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US Model

Canadian Model

E Model

MICROFILM

— Continued on next page —

(Center)              (Rear)            (L-ch)           (R-ch)

This unit is composed of the front speaker and the following units.

REAR SPEAKER

EXTERNAL CENTER SPEAKER

SS-SR171

SS-CN15AV

— 2 —

!

!

!

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2-1.

Removal Amplifier Block ··················································· 5

3-1.

Circuit Boards Location ····················································· 6

3-2.

Schematic Diagram —Dolby Section — ··························· 7

3-3.

Printed Wiring Board —Dolby Section — ························· 9

3-4.

Schematic Diagram —Display Section — ······················· 11

3-5.

Printed Wiring Board —Display Section — ···················· 13

3-6.

Schematic Diagram —Power Section — ························· 15

3-7.

Printed Wiring Board —Power Section — ······················ 17

3-8.

Schematic Diagram —Power Transformer Section — ···· 19

3-9.

Printed Wiring Board —Power Transformer Section — ·· 21

3-10. Printed Wiring Board —Main Section — ························ 23
3-11. Schematic Diagram—Main Section (1/2) — ··················· 25
3-12. Schematic Diagram —Main Section (2/2)  — ················· 27
3-13. IC Pin Function ································································ 29
3-14. IC Block Diagrams ··························································· 30

4-1.

System (L) Assy ······························································· 32

4-2.

System (R) Assy ······························································· 33

4-3.

Amplifier Section ····························································· 34

4-4.

Rear Speaker Section ························································ 35

4-5.

Center Speaker Section ···················································· 36

······································· 37

    After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.

    The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers).
Leakage current can be measured by any one of three methods.

1.

A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2.

A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3.

Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

To Exposed Metal 
Parts on Set

0.15

µ

F

1.5k

Ω

AC
voltmeter
(0.75V)

Earth Ground

Fig. A.  Using an AC voltmeter to check AC leakage.

— 3 —

When the AC plug is inserted to the power outlet with pressing the
MASTER VOL +  button and  S.WOOFER  button displayed model
name, after the all fluorescent indicator tubes light.

1. Pull out the AC plug from the power outlet and turn the power

OFF.

2. Connect the lead wire to TP3 and TP4 on the KEY board.
3. Insert the AC plug to the power outlet and set to STANDBY

mode.

4. Let the lead wire short TP3 and TP4.
5. Fluorescent indicator tube displayed “KEY CHK 29” , and enter

the key check mode.

6. Pressing any buttons, the number of button will be displayed on

the fluorescent indicator tube.

7. After all buttons are pressed, it will be in the STANDBY mode.

Note:

1. The LED (D505)lights while pressing each button.

The LED lights in red when even number of buttons are pressed,
and it lights in green when odd number of buttons are pressed.

2. The LED lights even when the pressed button is pressed again.

CN552

IC513

TP2 TP4

TP1 TP3

S505

S506

Button

I / u
MASTER VOL –
MASTER VOL +
INPUT
SURROUND
CENTER MODE
S.WOOFER

Button Number

1
2
3
4
5
6
7

LED Color

Red

Green

Red

Green

Red

Green

Red

1. Pull out the AC plug from the power outlet and turn the power

OFF.

2. Connect the lead wire to TP1 and TP2 on the KEY board.
3. Insert the AC plug to the power outlet and set to STANDBY

mode.

4. Let the lead wire connected TP1 and TP2.
5. Fluorescent indicator tube displayed “AMP CHK 29” or “AMP

CHK 59”, and enter the amp check mode.

6. The chek step advances in order as TP1 and TP2 are shorted.
7. To exit the test mode, disconnect the AC plug from power outlet.

AMP CHK 29 or 59
AMP CHK 1
AMP CHK 2
AMP CHK 3
AMP CHK 4
AMP CHK 5
AMP CHK 6
AMP CHK 7
AMP CHK 8
AMP CHK 9
AMP CHK 10
AMP CHK 11
AMP CHK 12
AMP CHK 13

STEP

0
1
2
3
4
5
6
7
8
9

10
11
12
13

INPUT

1
1
1
1
1
1
1
1
1
1
2
2

5.1

2

SW MODE

1

OFF
OFF
OFF
OFF
OFF
OFF
OFF

1
2
1
1
1
1

SUR MODE

PRO LOGIC

OFF
OFF
OFF

PRO LOGIC
PRO LOGIC
PRO LOGIC

GAME

OFF
OFF

PRO LOGIC
PRO LOGIC

–

PRO LOGIC

BASS

0
0

–5
+5
–5
+5

0
0
0
0
0
0
0
0

TREBLE

0
0

–5

+5

–5

+5

0
0
0
0
0
0
0
0

VOL

MIN

MAX
MAX
MAX
MAX
MAX
MAX
MAX

MIN

MAX
MAX
MAX
MAX
MAX

* The step 13 is the AUTO POWER ON/OFF check.

*

— 4 —

1

LEFT CHANNEL SPEAKER/CENTER

CHANNEL WOOFER

2

CENTER CHANNEL TWEETERS

3

RIGHT CHANNEL SPEAKER/CENTER

CHANNEL WOOFER

4

SUPER WOOFER

5

REAR SPEAKER

6

EXTERNAL CENTER SPEAKER

1

2

3

4

4

5

2

6

REMOTE COMMANDER

FRONT SPEAKER (L-CH)