Technics SAEX 510 Service Manual

Page 2

SA-EX510

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

[IX 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 service or repairthe product or products dealt with in this service

I AM Tuner Section
Frequency range
AM 522 - 1611kHz (9kHZ steps)
530 - 1620kHz (10kHz steps)
Sensitivty 20w, 330pV/m
Selectivity (at 999kHz) 55dB
Image rejection (at 999kHz) 40dB
IF rejection (at 999kHz) 55dB
I Video Section
Output voltage at 1 V input (unbalanced) 1:0.1 Vp-p
Maximum Input voltage 1.5 Vp-p
Input/output impedance 75 Q (unbalanced)
I Contents
PAGE
. BEFORE REPAIR AND ADJUSTMENT ...................................... 2

c PROTECTION CIRCUITRY .......
° CAUTION FOR AC MAINS LEAD
' OPERATION CHECKS AND MAIN COMPONENT REPLACEMENT 4 ~ 8
0 FAN MOTOR TROUBLESHOOTING

- TROUBLESHOOTING ......................
- BLOCK DIAGRAM ............................................................. 14 ~ 17
0 TERMINAL FUNCTIONS OF ICs .............................................. 18

I Before Repair and Adjustment

I General
Power consumption 180W
Power supply
for E, EG area AC 230V, 50Hz
for EB area AC 230-240V, 50HZ
Dimensions (W x H x D) 430 x 158 x 312 mm
Weight 8.8 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 & DIODES..18 & 19
- SCHEMATIC DIAGRAM... 19 ~ 32
0 PRINTED CIRCUIT BOARD .. 33 ~ 39

0 WIRE CONNECTION DIAGRAM
- CABINET PARTS LOCATION.
- REPLACEMENT PARTS LIST
0 RESISTORS & CAPACITORS
0 PACKAGING"

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.

I 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 tumed oft and then on again.