Philips sq-20 User Manual
Philips Communication & Security Systems
Supply Centre Breda
Customer Support
The Netherlands
COPYRIGHT (c) Philips Electronics N.V. 1994
Printed in the Netherlands
Supply Centre Breda SQ 20 Amplifiers
CONTENTS
CHAPTER DESCRIPTION PAGE
1 INTRODUCTION 3
1.1 GENERAL 3
1.2 THE SQ20 RANGE 3
2 TECHNICAL DATA 4
3 INSTALLATION INSTRUCTIONS 4
4 CHECKING AND ADJUSTING 5
5 CIRCUIT DESCRIPTION 6
5.1 DIFFERENCE BETWEEN THE SEVERAL OUTPUT-STAGE’S 6
6 SPARE PARTS 7
6.1 RECOMMENDED SPARE-PARTS TOTAL SQ 20 SERIES 8
6.2 SPARE-PARTS, LISTED PER TYPE-NUMBERS 9
6.2.1 LBB 1227/00 9
6.2.2 LBB 1228/00 9
6.2.3 LBB 1229/00 10
6.2.4 LBB 1230/00 11
6.2.5 LBB 1231/00 12
6.2.6 LBB 1232/00 13
6.2.7 LBB 1233/00 14
6.2.8 LBB 1234/00 15
6.2.9 LBB 1235/00 16
6.2.10 LBB 1236/00 17
6.2.11 LBB 1237/00 18
6.2.12 LBB 1238/00 19
6.2.13 LBB 1240/00 20
Service documentation 4822 733 24416 14 February 1994
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SQ 20 Amplifiers Supply Centre Breda
CONTENTS (cont’d)
7 DRAWINGS
FIGURE: (as appendix)
7.1 LBB 1229/00 WIRING-DIAGRAM
7.2 LBB 1229/00 CIRCUIT-DIAGRAM PART 1
7.3 LBB 1229/00 CIRCUIT-DIAGRAM PART 2
7.4 LBB 1229/00 PRINTED CIRCUIT BOARD LAY-OUT
7.4.1 LBB 1230/00 CIRCUIT DIAGRAM PART 1
7.5 LBB 1230/00 CIRCUIT DIAGRAM PART 2
7.6 LBB 1230/00 PRINTED CIRCUIT BOARD LAY-OUT PART 1
7.7 LBB 1230/00 PRINTED CIRCUIT BOARD LAY-OUT PART 2
7.8 LBB 1231/00, -1232/00, -1233/00 CIRCUIT DIAGRAM PART 1
7.9 LBB 1231/00, -1232/00, -1233/00 CIRCUIT DIAGRAM PART 2
7.10 LBB 1231/00, LBB 1232/00, LBB 1233/00 PCB LAY-OUT PART 1
7.11 LBB 1231/00, LBB 1232/00, LBB 1233/00 PCB LAY-OUT PART 2
7.12 LBB 1234/00, LBB 1235/00 CIRCUIT DIAGRAM
7.13 LBB 1234/00, LBB 1235/00 PCB LAY-OUT
7.14 LBB 1237/00, LBB 1238/00 CIRCUIT DIAGRAM PART 1
7.15 LBB 1237/00, LBB 1238/00 CIRCUIT DIAGRAM PART 2
7.16 LBB 1237/00, LBB 1238/00 CIRCUIT DIAGRAM PART 3
7.17 LBB 1237/00, LBB 1238/00 CIRCUIT DIAGRAM PART 4
7.18 LBB 1237/00, LBB 1238/00 CIRCUIT DIAGRAM PART 5
7.19 LBB 1237/00, LBB 1238/00 PCB LAY-OUT PART 1
7.20 LBB 1237/00, LBB 1238/00 PCB LAY-OUT PART 2
7.21 LBB 1237/00, LBB 1238/00 PCB LAY-OUT PART 3
8. ADDITIONAL TYPE NUMBERS (SERVICE INFORMATION)
8.1 LBB 1227/00 UNIVERSAL PRE-AMPLIFIER
8.2 LBB 1228/00 CASSETTE UNIT
8.3 LBB 1236/00 SYSTEM PRE-AMPLIFIER
8.4 LBB 1240/00 240 W BOOSTER AMPLIFIER
9. GENERAL SERVICE INFORMATIONS
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1 INTRODUCTION
l.l. GENERAL
The SQ20 range of high performance a udio mixing, pre-mixing, booster and system amplifiers have been
designed for use in a wide variety of Public Address environments. Ease of operation, combined with good
service-accessibility have been optimised in their design.
1.2. THE SQ 20 RANGE
The SQ20 range consists of the following products:
LBB 1227/00 Universal Pre-Amplifier : SI 4822 861 05025
LBB 1228/00 Cassette Unit : SI 4822 861 05012
LBB 1229/00 Tuner-unit : SM 4822 733 24416
LBB 1230/00 Pre-Mixing Amplifier : : “ “
LBB 1231/00 30 Watt Mixing Amplifier : : “ “
LBB 1232/00 60 Watt Mixing Amplifier : : “ “
LBB 1233/00 120 Watt Mixing Amplifier : : “ “
LBB 1234/00 60 Watt Booster Amplifier : : “ “
LBB 1235/00 120 Watt Booster Amplifier : : “ “
LBB 1236/00 System Pre-Amplifier : SI 4822 861 05019
LBB 1237/00 60 Watt System Amplifier : SM 4822 733 24416
LBB 1238/00 120 Watt System Amplifier : : “ “
LBB 1239/00 Mounting-brackets : “ “
LBB 1240/00 240 Watt Booster Amplifier : SI 4822 861 05039
Note: SM -> Service manual
SI -> Service information
All relevant service information for the products can be found in the bulletins listed above. Not included
in this manual are the callstation(s) LBB 9427/10, LBB 9527/10 and LBB 9527/60. The LBB 9427/10,
and the new colour-item LBB 9527/10, are described within service manual: 4822 733 24437.
The LBB 9527/60 is described within a service information: 4822 861 05002.
This Service Manual is intended to provide all necessary information to carry out corrective maintenance
according to agreed policies. Spare parts are defined accordingly. In general this means repair on sub
assembly level. Component level repair can only be allowed where it can be carried out on a cost-effective
way.
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SQ 20 Amplifiers Supply Centre Breda
2 TECHNICAL DATA
Figure 2.1 upto and including 2.4 give all relevant data for SQ20 products.
For products for which service information is released through SI’s this information can be foun d in
chapter 8.
3 INSTALLATION INSTRUCTIONS
- Opening the amplifie r
Access can be gained to the inner side of the amplifier by removing the top cover.
Care should be taken not to lose the toothed washers which are fitted underneath the screws. For safety
reasons these washers are required to electrically bond the top cover to the earthed chassis of the amplifier.
And must therefore always be fitted.
Warning !: Before removing the cover, disconnect the amplifier from the mains supply b y
removing the mains plug!
- 19” Rack Mounting
The range of SQ20 system amplifiers have been designed for both tabletop and 19” rack mounting. Two
mounting brackets (LBB 1239/00) can be ordered when rack mounting is required.
To attach the mounting brackets, first remov e the top cover as described.
Locate the two screw holes provided for at both sides of the amplifier. Using the also added screws, firmly
mount the brackets to the amplifier.
CAUTION !: SQ20 amplifiers are not suitable for any surveillance application with e.g. 20kHz.
It is essential that the SQ 20 products are used within the specified temperature range.
The maximum permissible tempe rature is + 45°C. Care has to be taken that when they
are mounted within a 19” cabinet the air inside the 19” cabinet never exceeds the above
mentioned maximum temperature.
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Supply Centre Breda SQ 20 Amplifiers
- Mains connections and earthing
The system amplifiers are supplied ready for use on 220 V a.c. mains. They are adjustable for use on
110 V, 127 V, 220 V –230 V and 240 V by resoldering the brown wire onto the appropriate tag on the
mains transformer (T). The protective shield on the mains transformer should never be removed. Care
should be taken to ensure that the wire is hooked in, and firmly soldered onto the tag.
A non restoring thermal fuse, located in the mains transformer, will disconnect the mains supply, should
the mains transformer over heat.
CAUTION: The amplifier must be tapped for the correct mains voltage, as described, before
connecting it to th e mains supply. On delivery the amplifie r is supplied with a 2m long
3-core mains lead, terminated at one end with a 2 pole mains plug with earth contacts,
and at the other end with a C.E.E connector. In some countries it may be necessary to
replace the mains plug with one of a local standard type. A replacement plug must be
wired as follows:
Earth - green/yellow
Neutral - blue
Live - brown
WARNING !: This amplifier must be powered via an earthed mains outlet
WARNING !: This fusable link operates on the primary winding of the mains transformer, and
although the mains indicator LED may be off the full mains supply voltage is still
present inside the amplifier.
4 CHECKING AND ADJUSTING
See Instructions for use which are always included in the same package as the product.
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SQ 20 Amplifiers Supply Centre Breda
5 CIRCUIT-DESCRIPTION
Detailed circuit descriptions are not included in this manual . The used technique for this amplifiers in
combination with the selected spare parts makes this not necessary. The knowledge of the workshopengineer should be at the required level.
5.1 DIFFERENCE BETWEEN THE SE VERAL OUTPUT-STAGE’S :
AMPLIFIER-MODEL 30W 60W 120W
MIXING- LBB 1231/00 1232/00 1233/00
BOOSTER- LBB 1234/00 1235/00
SYSTEM- LBB 1237/00 1238/00
ITEM 30W 60W 120W
R150, R156 - - 4,7Ω
R155, R158 - - 1,5k Ω
R149, R166 470 Ω 1k Ω 1,5k Ω
R144 4,7 kΩ 5,6kQ 5,6k Ω
C201 4700uF 6800uF 4700uF
C207 4700uF
F201 F 5A F 8A F 10A
F202 F 10A
F001 T 1A T 1,6A T 2,5A
R501 330 Ω 180 Ω 100 Ω ALL 5W
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Supply Centre Breda SQ 20 Amplifiers
6 SPARE-PARTS
General:
The spare-parts, as indicated in the following lists, are selected components / sub assemblies.
The spare-parts are available from Philips Consumer Service.
The mentioned spare-parts, used within the several products of the SQ20 range, are NOT listed with the
so-called ’pos.’ numbers. Instead of, we have used the commercial code number of the component. E.g.
Transistor Q302 which has a commercial indicator C458 is listed as “transistor C458 NPN with a 5322..
number-, and NOT as “pos. Q302”, with a 5322.. number.
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SQ 20 Amplifiers Supply Centre Breda
6.1 RECOMMENDED SPARE-PARTS TOTAL SQ 20 SERIES:
Tuner PCB assy. (LBB 1229-1236-1237-1238) 5322 214 11157
Tuner-Meter 5322 344 50118
Battery connector 5322 265 30875
Mains switch 5322 277 11136
Mains inlet 5322 265 30876
Thermistor SDT 09 5322 116 30414
Mains transformer (LBB 1227-1229-1230) 5322 146 10331
Mains transformer PT-SQ20-30W 5322 140 60291
Output transformer 30 W 5322 146 10327
Mains transformer PT-SQ20-60W 5322 146 10332
Output transformer 60 W 5322 146 10333
Mains transformer PT-SQ20-120W 5322 146 10334
Output transformer 120 W 5322 140 60332
Mains transformer (LBB 1236) 5322 148 20024
Output transformer 240 W (OT-SQ20-240W) 5322 140 10481
Transistor C485 NPN 5322 130 62667
Transistor A673 PNP 4822 130 41412
Operational amplifier LF 353 5322 209 81395
Operational amplifier LM 324 4822 209 80587
Integrated circuit BA 6144 4822 209 73037
Integrated circuit NJM 386 D 5322 209 72458
Diode 1 N 60 Germanium 4822 130 80562
Diode 1 N4148 (BAW 62) 4822 130 30613
Power-transistor C3281 5322 130 62673
Pre-amplifier integrated circuit OQ 0703 5322 209 63972
Fan-motor 5322 361 10598
Fuses: F 0,5 A 4822 070 35001
T 0,5 A 4822 070 15001
T 1,0 A 4822 070 31002
T 1,6A 4822 070 31602
T 2,0 A 4822 070 32002
T 2,5 A 4822 070 32502
T 3,15 A 4822 070 33152
F 5,0 A 5322 253 40055
T 5,0 A 4822 070 35002
F 8,0 A 5322 253 40034
F 10 A 4822 070 61003
Handgrip (2 pcs. incl. screws) 5322 498 50319
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Supply Centre Breda SQ 20 Amplifiers
6.2 SPARE-PARTS listed per type-number:
6.2.1 SPARE-PARTS LBB 1227/0 0 SQ-20 UNIVERSAL PRE-AMPLIFI ER
P.C.B assy. (27-1) 5322 214 91079
P.C.B assy. (27-2) 5322 214 91081
P.C.B assy. (27-3) 5322 214 91082
Mains transformer 5322 146 10331
Mains switch 5322 277 11136
Mains inlet 5322 265 30876
Rotary switch 5322 273 80347
Knob (volume) 5322 414 30152
Knob (tone control) 5322 414 30183
Handgrip (2 pcs. incl. screws) 5322 498 50319
6.2.2 SPARE-PARTS LBB 1228/0 0 SQ-20 CASSETTE UNIT
P.C.B assy. (SQ20 28-1) 5322 214 11226
Integrated circuit (U2) TA 7668 BP 4822 209 71873
Front panel 5322 447 50154
Complete cassette player (commercial item) LBB 1228/50
19” mounting brackets (commercial item) LBB 1239/00
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SQ 20 Amplifiers Supply Centre Breda
6.2.3 SPARE-PARTS LBB 1229/0 0 SQ-20 TUNER-UNIT
Tuner PCB assy. 5322 214 11157
Tuner-Meter 5322 344 50118
Tuner channel-selector switch 5322 210 10424
Loudspeaker 5322 240 40196
Mains transformer (PT-SQ20-PM) 5322 146 10331
Mains switch 5322 277 11136
Mains inlet 5322 265 30876
Fuse (5A) 5322 253 40055
Battery connector 5322 265 30875
Potentiometer (50K) 5322 101 11138
Transistor C485 NPN 5322 130 62667
Transistor A673 PNP 4822 130 41412
Operational amplifier LF 353 5322 209 81395
Integrated circuit BA 6144 4822 209 73037
Integrated circuit NJM 386 D 5322 209 72458
Diode 1 N 60 Germanium 4822 130 80562
Diode BAW 62 4822 130 30613
Diode 1N4148 4822 130 30621
Front panel 5322 447 50146
Handgrip (2pcs. incl. screws) 5322 498 50319
Knob (Ø14) 5322 414 30183
Jack-plug (PJ-202 NP) 5322 265 20515
Phone jack (HT J064-03) 5322 267 10273
Phone jack 5322 267 10276
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6.2.4 SPARE-PARTS LBB 1230/0 0 SQ-20 PRE-MIXING AMPLIFIER
PCB assy. (SQ20-3) 5322 214 11211
PCB assy. (SQ20-7) 5322 214 11212
Mains transformer PT SQ.20-PM 5322 146 10331
Main switch 5322 277 11136
Mains inlet 4300-1002 5322 265 30876
Battery connector (incl. fuse) DT55A02W-02 5322 265 30875
Fuses: F 0,5 A 4822 070 35001
T 1 A 4822 070 31002
T 0,5 A 4822 070 15001
Potentiometer RK163111A152 5322 101 11139
Potentiometer RK163111R376 5322 101 11138
Transistor C485 NPN 5322 130 62667
Transistor A673 PNP 4822 130 41412
Operational amplifier LF 353 5322 209 81395
Integrated circuit BA 6144 4822 209 73037
Integrated circuit NJM 386 D 5322 209 72458
Diode 1 N 60 Germanium 4822 130 80562
Diode BAW 62 4822 130 30613
Diode 1N4148 4822 130 30621
Front panel 5322 447 50153
Handgrip (2 pcs. incl. screws) 5322 498 50319
Knob (Ø 18) 5322 414 30152
Knob (Ø 14) 5322 414 30183
Jack plug PJ-202NP 5322 265 20515
Phone Jack HTJ064-03 5322 267 10273
DIN 5 pol DJ-005 5322 267 10272
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SQ 20 Amplifiers Supply Centre Breda
6.2.5 SPARE-PARTS LBB 1231/0 0 SQ-20 30 W MIXING AMPLIFIE R
PCB assy. Main 30W (SQ20-1) 5322 214 11213
PCB assy. Pre-input (SQ20-7) 5322 214 11212
PCB assy. Power supply (SQ20-2) 5322 214 11218
Mains transformer 30W 5322 140 60291
Main switch 5322 277 11136
Mains inlet 5322 265 30876
Thermistor SDT 09 5322 116 30414
Battery conn. incl. fuse 5322 265 30875
Fuses: F 5,0 A 5322 253 40055
T 2,0 A 4822 070 32002
T 1,0 A 4822 070 31002
Output transformer 30 W 5322 146 10327
Potentiometer A152 5322 101 11139
Potentiometer R376 5322 101 11138
Transistor C485 NPN 5322 130 62667
Transistor D673 PNP 4822 130 41412
Transistor D613E NPN 5322 130 62961
Transistor D667 NPN 5322 130 43371
Power-transistor C3281 5322 130 62673
Power-transistor 2SD718(0) 5322 130 62836
Pre-amplifier integrated circuit OQ 0703 5322 209 63972
Operational amplifier LF 353 5322 209 81395
Integrated circuit BA 6144 4822 209 73037
Integrated circuit NJM 386 D 5322 209 72458
Diode 1 N 60 Germanium 4822 130 80562
Diode D 1502 5322 130 82533
Diode BAW 62 4822 130 30613
Diode 1N4148 4822 130 30621
Diode P600D 5322 130 82746
Front panel 5322 447 50144
Handgrip (2pcs. incl. screws) 5322 498 50319
Knob (Ø 18) 5322 414 30152
Knob (Ø 14) 5322 414 30183
Jack plug 5322 265 20515
5P DIN 5322 267 10272
Phone Jack 5322 267 10273
Made-and-lock 6 pol. 5322 267 40995
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Supply Centre Breda SQ 20 Amplifiers
6.2.6 SPARE-PARTS LBB 1232/0 0 SQ-20 60 W MIXING AMPLIFIE R
PCB assy. Main 60W (SQ20-1) 5322 214 11214
PCB assy. Pre-input (SQ20-7) 5322 214 11212
PCB assy. Power supply (SQ20-2) 5322 214 11219
Mains transformer 60 W 5322 146 10332
Mains switch 5322 277 11136
Mains inlet 5322 265 30876
Battery conn. incl. fuse 5322 265 30875
Thermistor SDT 09 5322 116 30414
Fuses: F 8,0 A 5322 253 40034
T 3,15 A 4822 070 33152
T 1,6 A 4822 070 31602
Output transformer 60 W 5322 146 10333
Potentiometer A152 5322 101 11139
Potentiometer R376 5322 101 11138
Transistor C485 NPN 5322 130 62667
Transistor A673 PNP 4822 130 41412
Transistor D613E NPN 5322 130 62691
Transistor D667 NPN 4822 130 43371
Power-transistor C3281 5322 130 62673
Pre-amplifier integrated circuit OQ 0703 5322 209 63972
Operational amplifier LF 353 5322 209 81395
Integrated circuit BA 6144 4822 209 73037
Integrated circuit NJM 386 D 5322 209 72458
Diode 1 N 60 Germanium 4822 130 80562
Diode D 1502 5322 130 82533
Diode BAW 62 4822 130 30613
Diode 1 N4148 4822 130 30621
Diode P600D 5322 130 82746
Front panel 5322 447 50144
Handgrip (2 pcs. incl. screws) 5322 498 50319
Knob (Ø 18) 5322 414 30152
Knob (Ø 14) 5322 414 30183
Jack plug 5322 265 20515
Phone JACK 5322 267 10273
SP DIN 5322 267 10272
Made-and-lock 6 pol. 5322 267 40995
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SQ 20 Amplifiers Supply Centre Breda
6.2.7 SPARE-PARTS LBB 1233/0 0 SQ-20 120 W MIXING AMPLIFIE R
PCB assy. Main 120W (SQ20-1) 5322 214 11215
PCB assy. Pre-input (SQ20-7) 5322 214 11212
PCB assy. Power supply (SQ20-2) 5322 214 11221
Mains transformer 120 W 5322 146 10334
Mains switch 5322 277 11136
Mains inlet 5322 265 30876
Thermistor SDT 09 5322 116 30414
Battery conn. incl. fuse 5322 265 30875
Fuses: F 10 A 4822 070 61003
T 5,0 A 4822 070 35002
T 2,5 A 4822 070 32502
Output transformer 120 W 5322 140 60332
Fan-motor 5322 361 10598
Potentiometer A152 5322 101 11139
Potentiometer R376 5322 101 11138
Transistor C485 NPN 5322 130 62667
Transistor A673 PNP 4822 130 41412
Transistor D613E NPN 5322 130 62961
Transistor D667 NPN 4822 130 43371
Power-transistor C3281 5322 130 62673
Pre-amplifier integrated circuit OQ 0703 5322 209 63972
Operational amplifier LF 353 5322 209 81395
Integrated circuit BA 6144 4822 209 73037
Integrated circuit NJM 386 D 5322 209 72458
Diode 1 N 60 Germanium 4822 130 80562
Diode D 1502 5322 130 82533
Diode BAW 62 4822 130 30613
Diode 1 N4148 4822 130 30621
Front panel 5322 447 50144
Handgrip (2 pcs. incl. screws) 5322 498 50319
Knob (Ø 18) 5322 414 30152
Knob (Ø 14) 5322 414 30183
Jack plug 5322 265 20515
Phone jack 5322 267 10273
5P DIN 5322 267 10272
Made-and-lock 6 pol. 5322 267 40995
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