Sharp QT-222WS User manual

QT-222W
– 1 –
CONTENTS
Page
SPECIFICATIONS ............................................................................................................................................................. 2
VOLTAGE SELECTION..................................................................................................................................................... 2
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ................................................................................................. 2
NAMES OF PARTS ........................................................................................................................................................... 3
HOW TO SET THE POINT "0" ON TUNER DIAL MEMORY............................................................................................. 3
DISASSEMBLY.................................................................................................................................................................. 4
REMOVING AND REINSTALLING THE MAIN PARTS..................................................................................................... 5
ADJUSTMENT ................................................................................................................................................................... 6
NOTES ON SCHEMATIC DIAGRAM ................................................................................................................................ 9
TYPES OF TRANSISTOR ................................................................................................................................................. 9
VOLTAGE .......................................................................................................................................................................... 9
SCHEMATIC DIAGRAM .................................................................................................................................................. 10
WIRING SIDE OF P.W.BOARD....................................................................................................................................... 12
PARTS GUIDE/EXPLODED VIEW
SERVICEMANUAL
SHARP CORPORATION
No. SX376QT222W//
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
• In the interests of user-safety the set should be restored to its
originalconditionandonlypartsidenticaltothosespecifiedshould
be used.
QT-222W(BK)
RADIO CASSETTE RECORDER
MODEL
QT-222W(S)
RADIO CASSETTE RECORDER
MODEL

QT-222W
– 2 –
AC 110-127/220-240 V, 50/60 Hz
DC 6 V [“D” size (UM/SUM-1, R20 or HP-2) battery x 4]
7 W
MPO: 3 W (AC operation, 10 % T.H.D.)
RMS: 1.5 W (DC operation, 10 % T.H.D.)
9.2 cm (3-5/8”) full range speaker x 1
Earphone: 16-50 ohms (recommended: 32 ohms)
Width: 305 mm (12”)
Height: 155 mm (6-1/8”)
Depth: 120 mm (4-3/4”)
1.48 kg (3.3 lbs.) without batteries
General
Power source
Power consumption
Output power
Speaker
Output terminal
Dimensions
Weight
FM: 88 - 108 MHz
SW1: 2.3 - 7.3 MHz
SW2: 7.3 - 22 MHz
MW: 526.5 - 1,606.5 kHz
Radio
Frequency range
Tape recorder
Frequency response
Signal/noise ratio
Wow and flutter
Motor
Bias system
Erase system
60 - 12,000 Hz (Normal tape)
40 dB
0.3 % (WRMS)
DC 6 V electric governor
DC bias
Magnet erase
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
SPECIFICATIONS
VOLTAGE SELECTION
92L24801600292
92L24801800222
92L26802125120
92L26802125210
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
Before operating the unit on mains, check the preset voltage. If the voltage is different from your local voltage, adjust the voltage
as follows. Slide the selector with a screwdriver to the appropriate voltage number. (AC 110 - 127 V or AC 220 - 240 V)
Specifications for this model are subject to change without prior notice.

QT-222W
– 3 –
NAMES OF PARTS
Figure 3
1. Earphone Socket
2. Built-in Microphone
3. Function Switch
4. Band Selector
5. Fine Tuning Control
6. Volume Control
7. Tuning Control
8. Pause Button
9. Stop/Eject Button
10. Cassette Compartment
11. Fast Forward Button
12. Rewind Button
13. Play Button
14. Record Button
15. Battery Compartment
16. AC Input Socket
17. AC Voltage Selector
18. FM/SW Telescopic Rod Aerial
1
8 9 10 11 12 13 14
23 45 6 7
15 16 17 18
HOW TO SET THE POINT "0" ON TUNER DIAL MEMORY
Screw(612)
ø3x12mm
Dial Pointer(219)
Tuning Bracket
(214)
"0" Point Tape Mechanism Front Cabinet
Tuning Knob
(230)
Main PWB
A
1) Firstly, remove the front cabinet.
2) Remove 2 screw from tuning bracket.
3) rotate tuning knob until end of right side (same as arrow
direction A ).
4)Attachthedialpointerslotinsidethetuningbracketproperly
as shown by arrow.
5) Ensure the dial pointer's step must touch the pointer cover
this point to adjust and set the dial pointer for tuning
adjustment purpose.
6)Fittingthetuningbracket(afterassembledwithdialpointer)
to the tuning knob.

QT-222W
– 4 –
1 Rear Cabinet 1. Screw ................... (A1) x5 4-1
2. Socket .................. (A2) x1 4-2
2 Tape Mechanism 1. Screw ................... (B1) x2 4-2
2. Tuning Bracket..... (B2) x1
3. Tuning Knob......... (B3) x1
4. Screw ................... (B4) x2
5. Socket .................. (B5) x2
3 Main PWB 1. Knob ..................... (C1) x2 4-3
2. Screw ................... (C2) x7
3. Tip ........................ (C3) x1
4. Socket .................. (C4) x1
4 Power PWB 1. Screw ................... (D1) x2 4-3
DISASSEMBLY
STEP REMOVAL PROCEDURE FIGURE
Figure 4-3
Figure 4-2
Caution on Disassembly
Followthebelow-mentionednotes when disassembling the
unitandreassemblingit,tokeepitsafeandensureexcellent
performance:
1. Take cassette tape out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need to
beremovedwhen disassemblingtheunit. Afterservicing
the unit, be sure to rearrange the leads where they were
before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
Figure 4-1
(A1)x5
ø3x25mm
Front Cabinet
Rear Cabinet
(D1)x2
ø3x10mm
(C4)x1
(C1)x1
(C1)x1
(C3)x1
(C2)x7
ø3x10mm
Power PWB
Main PWB Front Cabinet
(B2)x1
(B5)x1
(A2)x1
(B5)x1
(B3)x1
(B1)x2
ø3x8mm
(B4)x2
ø3x8mm
Tape
Mechanism
Front Cabinet

QT-222W
– 5 –
TAPE MECHANISM SECTION
Performsteps1to2ofthedisassemblymethodtoremovethe
tape mechanism. (See page 4.)
How to remove the record / playback and erase
heads (See Fig. 5-1.)
1. Remove the screws (A1) x 2 pcs., to remove the record/
playback head.
2.Removethe hooks (A2)x2 pcs.,towardthe center position
as shown in Fig. 5-1. and then extract the erase head
upward.
Note:
After replacing the heads and performing the azimuth
adjustment, be sure to apply screwlock.
Figure 5-1
Figure 5-3
REMOVING AND REINSTALLING THE MAIN PARTS
(A1)x2
ø2x7mm
Record/Playback
Head
Hook
(A2)x2
Erase Head
PLAY
Button
Push
Lug Wire
How to remove the belts (See Fig. 5-2.)
1. Remove the main belt (B1) x 1 pc., from the motor pulley.
2. Remove the FF/REW belt (B2) x 1 pc., from the REW/FF
roller.
3. Put on the belts in the reverse order of removal.
Note:
Whenputtingon the belt,ascertainthatthe belt isnottwisted,
and clean it.
How to remove the motor
(See Fig. 5-3.)
1. Remove the main belt. (See Fig. 5-2.)
2. Remove the screws (C1) x 1 pc., to remove the motor
bracket.
3. Remove the screws (C2) x 2 pcs., to remove the motor.
Note:
When mounting the motor, pay attention to the motor bracket
angle.
Motor
REW/FF
Roller
Flywheel
FF/REW Belt
(B2)x1
Main Belt
(B1)x1
Motor Pulley
Motor Bracket
Motor
Motor
(C2)x2
ø2.6x1.6mm
Special Screw
(C1)x1
ø2x4mm
Motor Bracket
Figure 5-2

QT-222W
– 6 –
ADJUSTMENT
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
1 FM IF: (1) FM IF sweep Inject the IF Signal are taken Adjust T106 (1) Band SW in FM.
10.7 MHz generator sweep signal out from point TP3 and repeat to get (2) VOL. & TONE
(T108) (2) Alignment through 300 pF best "S" curve with control in MIN.
FM oscilloscope capacitor to point center at 10.7 MHz position
DETECTION: (3) Power supply TP2 (3) Tune P.V.C. to
(T106) high end
2 FM BAND (1) FM RF sweep Inject the RF Same as step 1 Adjust P.V.C. (TC2) Same as step 1
COVERAGE fH: generator signal directly to get MAX. output
108.2 MHz (2) Alignment point TP1
oscilloscope
(3) Power supply
3 FM BAND Same as step 2 Same as step 2 Same as step 1 Adjust L103 to get Tune P.V.C. to low
COVERAGE fL: MAX. output end
87.4 MHz
4 Repeat step 2, 3 until no further improvement can be made.
5 FM TRACKING Same as step 2 Same as step 2 Same as step 1 Adjust P.V.C. (TC1) to Tune P.V.C. to
fH: 106 MHz get MAX. output 106 MHz
6 FM TRACKING Same as step 2 Same as step 2 Same as step 1 Adjust L102 to get MAX. Tune P.V.C. to
fL: 90 MHz output 90 MHz
7 Repeat step 5, 6 and then step 2, 3, 5, 6 until no further improvement can be made.
Step Alignment
Frequency Test Equipment Signal-in Signal-out Adjust Remark
FM Section
SPEAKER
L109
TC2
TC1
TC4
TC3
Figure 6

QT-222W
– 7 –
1 MW IF: 455 kHz (1) AM IF sweep Let the MW ANT Take out the signal Adjust T105 get MAX. (1) Band SW in MW
generator with coil close to the from point TP4 output at 455 kHz position
loop antenna generator ANT. (2) VOL. control in MIN.
(2) Alignment position
oscilloscope (3) Tune P.V.C. to
(3) Power supply high end
2 MW (1) MW sweep Same as step 1 Same as step 1 Adjust P.V.C. (TC3) Same as step 1
TRACKING fH: generator with get MAX. output at
1,650 kHz antenna 1,650 kHz
(2) Alignment
oscilloscope
(3) Power supply
3 MW BAND Same as step 2 Same as step 1 Same as step 1 Adjust T101 to get Tune P.V.C. to low
COVERAGE fL: MAX. output at 515 kHz end
515 kHz
4 Repeat step 2, 3 until no further improvement can be made.
5 MW BAND Same as step 2 Same as step 1 Same as step 1 Adjust P.V.C. (TC4) Tune P.V.C. to
COVERAGE fH: get MAX. output at 1.400 kHz
1,400 kHz 1,400 kHz
6 MW TRACKING Same as step 2 Same as step 1 Same as step 1 Adjust L109 get MAX. Tune P.V.C. to
fL: 600 kHz output at 600 kHz 600 kHz
7 Repeat step 5, 6 and then step 2, 3, 5,6 until no further improvement can be made.
Step Alignment
Frequency Test Equipment Signal-in Signal-out Adjust Remark
MW Section
1 SW1 BAND (1) SW1 sweep Let the MW ANT Take out the signal Adjust CT103 get MAX. (1) Band SW in SW1
COVERAGE fH: generator with coil close to the from point TP4 output at 7.4 MHz position
7.4 MHz antenna generator ANT. (2) VOL. control in MIN.
(2) Alignment point TP1 position
oscilloscope (3) Tune P.V.C. to
(3) Power supply high end
2 SW1 BAND Same as step 1 Same as step 1 Same as step 1 Adjust T102 get MAX. Tune P.V.C. to low
COVERAGE fL: output at 2.25 MHz end
2.25MHz
3 Repeat step 1, 2 until no further improvement can be made.
4 SW1 Same as step 1 Same as step 1 Same as step 1 Adjust CT101 get MAX. Tune P.V.C. to 6 MHz
TRACKING fH: output at 6 MHz
6 MHz
5 SW1 Same as step 1 Same as step 1 Same as step 1 Adjust L109 get MAX. Tune P.V.C. to
TRACKING fL: output at 2.6 MHz 2.6 MHz
2.6 MHz
6 Repeat step 4, 5 and then step 1, 2, 4, 5 until no further improvement can be made.
Step Alignment
Frequency Test Equipment Signal-in Signal-out Adjust Remark
SW1 Section
1 SW2 BAND (1) SW2 sweep Inject the RF Take out the signal Adjust CT104 get MAX. (1) Band SW in SW2
COVERAGE fH: generator signal directly to from point TP4 output at 22.5 MHz position
22.5 MHz (2) Alignment point TP1 (2) VOL. control in MIN.
oscilloscope position
(3) Power supply (3) Tune P.V.C. to
high end
2 SW2 BAND Same as step 1 Same as step 1 Same as step 1 Adjust T103 get MAX. Tune P.V.C. to low
COVERAGE fL: output at 7.2 MHz end
7.2 MHz
3 Repeat step 1, 2 until no further improvement can be made.
4 SW2 Same as step 1 Same as step 1 Same as step 1 Adjust CT102 get MAX. Tune P.V.C. to
TRACKING fH: output at 19 MHz 19 MHz
19 MHz
5 SW2 Same as step 1 Same as step 1 Same as step 1 Adjust T104 get MAX. Tune P.V.C. to
TRACKING fL: output at 8.5 MHz 8.5 MHz
8.5 MHz
6 Repeat step 4, 5 and then step 1, 2, 4, 5 until no further improvement can be made.
Step Alignment
Frequency Test Equipment Signal-in Signal-out Adjust Remark
SW2 Section

QT-222W
– 8 –
MECHANISM SECTION
1 Head Playback test tape Connect VTVM and oscilloscope to Head fixing screw Adjust to get MAX.
adjustment MTT-113 6.3 kHz speaker output (see Fig 8-2.) audio output
2 Bias Frequency Record position Connect frequency counter to TP5 and Adjust 80 kHz ±1 kHz
adjustment ground (Bias Oscillation)
3 Beat cancel Record position Same as step 3 SW202 from playback 75 kHz ±0.5 kHz
to record
Step Item Condition Connection Adjust Output
TAPE Section
Figure 8-2
Erase Head
Head fixing
screw Record/
Playback
Head
Tape Mechanism
Figure 8-1 ADJUSTMENT POINTS
MAIN PWB
TC104
T101 T102
TC103
T103
SW202
RECORD/PLAYBACK
T105
ERASE HEAD
RECORD/
PLAYBACK HEAD
TAPE
CN504
M201
TAPE
MOTOR
TAPE MAIN
CNS201
1
2
3
CNP201
1
2
3
4
1234
1234
CNS202

QT-222W
– 9 –
VOLTAGE
NOTES ON SCHEMATIC DIAGRAM
TYPES OF TRANSISTOR
•Resistor:
To differentiate the units of resistors, such symbol as K and
M are used: the symbol K means 1000 ohm and the symbol
M means 1000 kohm and the resistor without any symbol is
ohm-type resistor. Besides, the one with “Fusible” is a fuse
type.
•Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means pico-farad and the unit of the capacitor
without such a symbol is microfarad. As to electrolytic
capacitor, the expression “capacitance/withstand voltage”
is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
• Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
• Parts marked with “ ” ( ) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
•Theindicated voltageineach section istheone measuredby
Digital Multimeter between such a section and the chassis
with no signal given.
SW101 BAND SELECTOR FM—MW—SW1—SW2
SW201 FUNCTION TAPE—RADIO
SW202 RECORD/PLAYBACK REC–P.B.
SW401 VOLTAGE SELECTOR AC 220-240 V—
AC 110-127 V
REF. NO DESCRIPTION POSITION
123456
78 9 10 11 12
13 14 15 16
0.78 0.00 3.03 0.05 1.44 4.18 4.20 4.10 0.00 3.39 1.25 3.50
4.23 4.18 4.20 0.06
0.00 0.00 0.70 0.87 0.02 4.30 4.27 4.34 0.00 3.80 1.60 4.36
0.91 0.90 4.35 4.23
123456
78 9 10 11 12
13 14 15 16
3.90 8.00 3.89 0.00 0.60 0.00 0.00 0.59
EBC
0.02 0.64 1.36
0.00 0.63 1.94
CCBEBECBECBE
0.20 0.90 1.90 7.43 7.13 0.50 4.48 5.13 7.50 0.40 1.10 3.77
LOCATION
Q207: 9102G
LOCATION
PIN NO.
WORK
VOLTAGE
(V)
CD 2003GP (IC1)
FM
MW -SW1-SW2
PSS9014C
LOCATION KA2209 (FULL POWER)(IC201)
PIN NO.
WORK VOLTAGE(V)
PIN NO.
WORK VOLTAGE(V)
PIN NO.
WORK
VOLTAGE
(V)
Q202
Q203
Q205: ZQT8050D Q101: 9018G
LOCATION
Q204:PSS9014
ECB
FRONT
VIEW
9018G
PSS9014C
ZQT8050D
9012G

QT-222W
– 10 –
• NOTES ON SCHEMATIC DIAGRAM can be found on page 9.
A
B
C
D
E
F
G
H
1234 5 6
Figure 10 SCHEMATIC DIAGRAM (1/2)
--++
1234
5678
IC201 92L28402209000 (KA2209)
FM SIGNAL MW/SW1/SW2 SIGNAL
RECORD SIGNAL
PLAYBACK SIGNAL
TC3
SW101
SW101
SW101
SW101
SW101
SW101
SW202
RECORD/
PLAYBACK
SW202
RECORD/
PLAYBACK
SW202
RECORD/
PLAYBACK
SW202
RECORD/
PLAYBACK
SW201
FUNCTION
SW201
FUNCTION
+B

QT-222W
– 11 –
Figure 11 SCHEMATIC DIAGRAM (2/2)
78 9101112
POWER PWB-B
SW401
SO401
AC INPUT
SOCKET
AC POWER
SUPPLY CORD
AC 110-127 V/
220-240 V,
50/60 Hz
AC 220-240 V AC 110-127 V
AM
RF IN
FM
RF IN GND1 FM MIX AM MIX AGC VCC AM
IF IN FM IF IN
FM
RF OUT
FM/AM
SW FM OSC AM OSC FM DET
AM
DET
AM
RF
FM
RF FM
MIX AM MIX AGC AM
IF FM IF
AM/
FM SW FM
OSC AM
OSC DET
OUT QUAD GND2
12345678
910111213141516
-+
234
567
IC BLOCK DIAGRAM
L
28402209000 (KA2209) IC101 9228402003010 (CD2003GP)
SW201
FUNCTION
SW201
FUNCTION
SW201
FUNCTION
HP201
HEADPHONES
+B
+B
+B
+B
+B +B
+B
+B
+B
+B

QT-222W
– 12 –
A
B
C
D
E
F
G
H
1234 5 6
Figure 12 WIRING OF P.W.BOARD (1/2)
SP201
SPEAKER
MW ANA SW1 ANA
MAIN PWB-A
CNP401
FROM
POWER PWB
CNP202
WH
RD
BK
M201
TAPE MOTOR
(245-1)
RD
BK
WH WH WH
TAPE MAIN
BR
BR
CNP201
RD
BK
WH
ERASE
HEAD
(245-3)
RD WH
RECORD/
PLAYBACK
HEAD (245-2)
BK
GND
1
123
2
3
1
2
3
4
8
7
6
5
MIC
12 3 4 5 6 7 8
16 15 14 13 12 1110 9
C137
PVC
L109
EBC
CCBE
CBE
C
C
B
E
BE
E
B
C
E
B
C
BE
TC2 TC1
VC2
VC4
VC1
VC3
CT3
CT4

QT-222W
– 13 –
Figure 13 WIRING OF P.W.BOARD (2/2)
78 9101112
CNS401
TO
MAIN PWB
AC POWER
SUPPLY CORD
AC 110-127 V/
AC 220-240 V,
50/60 Hz
SO401
AC INPUT
SOCKET
AC 110-127 V/
AC 220-240 V,
50/60 Hz
RD
RD RD
RD
RD
BK
BK
BK
SW401
VOLTAGE SELECTOR
AC 220 V-240 V AC 110 V-127 V
RD RD
BL
T401
POWER
TRANSFORMER
WH
WH
WH
WH
RD
BL
BK
BR
COLOR TABLE
RD(R)
OR
YL
GR
BL
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VL
GY
WH(W)
BK
PK
VIOLET
GRAY
WHITE
BLACK
PINK
BATTERIES
DC 6 V [“D” size
(UM/SUM-1, R20 or HP-2)
battery x 4]
F1
T 1.25A L 250 V
POWER-B
(240) (238) (239)

QT-222W
– 14 –
–– MEMO ––

QT-222W
PARTS GUIDE
NOTE:
Parts marked with “ ” are important for maintaining the safety of the set.
Besuretoreplacepartswithspecifiedonesformaintainingthesafetyandperformanceoftheset.
“HOW TO ORDER REPLACEMENT PARTS”
To have your order filled promptly and correctly, please furnish the
following information.
1. MODEL NUMBER 2. REF. No.
3. PART NO. 4. DESCRIPTION
MARK: SPARE PARTS-DELIVERY SECTION
For U.S.A. only
Contact your nearest SHARP Parts Distributor to order.
For location of SHARP Parts Distributor,
Please call Toll-Free;
1-800-BE-SHARP
Explanation of capacitors/resistors parts codes
Capacitors
VCC ....................... Ceramic type
VCK........................ Ceramic type
VCT........................ Semiconductor type
VC • • MF ............... Cylindrical type (without lead wire)
VC • • MN............... Cylindrical type (without lead wire)
VC • • TV................ Square type (without lead wire)
VC • • TQ ............... Square type (without lead wire)
VC • • CY ............... Square type (without lead wire)
VC • • CZ ............... Square type (without lead wire)
VC • • • • • • • • • J .. The 13th character represents capacity difference.
("J" ±5%, "K" ±10%, "M" ±20%, "N" ±30%,
"C" ±0.25 pF, "D" ±0.5 pF, "Z" +80-20%.)
If there are no indications for the electrolytic capacitors, error is ±20%.
Resistors
VRD ....................... Carbon-film type
VRS........................ Carbon-film type
VRN ....................... Metal-film type
VR • • MF ............... Cylindrical type (without lead wire)
VR • • MN............... Cylindrical type (without lead wire)
VR • • TV................ Square type (without lead wire)
VR • • TQ ............... Square type (without lead wire)
VR • • CY ............... Square type (without lead wire)
VR • • CZ ............... Square type (without lead wire)
VR • • • • • • • • • J .. The 13th character represents error.
("J" ±5%, "F" ±1%, "D" ±0.5%.)
If there are no indications for other parts, the resistors are ±5%
carbon-film type.
MODEL QT-222W(S)
RADIO CASSETTE RECORDER
MODEL QT-222W(BK)
RADIO CASSETTE RECORDER