SHARP SM1122H SERVICE MANUAL

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SHARP Service Manual

INTEGRATED STEREO AMPLIFIER MODEL SM-1122H

In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used.

SPECIFICATIONS

GENERAL DESCRIPTION

Power source:	a.c. 110/220/240V.
	50/60Hz
Power consumption:	150W
Semiconductors:	1-IC (Integrated circuit)
	15-Transistor	(
	6-Diode
	6-LED (Light Emitting Diode)
Dimensions:	Width: 390mm
	Height: 142mm
	Depth: 257mm
Weight:	5.5kg
MAIN AMPLIFIER		(
Circuit:	Differential amplifier, semicomple-
	mentary system, OCL (Output Capa-
	citor-Less)	F
Music power output (1	kHz):
	2 x 30W/4 ohms, Both channels driven,	I
	0.8% distortion
	2 x 20W/8 ohms, Both channels driven,	I
	0.8% distortion
Continuous power out	put (at 1kHz):
	2 x 20W/4 ohms, Both channels driven,
	0.8% distortion
	2 x 13W/8 ohms, Both channels driven,
	0.8% distortion
Intermodulation distor	rtion:
	0.3% at 5W output

Damping factor: Power bandwidth:

more than 30 (at 1kHz, 8 ohms) 10Hz ~ 25kHz (4 ohms, Both channele driven)

PRE-AMPLIFIER

Circuit:	Direct coupled equalizer circuit 'CR'
on our c.	type tope control
	type tone control
Input sensitivity and in	put impedance:
PHONO:	3mV/50k ohms
AUX.:	150mV/50k ohms
TUNER:	150mV/50k ohms
TAPE:	290mV/50k ohms
MIC:	2mV/600 ohms
Output level and loaded	d impedance:
TAPE REC:	30mV/80k ohms
MIC MIX OUT:	30mV/80k ohms
Phono overload:	200mV
	(RMS, 1kHz, 0.8% THD)
RIAA curve deviation:	30Hz ~ 20kHz
	±1dB
Frequency response:	20Hz ~ 70kHz ±3dB
	(AUX.)
Tone control:
Bass:	±8dB at 100Hz
Treble:	±10dB at 10kHz

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

SHARP CORPORATION OSAKA, JAPAN

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LAYOUT OF FRONT PARTS (Figure 1)

Figure 1

LAYOUT OF REAR PARTS (Figure 2)

Figure 2

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DISASSEMBLY (Refer to Figure 3)

HOW TO REMOVE THE CABINET: Remove the 4 screws ① retaining the cabinet (2 screws each in right and left) and lift up the cabinet to remove it.
HOW TO REMOVE THE FRONT PANEL: Draw out the 6 Knobs (2) from the front panel and remove the 5 screws (3) retaining the front panel. Then pull the front panel toward you to remove it.
HOW TO REMOVE THE BOTTOM PLATE Turn over the set, remove the 4 screws ④ retaining the bottom plate and lift up the bottom plate to remove it.

Figure 3

VOLTAGE SELECTION (Refer to Figure 4)

Check the preset voltage before connecting the AC cord plug to an wall outlet. If the setting is different from your local supply AC voltage, the selector must be reset as follows. Rotate the voltage selector by using a screwdriver so that your local voltage number can be seen.

Figure 4

-3-

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BLOCK DIAGRAM

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EQUALIZER CIRCUIT (Refer to Figure 6)

The equalizer circuit is a two-stage directly coupled amplifier type having a higher gain and it can therefore remarkably lower the distortion factor. Being powered by a two-power supply (+20V and -20V), this circuit provides a better distortion factor characteristic even with a large amount of input. The incoming signal, from the phono input jacks, is fed through the coupling capacitor (C103 or C104) to the

1st-stage transistor (Q101 or Q102), then coming out of the 2nd-stage transistor (Q103 or Q104) to enter the function selector (SW101-A) via the coupling capacitor (C121 or C122). The equalizer NF circuit consists of R117 thru R119. R121, C109, C115 and C117 thru R118, R120, R122, C110, C116 and C118.

TONE CIRCUIT (Refer to Figure 7)

The tone circuit is an attenuator type circuit which comprises transistor (Q105 or Q106), capacitor and resistor.

Being an NPN low-noise type, the transistor (Q105 or Q106) ensures an outstanding signal-to-noise ratio. The signal coming from each of the function selectors (SW101A to SW101F) is passed on, through the fader control (VR101), volume control

(VR102), balance control (VR103) and coupling capacitor (C127 or C128), to the base of the transistor (Q105 or Q106) where it is amplified. Besides, the frequency characteristic of the tone circuit may be varied by using the treble control (VR104) and bass control (VR105) to change the attenuation amount.

Figure 7

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MAIN AMPLIFIER CIRCUIT (Refer to Figure 8)

The main amplifier circuit is a differential one-stage directly coupled, pure complementary dual IC which provides a very lowered distortion factor over a wide range of the band frequencies.

The circuit is initiated by a two-power supply (+24.5V and -24.5V) and the potential of output is kept to 0V. Coming from the tone circuit, the signal is applied through the coupling capacitor (C140 or C141) to the terminals 1 and

16 of the IC, and coming out of the terminals 7 and 10, it is then further supplied to the speaker terminals (TM101 or TM102) via the fuse (F101 or F102). The NF circuit is composed of resistors (R159 and R163, or R160 and R164) and capacitor (C144 or C143); the NF amount for the lower range is determined by the resistors (R159 and C144, or R160 and C143).

Figure 8

IC REPLACEMENT (Refer to Figure 9)

When replacing the power IC with a new one, firstly remove the two screws retaining the power IC and also the power IC's legs from the PWB. Next, sparingly apply silicone grease evenly over the metallic surface of a new power IC, bring the two screws through the retaining holes to fix them to the IC heat sink. After that, solder the IC's legs to the PWB.

Figure 9

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Figure 10 WIRING SIDE OF P.W. BOARD

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Figure 11 SCHEMATIC DIAGRAM

QI05,QI06 2SC900U

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EQUIVALENT OF INTEGRATED CIRCUIT (Figure 13)

Figure 13

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REPLACEMENT PARTS LIST

"HOW TO ORDER REPLACEMENT PARTS"

To have your order filled promptly and correctly, please furnish the following informations.

1. MODEL NUMBER

2. REF. NO.

3. PART NO.

4. DESCRIPTION

REF. NO.	PART NO.	DESCRIPTION	REF. NO.	PART NO.	DESCRIPTION
	INTEGRAT	ED CIRCUITS	VR104 VR105	91TRW-097 91TRW-097	Treble Control Bass Control
IC101	91TSTK043	Power Amp		RESISTORS
TRANSISTORS			(Unless otherwise specified resistors are 1/4W, ±5%, carbon type.)
Q101, Q102 Q103, Q104	91T2SA929F 91T2SC1570G	Equalizer Amp (2SA929F) Equalizer Amp (2SC1570G)	R101, R102, R103, R104	91TRD14PY68KK	68K ohm
Q104 ) Q105,	91T2SC900U	Tone Amp (2SC900U)	R105, ) R106	91TRD14PY1KK	1K ohm
Q107	91T2SA929F	Mic Amp (2SA929F)	R107, R108	91TRD14PY220KK	220K ohm
Q100 Q109 Q110	91T2SC1570G 91T2SA733P 91T2SD438E	Echo Drive (2SD438E)	R109, ) R110 }	91TRD14PY100KK	100K ohm
Q111 Q112	91T2SA733P	Echo Amp (2SC945P)	R111, ) R112	91TRD14PY15KK	15K ohm
Q113 Q114	91T2SC945P 91T2SD438F	Phase Spliter (2SC945P) Bipple Filter (2SD438E)	R113, ) R114 ∫	91TRD14PY470K	470 ohm
Q115	91T2SB560E	Ripple Filter (2SB560E)	R115,) R116	91TRD14PY33KK	33K ohm
	LED (Light	Emitting Diode)	R117, ∖ R118 ∫	91TRD14PY220KK	220K ohm
D101 D102	VHPGL3AR//-1 VHPGL3AR//-1	Mode Switch Indicator Loudness Switch Indicator	R119, R120	91TRD14PY56KK	56K ohm
D103	VHPGL3AR//-1	Function Selector Indicator (PHONO)	R121, ) R122	91TRD14PY18KK	18K ohm
D104	VHPGL3AR//-1	Function Selector Indicator (TUNER)	R123, ) R124 ∫	91TRD14PY8.2KK	8.2K ohm
D105	VHPGL3AR//-1	Function Selector Indicator (TAPE)	R125, R126	91TRD14PY220K	220 ohm
D106	VHPGL3AR//-1	Function Selector Indicator (AUX)	R127, R128	91TRD14PY120KK	120K ohm
	DI	ODES	R129, 1 R130	91TRD14PY1KK	1K ohm
D107.			R133, 1 R134	91TRD14PY10KK	10K ohm
D108 J	91T1S2473	Ripple Filter Control	R135, ) R136	91TRD14PY33KK	33K ohm
D112, D113,	91TGP-20D	Power Rectifier	R139,1 R140	91TRD14PY470K	470 ohm
D114			R141, 1 R142	91TRD14PY560KK	560K ohm
	TRANS	SFORMER	R143, 1 R144	91TRD14PY47KK	47K ohm
T401	91TTA-137	Power	R145, 1	91TRD14PY5.6KK	5.6K ohm
	CON	ITROLS	R147, \| R148 /	91TRD14PY330K	330 ohm
VR101 VR102	91TRW-099 91TRW-096	Fader Control Volume Control	R150	91TRD14PY15KK	15K ohm
VR103	91TRW-098	Balance Control	R151, ) R152 J	91TRD14PY4.7KK	4.7K ohm

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PARTS LIST

REF. NO.	PART NO.	DESCRIPTION	REF. NO.	PART NO.	DESCRIPTION
R153, ) R154 ∫	91TRD14PY3.3KK	3.3K ohm	R239, ) R240 )	91TRD14PY33KK	33K ohm
R155, ) R156	91TRD14PY330KK	330K ohm	R301, R302, ∫	91TRD14PY330KK	330K ohm
R157, ) R158	91TRD14PY33KK	33K ohm	R303, ) R304	91TRD14PY1KK	1K ohm
R159, R160	91TRD14PY390K	390 ohm	R305, ) R306	91TRD14PY10KK	10K ohm
R161, 1 R162	91TRD12PY100K	100 ohm, 1/2W, Fuse Resistor	R307, 1 R308	91TRD14PY1KK	1K ohm
R163, 1	91TRD14PY33KK	33K ohm	R309, 1	91TRD14PY8.2KK	8.2K ohm
R165, \| R166	91TRD11PY4.7K	4.7 ohm, 1W, ±10%, Carbon	R311, 1 R312	91TRD14PY15KK	15K ohm
R168	91TRD12PY270K	270 ohm, 1/2W, ±10%, Carbon	R314	91TRD14PY3.3KK	3.3K ohm
R170	91TRD11PY100K	100 ohm, 1W, ±10%, Carbon	R316 R317	91TRD14PY680K	680 ohm
R172,	91TRD11PY100K	100 ohm, 1W, ±10%, Carbon	R318	91TRD14PY3.3KK	3.3K ohm
R174 R175	91TRD14PY2.7KK 91TRD14PY3.3KK	2.7K ohm 3.3K ohm	R320	91TRD14PY3.3MK	3.3M onm
R176, } R177 }	91TRD14PY100KK	100K ohm	R322	91TRD14PY120KK	IZUK ONI
R178	91TRD14PY3.3KK	3.3K ohm		CAPA	CITORS
R179 R180, )	91TRD14PY3.9KK	3.9K ohm	C105,	04704 47444	47005 501/ 1200/ Coromia
R181	911RD14P270KK	270K ohm	C106	911CK-471M	470PF, 50V, ±20%, Ceramic
R201 R202	91TRD14PY68KK 91TRD14PY100K	68K ohm 100 ohm	C109,	91TCMS-153J	.015MFD, 50V, ±5%, Mylar
R204	91TRD14PY220KK	220K ohm	C111,	01700 1000	1005 50V/ · 25% Coremia
R205	91TRD14PY100KK	100K ohm	C112	91100-1000	10PF, 50V, ±.25%, Ceramic
R206	91TRD14PY27KK	27K ohm	C115,	91TCK-471M	470PF, 50V, ±20%, Ceramic
R207	91TRD14PY270K	270 ohm	C116
R208	911RD14PY100KK	100K ohm 15K ohm	C118	91TCMS-392J	.0039MFD, 50V, ±5%, Mylar
R210	91TRD14PY4 7KK	47K ohm	C132.		0001155 5014 1004 14
R211	91TRD14PY220K	220 ohm	C133	91TCMS-202K	.022MFD, 50V, ±10%, Mylar
R212	91TRD14PY1KK	1K ohm	C134,	91TCMS.103K	01MED 50V +10% Mylar
R213	91TRD14PY68KK	68K ohm	C135	STICIVISTOSK
R214 R215	91TRD14PY15KK	15K ohm	C136, C137	91TCMS-202K	.022MFD, 50V, ±10%, Mylar
R216 R217	91TRD14PY33KK 91TRD14PY100KK	33K ohm 100K ohm	C138, C139	91TCMS-154K	.15MFD, 50V, ±10%, Mylar
R218	91TRD14PY12KK	12K ohm	C146,	91TCC-070C	7PF 50V ± 25%. Ceramic
R219	91TRD14PY3.3KK	3.3K ohm	C147	0000/000
R220	91TRD14PY33KK	33K ohm	C152,	91TCMS-104M	.1MFD, 50V, ±20%, Mylar
R221	91TRD14PY1.5KK	1.5K ohm	C160
R222	911RD-2PY390K	390 onm, 2W, ±10%, Carbon 27 ohm	C161	91CMS-103K	.01MFD, 50V, ±10%, Mylar
R224	91TRD14PY68K	68 ohm	C203	91TCK-471M	470PF, 50V, ±20%, Ceramic
R225	91TRD14PY3.3KK	3.3K ohm	C220	91TCK-400J	40PF, 50V, ±5%, Ceramic
R226	91TRD14PY220KK	220K ohm	C301,	91TCMS602K	06MED 50V ±10% Mylar
R227	91TRD14PY15KK	15K ohm	C302	311CIVI30021
R228	91TRD14PY100KK	100K ohm	C304,	91TCK-201M	200PF, 50V, ±20%, Ceramic
R229	91TRD14PY390K	390 ohm	C305	OTTOK DOOM	0221450 5014 . 2004 . 0
R230	91TRD14PY15KK	15K ohm	C401	911CK-333M	02MED 50V +20% Coromic
HZ31	911RD14PY8.2KK	8.2K ohm 220 ohm	C402	911CK-203W	.uzivir D, 50V, ±20%, Ceramic
R232	01TDD14PY22UK	220 onm 27K ohm		ELECTROLY	TIC CAPACITORS
R234	91TRD14PYZZKK	47K ohm
R235	91TRD14PY120KK	120K ohm	C101.	0	ATLACD 0514
R236	91TRD14PY68KK	68K ohm	C102	91TCDV47/25Y	47MED, 25V, +50 –10%
R237,	91TRD14PY3 3KK	3.3K ohm	C103,	91TCDV4.7/25M	4.7MFD. 25V. ±20%
H238		128 (Argentini 10) (Argenti 10) 428 F	C104 )		17.00

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PARTS LIST

REF. NO.	PART NO.	DESCRIPTION	REF. NO.	PART NO.	DESCRIPTION	CODE
C107, ) C108	91TCDV100/10Y	100MFD, 10V, +50 -10%	SO105 SO106	91TJV006 91TJV007	DIN Socket, PHONO Socket, SPEAKERS
C113, ) C114	91TCDV220/10Y	220MFD, 10V, +50 -10%	SW201 SW401	91TSQ-059 91TSP-103	Switch, Mic Echo Switch, Power
C119, C120, C121, C122	91TCFV2.2/16K	2.2MFD, 16V, ±10%	F401	9112G-011 91T7718BP112K 91T7718BP401K 91T7718BP301K	Fuse Holder P.W. Board, Amp P.W. Board, Switch Mic Input P.W. Board, L.E.D
C123, ) C124	91TCDV220/25Y	220MFD, 25V, +50 -10%		RREVA0001AFZZ 91TZA-058	Echo Unit AC Supply Cord
C127, C128	91TCDV1/16A	1MFD, 16V, +75 –10%		91TLP-001 91T7718A05	Lug, Pin Panel, Mode/Loudness/
C129, C130	91TCFV1/25A	1MFD, 25V, +75 –10%		91T7718A07	Function Selector Rear Panel
C131	91TCDV330/25Y	330MFD, 25V, +50 -10%		91T7718C10	Plate Spring, Volume Knob
C140, )	91TCDV3 3/25A	3 3MED 25V +75 -10%		91T7718A04	Cabinet
C141	0110010.0/20/1			9117718B07	Front Panel
C142	91TCDV100/35Y	100MFD, 35V, +50 -10%		JKNBP0165AFSA	Knob, Volume
C143, 1	91TCDV47/10Y	47MFD, 10V, +50 - 10%			(911//10002) Knob Bass/Troble/Palance/
C144 / C145	91TCDV220/35Y	220MFD, 35V, +50 -10%		JENDINUSU4AFSC	Fader/Mic echo switch	•
C148	911CDV100/351	10MED 25V +50 -10%		0177718001	Cover Mode/Loudness/
C149	91100/10/351	1010120, 350, 450 - 10%		STITICAUL	Eunction Selector
C150, 1	91TCDV47/25Y	47MFD, 25V, +50 -10%		91T7718B04	Knob, Mode/Loudness/ Function Selector
C155				91T7718B05	Plate, Bottom
C156.	91TCDV220/25Y	220MFD, 25V, +50 - 10%		91T7717B06	Knob, Power
C157				91T7718C06	Heat-sink
C158,		17001150 0514 .50 1004		91T7718C03	Front Chassis
C159	91TCDV4700/35Y	4700MFD, 35V, +50–10%		91T7718C08	Bracket, Power Transformers
C201	91TCDV47/25Y	47MFD, 25V, +50 -10%		91T7718C04	Bracket, Chassis
C202	91TCDV47/50Y	47MFD, 50V, +50 - 10%		91T7718C05	Bracket, Echo Unit
C204	91TCDV10/10Y	10MFD, 10V, +50 -10%		91T7718C07	Bracket, Bottom Plate
C205	91TCDV220/10Y	220MFD, 10V, +50 - 10%		91T7717C02	Bracket, Side
C206	91TCDV.47/16K	.47MFD, 16V, ±10%		91T7717C04	Bracket, Pulley
C207	91TCDV1/25A	1MFD, 25V, +75 - 10%		91T7717C05	Bracket, Pulley
C208	91TCDV330/25Y	330MFD, 25V, +50 -10%		91T7717C10	Spring, Knob Volume
C209	91TCDV100/10Y	100MFD, 10V, +50 - 10%		91T7502C07	Shield Plate (Bottom Plate)
C210	91TCDV220/10Y	220MFD, 10V, +50 -10%		91T7608C20	Wire Clip
C211	91TCDV100/25Y	100MFD, 25V, +50 -10%		91T7717D01	Leg (See Figure 1, 2)
C212	91TCDV330/25Y	330MFD, 25V, +50 -10%		91T7717D05	Spacer
C213	91TCDV1/25A	1MFD, 25V, +75 -10%		91T3361D04	Bushing
C214	91TCDV10/10Y	10MFD, 10V, +50 -10%		91T7718F04	Packing Case
C215	91TCDV100/10Y	100MFD, 10V, +50 -10%		91T7717F02	Packing Add
C216,				91TSQ-058	Voltage selector
C217,	91TCDV1/25A	1MFD. 25V +75 -10%		91TLA-016	Lug Terminal
C218, C219	51100 V 1/25A		SW101 (A~F)	91TSP-102	Switch, Mode/Loudness/ Eurotion Selector
MISCELLANEOUS				91TZG-012	Fuse Holder (P.W. Board)

F101, F102	91TZF-054	Fuse, 2.5AT
F 401	91TZF-053	Fuse, 110V, 1.25AT
F401	91TZF-045	Fuse, 220/240V, 630mAT
J101	91TJH-007	Jack, MIC
J102	91TJH-007	Jack, Headphone
SO101	91TJV006	DIN Socket, MIC MIX OUT
SO102	91TJV006	DIN Socket TAPE REC/
		PLAY
SO103	91TJV006	DIN Socket, AUX
SO104	91TJV006	DIN Socket, TUNER