Panasonic sa ex 500 service manual

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ORDER NO. MD9608060C2

- Service Manual

AV Control Stereo Receiver Receiver
SA- EX500
M llllllllllll °°'°"
, . , . ,1 M (K) Black Type
Area
F .
Suffix for
Model No. Area C°'°'
(E) Europe
(EB) Great Britain (K)
* Manufactured underlicense from Dolby Laboratories Licensing Corpo-
ration Additionallylicensed under one or more of the following patents: (EG) Germany and Italy
U.S. numbers 3,632,886,3,746,792 and 3,959,590; Canadian numbers
1,004,603 and 1,037,877.
"Dolby and the double-D symbol are trade marks of Dolby Laboratories
Licensing Corporation
I SpeCIflcatlons
I Amplifier Section Channel balance (250Hz-e.3kHz) :1 dB
Power output (3 240V) Channel separation _ 55GB
DIN 1kHz (T.H.D. 1%) 2 x 100W (4D) Headphones output level and impedance 430mV/330S2
20 112-20 kHz continuous power output
both channels driven 2 x 65W (89) I FM Tuner Section
Total harmonic distortion Frequency range 87.5 - 103,0MH2
Hated power at 20 Hz - 20kHz 0.05% (89) Sensitivity
Half power at 1 kHz 0.03% (852) SIN 3MB 1~5HV/75Q
Power output at the Dolby Pro Logic operation SIN 26dB ISM/759
DIN 1 kHz (T.H.D. 1%) SIN 20dB 1.2uV/7552
Front 2X60 W (49) IHF usable sensitivity 1.5),lV/75Q (IHF 58)
Center 60 W (89) IHF issue stereo quieting sensitivity 22nvnso
Surround 9 30 W (89) Total harmonic distortion
Damping factor 30 (8(2) MONO 02%
Load Impedance STEREO 0.3%
Front 4-169 SIN
Center 8-169 mono 60dB (75dB, IHF)
surmund_ _ 4-169 STEREO 58113 (71:15, IHF)
lntermodulatlon distortion Frequency response 20Hz - 15 kHz (+1dB, -2dB)
rated power at 60Hz: 7kHz=4:1 , SMPTE 05% (89) Alternate channel selectivity i400kHz 55.15
Power bandwidth Capture ratio MB
both channels driven, GdB 10H: - 40kHz(BS)) Image rejection at 98MHZ 40GB
FTEQUEMV IBSPOnse IF rejection at 98MHz 70dB
PHONO RAA standard we Spurious response relection at 98MHz 70dB
(30HZ-15KHZ) i 03GB AM suppression sodB
CD, TAPE, VCR 1, TVNCR 2 10Hz - 40kHz, 1: 3:18 Stereo separation
Input sensitivity and impedance 1 kHz 40,13
PHONO 3""V/47k9 Carrier leak
CD, TAFE, VCR 1, TVNCR 2 ZOOmV/ZZKQ 19kHz -50dB (-35dB, IHF)
SIN at rated power (89) 38kHz -50dB(-55dB, IHF)
PHONO 70dB ('HF, AI 5MB) Channel balance (250Hz-6.3kHz) $1.5dB
CD, TAPE, VCR 1, TVNCR 2 75dB (IHF, A: 85dB) Limiting point 1,2uv
Tone controls Bandwidth
BASS 50Hz, +10 to -10dB IF amplifier 160kHz
TREBLE 20kHz, +10 to -10dB FM demodulator 1000kHz
Output voltage Antenna terminal(s) 759 (unbalanced)
VCR1 our, TAPE REC (OUT) 200mV

Technics®

© 1996 Malsushila Electronics (S) Pte, Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law,

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s -EX500

information by anyone else could result in serious injury or death.

(I: WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain
warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should
be serviced or repaired only by experienced professional technicians. Any attempt to sen/ice or repair the product or products dealt with in this service

I AM Tuner Section
Frequency range
MW 522 - 161 1 kHz (9kHz steps)
530 - 1620kHz (1 OkHz steps)
LW 144 - 288kHz
Sensitivty
mw 201.1V, ssopwm
LW 45w
Selectivity
MW (at 999kHz) 55dB
LW (at 252kHz) 55dB
Image rejection
MW (at 999kHz) 40dB
LW (at 252kHz) 40:13
IF rejection
MW (at 999kHz) 55dB
LW (at 252kHz) 55dB
I Contents
PAGE
' PROTECTION CIRCUITRY ......................................................... 2
0 BEFORE REPAIR AND ADJUSTMENT. ..
- CAUTION FOR AC MAINS LEAD... 3

- OPERATION CHECKS AND MAIN COMPONENT REPLACEMENT 4 ~ 8
FAN MOTOR TROUBLESHOOTING.
' TROUBLESHOOTING
0 BLOCK DIAGRAM .....
- TERMINAL FUNCTIONS OF ICs .............................................. 1.8

I Protection Circuitry

The protection circuitry may have operated if either of the follow-
ing 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.

I Before Repair and Adjustment

I Video Section
Output voltage at 1 V input (unbalanced) 1i0.1 Vp-p
Maximum input voltage 1 .5 Vp-p

Input/output impedance 75 £2 (unbalanced)

I General

Power consumption 230W
Power supply AC 230 -- 240V. 50Hz
Dimensions (W x H x D) 430 x 136 x 358 mm
Weight 9.3 kg
Notes :

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

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

- PAGE
- TERMINAL GUIDE OF ICs, TRANSISTORS & DIODESJB & 19
- SCHEMATlC DIAGRAM...
- PRINTED CIRCUIT BOARD .
° WIRE CONNECTION DIAGRA
- CABINET PARTS LOCATION...
- REPLACEMENT PARTS LIST..
' RESISTORS & CAPACITORS .......................................... 47 ~ 51
- PACKAGING ............................................................................. 52

D

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.

Disconnect AC power, discharge 4 Power Supply Capacitors C703, C704, C705 and C706 through a 109 , 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.

Current consumption at AC 230 V, 50Hz in N0 SIGNAL mode should be 120 ~ 350 mA.

Current consumption at A0 240 V, 50Hz in NO SIGNAL mode should be 130 ~ 380 mA.