Page 1
7654321
8
D
C
FROM PREAMP
B
L990_PA_L
SW100A
2PCO
2
PL100
2
C100
1N0 SM
PL101
2
5
L990_PA_L.SCH
INPUT
0V_SIG
0V_HF
VPOS
VNEG
L990_PA_R
L990_PA_R.SCH
INPUT
0V_SIG
0V_HF
VPOS
VNEG
3
1
SK104B
TP100
0V_SIG
PHONO4G
1
6
F
N
SK102
1
2
3
4
AMPCT4
0V_SIG
L SIG
0V_SIG
0V_LS_L
0V_HF_L
+49V
-49V +5V_D
R SIG
0V_SIG
0V_LS_R
0V_HF_R
+49V
-49V
1
1
SK104A
F
EMC
N
PHONO4G
0V_SIG
SW100B
2PCO
4
INTEGRATED / PRE-POWER
MODE SELECT SWITCH
FIT SK103 ON PCB TO LINE UP WITH SILK SCREEN
+5V_D
FFC 14W 2.54MM VER
SK103
1
2
3
4
5
6
7
8
9
10
11
12
13
14
R100
10R MF
0R0 SM
R109
+49V
STANDBY
SPKR1 ON
SPKR2 ON
THERMPROT
VIPROT
DCPROT
AC PRESENT
TRIGGER
REMOTE
0V_D
0V_TRIG
TP103
TP104
TP105
TP106
VIPROT
DCPROT
OUTPUT0V_LS
VIPROT
DCPROT
OUTPUT0V_LS
0V_FB_R
TP107
TP108
TP101
TP102
TP109
VIPROT_L
DCPROT_L
LS L
VIPROT_R
DCPROT_R
LS R
0V_FB_R
TP110
TP117
L SIG
R SIG
0V_D
0V_PSU
STANDBY
VIPROT_L
VIPROT_R
0V_TRIG
DCPROT_L
DCPROT_R
AC PRESENT
RLY DPDT 5V SM A216
LS L
0V_LS_L
RLY102B
LS R
STANDBY
notSTANDBY
LS L
TP111 TP113 TP115
0V_LS_L
LS R
TP112 TP114 TP116
0V_LS_R
L990_MICRO
L990_MICRO.SCH
0V_D +5V(D)
0V_PSU
PWRON
VIPROT_R VIPROT_uC
DCPROT_L
DCPROT_R
This line is active High
RLY102A
SK106
1
RLY100A
2
3
4
5
AMPCT5
TO H/PHONE
BOARD
0V_D
R115
4K7 SM
Relay RLY102 is on (allowing signal to headphones)
only when ACpresent is low & notSTANDBY is high.
notSTANDBY is the same as PWRON
RLY G5PA-2 24V A209
RLY100B
RLY G5PA-2 24V A209
THPROT_uCVIPROT_L
AC_PRES0V_TRIG
DCPROT_uC
RC5 IN
TRG IN
470R SM
SK100A
Top+
Top-
CAMCON_G
SK101A
Top+
Top-
CAMCON_G
VPOS
VNEG
R110
BAS16W SM
R114
470R SM
D102
RLY101A
RLY G5PA-2 24V A209
RLY101B
RLY G5PA-2 24V A209
+49V
-49V
THERMPROT
VIPROT
AC PRESENT
DCPROT
REMOTE
TRIGGER
+5V_D
Q101
BC849B
+
-
RLY DPDT 5V SM A216
Q100
BC849B
0V_D
SK100B
CAMCON_G
SK101B
CAMCON_G
RLY102C
Bot+
Bot-
Bot+
Bot-
RLY G5PA-2 24V A209
12
D100
1N4003F
TR100
BD179
SK105
HPSKT
RLY100C
R107
220R SM
L
LHC
RHC
R
0V_TRIG
0V_D
4
5
2
3
1
6
7
RLY G5PA-2 24V A209
TR101
BD179
HEADPHONE SNAP OFF
TP118
TP119
TP120
R105
R106
33R 1W CF
TP121
SP100 STAR_8
FIX100
FIXING HOLE 3.2
RLY101C
R101
100R SM
R102
100R SM
R108
220R SM
R111
470R 1W CF
R103
470R 1W CF
R104
470R 1W CF
R112
470R 1W CF
33R 1W CF
D101
1N4003F
R113
100R 1W CF
SK107
1
2
3
4
5
AMPCT5
+49V
0V_SIG
0V_HF_R
0V_LS_R
0V_LS_L0V_HF_L
0V_PSU
SPKR1 ON
SPKR2 ON
0V_D
PCB
L990PB_1
EL
EARTH LEAD
EARTH LEAD
D
C
B
PCB
8M101
DP100
15mm x 6mm x 3mm
DAMPING PAD
A
E802AP
15X6X3_DAMPING_PAD
ON SIDE OF C209
DP101
15mm x 6mm x 3mm
DAMPING PAD
E802AP
15X6X3_DAMPING_PAD
ON SIDE OF C210
1 2 3 4 5 6 7 8
DP102
15mm x 6mm x 3mm
DAMPING PAD
E802AP
15X6X3_DAMPING_PAD
ON SIDE OF RLY100
DP103
15mm x 6mm x 3mm
DAMPING PAD
E802AP
15X6X3_DAMPING_PAD
ON SIDE OF RLY101
SEE ECO 02_E313
DRAWING TITLE
A90 Amplifier and PSU update - Top Sheet
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9QR
Notes:
Filename
L990_TOP.PRJ
Circuit Diagram
05_E165 AJD 15/08/05 1.1Fix Headphone mute circuit.
05_E165 AJD 15/08/05 1.0Fix Ground on trigger and add Diode to trigg out release issue
05_E103 JAR 19/05/05 A.0
ECO No. DESCRIPTION OF CHANGE
Date Printed
INITIALS
17-Aug-2005
DATE
Drawn by:
J Roscoe
Replace obsolete relays + circuit improvementsWas L882AY issue 4.0
ISSUE
1 4Sheet of
DRAWING NO.
L990_TOP
A
Page 2
7654321
MAINS WIRING AND AUXILIARY SUPPLY
RLY200C
DPDT5V
R200
1K0 SM
TR203
FMMT497
TP203
NEUTRAL
D205
BAS16W SM
TX200
1 0V
115V
2
3
115V
4
TX 6VA 9311
TR202
FMMT597
0V_D
6VA
5
9V
0V
6
7
9V
0V
8
C213
10N SM
F202
T750mA SM
C233
100N SM
9VRMS
C224
100N CD
D200
1N4003F
100N SM
D201
1N4003F
1N4003F
C236
D202
D203
1N4003F
TP204
C237
100N SM
C238
100N SM
+
C227
3300u 25V
9VRMS
HS200
TO220HS08REG
IC201
L4940V5
I
Vin
G
C225
100N CD
R211
10K SM
Vout
GND
D206
BAS16W SM
O
HS
TR204
BC849B
TP205
0V_D
0V_D
+5V_D
C226
100N CD
+5V_D
R219
1K8 SM
+
C229
22U EL
+5V_D
+5V(D)
+
C228
1000u 10V
0V_D
IC202E
1011
74HC14D
MICROPROCESSOR SIGNALS INTERFACE
R220
10R SM
AC_PRES
SK203
IEC3 NO RIVETS
C205
3N3 MAINS
TP206
BR200
1
BRGBU8D
+
-
C231
4
100N SM
N E L
N
220N X2 CLASS
2
~
E
TP200
EARTH
C234
R231
1M5 VR37
+49V
C232
100N SM
-49V
TP207
L
C206
3N3 MAINS
LIVENEUTRAL
+
C209
10,000u 63V
+
C210
10,000u 63V
POWER AMP SUPPLY
C211
100N PE
C212
100N PE
0V_PSU
TP208
0V_PSU
TP209
VPOS
VNEG
LIVE
NEUTRAL
LIVE
SK205
1
2
3
4
5
6
AMPCT6
SW200B
VOL SEL SLIDE
SW200A
VOL SEL SLIDE
F200
T4A
F201
T4A
PWRON
D
C
SK200
3
2
1
MOLEXPWR6
NF
SH200
EMCMAINS
BC200
TOOLING4.1
6
5
4
EMC Shield
GREEN
SK202
CAGECLAMP1
1
C200
100N SM
3
~
C230
100N SM
SK204
4
8
3
7
2
6
1 5
MOLEXPWR8
RLY200A
DPDT5V
C207
3N3 MAINS
RLY200B
DPDT5V
C208
3N3 MAINS
STANDBY RELAY CONTROL
R212
4K7 SM
TP202
TP201
TP210
+5V_D
8
D
C
14
IC202G
74HC14D
R201
1K0 SM
R202
1K0 SM
R203
1K0 SM
R204
1K0 SM
Notes:
Filename
L990_MICRO.SCH
7
Circuit Diagram
TRG IN
+5V_DCARRIER FILTER AND DEMODULATOR
R222
10K SM
R223
10K SM
1
R229
100K SM
C242
1N0 SM
84
0V_TRIG
IC200C
LM393A SM
C239
100N SM
+
C243
10U EL
VIPROT_L
VIPROT_R
DCPROT_L
DCPROT_R
DRAWING TITLE
A90 Amplifier & PSU update - Microcontroller Interface
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9QR
R209
10K SM
TP211
R226
470R SM
R227
1K0 SM
0V_TRIG
DZ204
4V7 350MW SM
R228
0R0 SM
R232
0R0 SM
RC5 IN
R208
10K SM
L200
27mH
IC200B
7
LM393A SM
C241
680P PP
5
6
B
SK201A
JACK3.5X2
MODULATED RC5
REMOTE CONTROL INPUT
SIGN
SWN
Near to PCB
GNDN
R224
1K8 SM
R230
1K5 SM
R225
1K8 SM
IC200A
2
3
LM393A SM
C240
10N SM
Not Fitted
+49V
R218
10K SM
TR200
BD179
60mA MAX CURRENT
TRIGGER OUTPUT
APPROX 13.5VDC
A
SK201B
JACK3.5X2
1 2 3 4 5 6 7 8
TP212
Far from PCB
D204
1N4003F
0V_TRIG
C235
1N0 SM
R210
10K SM
CAMCON_G
SK101C
R217
10R SM
+
CHASS
C222
10U EL
TR201
FMMT497
DZ207
15V 350MW SM
+
C223
10U EL
0V_TRIG
C214
10N SM
0V_D
C216
10N SM
0V_D
C215
10N SM
C217
10N SM
C201
100N SM
IC202A
1 2
74HC14D
IC202B
3 4
74HC14D
IC202C
5 6
74HC14D
IC202D
74HC14D
C202
100N SM
TH200
PTH90DEG
IC202F
R205
74HC14D
1K0 SM
0V_D
R213
4K7 SM
R214
4K7 SM
C219
10N SM
R215
4K7 SM
R216
89
4K7 SM
C221
10N SM
05_E165 AJD 15/08/05 1.0Fix Ground on trigger and add Diode to trigg out release issue
05_E103 JAR 19/05/05 A.0Replace obsolete relays + circuit improvementsWas L882AY issue 4.0
ECO No. DESCRIPTION OF CHANGE
INITIALS
Date Printed
17-Aug-2005
+5V_D
0V_D
+5V_D
0V_D
1213
TR205
BC856B
R206
1K0 SM
TR206
BC856B
R207
1K0 SM
R221
10R SM
DATE
C218
10N SM
C220
100N SM
Drawn by:
J Roscoe
THPROT_uC
C203
100N SM
C204
100N SM
VIPROT_uC
DCPROT_uC
2 4Sheet of
DRAWING NO.
L990_MISC
B
A
ISSUE
Page 3
7654321
8
D
R315
TR300
FMMT597
C310
100N SM
3
2
C321
100N SM
C314
100N SM
TR314
FMMT497
100R SM
PNP CURRENT MIRROR
TR311
FMMT497
R328
4K7 SM
TP302
0V_SIG
84
IC300A
1
TL072CD
TP303
TR303
FMMT597
NPN CURRENT MIRROR
R317
100R SM
R300
10K SM
+
C300
DZ300
100U EL
15V 350MW SM
0V_HF
0V_SIG
C
INPUT
0V_SIG
0V_HF
B
INPUT FILTER V TO I AMP
R324
1K0 SM
DZ302
4V7 350MW SM
DZ303
4V7 350MW SM
0V_SIG
+
C301
100U EL
0V_HF
C309
100N SM
DZ301
15V 350MW SM
R309
10K SM
R327
22K SM
C316
470P FKP2 100V
0V_SIG
7
TL072CD
TP304
0V_SIG
C317
470N PE
IC300B
R322
22R SM
R337
22R SM
R357
0R0 SM
R360
820R SM
R361
820R SM
R319
100R SM
R333
3K3 SM
DC SERVO
R330
6
1M0 SM
5
0V_SIG
R331
820R SM
R332
820RSM
R335
3K3 SM
FMMT497
FMMT497
R320
100R SM
FMMT597
TR301
FMMT597
TR321
C307
100P SM
TR322
FMMT497
C311
100N PE
C308
100P SM
TR320
TR315
100R SM
0V_SIG
R316
100R SM
R356
220K SM
R355
6K2 SM
R354
1K0 SM
R318
TR309
FMMT497
BOOTSTRAP
+
C302
100U EL 100V
R352
470R 2W MF 5%
470R 2W MF 5%
R353
+
C306
100U EL 100V
BOOTSTRAP
TR306
FMMT597
1K0 SM
R358
1K0 SM
R338
150R SM
+
C318
10U EL
R339
150R SM
R359
PRE DRIVER
TR310
FMMT497
R321
33R SM
C312
10N SM
R323
33R SM
TR307
FMMT597
PRE DRIVER
ADJ BIAS
RV300
100R PSET
D300
BAS16W SM
OUTPUT STAGE
TR318
SAP15N
TP305
R325
1K0 SM
R340
100K SM
R326
1K0 SM
TP306
TR319
SAP15P
OUTPUT STAGE
PL300
1
2
MEASURE
BIAS
(SET TO 16mV)
R341
390R SM
R342
390R SM
R343
100R SM
R344
100R SM
D305
22V 350MW SM
V-I PROTECTION
R334
10K SM
R347
100R SM
R345
220R SM
+
C303
100U EL
+
C304
100U EL
R346
220R SM
R348
100R SM
R336
10K SM
V-I PROTECTION
D306
22V 350MW SM
D301
BAS16W SM
TR312
FMMT497
TR304
FMMT597
D302
BAS16W SM
D303
1N4003F
DC OFFSET SIGNAL
TO MICRO
D304
1N4003F
R349
100R SM
DCPROT
TP308
DZ306
4V7 350MW SM
0V_HF
TR305
FMMT597
R302
10K SM
R310
4K7 SM
C315
100N SM
R301
10K SM
R329
4K7 SM
TR313
FMMT497
R303
10K SM
R304
10K SM
TR316
FMMT497
TR308
FMMT597
R311
10K SM
R312
10K SM
TR302
FMMT597
R305
10K SM
R306
10K SM
0V_HF
DC OFFSET
DETECTION
R307
10K SM
R313
10K SM
TR317
FMMT497
VI PROTECT
SIGNAL TO MICRO
TP307
+
C305
10U EL
R308
22K SM
C320
100U NP
VIPROT
DZ305
4V7 350MW SM
R351
5R6 2W CF
L300
2U2H LAC SMALL
R350
5R6 2W CF
ZOBEL NETWORK
C319
100N PE
0V_HF 0V_LS
R314
10K SM
C313
100N SM
VPOS
OUTPUT
0V_LS
0V_HF
VNEG
D
C
B
A
A
DRAWING TITLE
A90 Amplifier update - Power Output Stage Left
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9QR
1 2 3 4 5 6 7 8
Notes:
Filename
L990_PA_L.SCH
Circuit Diagram
05_E165 AJD 15/08/05 1.0Fix Ground on trigger and add Diode to trigg out release issue
05_E103 JAR 19/05/05 A.0Replace obsolete relays + circuit improvementsWas L882AY issue 4.0
ECO No. DESCRIPTION OF CHANGE
Date Printed
INITIALS
17-Aug-2005
DATE
Drawn by:
J Roscoe
3 4Sheet of
DRAWING NO.
L990_PA_L
ISSUE
Page 4
7654321
8
D
R415
TR400
FMMT597
C410
100N SM
3
2
C421
100N SM
C414
100N SM
TR414
FMMT497
100R SM
PNP CURRENT MIRROR
TR411
FMMT497
R428
4K7 SM
TP402
0V_SIG
84
IC400A
TP404
1
TL072CD
TP403
NPN CURRENT MIRROR
R417
100R SM
R400
10K SM
+
C400
DZ400
100U EL
15V 350MW SM
0V_HF
0V_SIG
C
INPUT
0V_SIG
0V_HF
B
INPUT FILTER V TO I AMP
R424
1K0 SM
DZ402
4V7 350MW SM
DZ403
4V7 350MW SM
0V_SIG
+
C401
100U EL
0V_HF
C409
100N SM
DZ401
15V 350MW SM
R409
10K SM
R427
22K SM
470P FKP2 100V
C416
TR403
FMMT597
0V_SIG
7
TL072CD
0V_SIG
C417
470N PE
IC400B
R422
22R SM
R437
22R SM
R457
0R0 SM
R460
820R SM
R461
820R SM
R419
100R SM
R433
3K3 SM
DC SERVO
R430
6
1M0 SM
5
0V_SIG
R431
820R SM
R432
820R SM
R435
3K3 SM
R420
100R SM
FMMT597
TR401
FMMT597
TR421
C407
100P SM
TR422
FMMT497
C411
100N PE
C408
100P SM
TR420
FMMT497
TR415
FMMT497
R456
220K SM
0V_SIG
100R SM
R416
100R SM
R455
6K2 SM
R454
1K0 SM
R418
TR409
FMMT497
BOOTSTRAP
+
C402
100U EL 100V
R452
470R 2W MF 5%
470R 2W MF 5%
R453
+
C406
100U EL 100V
BOOTSTRAP
TR406
FMMT597
R459
1K0 SM
R438
150R SM
+
C418
10U EL
R439
150R SM
R458
1K0 SM
PRE DRIVER
TR410
FMMT497
R421
33R SM
C412
10N SM
R423
33R SM
TR407
FMMT597
PRE DRIVER
ADJ BIAS
RV400
100R PSET
D400
BAS16W SM
OUTPUT STAGE
TR418
SAP15N
TP405
R425
1K0 SM
R440
100K SM
R426
1K0 SM
TP406
TR419
SAP15P
OUTPUT STAGE
PL400
1
2
MEASURE
BIAS
(SET TO 16 mV)
R441
390R SM
R442
390R SM
R443
100R SM
R444
100R SM
D405
22V 350MW SM
V-I PROTECTION
R434
10K SM
R447
100R SM
R445
220R SM
+
C403
100U EL
+
C404
100U EL
R446
220R SM
R448
100R SM
R436
10K SM
V-I PROTECTION
D406
22V 350MW SM
D401
BAS16W SM
TR412
FMMT497
TR404
FMMT597
D402
BAS16W SM
D403
1N4003F
DC OFFSET SIGNAL
TO MICRO
D404
1N4003F
R449
100R SM
DCPROT
TP408
DZ406
4V7 350MW SM
0V_HF
TR405
FMMT597
R402
10K SM
R410
4K7 SM
C415
100N SM
R401
10K SM
R429
4K7 SM
TR413
FMMT497
R403
10K SM
R404
10K SM
TR416
FMMT497
TR408
FMMT597
R411
10K SM
R412
10K SM
TR402
FMMT597
R405
10K SM
R406
10K SM
0V_HF
DC OFFSET
DETECTION
R407
10K SM
R413
10K SM
TR417
FMMT497
VI PROTECT
SIGNAL TO MICRO
TP407
+
C405
10U EL
R408
22K SM
C420
100U NP
VIPROT
DZ405
4V7 350MW SM
R451
5R6 2W CF
L400
2U2H LAC SMALL
R450
5R6 2W CF
ZOBEL NETWORK
C419
100N PE
0V_HF 0V_LS
R414
10K SM
C413
100N SM
VPOS
OUTPUT
0V_LS
0V_HF
VNEG
D
C
B
A
A
DRAWING TITLE
A90 Amplifier update - Power Output Stage Right
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9QR
1 2 3 4 5 6 7 8
Notes:
Filename
L990_PA_R.SCH
Circuit Diagram
05_E165 AJD 15/08/05 1.0Fix Ground on trigger and add Diode to trigg out release issue
05_E103 JAR 19/05/05 A.0Replace obsolete relays + circuit improvementsWas L882AY issue 4.0
ECO No. DESCRIPTION OF CHANGE
Date Printed
INITIALS
17-Aug-2005
DATE
Drawn by:
J Roscoe
4 4Sheet of
DRAWING NO.
L990_PA_R
ISSUE
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