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1
2
L SIG
D
0V_SIG
0V_LS_L
0V_HF_L
+49V
-49V
R SIG
0V_SIG
0V_LS_R
0V_HF_R
+49V
-49V
SW100A
2PCO
PL100
C
1
SK104A
SK102
1
F
TP100
2
FROM PREAMP
3
EMC
4
N
0V_SIG
C100
AMPCT4
1N0 SM
PHONO4G
PL101
0V_SIG
0V_SIG
SW100B
2PCO
INTEGRATED / PRE-POWER
MODE SELECT SWITCH
+5V_D
B
R100
SK103
+49V
1
10R MF
2
3
4
STANDBY
5
SPKR1 ON
6
SPKR2 ON
7
THERMPROT
8
VIPROT
9
DCPROT
10
AC PRESENT
11
TRIGGER
12
REMOTE
13
0V_D
14
FFC 14W 2.54MM VER
8K7014
A
1
2
3
L882C3
L882C3_4.1.SCH
VIPROT_L
INPUT
VIPROT
DCPROT_L
0V_SIG
DCPROT
LS L
0V_LS
OUTPUT
0V_HF
0V_D
VPOS
0V_PSU
VNEG
STANDBY
VIPROT_L
VIPROT_R
L882C4
0V_TRIG
L882C4_4.1.SCH
DCPROT_L
VIPROT_R
DCPROT_R
INPUT
VIPROT
DCPROT_R
0V_SIG
DCPROT
LS R
0V_LS
OUTPUT
0V_HF
VPOS
VNEG
LS L
TP101
L SIG
R SIG
0V_LS_L
TP102
SK104B
LS R
F
N
PHONO4G
LS L
TP111
0V_LS_L
TP103
TP104
TP105
LS R
TP106
TP112
TP107
TP108
TP109
0V_LS_R
TP110
TP117
3
4
5
L882C2
L882C2_4.1.SCH
+5V_D
0V_D
+5V(D)
+49V
0V_PSU
VPOS
-49V
PWRON
VNEG
THERMPROT
VIPROT_L
THPROT_uC
VIPROT
VIPROT_R
VIPROT_uC
AC PRESENT
0V_TRIG
AC_PRES
DCPROT
DCPROT_L
DCPROT_uC
REMOTE
DCPROT_R
RC5 IN
TRIGGER
TRG IN
D100
1N4003F
SK106
1
2
3
4
AMPCT4
4
SK107
TP118
R103
5
1
2
330R 1W CF
SK105
2
3
TP119
R104
3
4
1
330R 1W CF
TP120
HPSKT
AMPCT4
6
R105
R106
7
100R 1W CF
100R 1W CF
SK100A
SK100B
RLY100A
RLY101A
Top+
Bot+
TP113
TP115
RLY G5Z-2A-E
RLY G5Z-2A-E
Top-
Bot-
CAMCON_G
CAMCON_G
SK101A
SK101B
RLY100B
RLY101B
Top+
Bot+
TP114
TP116
RLY G5Z-2A-E
RLY G5Z-2A-E
Top-
Bot-
CAMCON_G
CAMCON_G
DRAWING TITLE
A85 amplifier and PSU - top sheet
Circuit Diagram
23425
Notes:
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Filename
Cambridge CB5 9PB
L882C1_4.1.PRJ
4
5
6
7
0V_TRIG
5
6
TP121
0V_D
1
2
0V_HF_L
8
7
SP100
STAR_8
RLY100C
RLY101C
D101
RLY G5Z-2A-E
RLY G5Z-2A-E
1N4003F
TR101
R101
TR100
BD179
BD179
100R SM
R102
100R SM
R107
R108
220R SM
220R SM
PCB
PCB
L882PB_4
EL
EARTH LEAD
8M101
EARTH LEAD
02_E062
JBR
20/3/02
LDO REG FITTED TO IC201
02_E035
JBR
4/2/2002
FUSE VALUES UPRATED TO T4A
ECO No.
INITIALS
DATE
Drawn by:
Date Printed
J Reckless
20-Mar-2002
6
7
8
0V_SIG
0V_HF_R
D
0V_LS_R
0V_LS_L
0V_PSU
+49V
C
SPKR1 ON
SPKR2 ON
0V_D
B
A
4.1
4.0
DESCRIPTION OF CHANGE
ISSUE
Sheet
1
of
4
L882C1
DRAWING NO.
8
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