 diode against electrostatics
breakdown. Be sure to remove the solder from the short point before making connections.
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4 Precaution of Laser Diode
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Caution:
This unit utilizes a class 1 laser. Invisible laser radiation is emitted from the optical pickup lens. When the unit is
turned on:
1. Do not look directly into the pickup lens.
2. Do not use optical instruments to look at the pickup lens.
3. Do not adjust the preset variable resistor on the pickup lens.
4. Do not disassemble the optical pickup unit.
5. If the optical pickup is replaced, use the manufacturer’s specified replacement pickup only.
6. Use of control or adjustments or performance of procedures other than those specified herein may result in
hazardous radiation exposure.
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.
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5 Protection Circuitry
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The protection circuitry may have operated if either of the following conditions are noticed:
No sound is heard when the power is turned on.
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
ofthe 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.
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6 Accessories
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AC power supply cord... 1 pc.
Stereo connection cable... 1 pc.
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7 Front Panel Controls
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7.1 Front Panel
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7.1 Front Panel
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8 Operation Checks and Main Component
Replacement Procedures
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“ATTENTION SERVICER”
Some chassis components maybe have sharp edges. Be careful when diassembling 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.
Content
Checking Procedure for each major P.C.B.
.................................................................................................................. P.g. 7~9
8.1 Checking Procedure for each major P.C.B.
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8.1 Checking Procedure for each major P.C.B.
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Step 1 Remove all the screws.
Step 3 Remove all the screws and remove top cabinet as shown.
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Step 4 Release the connectors CN601 and CN602.
Step 5 Remove all the screws.
Step 6 Pull the front panel in both direction of arrow B to unlock the rib and then remove the front in the direction
of arrow A.
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Step 7 Remove all the screws.
Step 8 To check Panel P.C.B. component side release both catches.
Step 9 Keep the close lock gear pressed in the direction shown, and move the tray in the direction shown.
Step 10 Fit the claw of the tray and the claw of the Base tray guide (left & right side).
Step 11 Remove the screw and the Rotary tray.
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Step 12 Remove the connector CN403.
Step 13 Remove the screw.
Step 14 Pull the claw in the direction shown and remove the tray.
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Step 15 Remove all the screws.
Step 16 Release the connectors CN302 and CN404.
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9 Self-Diagnostic Display Function
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Self-diagnostic display
This unit is equipped with a self-diagnostic display function which, if a problem occurs, will display an error code correcsponding to the problem.
Use this function when performing maintenance on the unit.
Entering the Self-Diagnostic Mode
1. With no CD loaded in the tray, turn on the unit.
2. Unplug the power cord of the unit, and then plug it back in while pressing the STOP (
), PLAY (
) and DISC 4 buttons together.This will bring up the FL display.
3. Release the above three buttons.
To Display Self-Diagnostics Results
1. When the FL display lights up, the unit automatically repeats an approximately 50-second cycle of the following operations.
START
A. Tray opens. -------- (A)
B. Tray closes. -------- (B)
C. Traverse deck lifts.
D. Tray opens.
E. Tray closes. -------- (B)
F. Traverse deck lower down.
G. Rotary tray turns counter-clockwise two disc slots. -------- (C)
H. Traverse deck lifts once, and then lowers
I. Rotary tray turns clockwise one disc slot. -------- (C)
J. Traverse deck lifts once, and then lowers
K. Rotary tray turns clockwise three disc slots. -------- (C)
L. Traverse deck lifts once, and then lowers
M. Rotary tray turns counter-clockwise one disc slot. -------- (C)
N. Traverse deck lifts once, and then lowers
O. Rotary tray turns counter-clockwise two disc slots./(Repeats from a - o).
2. Self-diagnostic fault results appear on the FL display for approximatelly one second as “H15” at location (A), “H16” at (B) and “H18” at (C), during the
above cycle.
To Return to Normal Display
Press the power button to off the unit, and then turn it on again.
To Display Self-Diagnostics Results Again
Follow steps 1 through 3 of “Entering Self-Diagnostic Mode” above.
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