Arcam Diva A-80, Diva P-80 Service manual

Service

ARCAM

Bringing music & movies to life

DiVA

Manual

Issue 1.0

A80 Amplifier
P80 Power Amplifier

ARCAM

Bringing music & movies to life

!

Circuit description

o

A80/P80

!

Technical specifications

Circuit diagrams

!

o L943AY

!

Transformers

o

L916TX – 115/230VAC toroidal

o

L917TX – 100VAC toroidal

o

L907TX – 100VAC frame

!

Exploded view diagram

o

A80

Mechanical & packing parts list

!

o A80
o P80

!

Circuit board silk screen

o

A80

o

P80

!

Circuit board parts list

o

A80/P80 combined

Contents List

Circuit description.

Power supply.

The mains input to the unit is supplied at
filtered the Y Caps and locations C200 /C201 and X
cap at location C209, these are in-place to reduce
mains born HF interference and to prevent bridge
rectifier noise from leaving the unit.

The mains select switch at location
conjunction with the dual primaries on the 115/230v
transformers, the switch allows for the units to be used
in territories running a 115v or 230v grid when the
switch is set to the 115v position the primary windings
are connected in parallel.

Fig 1. Fuse value information.

Fuse location. Value.

FS200 T2.5A (20mm)
FS201 T2.5A (20mm)
FS200 (100v) T3.15A (20mm)
FS201 (100v) T3.15A (20mm)
FS202 (s.m standby 9v a.c rms) T500mA (s.m)
FS203 (D.C inline) T2.0A (20mm)
FS204 (D.C inline) T2.0A (20mm)

The standby Transformer TX200 continuously powers

digital

the
connected to the unit, this supply powers the Micro via
a regulating circuit based around regulator
special mention should be made of fuse FS202 as any
interruption to this supply will render the unit
completely lifeless and as such this circuit should be
checked before inspecting any other areas of the
board.

We will see that the main power transformer
supplies a separate secondary winding for the

–15v analogue

board locations FS203 and FS204, the failure of either
of these fuses will cause the op-amps connected to the
regulated rails to swing D.C. The regulator at location
REG 200 regulates the +15 rail and intern supplies the
+5V(A) analogue supply via the reference Zener at
location

The high level power amp A.C supplies arrive at
Con204 as a 4-wire supply this allows us to implement
a dual bridge network circuit with 4 individually
smoothed D.C rails these are labelled as +45(L),
+45(R) and -45(L), -45(R) we pull a –38v rail from this
point to form the VFD cathode bias voltage via R211
Con205 delivers the 3.3 V A.C supply to the main
board and then onto the display VFD via R203 (2R2
f.u).

DZ200

circuitry (+4.8v(D)) when power is

regulation stages via the two fuses at

and drive transistor

SK200

and is

SW200

TR200.

works in

REG 201

TX200

+15

and

Fig 2. Supply identification and related components.

Supply Related components
+ 45v L
+ 45v R

- 45v L

- 45v R

- 38v VFD
+15v (A)

- 15v (A)

+ 5v (A)
+4.8 (D)

Fil 1/Fil 2

Left power amp positive rail.
Right power amp positive rail.
Left power amp negative rail.
Right power amp negative rail.
Display cathode rail derived from –45v(R)
IC 300, 301, 302, 303, 304, 305, 306,
307, 308, 309 also including the input
clamp diodes all within the pre-amp stage.
IC 300, 301, 302, 303, 304, 305, 306,
307, 308, 309 also including the input
clamp diodes all within the pre-amp stage.
IC309 volume control
Input trigger stages, signal detect IC700,
delayed off IC703, IC701. Main micro
IC600.Remote pickup, Master reset
IC601, Over current detect-AC detect –
thermal cut-out IC600

3.3v~ filament supply.

Pre-amp.

The A80 Pre-amp has inputs for Phono, Aux, CD, Tuner,
AV, DVD and Tape. All inputs except Phono have a simple
resistor-capacitor 340Khz low pass filter to remove any
unwanted high frequency noise from the input signal/local
area, a pair of diodes on each input connected to the
+15/-15v rails prevent damage to the CMOS input
switching chips at locations IC300 and IC301, if any offset
is seen at the input the switching chips on a given input we
may suspect the failure of one of the input diodes.

Fig 3. Logic status of IC302 and 303 (switching chip).

Low= 0V High=4.8 (Cmos).

Input. A0
Phono
Aux
CD
Tuner
AV
DVD
Tape

The outputs of IC300 (L) and IC301(R) can be seen on pin
8 as a current signal and such this can not be viewed via
CRO although a 100 ohm resistor inline with the scope
probe may yield some results, from here we drive into line
drive op-amp IC307 (L) and IC308 (R) signal can be seen
at the output pin (1) and travelling into the volume control
chip (IC309) on pins 16 (L) and 9 (R) the output from the
Volume control is driven into IC307 at pin 6 (L) and IC308
pin 6 (R) and seen again on pins 7 on both IC307 and
IC308. After the Con 302 and Con 303 we drive directly

(pin 1)

Low Low Low

Low High Low

High High Low

Low Low High

High Low High

Low High High

High Low Low

A1

(pin 16)

A2

(pin 15)

Into the power amp stages but from this point we can
configure the unit as a separate Pre amp/Power amp
by moving the jumpers to the pin 2 and 3 of Con 304
and Con 305, and then remove the jumpers at Con
302 and Con 303 this may also be of use when fault
finding as we can effectively isolate the and D.C
offset/distortion problems coming from the Pre amp
stage to the power amp stages and test these stages
as a separate entity.

The Pre amp power up mute and power down mute is
controlled by the relay at location RLY300 A/B the
relay also triggers to mute the switching noise when
switching between inputs (see micro control/protection
and display section).

Power amp stages.

The main power amplifiers are of a Class A/B design
which use SAP “audio” transistors in a asymmetrical
current feedback configuration, Input and feedback
paths are D.C coupled and there is a active integrating
servo to remove D.C offsets from the outputs.

The basic principle of operation is as follows: Left
channel description given only, read all references as
5xx for the right channel.

The input level of the power amp stage is clamped by
the 3V9 zener diodes at positions DZ402 and DZ403
this protects the power amp input stages from gross
overload and subsequent damage R410 and R402 and
C416 in parallel form a 340khz filter.

IC400A is a V-I converter with a gain of 2 it’s output
will be a accurate amplification of it’s input voltage (i.e
the output voltage at pin 1 will be identical to the input
at pin 3 but twice the amplitude) the output voltage is
driven unto a 44 ohm load formed by R445 and R446
this op-amp is used in a slightly unusual configuration
in that it’s power supply pins are used as a current
output and the output pin is used as a current
feedback. Transistors TR404 and TR408 supply the +/­15v rails and act as cascades to pass it’s supply pin
currents through to the current mirrors.

The “feedback current” flows back from the power amp
output via R447-R450 to allow IC400A to swing it’s
output, this is why the term current feedback is used –
it’s is the current flowing in the feedback resistors that
sets the overall gain of the amplifier.

IC400B acts as an inverting integrator and it’s purpose
is to remove DC from the loudspeaker outputs. Any
positive D.C offset will cause the output of IC400B to
go negative thus increasing the current in it’s negative
supply pin and pulling the output voltage back to zero
R420 and C442 set the time constant of the integrator
so that audio frequencies are ignored

The transistors found at locations TR400 and
TR401/TR402 form the PNP Wilson mirrors and TR416
and TR411/TR417 form the Wilson NPN current mirrors,
emitter degeneration is provided by R405, R406 (+) and
R407, R408 (-).

R415 and R416 decouple the current mirror stages from
the main power supply stages to allow the bootstrap circuit
to operate this circuit is formed by C423 and C424 and the
Metal film 1 watt resistors at locations R452/R453, the
boots strap is provided to allow the output stage rails to go
up and down slightly with the output signal to the
loudspeaker, this enables the driver stage to fully saturate
the output drivers giving the greatest output and the best
thermal efficiency.

TR405 and TR407 are the Pre-drivers, TR412/TR414 and
R411/R434 provide a current limit of about 30mA under
fault conditions. R423 and R428 loosely couple the
outputs of the output drivers to the inputs of the SAP
output devices, this allows the output devices inbuilt
temperature sensing diodes to accurately control the
quiescent current of the output drivers as the temperature
varies, C425 and C405 ensure that both halves of the
output stage receive an equal A.C component.

The output transistors are TR413 and TR415 these are
specially designed for audio power use Sanken SAP15N
and SAP15P devices they provide a inbuilt 0W22 thick film
power resistor and temperature sensing diodes that track
the V

BE

versus temperature characteristics of the power
transistors allowing for accurate control of the quiescent
current.

R459 and C427 form the Zobel network which is provided
to ensure that the amplifier see a constant and resistive
load at high frequencies C421 locally couples the “High
frequency” and signal grounds together at the input stage
for the same reason. Any signs of burning or scorching of
R459 will indicate that the unit amplifier channel(s) have
been running unstable or oscillating.

The Bias should be set for minimum distortion (THD+N)
using a 0.5v rms 20 Khz sine wave into the CD input with
the amplifier set for full gain, the absolute maximum level
of Bias acceptable is 22mV measure across CON401 (L)
or CON 501 (R) the adjustment is made using RV400 and
RV500 we set the bias at the factory using an extremely
accurate Audio Precision-audio analyser.

If you do not have access to a distortion level meter
capable of 0.05% or better accuracy you may be able to
rough set the amplifier to a typical reading of 15mV (at
cold switch on).

Fig 4. Suggested blanket replacement parts for

power amp failures.

Location Description Model Part no.

TR413 Output driver + SAP15NY 4CSAP15N
TR415 Output driver - SAP15PY 4CSAP15P
TR410 Predriver + FMMT 497 4AFMMT497
TR412 Predriver + ZDT 6758 4AZDT6758
TR414 Predriver - ZDT 758 4AZDT758
TR405 Predriver - FMMT 597 4AFMMT597
TR401 Current mirror PNP BC859B 4A859
TR402 Current mirror PNP FMMT 597 4AFMMT597
TR411 Current mirror NPN FMMT 497 4AFMMT497
TR417 Current mirror NPN BC849B 4A849B
TR412 Driver bias + ZDT 6758 4AZDT758

Fig 4a. SAP NY/PY output driver information.

SAP 15NY SAP 15PY

Under output driver failure conditions the 0.22 internal emitter
resistor will usually go open, the resistor should be measured between
pins S and E.

S-E = 0.22 ohm.

Micro control/protection and display.

The micro is tasked with providing an instantaneous safe
operating area for both the amplifier and loudspeaker by
monitoring the below areas.

o D.C
o Over current
o

at both left and right channel outputs.

within either power amp stage.

Over temp

detection for both power amp stages.

o A.C present detection.

Please see fig 5. For voltage readings with regards to the protection

operations.

Within the A80 integrated amplifier these tasks are
performed by the H8 type micro at circuit location IC602,
within the P80 power amp version the tasks are performed
by the PIC micro at location IC603, the protection lines are
“daisy chained” to both micros regardless of witch one is
fitted.

To operate both micros require a constant stable supply
voltage, this is derived from the

+4.8v(D)

rail from
transformer TX200 and via regulator REG201 this supply
should be constant at anytime mains appears at the
amplifier power input.

Please note: This supply is protected from over-current
and over-voltage operation by the surface mount fuse at
location

FS202

T500mA and as such if the Amplifier fails
to power up this supply should be checked before making
any further investigations.

We also need to see a

X600

.

4.00 Mhz

clock at crystal location

The micro interfaces with the pre-amp stage input
selection

(see Fig 3)

and the volume control level
adjustment we also drive the VFD via the display
drive/keyboard scan micro at location IC800.

IC602 receives Keyboard scan data and RC5 from the
remote pick-up diode at location RX800. The
power on
switches

reset

can be found on the display board and

HI

(4.8v) after mains in.

master

Fig 5. Working status of protection lines and fault
status

.

Low =0v High = 4.8 (Cmos).

Location Fault Line Output pin Working

IC 601A AC present 2 High
IC 600A Over current 3 Low
IC 600B Therm prot (L) 6 High
IC 600D Therm prot (R) 11 High
IC 600C Therm prot main 8 Low
R634 D.C prot (L) N/A Low (D.C)
R635 D.C prot (R) N/A Low (D.C)
R663 D.C prot combined N/A Low

The Protection

is live at all times that even in standby
due to the fact that all chips related with these
functions are driven from the 4.8(D) supply rails.
As we can see from

Fig 4

we can isolate the left and
right channel protection lines for both over current and
D.C offset by looking at the protection lines before they
are mixed into single fault status lines for the micro at
location IC600 this will allow us to identify the channel
that is “flagging the fault”.

Both versions of the Amplifier have the ability to warn
the user and/or engineer of a internal fault, the A80 will
use both the Power LED and front panel display, the
P80 has no display and as such uses the sequence of
LED flash codes listed below in Fig 7.

Fig 6. A80 fault alert information.

Power LED status Fault indicated

LED red during start up DC offset fault
Led red during normal use Fault as shown on display

Fig 7. P80 fault alert information.

Power LED status Fault indicated

LED flashing green DC offset (left or right)
Flashing red Short circuit fault (over current)
Flash amber Thermal fault (heatsink L or R)
Red on flash green Multiple protection lines triggered

The Micro has direct control over all internal relays for
protection and output control, the speaker relay control
lines can be seen on the diagram as SPKR1 for SP1
and the SPKR2 for SP2 outputs, these lines switch
High to engage the relay.

The A80 pre-amp relay should disengage when
switching inputs to prevent any chip switching noise
from leaving the pre-amp stage the control line can be
seen on R385 and switches High to engage the relay.

Signal Detect and Delayed off – P80 only.

Signal detection is achieved by amplifying the signal
present at the power amp inputs by a large amount
using two channels of a quad op-amp at location
IC700 A/B the outputs of this op-amp are summed by
a non-inverting comparator formed using the two
remaining op-amp channels these will produce a active
High reset pulse at the output pin 14.

When mains is plugged into the P80, the master
*Reset line goes low and the 0.38Hz clock starts
ticking. The *Reset pulse resets the latch effecting a
HIGH *Q output and thus a LOW circuit output. When
the signal detect Latch and Counter Reset go HIGH
(an input is detected), the *SD latch input is driven
LOW by the inverter and *Q goes LOW the circuit
output then goes high switching the Amplifier on.

If the Amplifier does not see audio on it’s Power amp
inputs for either 12 or 45 minutes (this can be user
configured by moving the jumper at position CON702) the
Amplifier will auto switch into standby.

Jumper settings.

If you want to turn the A80 into a separate Pre-Power amp
(make the Line out become a Pre-amp out and make the
pre-out become a power amp in) adjust the setting of the
following links.

Remove the jumpers from Con 302 and Con 305 (this
disconnects the pre-amp output from the power amp input)
Fit jumpers on pins 2 & 3 of Con 304 & Con 305
(disconnects the line output buffer from the line out
sockets and connects the pre out sockets to the line out
sockets)

You can change the Phono input of the A80 into a AUX2
input by fitting jumpers on pins 2 & 3 of Con 306 an Con
307 this routes the signal directly from the Phono inputs
into a separate set of inputs on the pre-amp switches
IC302 and IC303.

We need to enable the AUX2 input by pressing AV,TAPE
and PHONO now use the rotary encoder to change the
selection, press confirm to select the new setting.

Con 400 and Con 500 are for the Bias setting and should
not be altered, if in doubt you should not measure more
than 22mV

across Con 401 and Con 501 when the
amplifier is idle and this should be adjustable using RV400
and RV500 (L&R channels).

Con 601 and Con 602 are for re-programming (move the
jumper from Con 601 to Con 602 when reprogramming
otherwise the jumper should be on Con 601).

Con 700 and Con 701 are used to set the P80 signal
detect sensitivity as default the link is fitted giving a input
sensitivity of roughly ~500uV if the jumpers are removed
the sensitivity decreases roughly x4 to 2mV this setting
can be used for operation with noisy source equipment.

Con 702 is used to set the time coefficient of the auto
power off delay, the default pins are 1 & 2 this gives a
delay of 12 minutes until the amp powers down under a no
signal period, if we place the jumpers on pin 2 & 3 this
time increases to 45 minutes +/- 20%.

Fig 8. Jumper settings.

Jumper A80 P80

Con 300, Con 301 Not fitted Fitted
Con 302, Con303 Fit (NF for pre/pwr) Not fitted
Con 304, Con 305 1&2 (2&3 for

pre/pwr)

Con 306, Con 307 1&2Phono;(2&3

Aux2)
Con 400,Con 500 Factory set Factory set
Con 601 Fit (NF to program) Not fitted
Con 602 Fit (NF to program) Not fitted
Con 700, Con 701 Not fitted Fit (0.5mv), NF (2mV)
Con 702 Not fitted 1&2 (12 mins; 2&3

Not fitted

Not fitted

45mins).

Fig 9. Major components pin identification.

74HC14

TLO 72

ZDT 758/ZDT 6758

1=Collector 1
2=Collector 1
3=Collector 2
4=Collector 2
5=Emitter 2
6=Base 2
7=Emitter 1
8=Base 1

FMMT 497/597

NJM2114

DG408DY

74HC00D

BC849/BC859

3=Collector

1=Anode
2=Cathode
3=Common connection

1=Base
2=Emitter

BAV99 Diode package

LM431 Adjustable Zener shunt regulator

Technical Specifications.

Continuous Power output

Both channels driven 8 ohms 20 Hz – 20 kHz = 65 Watts

Single Channel driven 4 ohms 20 Hz – 20 kHz = 80 Watts

Distortion 8 ohms at 80% power output 1Khz = 0.008%

Input stage specifications.

RIAA input stage sensitivity (M.M) = 2.5 mV

Line input sensitivity = 630 mV (Default)

Input impedance = 22k ohms

Signal to noise ratio CCIR weighted (2 volt input) = 105dB

Pre-amp output specifications.

Nominal output level = 610 mV

Output impedance = < 3 ohms

FD100 FD101

LS100
G P PRECISION

Left Outputs

ITEM100 1 Blank PCB Diva A8 0 AmpL943PB
ITEM101 1 Tape D/Sided 12MM X 70MM DS Polyester 4965F205 Placed between VFD and PCB; NF ON P80
ITEM102 1 Earth Lead Assy 75MM8M101
ITEM103 2 Pad Damping 15x6x3MM SorbothaneE802AP
ITEM104 4 13/16 inch O-RingF232

Soldered to SKT200
Placed on output relays
Rubber O-Rings fitted over main power supply caps

ANNOTATION

FIX100
Dia 3.5mm

Power Supplies
L943C2_5.1.SCH

A80 PreAmp
L943C3_5.1.SCH

PWR_ON

FIX101
Dia 3.5mm

1

P101

0V(D)

+4.8V(D)

0V_LS_L
0V_HF_L
0V_FB_L

0V(SIG_2)

0V_FB_R
0V_HF_R
0V_LS_R

0V(PSU)

-38V_VFD

0V_PREOUT

*PRE_MUTE

0V_D_PRE

TAPE_0
TAPE_1
TAPE_2

VOL_SCLK

0V_SER

VOL_SDATA

VOL_*CS

LISTEN_0
LISTEN_1
LISTEN_2

+15V(A)

+5V(A)

+4.8V_D_PRE

*PRE_RLY

0V(SIG)

0V(SIG_2)

-15V(A)
PRE_OUT_L
PRE_OUT_R

C101
100N
50V
0805

9VRMS

+45V_R

+45V_L

0V(D)

0V(SIG)

-45V_L

-45V_R

FIL_1
FIL_2

+15V(A)

+5V(A)

-15V(A)

FIX102
Dia 3.5mm

FIX103
Dia 3.5mm

*PRE_MUTE
0V(D)

TAPE_0
TAPE_1
TAPE_2

VOL_SCLK
0V(SER)
VOL_SDATA
VOL_*CS

LISTEN_0
LISTEN_1
LISTEN_2

FIX104
Dia 3.2mm

9VRMS
+4.8V(D)

+45V_R
+45V_L

0V(D)
0V_LS_L
0V_HF_L
0V_FB_L
0V(SIG)
0V(SIG_2)

0V_FB_R
0V_HF_R
0V_LS_R

-45V_L

-45V_R

-38V_VFD
FIL_1
FIL_2

+15V(A)
+5V(A)

-15V(A)

TAPE_0
TAPE_1
TAPE_2

PreAmp Controls

VOL_SCLK
0V(SER)
VOL_SDATA

LISTEN_0
LISTEN_1
LISTEN_2

0V(D)
*PRE_MUTE
VOL_*CS

+15V(A)
+5V(A)

0V(SIG)
0V(SIG_2)

-15V(A)

+45V_L

0V_FB_L

-45V_L
0V_HF_L
0V_LS_L

Power Supplies

+45V_R

0V_FB_R

-45V_R
0V_HF_R
0V_LS_R

+45V_L
+4.8V(D)
0V(D)

+45V_L
+45V_R
+4.8V(D)
0V(D)

0V(SIG)

-45V_L

-38V_VFD
FIL_1
FIL_2

9VRMS

+45V_L
0V(D)

Power Amp Left
L943C4_5.1.SCH

PRE_OUT_L

0V_FB_L

Power Amp Right
L943C5_5.1.SCH

PRE_OUT_R

0V_FB_R

A80/P80 Protection & Micros
L943C6_5.1.SCH

OUTPUT_L
OUTPUT_R

+45V_L
+45V_R
+4.8V(D)
0V(D)

0V(SIG)

-45V_L

-38V_VFD
FIL_1
FIL_2

TAPE_0
TAPE_1
TAPE_2
VOL_SCLK
0V_SER
VOL_SDATA

LISTEN_0
LISTEN_1
LISTEN_2
+4.8V_D_PRE
0V_D_PRE
*PRE_MUTE
VOL_*CS
VIPROT_L
VIPROT_R
9VRMS

REMOTE_P
REMOTE_N
TRIG_IN

VIPROT_L

OUTPUT_L

0V_LS_L
0V_HF_L

VIPROT_R

OUTPUT_R

0V_LS_R

0V_HF_R

0.38Hz_CLK

SPKR2_ON
SPKR1_ON

PWR_ON

+45V_L

-45V_L

+45V_R

-45V_R

*RESET

R100
5R6

2W
CF

L100
2U2

R101
5R6

2W
CF

L101
2U2

RLY100A
Omron

G5Z-2AE
RLY101A

Omron
G5Z-2AE

RLY100B

Omron

G5Z-2AE
RLY101B

Omron
G5Z-2AE

A80 Trigger, RC5 & P80 Sig Detect
L943C7_5.1.SCH

+45V_L
+4.8V(D)
0V(D)
0V_CHASS

0.38Hz_CLK
*RESET

PRE_OUT_L
0V_PREOUT
PRE_OUT_R

REMOTE_P
REMOTE_N

TRIG_IN

LS101
G P PRECISION

Right Outputs

R105
330R
1W
CF

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.

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).

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.

R104
330R
1W
CF

Q121
Q125

Q106
Q111

CON100
1
2
3
4
5

AMP

CT

CON101

AMP
CT

HEADPHONE OUTPUT & MUTE

1

Q113

2

Q114

3

Q115Q118

4

Q116

5

Q117

R107
100R
1W
CF

(NF ON P80)

R106
100R
1W
CF

RLY102A
NEC
EB2-5NU

RLY102B
NEC

EB2-5NU

RLY102C
NEC
EB2-5NU

NF

R102 0R0
0W125 0805

NF

R103 0R0
0W125 0805

D102
BAS16
SOT-323

NCL

NCR

CL

CR

SKT100

2
3
1

HOSIDEN
HLJ

OUTPUT MUTING

SPKR2_ON

SPKR1_ON

R108 220R
0W25 MF
R109 220R
0W25 MF

D100
1N4003
DO-41

RLY100C
Omron

G5Z-2AE

TR100
BD179
TO-126

R110
220R
0W25
MF

R114
0R0
0W25
MF

RLY101C
Omron

G5Z-2AE

R112
2K2
0W125
0805

TR101
BD179
TO-126

R111
220R
0W25
MF

R113
2K2
0W125
0805

D101
1N4003
DO-41

L
R

A80 & P80 Display Circuitr y
L943C8_5.1.SCH

Flexfoil

DRAWING TITLE

23425

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A80/P80 - T op Lev el Sheet

Filename:

L943C1_5.1.SCH

Notes:

A80

Contact Engineer:

03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1
03_E230 MJT 04 Aug 03 5.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03

INITIALS

ECO No. DESCRI PT I O N O F CHANGE

Contact Tel: [phone]Mark Tweedale

Printed:

Changed P80 s/w & fitted IC socket for IC603 (P80 only).
Display snapoff fixing holes reduced to 3.2mm

DATE

9-Sep-2003

18Sheet of

DRAWING NO.

L943C1

ISSUE

SH200

EMC Shield

NF

SKT200

N
E
L

BULGIN
PX0580

1

This EMC can should now not appear
on any BoM as there is a safety
issue regarding the can shorting to a
live mains track on the top layer.

Consider removing the holes for the
can or perhaps move mains tracks
onto bottom layer for next PCB
revision.

C200
3N3
250V
CER

C201
3N3
250V
CER

EARTH

NEUTRAL

LIVE

C209

115V 230V

220N
275V
PP X2

2A22B

1A11B

SW200
18-000-0019

FS201
T2.5A
S506

FHLDR201
20mm HLDR

FS200
T2.5A
S506

FHLDR200
20mm HLDR

MAINS WIRING AND AUXILIARY SUPPLY

TX200

1 5

9V

9V

PCB Mount Frame

7A9301

CON201
WAGO
256

3

BLUE

2

DK GREY

1

ORANGE

1

GREEN

CON202
WAGO
256

CON203

1

GREEN

WAGO
256

6

FS202
T500mA

R452

8

FIX200
Dia 3.2mm

C202
3N3

250V
CER

C203
3N3
250V
CER

1

RLY200A
Takamisawa
F1CA005V

RLY200B
Takamisawa
F1CA005V

115V

2
3 7

115V

4

C221
100N
100V
MKS2

L916TX

(CHASSIS-MOUNTED)

BLUE

BLUE

115V ac
BLACK

ORANGE

115V ac
GREEN

GREEN/YELLOW
Interwinding Screen

WHITE
BLACK

GREY

WHITE

3.2Vac
WHITE

ORANGE
16Vac
BLUE
16Vac
ORANGE

DBR203
3BDF01M

C225
1000UF
25V
YK

HS201A
SW50-2

8.8C/W

CON204

WAGO
256

REG201
LM317T

TO-220

BLUE
LT GREY
DK GREY

GREY

D214
BAS16
SOT-323

ADJ

R217
680R
0W125
0805

1
2
3
4

ITEM203 1 Clip For SW Profil e Heats inkF006

+4.8V(D)

R218
220R
0W25
MF

R219
22R
0W125
0805

0V(D)

0V(D)

C205
470N
100V
MKS2

PCB Traces to route as shown h ere

C206
470N
100V
MKS2

C226
1000UF
10V
YK

9VRMS

+4.8V(D)

POWER AMP SUPPLIES

SP200

DBR200
GBU8D

DBR201
GBU8D

SP201

C228
3,300UF
63V
USR

C230
3,300UF
63V
USR

PWR_ON

C229
3,300UF
63V
USR

C231
3,300UF
63V
USR

R216
2K2

0W125
0805

P202

+4.8V(D)

0V(D)

RLY200C
Takamisawa
F1CA005V

TR202
FMMT497
SOT-23

R221 0R0
0W125 0805

SP202

D215
BAS16
SOT-323

0V(SIG)
0V(D)
0V_FB_R
0V_LS_L
0V_LS_R

0V_HF_R
0V_HF_L

0V_FB_L

+45V_R
+45V_L

0V(SIG)

0V(D)

0V_FB_R
0V_LS_L
0V_LS_R

0V_HF_R
0V_HF_L

0V(PSU)

0V_FB_L

-45V_L

-45V_R

ANNOTATION

CON200

ORANGE

BLUE

ORANGE

WAGO 256

ANALOGUE OP-AMP SUPPLIES

FS203
T2A

R452

C204
470N
100V

FS204
T2A

R452

MKS2

1
2
3

C211
100N
50V
0805

C210
100N
50V
0805

D200
1N4003
DO-41

D202
1N4003
DO-41

(NF ON P80)

D201
1N4003
DO-41

D203
1N4003
DO-41

R204
0R0

0W125
0805

R205
0R0

0W125
0805

C215
1000UF
35V
YK

C216
1000UF
35V
YK

C214
100N
50V
0805

C213
100N
50V
0805

HS200A
6043PB
23C/W

HS202A
6043PB
23C/W

D210
BAS16
SOT-323

REG200
LM317T

ADJ

TO-220

C217
100UF
25V
YK

C218
100UF
25V
YK

REG202
LM337T

ADJ

TO-220

D211
BAS16
SOT-323

P200

P201

R207
100R
0W125
0805

R208
100R
0W125
0805

R213
2K2
0W125
0805

R214
2K2
0W125
0805

R209
100R
0W125
0805

R210
100R
0W125
0805

D212
BAS16
SOT-323

D213
BAS16
SOT-323

C207
22UF
20V
OSCON

C208
22UF
20V
OSCON

R206
10R
0W125
0805

C224
1000UF
25V
YK

R215
2K2
0W125
0805

DZ200
BZX84C
5V6
SOT-23

TR200
BC849B
SOT-23

SP203

C219
100UF
25V
YK

0V(SIG_2)

+15V(A)

+5V(A)

+4.6V to +5.3V

C220
100UF
25V
YK

0V(SIG)

Track by pre-out to pwr-in

0V(SIG_2)

For preamp bulk decoupling

-15V(A)

CON205

WAGO
256

2

GREY

1

GREY

DRAWING TITLE

23425

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

R203
2R2

0W33
FU

A80/P80 Power Supplies

Filename:
Notes:

Contact Engineer:

VFD SUPPLY

(NF ON P80)

C222
100N
50V
0805

L943C2_5.1.SCH

A80

C212

0V(D)

22UF

28Sheet of

63V
YK

DRAWING NO.

-38V_VFD

FIL_1

FIL_2

ISSUE

L943C2

R211
1K0

0805
0W125

03_E264 MJT 09 Sept 03 Remove EMC can from around IEC inlet. 5.1
03_E230 MJT 04 Aug 03 None to this sheet. Display snapoff fixing holes reduced to 3.2mm 5.0
03_E147 MJT 23 May 03 Removed double connection from R221 to star point. PCB change. 4.0
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E116 TGP R204, R205 CHANGED FROM 2R2 TO 0R 2.117 APR 03

INITIALS
Printed:

DATE

9-Sep-2003

Contact Tel: [phone]Mark Tweedale

ECO No. DESCRI PT I O N O F CHANGE

0V_LS_L

DZ406
BZX84C
3V9
SOT-23

+45V_L

ANNOTATION

VIPROT_L

OUTPUT_L

0V_LS_L

0V_HF_L

-45V_L

->

R405
47R
0W125
0805

C417
100N
50V
0805

C416
470P
100V
FKP2

DZ405
BZX84C
15V
SOT-23

C420
100N
50V
0805

P401

3

2

84

TR408
FMMT497
SOT-23

Q403

IC400A
TL072CD
SO-8

Q409

TR404
FMMT597
SOT-23

R400
22K
0W125
0805

C410
100UF
25V
YK

0V_HF_L

INPUT FILTER V TO I AMP

PRE_OUT_L

P415

SHEET 3

0V_FB_L

DZ402
BZX84C
3V9
SOT-23

DZ403
BZX84C
3V9
SOT-23

0V_HF_L

R410
1K0

0W125
0805

C419
100N
50V
0805

C414
100UF
25V
YK

DZ404
BZX84C
15V
SOT-23

R402
22K
0W125
0805

0V_HF_L

0V_FB_L

0V_FB_L

TR400
BC859B
SOT-23

1

0V_FB_L

D400
BAS16
SOT-323

NF

C400

P402

47P
100V
0805

R443
4K7
0W125
0805

0V_FB_L 0V_FB_L

R445
22R
0W25
MF

R446
22R
0W25
MF

NF

C401

P433
47P
100V
0805

PNP CURRENT MIRROR

NF

R409
1K0

0W125
0805

INTEGRATING DC SERVO

C422

470N
100V
MKS2

7

IC400B
TL072CD
SO-8

NF

R451 18K
0W25 MF

R447
820R

0W25
MF

R448
820R

0W25
MF

NF

R412
1K0

0W125
0805

NPN CURRENT MIRROR

P454

R407
47R
0W125
0805

TR416
BC849B
SOT-23

D404
BAS16
SOT-323

R404
22K
0W125
0805

R415
220R
0W25
MF

R406
47R
0W125
0805

P408

TR401
BC859B
SOT-23

P409

R437
5K6
0W125
0805

P459

TR402
FMMT597
SOT-23

P407

NF

R419
470K
0W125
0805

0V_FB_L

TR412B
ZDT6758
SM-8

REF400

LM431AIM3
SOT-23

PRE DRIVER BIAS
& TEMP. COMP.

TR414A
ZDT758
SM-8

R433
22R
0W125
0805

P442

TR411
FMMT497
SOT-23

P458

TR417
BC849B
SOT-23

R408
47R
0W125
0805

P404

R418
1K0

0W125
0805

P405

123

R440 4K7

0W125 0805
R403 10K
0W125 0805

R439
22K
0W125
0805

C415
100UF
25V
YK

P438

C402

100P
100V
0805

P439

C403

100P
100V
0805

R460
330R
0W125
0805

R413
1K0
0W125
0805

P440

R417
1K0

0W125
0805

R420
1M0

0W125
0805

6

D409

P420

5

BAV99
SOT-23

NF

R458 18K

R416
220R
0W25
MF

0W25 MF

C406
10N
100V
0805

CON400
HARWIN
M20-973

*

P456

R449
820R

0W25
MF

R450
820R

0W25
MF

~1.6V

0V_FB_L

0V_FB_L

C411
100UF
25V
YK

NF

R421
470K
0W125
0805

C404
10N
100V
0805

0V_FB_L

C407
10N
100V
0805

BOOTSTRAPBOOTSTRAP

PRE DRIVER

TR407
FMMT497
SOT-23

C423
100UF
100V
YK

R452
1K0
1W
CF

R453
1K0
1W
CF

C424
100UF
100V
YK

TR405
FMMT597
SOT-23

PRE DRIVER

P410

P444

R422
100R

0W125
0805

R427
100R

0W125
0805

D405
1N4003
DO-41

C425
10UF
50V
YK

D408
1N4003
DO-41

TR412A
ZDT6758
SM-8

P411

R431
22R
0W125
0805

R423
220R
0W25
MF

D401
BAS16
SOT-323

BIAS MEASURE BIAS

ADJUST

C405
10N
100V
0805

R428
220R
0W25
MF

R434
22R
0W125
0805

P400

TR414B
ZDT758
SM-8

TR413

SAP15NY
SAP

RV400
220R
LIN

TR415

SAP15PY
SAP

C408
22UF
63V
YK

0V_HF_L

DZ400
22V
BZX84C
SOT-23

P403

OUTPUT STAGE V-I PROTECTION

R438
10K
0W125
0805

R456

R411
1K0
0W125
0805

R454
100K
0W125
0805

R414
1K0
0W125
0805

CON401
HARWIN
M20-973

1
2

330R
0W125
0805

R457
330R

0W125
0805

P427

P449

R424
100R
0W125
0805

R429
100R
0W125
0805

R432
22R
0W125
0805

C412
100UF
25V
YK

C413
100UF
25V
YK

R435
22R
0W125
0805

R441
10K
0W125
0805

R425
100R

0W125
0805

R430
100R

0W125
0805

P429

P451

V-I PROTECTION

P406

DZ401
22V
BZX84C
SOT-23

0V_HF_L

C409
22UF
63V
YK

D402
BAS16
SOT-323

P430

TR409
FMMT497
SOT-23

TR406
FMMT597
SOT-23

P452

D403
BAS16
SOT-323

R426
100R

0W125
0805

D406
1N4003
DO-41

D407
1N4003
DO-41

P431

P413

R436
10K
0W125
0805

R442
4K7
0W125
0805

P432

TR410
FMMT497
SOT-23

0V_HF_L

0V_HF_L

TR403
FMMT597
SOT-23

P414

R401
10K
0W125
0805

R444
10K
0W125
0805

R459
5R6
2W
CF

ZOBEL NETWORK

C427
100N
100V
MKS2

VI PROTECT
SIGNAL TO MICRO

C426
10UF
50V
YK

OUT_L

C421

100N
50V
0805

ITEM400 1 Con Jumper Socket 0.1IN Gold Blue8K004

* - Default jumper setting on pins 2 & 3; fit jumper
on pins 1 & 2 to increase bias voltage;
remove jumper to decrease bias voltage

DRAWING TITLE

23425

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A80/P80 - Po wer Amp Left

Filename:

L943C4_5.1.SCH

Notes:

A80

Contact Engineer:

03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1
03_E230 MJT 04 Aug 03 None to this sheet. Display snapoff fixing holes reduced to 3.2mm 5.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03

INITIALS
Printed:

DATE

9-Sep-2003

48Sheet of

DRAWING NO.

L943C4

Contact Tel: [phone]Mark Tweedale

ECO No. DESCRI PT I O N O F CHANGE

ISSUE

->

R505
47R
0W125

R500
22K
0W125
0805

0V_FB_R

0V_FB_R

C517
100N
50V
0805

C516
470P
100V
FKP2

DZ505
BZX84C
15V
SOT-23

C520
100N
50V
0805

C510
100UF
25V
YK

0V_HF_R

INPUT FILTER V TO I AMP

PRE_OUT_R

P515

SHEET 3

0V_FB_R

DZ502
BZX84C
3V9
SOT-23

DZ503
BZX84C
3V9
SOT-23

0V_HF_R

R510
1K0

0W125
0805

C519
100N
50V
0805

C514
100UF
25V
YK

DZ504
BZX84C
15V
SOT-23

R502
22K
0W125
0805

0V_HF_R

0805

P501

TR508
FMMT497
SOT-23

Q503

IC500A
TL072CD

84

3

SO-8

2

Q509

TR504
FMMT597
SOT-23

TR500
BC859B
SOT-23

1

0V_FB_R

R545
22R
0W25
MF

R546
22R
0W25
MF

D500
BAS16
SOT-323

NF

C500

47P
100V
0805

NF

C501

47P
100V
0805

NF

R509

P502

1K0
0W125
0805

INTEGRATING DC SERVO

C522

470N
100V
MKS2

7

R543

IC500B

4K7

TL072CD

0W125

SO-8

0805

NF

R551 18K
0W25 MF

R547
820R

0W25
MF

R548
820R

0W25
MF

P533

PNP CURRENT MIRROR

NF

R512
1K0

0W125
0805

NPN CURRENT MIRROR

P554

R507
47R
0W125
0805

TR516
BC849B
SOT-23

D504
BAS16
SOT-323

R504
22K
0W125
0805

R515
220R
0W25
MF

R506
47R
0W125
0805

P508

TR501
BC859B
SOT-23

P509

P507

R537
5K6
0W125
0805

P559

TR502
FMMT597
SOT-23

NF

R519
470K
0W125
0805

0V_FB_R

TR512B
ZDT6758
SM-8

REF500

LM431AIM3
SOT-23

PRE DRIVER BIAS
& TEMP. COMP.

TR514A
ZDT758
SM-8

R533
22R
0W125
0805

P542

TR511
FMMT497
SOT-23

P558

TR517
BC849B
SOT-23

R508
47R
0W125
0805

P504

C502

R517

P505

1K0

100P

0W125

100V

0805

0805

R520
1M0

0W125
0805

6

D509

P520 P527

5

BAV99
SOT-23

0V_FB_R0V_FB_R

NF

R558 18K

R516
220R
0W25
MF

0W25 MF

C506
10N
100V
0805

CON500
HARWIN
M20-973

*

P556

R518
1K0

0W125
0805

123

R540 4K7

0W125 0805
R503 10K
0W125 0805

R539
22K
0W125
0805

P539
C515
100UF
25V
YK

P538

R560
330R
0W125
0805

R513
1K0
0W125
0805

C503

100P
100V
0805

P540

R549
820R

0W25
MF

R550
820R

0W25
MF

~1.6V

0V_FB_R

0V_FB_R

C511
100UF
25V
YK

NF

R521
470K
0W125
0805

0V_FB_R

C504
10N
100V
0805

C507
10N
100V
0805

BOOTSTRAPBOOTSTRAP

PRE DRIVER

TR507
FMMT497
SOT-23

C523
100UF
100V
YK

R552
1K0
1W
CF

R553
1K0
1W
CF

C524
100UF
100V
YK

TR505
FMMT597
SOT-23

PRE DRIVER

P510

P544

R522
100R

0W125
0805

R527
100R

0W125
0805

D505
1N4003
DO-41

C525
10UF
50V
YK

D508
1N4003
DO-41

TR512A
ZDT6758
SM-8

P511

R531
22R
0W125
0805

R523
220R
0W25
MF

D501
BAS16
SOT-323

BIAS MEASURE BIAS

ADJUST

C505
10N
100V
0805

R528
220R
0W25
MF

R534
22R
0W125
0805

P546

TR514B
ZDT758
SM-8

TR513

SAP15NY
SAP

RV500
220R
LIN

TR515

SAP15PY
SAP

C508
22UF
63V
YK

0V_HF_R

DZ500
22V
BZX84C
SOT-23

Q500

OUTPUT STAGE V-I PROTECTION

R538
10K
0W125
0805

R511
1K0
0W125
0805

R554
100K
0W125
0805

R514
1K0
0W125
0805

CON501
HARWIN
M20-973

1
2

R556
330R

0W125
0805

R557
330R

0W125
0805

P549

R524
100R
0W125
0805

R529
100R
0W125
0805

R532
22R
0W125
0805

C512
100UF
25V
YK

C513
100UF
25V
YK

R535
22R
0W125
0805

R541
10K
0W125
0805

R525
100R

0W125
0805

R530
100R

0W125
0805

P529

P551

V-I PROTECTION

Q511

DZ501
22V
BZX84C
SOT-23

0V_HF_R

C509
22UF
63V
YK

D502
BAS16
SOT-323

P530

TR509
FMMT497
SOT-23

TR506
FMMT597
SOT-23

P552

D503
BAS16
SOT-323

R526
100R

0W125
0805

D506
1N4003
DO-41

D507
1N4003
DO-41

P531

P513

R536
10K
0W125
0805

R542
4K7
0W125
0805

P532

TR510
FMMT497
SOT-23

0V_HF_R

0V_HF_R

TR503
FMMT597
SOT-23

P514

R501
10K
0W125
0805

R544
10K
0W125
0805

R559
5R6
2W
CF

ZOBEL NETWORK

C527
100N
100V
MKS2

VI PROTECT
SIGNAL TO MICRO

C526
10UF
50V
YK

OUT_R

C521

100N
50V
0805

0V_LS_R

DZ506
BZX84C
3V9
SOT-23

+45V_R

ANNOTATION

VIPROT_R

OUTPUT_R

0V_LS_R

0V_HF_R

-45V_R

ITEM500 1 Con Jumper Socket 0.1IN Gold Blue8K004

* - Default jumper setting on pins 2 & 3; fit jumper
on pins 1 & 2 to increase bias voltage;
remove jumper to decrease bias voltage

DRAWING TITLE

23425

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9PB

A80/P80 - Power Amp Right

Filename:

L943C5_5.1.SCH

Notes:

A80

Contact Engineer:

Contact Tel: [phone]Mark Tweedale

03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1
03_E230 MJT 04 Aug 03 None to this sheet. Display snapoff fixing holes reduced to 3.2mm 5.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03

INITIALS
Printed:

DATE

9-Sep-2003

58Sheet of

DRAWING NO.

L943C5

ECO No. DESCRI PT I O N O F CHANGE

ISSUE

MOUNTED

UNDER IR EYE

LED806
SM

RED
SML-010

P801

+4.8V(D)_DISP

R803
10K
0W125
0805

TR801
BC849B
SOT-23

RX800

+5V

GND

PIC-26043TM2

0V(D)_DISP

O/P

0V(D)_DISP

C802
100N
50V
0805

R800
10K

0W125
0805

P802

R801
10K
0W125
0805

R856 330R
0W125 0805

P803

R802
10K
0W125
0805

TR800
BC849B
SOT-23

VFD LOCATORS

R807 0R0

R808 0R0
0W125 0805

0W125 0805

R851

C801

Q874
Q875

10UF
50V
SM

R840
47K
0W125
0805

-25V(FL)_A80

0V(D)_DISP

0V(D)_DISP0V(D)_DISP

DISP800 ITRON AH1016A

F1Pm4Pn5Pj6Pe7Pg8Pf9Pl10PAp11G1012G913G814G715G616G517G418G319G220G121Pa22Pi23Pk24Pb25Ph26Pc27PCOM28Pd29PDp30F

Q822

Q821

Q823

Q824

Q825

Q826

Q827

Q828

Q829

Q831

Q832

Q833

42

44

P23/D15/S1243P22/D14/S13

D312D213D114D015VPP16NC17VDD18OSC119OSC220VSS21NCS

-25V(FL)_A80

P800

0V(D)_DISP

R835
330R
0W125
0805

LED804
5mm
GRN
LED 5mm

C817
100N
50V
0805

C816
100N
50V
0805

0V(D)_DISP 0V(D)_DISP

R841
47K
0W125
0805

R836
330R
0W125
0805

LED805
5mm
GRN
LED 5mm

1

P21/D13/S14

2

P20/D12/S15

3

P03/D11

4

P02/D10

5

P01/D9

6

P00/D8

7

D7

8

D6

9

D5

10

D4

11

NC

+4.8V(D)_DISP

10K
0W125
0805

P804

Q834

Q835

Q836

Q837

Q838

Q839

Q840

Q841

40

38

S334S435S536S637S7

P10/S839P11/S9

P12/S1041P13/S11

22

0V(D)_DISP

X800

4.00MHz

3

2

SIL-3

0V(D)_DISP

R834
330R
0W125
0805

LED803
5mm
GRN
LED 5mm

PROCESSOR_LEDSP2_LEDSP1_LED

A80 ITEMS

Q802

R852
10K
0W125
0805

Q842

Q843

Q844

Q845

IC800

P34/K4
P33/K3
P32/K2
P31/K1
P30/K0

SDO

SDI

SCK

PT6351
LQFP-44

1

(Fitted on A80 only)

R825
330R

0W125
0805

DZ800
BZX84C
22V
SOT-23

Q876

DZ801
BZX84C
5V6
SOT-23

Q877

TR806 FMMT597

SOT-23

32

Q846

Q847

33

S2

32

S1

31

S0

30
29
28
27
26
25
24
23

Q881

Q873

+4.8V(D)_DISP

C807
100N
50V
0805

Q858
Q859
Q860

Q861

0V(D)_DISP

R855
1K0

0805
0W125

C812
10UF
50V
SM

-25V(FL)_A80

CHAS_DISPCHAS_DISP

0V(D)_DISP

R809
0R0

0W125
0805

C808
100N
50V
0805

Q862

P805

D801
BAS16
SOT-323

C813
10UF
50V
SM

R842
47K
0W125
0805

Q863

C800

C803

10UF

100N

50V

50V

SM

0805

C805
100N
50V
0805

0V(D)_DISP

SW800

1

3

R830 330R
0W125 0805
R831 330R
0W125 0805

Q864

D802
BAS16
SOT-323

A

C

EC16B242040A

D800
BAS16
SOT-323

2

B

R843
47K
0W125
0805

R844
47K
0W125
0805

TUNER

SW801

1

2

ENTER SELECT PHONO CD

SW804

SW806

1

2

1

SP1 SP2 AV

SW805

SW807

1

2

1

-38V_VFD

CATHODE BIAS

C835
10UF
50V
SM

+4.8V(D)_DISP

R804
10K
0W125
0805

R845
47K
0W125
0805

R846
47K
0W125
0805

SW808

2

1

SW809

2

1

R814
0R0
0W125
0805

LED802
3mm
GRN
LED 3mm

R823
0R0
0W125
0805

DRAWING NO.

ANNOTATION

R815
0R0
0W125
0805

0V(D)_DISP

R824
0R0
0W125
0805

R816
0R0
0W125
0805

L943C8

ISSUE

COMMON ITEMS

Q818

Q819

+4.8V(D)_DISP

*RESET_DISP

+4.8V(D) / 0V(D)

+4.8V(D)_DISP

0V(D)_DISP

+4.8V(D)_DISP

VCC

GND

0V(D)_DISP

0V(D)_DISP

(Fitted on both A80 & P80)

C830
10N
100V
0805

C837
47P
100V
0805

CHAS_DISP

+4.8V(D)_DISP

C832
100UF

6.3V
SM

0V(D)_DISP

R838
220R
0W25
MF

LED800
3mm
BICOL
LED 3mm

POWER-ON RESET

IC801

RST

Q872

LM809M3-3.08
SOT-23

1

Q887

C820
100N
50V
0805

DRAWING TITLE

ARCAM

A & R Cambridge Ltd.
Pembroke Avenue
Waterbeach
Cambridge CB5 9QR

NOTE:
All resistor / small capacitor
combinations are placed near
flexfoil connector for EMC filtering

C831
10N
100V
0805

C838
47P
100V
0805

C833
100UF

6.3V
SM

TR803
MMUN2111LT1
SOT-23

R839
220R
0W25
MF

POWER LEDs

MASTER

R806
1K0

0W125
0805

FIX804
Dia 3.2mm

1

0V(D)_DISP

C826
1N0
100V
0805

C811
100N
50V
0805

Q853

*PWR_LED_GRN_DISP

C810
100N
50V
0805

C815
100N
50V
0805

CHAS_DISP

FIX805
Dia 3.2mm

Q888

C821
100N
50V
0805

C827
1N0
100V
0805

*RESET_DISP

0V(D)_DISP

CHAS_DISP

1

Q889

C822
100N
50V
0805

C828
1N0
100V
0805

A80 & P80 Display Circuitry

Filename:

L943C8_5.1.SCH

Notes:

A80

Contact Engineer:

FIX800
Dia 3.2mm

FIX808
Dia 3.2mm

FIX807
Dia 3.2mm

VFD_SDATA / *SP1_LED DISP
PHASE_A / *SP2_LED DISP

FIX806
Dia 3.2mm

Contact Tel: [phone]Mark Tweedale

1

0V(D)_DISP

1

0V(D)_DISP

1

0V(D)_DISP

CHAS_DISP

1

Q890

0V(D)_DISP

CHAS_DISP

Q820

C806
100N
50V
0805

CHAS_DISP

Q892

C834
100N
50V
0805

CHAS_DISP

Q891

C824
100N
50V
0805

C823
100N
50V
0805

0V(D)_DISP

R818
0R0

0W125
0805

R819
0R0

0W125
0805

03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1
03_E230 MJT 04 Aug 03 Display snapoff fixing holes reduced to 3.2mm 5.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03

INITIALS

ECO No. DESCRI PT I O N O F CHANGE

Printed:

TO MAIN PCB - SHEET6

CON800 MOLEX 52044

REMOTE_DISP

R810
0R0

0W125
0805

R853

R854

100R

100R

0W125

0W125

0805

0805

C836
10UF
50V
SM

R805
10K
0W125
0805

R826 330R
0W125 0805

R847
47K
0W125
0805

SW810

2

1

2

TAPE

SW811

2

1

2

PHASE_A / *SP2_LED DISP
PHASE_B / *SP2_SW DISP

VFD_SDO / *SP1_SW DISP
VFD_SDATA / *SP1_LED DISP
VFD_SCLK / *PWR_BTN DISP
VFD_CS / 0V(D)

R849
47K
0W125

0805
R848
47K
0W125
0805

-25V(FL)_A80

R821
0R0
0W125
0805

CHAS_DISP

R817
0R0
0W125
0805

CHAS_DISP

0V(D)_DISP

+4.8V(D) / 0V(D)

FIL1 / 0V(D)
FIL2 / 0V(D)

C829
1N0
100V
0805

C825
1N0
100V
0805

C804
100N
50V
0805

123456789

Q803

Q804

Q805

0V(D)_DISP

PHASE_A / *SP2_LED DISP

*PWR_LED_RED_DISP

A80:AUX A80:DVD
P80:SP1 P80:SP2

SW802

1

2

FIX801
Dia 3.2mm

SW803

1

1

0V(D)_DISP

10111213141516171819202122

Q806

Q807

Q808

Q809

Q810

330R

330R

R828

R827

0W125 0805

0W125 0805

VFD_SDO / *SP1_SW DISP

PHASE_B / *SP2_SW DISP

VFD_SDATA / *SP1_LED DISP

FIL2 / 0V(D)

FIL1 / 0V(D)

POWER

SW812
SDTX-644

1

2

FIX802
Dia 3.2mm

Q885

C818
100N
50V
0805

Q811

Q812

Q813

Q814

Q815

Q816

Q817

330R

R829

0W125 0805

*PWR_LED_GRN_DISP

*PWR_LED_RED_DISP

VFD_CS / 0V(D)

VFD_SCLK / *PWR_BTN DISP

TR802
MMUN2111LT1
SOT-23

R837
220R

C809

0W25

100N

MF

50V
0805

CHAS_DISP CHAS_DISP

RED GRN

C814
100N
50V
0805

2

FIX803
Dia 3.2mm

1

Q886

C819
100N
50V
0805

0V(D)_DISP

P80 ITEMS

(Fitted on P80 only)

R813

R812

R811
0R0
0W125
0805

Q855 Q856

R832
330R
0W125
0805

SP1_LED SP2_LED

R820
0R0

0W125
0805

DATE

9-Sep-2003

0R0

0R0

0W125

0W125

0805

0805

(used to
tie down
track at
display side)

+4.8V(D)_DISP

TR804
MMUN2111LT1
SOT-23

LED801
3mm
GRN
LED 3mm

VFD_SDO / *SP1_SW DISP

PHASE_B / *SP2_SW DISP

VFD_SCLK / *PWR_BTN DISP

88Sheet of

R850
0R0
0W125
0805

0V(D)_DISP0V(D)_DISP

R822
0R0
0W125
0805

TR805
MMUN2111LT1
SOT-23

R833
330R
0W125
0805

A2