ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No.
DESCRIPTION OF CHANGE
L943C1_5.1.SCH
A80/P80 - Top Level Sheet
Contact Engineer:
L943C1
9-Sep-2003
INITIALS
Printed:
1
8
Sheet
of
Notes:
Contact Tel:
(01223) 203 200
Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
-45V_R
+45V_R
0V(SIG)
-45V_L
+45V_L
0V_LS_L
+4.8V(D)
9VRMS
PWR_ON
-38V_VFD
0V(D)
0V_HF_L
0V_FB_L
0V_FB_R
0V_HF_R
0V_LS_R
+15V(A)
+5V(A)
-15V(A)
0V(PSU)
FIL_1
FIL_2
0V(SIG_2)
Power Supplies
L943C2_5.1.SCH
PRE_OUT_L
0V_FB_L
OUTPUT_L
0V_LS_L
0V_HF_L
VIPROT_L
+45V_L
-45V_L
Power Amp Left
L943C4_5.1.SCH
+45V_L
0V(D)
D100
1N4003
DO-41
TR100
BD179
TO-126
TR101
BD179
TO-126
RLY100A
Omron
G5Z-2AE
RLY101B
Omron
G5Z-2AE
RLY100C
Omron
G5Z-2AE
RLY101C
Omron
G5Z-2AE
RLY100B
Omron
G5Z-2AE
RLY101A
Omron
G5Z-2AE
D101
1N4003
DO-41
2
3
1
NCL
CL
CR
NCR
L
R
SKT100
HOSIDEN
HLJ
Right Outputs
Left Outputs
OUTPUT MUTING
0V_LS_L
0V_LS_R
ITEM100
1
Blank PCB Diva A80 Amp
L943PB
PRE_OUT_R
0V_FB_R
OUTPUT_R
0V_LS_R
0V_HF_R
VIPROT_R
+45V_R
-45V_R
Power Amp Right
L943C5_5.1.SCH
9VRMS
+4.8V(D)
+45V_R
+45V_L
0V(D)
0V_LS_L
0V_LS_R
0V_HF_L
0V_HF_R
0V_FB_R
0V_FB_L
0V(SIG)
-45V_L
-45V_R
-38V_VFD
+15V(A)
-15V(A)
+5V(A)
TAPE_0
VOL_SCLK
0V(SER)
VOL_SDATA
LISTEN_0
LISTEN_1
LISTEN_2
+15V(A)
+5V(A)
-15V(A)
0V(SIG)
0V_FB_R
TAPE_0
TAPE_1
VOL_SCLK
0V(SER)
VOL_SDATA
LISTEN_0
LISTEN_1
LISTEN_2
*PRE_MUTE
0V(D)
+45V_L
-45V_L
0V_HF_L
+45V_R
0V(D)
0V_HF_R
0V_FB_L
-45V_R
-38V_VFD
9VRMS
-45V_L
+4.8V(D)
+45V_L
+45V_R
PreAmp Controls
Power Supplies
Flexfoil
SPKR1_ON
SPKR2_ON
FIL_1
FIL_2
FIL_1
FIL_2
0V(SIG)
FD100
FD101
Q113
Q114
Q115
Q118
TAPE_1
TAPE_2
TAPE_2
A80 & P80 Display Circuitry
L943C8_5.1.SCH
PRE_OUT_L
PRE_OUT_R
0V_PREOUT
0.38Hz_CLK
0V(D)
+4.8V(D)
+45V_L
0V_CHASS
REMOTE_P
TRIG_IN
*RESET
REMOTE_N
A80 Trigger, RC5 & P80 Sig Detect
L943C7_5.1.SCH
0V(D)
+4.8V(D)
-38V_VFD
LISTEN_2
LISTEN_1
LISTEN_0
*PRE_MUTE
VOL_SDATA
VOL_SCLK
TAPE_0
VIPROT_R
VIPROT_L
+45V_R
-45V_L
+45V_L
OUTPUT_L
OUTPUT_R
0V_SER
0V_D_PRE
0V(SIG)
TAPE_1
TAPE_2
0.38Hz_CLK
9VRMS
FIL_1
FIL_2
SPKR2_ON
PWR_ON
SPKR1_ON
*RESET
REMOTE_P
TRIG_IN
+4.8V_D_PRE
VOL_*CS
REMOTE_N
A80/P80 Protection & Micros
L943C6_5.1.SCH
PRE_OUT_L
PRE_OUT_R
LISTEN_2
LISTEN_1
LISTEN_0
*PRE_MUTE
VOL_SDATA
VOL_SCLK
-15V(A)
+15V(A)
+5V(A)
TAPE_2
0V(SIG)
0V_D_PRE
0V_SER
0V_PREOUT
TAPE_1
TAPE_0
+4.8V_D_PRE
*PRE_RLY
VOL_*CS
0V(SIG_2)
A80 PreAmp
L943C3_5.1.SCH
0V(D)
+4.8V(D)
+45V_L
C101
100N
50V
0805
0V(D)
*PRE_MUTE
0V(D)
FIX100
Dia 3.5mm
1
FIX101
Dia 3.5mm
FIX102
Dia 3.5mm
FIX103
Dia 3.5mm
Q121
Q125
ITEM101
1
Tape D/Sided 12MM X 70MM DS Polyester 4965
F205
Placed between VFD and PCB; NF ON P80
R104
330R
1W
CF
R105
330R
1W
CF
R107
100R
1W
CF
R106
100R
1W
CF
RLY102A
NEC
EB2-5NU
RLY102B
NEC
EB2-5NU
RLY102C
NEC
EB2-5NU
HEADPHONE OUTPUT & MUTE
(NF ON P80)
R102
0R0
0W125 0805
R103
0R0
0W125 0805
NF
NF
1
2
3
4
5
CON100
AMP
CT
1
2
3
4
5
CON101
AMP
CT
Q116
Q117
FIX104
Dia 3.2mm
L100
2U2
R100
5R6
2W
CF
L101
2U2
R101
5R6
2W
CF
D102
BAS16
SOT-323
Q106
Q111
ANNOTATION
R110
220R
0W25
MF
R111
220R
0W25
MF
P101
LS100
G P PRECISION
LS101
G P PRECISION
R112
2K2
0W125
0805
R113
2K2
0W125
0805
ITEM102
1
Earth Lead Assy 75MM
8M101
ITEM103
2
Pad Damping 15x6x3MM Sorbothane
E802AP
VOL_*CS
VOL_*CS
R114
0R0
0W25
MF
R108
220R
0W25
MF
R109
220R
0W25
MF
0V(SIG_2)
0V(SIG_2)
Rubber O-Rings fitted over main power supply caps
GENERAL NOTES
This is the Master Schematic for A80 (L943AY) and P80 (L944AY) PCB
assemblies. Any changes to the schematics in this document must be
reflected in the relevant child documents.
These schematics follow a simple heirarchy scheme. Sheet symbols on the top
sheet represent a child or sub-sheet. Net labels on sub-sheets are local or
specific to that sheet. Ports on the sub-sheets connect to sheet entries on
the parent sheet, where they are connected together.
Primary power nets are denoted by type in parenthesis, e.g. 0V(D).
Secondary nets are denoted by underscores, e.g. 0V_LS_L.
To perform an electrical rule check or synchronise with the PCB, set Net
Identifier Scope to Sheet Symbols/Port Connections.
Placed on output relays
Soldered to SKT200
When generating BOMs for L943AY or L944AY, ensure that the relevant
components are fitted or not fitted (those with "NF" or "FIT" in the nearby text).
ITEM104
4
13/16 inch O-Ring
F232
03_E116
TGP
NO CHANGE TO THIS SHEET
2.1
17 APR 03
03_E120
TGP
13 May 03
LEDs, BIAS & DOCUMENTATION CHANGE
3.0
03_E147
MJT
23 May 03
None to this sheet. PCB change.
4.0
03_E230
MJT
04 Aug 03
5.0
A80
Changed P80 s/w & fitted IC socket for IC603 (P80 only).
Display snapoff fixing holes reduced to 3.2mm
03_E264
MJT
09 Sept 03
None to this sheet. Remove EMC can from around IEC inlet.
5.1
