Technics ST HD 505 Service Manual

Page 2

A 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 repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

CONTENTS
Page
.2

1 Before Repair

2 Blue LED

3 Operating Instructions 3
4 About the Self-Diagnostic Made ------------------------------------------- 5
5 Power Source ON/OFF and Signal Check ------------------------------ 6
6 Operation Checks and Component Replacement Procedures?
7 Wiring Connection Diagram --------------------------------------------------- 8
8 Block Diagram ------------------------------------------------------------------------ 9

---12

9 Schematic Diagram Notes -------

9.1. Schematic Diagram Notes ,

1 Before Repair

This equipment (ST-HDSOS). which is a component of the
system, is supplied with power from the amplifier (SE-
HD505).When repairing this equipment or checking operation

2 Blue LED

9.2. Type Illustration of I05 Transistors and Diodes-
10 Schematic Diagram
11 Printed Circuit Board Diagram.

12 Terminal Function of IC's ----------------------------------------------------- 26
12.1. |C302(M62433AFP): DIGITAL SOUND CONTROLLER"26
12.2. |C701(M30218MAA101): FL DRIVE/SYSTEM CONTROL

................................................................................... 27
13 Replacement Parts List -------------------------------------------------------- 28
14 Cabinet Parts Location --------------------------------------------------------- 31

of the system, be sure to connect the amplifier with it.

Power supply and operation check in the state of it as a single
equipmenet are impracticable.

o The LED mounted to each side of the front panel of this set is very sensitive to static electricity.When handling the LED base

plate, be very careful about it.

0 Do not replace a blue LED singly. If replaced singly, it may be subject to electrostatic breakdown or deterioration in quality.
When replacing the LED base plate, be sure to replace L and R sides simultaneously to permit the brightness adjustment.

*Fcr configuration at the time of supply of replacement parts, refer to Printed Circuit Board Diagram".