Page 1
SC-HM900 I
~
'"
"""'"
Lh WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general
publico
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to
service a product. Producís powered by electricity should be serviced or repaired only by experienced professional
technicians. Any attempt to service or repair the porduct or producís dealt with in this service information by anyone
else could result in serious injury or death. ~
CONTENTS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
page
Safety Precaution 3
Before Repair and Adjustment 4
Protection Circuitry 4 Accessories 4
Handling Precautions For Traverse Deck 5 Precaution of Laser Diode ' 6
Operation Procedures """"""" 7
Operation Checks and Main Component Replacement Procedures 9
Self-Diagnostic Function """""' 17
Descriptionof ErrorCede """""""" 18 Cd Test Mode Function """"""""""" 19
Measurements and Adjustments """"""' 20
lIIustration of IC, Transistors and Diodes : 23 Terminal Function of IC 24
Block Diagram "" 27
Schematic Diagram 35 Printed Circuit Board 48
Wiring Connection Diagram """""""' 59
TroubleshootingGuide """""""""" 60
París Location and Replacement París List 61
~
~
- 2-
-
P SPEAKERS INPUT DIMENSIONS WEIGHT
IMPEDANCE (b x h x 1)
SB-HM900FRONT 355 x 560 x 340 mm 9,2 Kg aprox. Super Tweeter 3cm --- --- -- -
Tweeter 6cm --- -- - ---
Woofer 17 cm - -- -- - ---
Super Woofer 30 cm - -- --- -- -
(high) 612 --- -- -
(Iow) 612 --- -- -
SB-PS70SURROUND
FuI! Range 8 cm 812 170 x 106 x 118 mm 0,9 Kg aprox.
SB-PC70CENTER 812 250x121 x147mm 1,6 Kg aprox. Tweeter 6cm Woofer 10 cm A
Page 2
,.-.
,.....
,......
,......
r---
1SC-HM900
1 Safety Precaution
1.
2.
3.
4-
5.
Before Servicing, unplug the power cord to prevent an electric shock.
When replacing parts, use only manufacture's recommended components for safety.
Check the condition of the power cardo Replace if wear or damage is evident.
After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
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.
1.1 Insulation Resistance Test
1.
2.
3.
Unplug the power cord and short the two prongs of the plug with a jumper wire.
Turn on the power switch.
Measure the resistance value with ohmmeter between the jumper AC plug and each exposed metal cabinet part, such
as screwheads, antenna, control shafts, handle brackets, etc.
Equipment with antenna terminals should read between 3MQ and 5.2MQ to all 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 designoThese 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.
Exposedmetal,./'/
par!
Fig.1
Resistance ==3MO - 5.2MO
Exposedmetal/'par!
Fig-:2
Resistance== Approx 00
- 3-
