Technics SL-PD7 User manual

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Table Of Contents

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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
(16-15/16” x 4-29/32” x 14-23/32”)
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.
© 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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