Sharp qt cd 111 service manual

Page 1

QT-CD111/111C

SHARP SERVICE MANUAL

No. S38190TCD111/

QT-CD1 11
QT-CD111C

Illustration: OT-CD111 - In the interests oi user-safety the set should be restored to its
COM my original condition and only parts identical to those specified should
E |D§@ be used.

DIGITAL AUDIO

CONTENTS

IMPORTANT SERVICE NOTES (FOR QT-CD1 11 ONLY).
SPECIFICATIONS.
NAMES OF PARTS
DISASSEMBLY ..........
REMOVING AND REINSTALLING THE MAIN PARTS
ADJUSTMENT .......
BLOCK DIAGRAM
SCHEMATIC DIAGRA
NOTES ON SCHEMATIC DIAGRAM .
TYPES OF TRANSISTOR ...........
WAVEFORMS OF CD CIRCUIT ..
TROUBLESHOOTING (CD SECTION) .
FUNCTION TABLE OF IC ......................
PARTS GUIDE/EXPLODED VIEW

PACKING OF THE SET (FOR CIT-CD111 ONLY)

This document has been published to be used
SHARP CORPORATION for after sales service only.

The contents are subject to change without notice.

Page 2

QT-CD111/111C

TO THE OPERATION MANUAL.

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT. PLEASE REFER

IMPORTANT SERVICE NOTES (FOR QT-CD111 ONLY)

BEFORE RETURNING THE AUDIO PRODUCT

(Fire & Shock Hazard)

Before returning the audio product to the user. perform the

following safety checks.

1. Inspect all lead dress to make certain that leads are not
pinched orthat hardware is not lodged between the chassis
and other metal parts in the audio product.

2. Inspect all protective devices such as insulating materials.
cabinet. terminal board, adjustment and compartment
covers or shields, mechanical insulators etc.

3. To be sure that no shock hazard exists. check for leakage

current in the following manner.

Plug the AC line cord directly into a 120 volt AC outlet.

Using two clip leads. connect a 1.5k ohm, 10 watt resistor
paralleled by a 0.15uF capacitor in series with all exposed
metal cabinet parts and a known earth ground. such as
conduit or electrical ground connected to earth ground.
Use a VTVM or VOM with 1000 ohm per volt, or higher,
sensitivity to measure the AC voltage drop across the
resistor (See diagram).

Connect the resistor connection to all exposed metal parts
having a return path tothechassis (antenna. metal cabinet.
screw heads. knobs and control shafts. escutcheon. etc.)
and measure the AC voltage drop across the resistor.

3 s

TS

VTVM
-OAC SCALEO-

1.5k ohms
10W

0.15uF

TEST PROBE
TO EXPOSED CONNECT TO
METAL PARTS KNOWN EARTH
GROUND

AllcheckmustberepeatedwiththeAClinecord plug connection
reversed.

Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp.
AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the audio
product to the owner.

SPECIFICATIONS

0 General
Power source: AC 120V. 60 Hz

DC 12 V [ D" size (UM/SUM-1,
R20 or HP-2) battery x 8]

20 W

FTC; 2.0 W min. RMS per channel
into 8 ohms from 150 Hzto 20 kHz,
with no more than 10 % total harm-
onic distortion.

RMS; 2.3 W (1.65 W +1.65 W)
(DC operation. 10 % T.H.D.)
RMS; 2.3 W/CH

Power consumption:
Output power:
(1 11)

Output power:

(111C) (DC operation. 10 % T.H.D.)
Speakers: 4" (10 cm) full-range speaker x 2
Dimensions: Width; 18-15/16" (480 mm)
Height; 6-1/16" (153 mm)
Depth; 10" (254 mm)
Weight: 7.1 lbs. (3.2 kg) without batteries
O Radio

FM; 87.6 - 108 MHZ
AM; 530 -1,702 kHz

Frequency range:

.Tape recorder
Frequency response:
Signal/noise ratio:
Wow and flitter:
Motor:

Bias system:

Erase system:

50 - 14.000 Hz (Normal tape)
50 dB

0.25 % (WRMS)

DC 12 V electric governor
AC bias

Magnet erase

OCompact disc player

Disc: Compact disc

Signal readout: Non-contact, 3-beam semi-
conductor laser pickup

2

16-bit linear quantization

4-tims oversampling digital filter
1-bit D/A converter
Unmeasurable

(less than 0.001% W. peak)

Audio channels:
Quantization:
Filter:

D/A converter:
Wow and flutter:

Specifications for this model are subject to change without
prior notice.

Page 2

QT-CD111/111C

TO THE OPERATION MANUAL.

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT. PLEASE REFER

IMPORTANT SERVICE NOTES (FOR QT-CD111 ONLY)

BEFORE RETURNING THE AUDIO PRODUCT

(Fire & Shock Hazard)

Before returning the audio product to the user. perform the

following safety checks.

1. Inspect all lead dress to make certain that leads are not
pinched orthat hardware is not lodged between the chassis
and other metal parts in the audio product.

2. Inspect all protective devices such as insulating materials.
cabinet. terminal board, adjustment and compartment
covers or shields, mechanical insulators etc.

3. To be sure that no shock hazard exists. check for leakage

current in the following manner.

Plug the AC line cord directly into a 120 volt AC outlet.

Using two clip leads. connect a 1.5k ohm, 10 watt resistor
paralleled by a 0.15uF capacitor in series with all exposed
metal cabinet parts and a known earth ground. such as
conduit or electrical ground connected to earth ground.
Use a VTVM or VOM with 1000 ohm per volt, or higher,
sensitivity to measure the AC voltage drop across the
resistor (See diagram).

Connect the resistor connection to all exposed metal parts
having a return path tothechassis (antenna. metal cabinet.
screw heads. knobs and control shafts. escutcheon. etc.)
and measure the AC voltage drop across the resistor.

3 s

TS

VTVM
-OAC SCALEO-

1.5k ohms
10W

0.15uF

TEST PROBE
TO EXPOSED CONNECT TO
METAL PARTS KNOWN EARTH
GROUND

AllcheckmustberepeatedwiththeAClinecord plug connection
reversed.

Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp.
AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the audio
product to the owner.

SPECIFICATIONS

0 General
Power source: AC 120V. 60 Hz

DC 12 V [ D" size (UM/SUM-1,
R20 or HP-2) battery x 8]

20 W

FTC; 2.0 W min. RMS per channel
into 8 ohms from 150 Hzto 20 kHz,
with no more than 10 % total harm-
onic distortion.

RMS; 2.3 W (1.65 W +1.65 W)
(DC operation. 10 % T.H.D.)
RMS; 2.3 W/CH

Power consumption:
Output power:
(1 11)

Output power:

(111C) (DC operation. 10 % T.H.D.)
Speakers: 4" (10 cm) full-range speaker x 2
Dimensions: Width; 18-15/16" (480 mm)
Height; 6-1/16" (153 mm)
Depth; 10" (254 mm)
Weight: 7.1 lbs. (3.2 kg) without batteries
O Radio

FM; 87.6 - 108 MHZ
AM; 530 -1,702 kHz

Frequency range:

.Tape recorder
Frequency response:
Signal/noise ratio:
Wow and flitter:
Motor:

Bias system:

Erase system:

50 - 14.000 Hz (Normal tape)
50 dB

0.25 % (WRMS)

DC 12 V electric governor
AC bias

Magnet erase

OCompact disc player

Disc: Compact disc

Signal readout: Non-contact, 3-beam semi-
conductor laser pickup

2

16-bit linear quantization

4-tims oversampling digital filter
1-bit D/A converter
Unmeasurable

(less than 0.001% W. peak)

Audio channels:
Quantization:
Filter:

D/A converter:
Wow and flutter:

Specifications for this model are subject to change without
prior notice.