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US Model

MICROFILM

Manufactured under license from Dolby Laboratories
Licensing Corporation.
“Dolby” “Pro Logic” and the double-D symbol 

a

 are

trademarks of Dolby Laboratories Licensing
Corporation.

— Continued on next page —

(8 ohms at 40 Hz - 20 kHz less than 0.5% total
harmonic distortion)
60 W + 60 W

(8 ohms at 1 kHz, THD 0.5%)
Front: 60 W/ch
Center: (Pro Logic Mode)
60 W
Rear: 60 W/ch

PHONO: RIAA
equalization curve ±0.5 dB
TV/DBS, CD, TAPE/MD, VIDEO INPUT
10 Hz - 50 kHz ±1 dB

2.5 mV

50 Kilohms

72 dB*

(A, 2.5 mV)

CD

400 mV

TAPE/MD,

250 mV

TV/DBS,

50 Kilohms

82 dB*

VIDEO

(A, 150 mV)

*78 IHF

TAPE/MD REC OUT:

Voltage: 150 mV,
Impedance: 10 kilohms

VIDEO AUDIO OUT:

Voltage: 150 mV,
Impedance: 10 kilohms

PHONES:

Accepts low and high impedance headphones

Full mute

+10 dB at 70 Hz

±8 dB at 100 Hz and 10 kHz

87.5 - 108.0 MHz

75 ohms, unbalanced
300 ohms, balanced

Mono: 18.3 dBf, 4.5 

µ

V

Stereo: 38.3 dBf, 45 

µ

V

11.2 dBf, 2 

µ

V (IHF)

Mono: 76 dB
Stereo: 70 dB

Mono: 0.3%
Stereo: 0.59%

45 dB at 1 kHz

+0.5

30 Hz - 15 kHz

–2

   dB

60 dB at 400 kHz

531 - 1710 kHz

Loop antenna

50 dB/m (at 1,000 kHz)

54 dB (at 50 mV/m)

0.5% (50 mV/m, 400 kHz)

At 10 kHz: 40 dB

— 2 —

Location and Function of controls ················································ 3

····························································

5

3-1.

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

3-2.

Printed Wiring Board (Display Section) ···························· 7

3-3.

Schematic Diagram (Display Section) ······························· 9

3-4.

Printed Wiring Board (Volume Section) ··························· 11

3-5.

Schematic Diagram (Volume Section) ····························· 13

3-6.

Printed Wiring Board (Main Section) ······························ 15

3-7.

Schematic Diagram (Main (1/3) Section) ························ 17

3-8.

Printed Wiring Board (Power Section) ····························· 19

3-9.

Schematic Diagram (Main (2/3), Power Section ) ··········· 21

3-10. Schematic Diagram (Main (3/3), SP SW Section ) ·········· 23
3-11. IC Pin Function ································································ 25
3-12. IC Block Diagrams ··························································· 27

4-1.

Front Panel Section ·························································· 29

4-2.

Chassis Section ································································· 30

································

31

Tuner section:
PLL quartz-locked digital synthesizer system
Preamplifier section:
Low-noise NF type equalizer
Power amplifier section:
Pure-complementary SEPP

120 V AC, 60 Hz

150 W

2 switched, total 120 W/1A Max

17 

×

 5 

7

/

8

 

×

 11 

5

/

8

 inches

(430 

×

 145 

×

 295 mm)

14 IB  5 oz (6.5 kg)

FM wire antenna (1)
AM loop antenna (1)
Remote controller (remote) (1)
Size AA (R6) batteries (2)

Design and specifications are subject to change without notice.

!

!

    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 —

1

POWER switch (I/

u

)

2

CENTER LEVEL +, – buttons

3

REAR LEVEL +, – buttons

4

PRO LOGIC indicator

5

C. STUDIO indicator

6

HALL indicator

7

VIDEO FUNCTION button

8

TV/DBS FUNCTION button

9

TAPE/MD FUNCTION button

0

MASTER VOLUME control

!¡

BALANCE control

!™

TREBLE control

!£

BASS control

!¢

BASS BOOST button/indicator

!∞

SURROUND ON/OFF button

!§

MODE button

!¶

SET UP button

!•

EFFECT/DELAY TIME button

!ª

PHONO FUNCTION button

@º

TUNER FUNCTION button

@¡

CD FUNCTION button

@™

DIRECT button

@£

SHIFT button

@¢

Numeric buttons

@∞

PRESET TUNING +, – buttons

@§

MEMORY button

@¶

AM button

@•

FM button

@ª

FM MODE button

#º

TUNING +, – buttons

#¡

PHONES jack

#™

SPEAKERS A/B switch

1

2 3 4 5 6

7 8 9

!º

@§

@•

#º

#™

#¡

!¡

!™

!∞

!¶ !§

@º !ª

@¡

@™

@£

@¢

@∞

@¶

@ª

!£

!¢

!•

— 4 —

1

y

 SIGNAL GND

2

AC OUTLET

3

AC power cord

4

FRONT SPEAKERS (A/B)

5

SURROUND SPEAKERS (CENTER)

6

SURROUND SPEAKERS (REAR)

7

VIDEO

8

TV/DBS

9

TAPE/MD

!º

CD

!¡

PHONO

!™

ANTENNA (AM/FM)

1

2

!¡

!º

!™

9

5

4

3

7

6

8