AudioLab 8000S Schematic

service manual

Integrated amplifier 8000S

index

1.0 safety and servicing notes

1.1 Safety precautions ....................................................................................1

1.2 Electrostatic discharge precautions .............................................................1

1.3 Soldering.................................................................................................1

2.0 front and rear panel layouts

2.1 Front panel controls ..................................................................................3

2.2 Rear panel connections .............................................................................3

3.0 disassembly instructionsPages 4 and 5 DELETED

4.0 functional tests

4.1 Test equipment required ............................................................................6

4.2 Functional test procedure...........................................................................7

5.0 performance tests

5.1 Test equipment required ..........................................................................11

5.2 Performance test procedure .....................................................................12

6.0 test points

6.1 Functional and performance test points .....................................................16

7.0 circuit schematics

7.1 Master schematic diagram (SCH267M-01-05)...........................................17

7.2 Line amplifier left channel schematic (SCH26701-07-02) ............................18

7.3 Line amplifier right channel schematic (SCH26701-08-02)..........................19

7.4 Power amplifier left channel schematic (SCH26701-09-02).........................20

7.5 Power amplifier right channel schematic (SCH26701-10-02).......................21

7.6 Power supplies schematic (SCH26701-01-02) ...........................................22

7.7 Protect and turn on schematic (SCH26701-06-02) .....................................23

7.8 Digital system controller schematic (SCH26701-02-01)...............................24

7.9 Digital system interface schematic (SCH26701-03-01)................................25

7.10 Input interface schematic (SCH26701-04-04) ............................................26

7.11 Relay coils schematic (SCH26701-05-01) .................................................27

7.12 Front panel schematic (SCH26702-01-01) ................................................28

7.13 Speaker outputs schematic (SCH26703-01-01)..........................................29

8.0 printed circuit board layout

8.1 Printed circuit board layout (top view).......................................................30

8.2 Printed circuit board layout (bottom view)..................................................31

9.0 technical data

9.1 8000S Technical specifications................................................................32

9.2 International standards............................................................................34

1.0 safety and servicing notes

1.1 Safety precautions

1. This unit is Class II, which means that it is not connected to the protective earth system.
All live voltages are insulated from the case by double insulation.

2. Do not attempt to service unless qualified to do so.

3. Disconnect unit from AC power supply before removing cover.

4. Components marked with the symbol on the circuit schematic are safety critical
and must only be replaced with an identical component, or an alternative approved by
the manufacturer.

5. Switch unit off, and disconnect from supply before making and breaking any
connections.

6. Do not adjust any controls unless instructed to do so in this manual.

1.2 Electrostatic discharge precautions

Electrostatic discharge (ESD) is due to charges produced by insulating materials rubbing together.
Humans collect electrostatic charge through normal activities when clothes rub together and when
walking on carpet. This charge may be discharged suddenly when you touch a conductor. If the
conductor is connected to a sensitive electronic circuit, you may damage the components. It is also
possible to reduce the life of components without causing any obvious damage.

To prevent ESD damage, it is necessary to follow these guidelines.

1. Prepare work area. Place an ESD protective mat on the bench, strapped to the
protective earth circuit.

2. Prepare yourself. Put on an ESD protective wrist band, strapped to the protective earth
circuit, or to the ESD protective mat.

3. Keep all PCBs removed from unit in ESD protective bags.

4. Keep all replacement electronic components, PCBs and stock items in ESD protective
bags or boxes.

5. Be particularly careful with components marked with the following symbol:

1.3 Soldering

How to de-solder components

Components should be removed, wherever possible, using a de-soldering tool. Be careful not to
damage tracks and pads by applying too much pressure.

How to make good solder joints

1. Ensure surfaces are clean.

2. Keep soldering iron clean and wetted with solder. Use an appropriate bit. Do not leave
soldering iron on when not in use.

1

1.0 safety and servicing notes

3. Apply soldering iron to both component lead and pad
before applying solder. Make sure that the soldering
iron is applied long enough for the solder to wet
properly, but do not apply for too long or component
damage may occur.

4. Allow a small gap between component body and
pad. Solder must not reach the base of the
component.

How to detect acceptable joints

1. Solder joints should have from a shiny to satin lustre
and a generally smooth appearance.

2. Solder should have wetted both the component lead
and pad.

3. There should be a concave meniscus between the
objects being soldered. The angle of solder to pad
should be less than 90° unless the solder joint extends
over the edge of the pad.

4. Solder should fill the component pad and wet
component lead around the full circumference (360°).

How to detect unacceptable joints

1. Poor wetting produces a bead of solder. The fillet will
be convex instead of concave, and there will not be a
feather edge.

2. On double-sided PCBs, solder should wet all round
plated-through hole, on both sides of the PCB.

Trim Line

Cleaning up after soldering

1. Flux is very corrosive. Remove with IPA (propan-2-ol) before completing the job.

2. Remove any solder balls and splashes from the unit.

3. Check all new solder joints and ensure all PCBs are clean before replacing covers.

4. After replacing covers, clean the case and any display windows with a damp cloth. Do
not use any organic solvents. If scratched, replace display windows.

2

2.0 f r o n t a n d r e a r p a n e l l a y o u t s

2.1 Front panel controls

REMOTE
CONTROL SENSOR

RECORD
SELECTOR

2.2 Rear panel connections

INPUT

SELECTOR

MODE
SWITCH

MUTE LED

RED=Mute On

POWER LED

RED=Power On

VOLUME

CONTROL

HEADPHONE

SOCKET

POWER
SWITCH

FUSE

HOLDER

3

MAINS
INPUT

RIGHT

LEFT

LOUDSPEAKER TERMINALS

POWER

AMPLIFIER

INPUT

PRE-

AMPLIFIER

OUTPUTS

TAPE 2 TAPE 1

VCR

CDR,ETC

AUX

CD, DVD

4.0 functional tests

These notes are provided to assist you in servicing the amplifier. The circuit schematics are marked
with typical voltage levels, which may assist in defining the cause of any problem.

4.1 Test equipment required

Equipment

Digital Multimeter

Dual Tracking DC Power
Supply

Various Leads

Specification

Accuracy better than 0.5% in V and mV ranges

Output: ±32 V DC 2 A

Positive terminal of negative supply must be connected to
negative terminal of the positive supply unless internally linked

VmA VmA

-ve +ve -ve +ve

Select Tracking

Black = -ve
Red = +ve
Green = 0 V

0 V

+32 V-32 V

Figure 4.1 - Functional test set-up

6

4.0 functional tests

4.2 Functional test procedure

For test point (TP) references, see section 6.0 Test Points.

No

4.2.1.

4.2.2.

4.2.3.

4.2.4.

4.2.5.

4.2.6.

Action

Disconnect all
cables from
amplifier

Check voltage
setting

Check fuse
type

Check fuse
resistance

Set up power
supply

Remove cover

Test Equipment

Multimeter set
to Ω

Dual tracking DC
power supply

Details

Read ratings label on rear of amplifier.

Open fuse holder in power socket on rear
panel.
Rated supply Fuse Type
230 V AC T2.5A L250V
115 V AC T4A 125V
110 V AC T4A 125V

Fuse and spare fuse should be low
resistance.

Set output voltage to ±32 V, current limited
to 500 mA.

4.2.7.

4.2.8.

Connect
supplies as
shown in
Figure 4.1

Apply DC
voltage to
amplifier

Dual tracking DC
power supply

Dual tracking DC
power supply

With supplies off, connect

• positive output of supply to positive
terminal of reservoir capacitor

• negative output of supply to
negative terminal of capacitor
No connection is required to 0 V terminal
of power supply.

CAUTION:

Do not connect with wrong polarity.

Check supply outputs are ±32 V and
switch output on.
Current output should be
<300 mA negative supply and
<600 mA positive supply.
If higher, turn RV701 (TP 24) and RV801

(TP 25) fully anti-clockwise.

Continue with test procedure of current
output is 180 mA ±25 mA negative supply
and 515 mA ±25 mA positive supply.
If higher, switch off and investigate.

4.2.9.

Measure left
channel supply
rails

Multimeter set to
V DC

Measure voltage across D713 (TP 1+ and

TP 1-) and D714 (TP 2+ and TP 2-).

Voltage should be 32 V ±0.25 V.

7

4.0 functional tests

4.2 Functional test procedure

For test point (TP) references, see section 6.0 Test Points.

No

4.2.10.

4.2.11.

4.2.12.

Action

Measure right
channel supply
rails

Check
preamplifier
supply rails

Left channel
Check power
amplifier

Test Equipment

Multimeter set to
V DC

Multimeter set to
V DC

Multimeter set to
V DC

Details

Measure voltage across D813 (TP 3+ and

TP 3-) and D814 (TP 4+ and TP 4-).

Volatge should be 32 V ±0.25 V.

Connect negative probe to 0 V (TP 0).
Connect positive probe to 30 V test
point (TP 19).
Voltage should be 28 V ±3 V.
Connect positive probe to 10 V test
point (TP 15).
Voltage should be 10 V ±0.3 V.
Connect positive probe to 5 V test
point (TP 16).
Voltage should be 5 V ±0.3 V.

Measure voltage across R731 (TP 5+

and TP 5-).

Voltage should be 0.85 V ±0.1 V.
Measure voltage across R735 (TP 6+

and TP 6-).

Voltage should be 0.85 V ±0.1 V.

4.2.13.

4.2.14.

4.2.15.

4.2.16.

4.2.17.

Left channel
Measure
amplifier offset

Left channel
Measure
preamplifier

Right channel
Check power
amplifier

Right channel
Measure
amplifier offset

Right channel
Measure
preamplifier

Multimeter set to
mV DC

Multimeter set to
V DC

Multimeter set to
V DC

Multimeter set to
mV DC

Multimeter set to
V DC

Connect negative probe to 0 V (TP 0).
Connect positive probe to R749 (TP 9).
Voltage should be <5 mV.

Connect positive probe to R518 (TP 12).
Voltage should be 14 V ±1 V.

Measure voltage across R831 (TP 7+

and TP 7-).

Voltage should be 0.85 V ±0.1 V.
Measure voltage across R835 (TP 8+

and TP 8-).

Voltage should be 0.85 V ±0.1 V.

Connect negative probe to 0 V (TP 0).
Connect positive probe to R849 (TP 10).
Voltage should be <5 mV.

Connect positive probe to R618 (TP 13).
Voltage should be 14 V ±1 V.

8

4.0 functional tests

4.2 Functional test procedure

For test point (TP) references, see section 6.0 Test Points.

No

4.2.18.

4.2.19.

4.2.20.

4.2.21.

4.2.22.

4.2.23.

Action

Measure offset
of protection
circuit

Disconnect DC
power supplies

Fix any faults

Connect
amplifier to AC
power input

Measure left
channel supply
rails

Measure right
channel supply
rails

Test Equipment

Multimeter set to
mV DC

Multimeter set to
V DC

Multimeter set to
V DC

Details

Connect positive probe to cathode of D943

(TP 11).

Voltage should be <5 mV.

If any faults have been detected, repair and
return to the beginning of this test
procedure.

Measure volatge across D713 (TP 1+ and

TP 1-) and D714 (TP 2+ and TP 2-).

Volatge should be 44 V ± 2.5 V.

Measure volatge across D813 (TP 3+ and

TP 3-) and D814 (TP 4+ and TP 4-).

Volatge should be 44 V ± 2.5 V.

4.2.24.

4.2.25.

4.2.26.

Check
operation of
mute relay

Check
preamplifier
supply rails

Left channel
Check power
amplifier

Multimeter set to
V DC

Multimeter set to
V DC

Multimeter set to
V DC

Connect negative probe to 0 V (TP 0).
Connect positive probe to cathode of D951

(TP 23).

Switch on AC power button.
Voltage should increase slowly from 0 to
12 V then relay should operate and voltage
should increase to 41 V ±2 V.

Connect negative probe to 0 V (TP 0).
Connect positive probe to 30 V test point

(TP 19). Voltage should be 28 V ±3 V.

Connect positive probe to 10 V test point

(TP 15).

Voltage should be 10 V ±0.5 V.
Connect positive probe to 5 V test point

(TP 16).

Voltage should be 5 V ±0.3 V.

Measure voltage across R731

(TP 5+ and TP 5-).

Voltage should be 0.85 V ±0.1 V.
Measure voltage across R735

(TP 6+ and TP 6-).

Voltage should be 0.85 V ±0.1 V.

9

4.0 functional tests

4.2 Functional test procedure

For test point (TP) references, see section 6.0 Test Points.

No

4.2.27.

4.2.28.

4.2.29.

4.2.30.

4.2.31.

Action

Left channel
Measure
amplifier offset

Left channel
Measure
preamplifier

Right channel
Check power
amplifier

Right channel
Measure
amplifier offset

Right channel
Measure
preamplifier

Test Equipment

Multimeter set to
mV DC

Multimeter set to
V DC

Multimeter set to
V DC

Multimeter set to
V DC

Multimeter set to
V DC

Details

Connect negative probe to 0 V (TP 0).
Connect positive probe to R749 (TP 9).
Voltage should be <5 mV.

Connect positive probe to R518 (TP 12).
Voltage should be 14 V ±1 V.

Measure voltage across R831 (TP 7+ and

TP 7-)

Voltage should be 0.85 V ±0.1 V.
Measure voltage across R835 (TP 8+ and

TP 8-)

Voltage should be 0.85 V ±0.1 V.

Connect negative probe to 0 V (TP 0).
Connect positive probe to R849 (TP 10).
Voltage should be <5 mV.

Connect positive probe to R618 (TP 13).
Voltage should be 14 V ±1 V.

4.2.32.

4.2.33.

4.2.34.

4.2.35.

4.2.36.

4.2.37.

Measure offset
of protection
circuit

Fix any faults

Allow amplifier
to warm up

Left channel
Check bias

Right channel
Check bias

Readjust bias

Multimeter set to
mV DC

Multimeter set to
V DC

Multimeter set to
V DC

Connect positive probe to cathode of D943

(TP 11).

Voltage should be <5 mV.

If any faults have been detected, repair and
return to the beginning of this test
procedure .

Leave on for 20 minutes with cover on. It is
not necessary to screw cover down.

Connect probes across legs of R748

(TP 1- and TP 2-).

Voltage should be 22 mV ±0.5 mV.
If necessary, adjust RV701 (TP 24).

Connect multimeter probes across legs of
R848 (TP 3- and TP 4-).
Voltage should be 22 mV ±0.5 mV.
If necessary, adjust RV801 (TP 25).

Leave on for a further 10 minutes.
Repeat 4.2.35 and 4.2.36.

10

5.0 performance tests

5.1. Test equipment required

Equipment

True RMS multimeter

Audio analyser

Oscilloscope

Output loads

Shorted phono plugs

Various leads

Output Input

Specification

Accuracy better than 0.5% in V and mV ranges

Able to measure

• distortion to 0.001% with 200Hz high pass filter

• signal to noise ratio greater than 95 dB with IHF
A-weighted filter

20 MHz, dual channel
8 Ω (125 W) and short circuit

2 off

OscilloscopeAudio analyser

Ch 1 Ch 2

+ ±

8 Ω Load

AC Power Input

CD I/P

Scope Probe

Figure 5.1 Performance test set-up. Connections for left channel shown, repeat connections for right channel.

11

5.0 performance tests

5.2 Performance test procedure

For test point (TP) references, see section 6.0 Test Points.

No

5.2.1.

5.2.2.

5.2.3.

5.2.4.

5.2.5.

Action

Switch off AC
power button

Connect
amplifier as
shown in
Figure 5.1

Switch on AC
power button

Adjust volume
knob to
maximum

Measure output
of preamplifier

Test Equipment

Audio Analyser
output connected to
both left and right
CD inputs
8 Ω load

Audio Analyser
output: 1kHz,
100 mV rms
Multimeter set to
mV AC

Details

Output frequency: 1 kHz sine wave
Output voltage: 100 mV rms
Reading settings: AC level, Auto,

200 Hz HP filter on
A-weighted filter off

Select cd using INPUT selector knob.
Select pre using MODE selector knob.

Measure output of left and right PRE
AMP sockets.
Voltage should be 286 mV rms
±10 mV rms.

5.2.6.

5.2.7.

5.2.8.

5.2.9.

Measure output
of power
amplifier

Reduce

VOLUME

knob to
minimum

Set OUTPUT
to 20 V rms

Measure
distortion at
1 kHz

Audio Analyser
output: 1kHz,
100 mV rms
200Hz HP filter on
A-weighted filter off

Audio Analyser
output: 1kHz,
1 V rms
200Hz HP filter on
A-weighted filter off

Audio Analyser
output 1kHz,
1 V rms
200Hz HP filter on
A-weighted filter off

Select integrated using MODE selector
knob.
Measure output of left and right
loudspeaker terminals.
Voltage should be 8 V rms ±0.2 V rms.

Increase volume until amplifier OUTPUT
is 20 V rms. If signal is increased further,
amplifier will begin to clip.

Distortion of left and right channels should
be <0.006%

12

5.0 performance tests

5.2 Performance test procedure

For test point (TP) references, see section 6.0 Test Points.

No

5.2.10.

5.2.11.

Action

Set up
amplifier for
1 W output

Measure signal
to noise ratio
(SNR)

Test Equipment

Audio Analyser
output: 1kHz,
500 mV

Audio Analyser
200Hz HP filter off
A-weighted filter on

Details

Adjust VOLUME knob until voltage on
output of amplifier is

2.83 V rms (or 1 W). If possible, set this
as 0 dB reference.

Remove input leads and replace with
shorted phono plugs.
Measure dB reading (if function is
available), which is equivalent to signal­to-noise ratio.
Alternatively measure noise voltage and
calculate SNR.
SNR should be >80 dB.

SNR = 10 log10signal power

noise power

SNR = 20 log10signal voltage

noise voltage

5.2.12.

5.2.13.

5.2.14.

Measure
distortion at
20 kHz

Measure
distortion at
100 Hz

Left channel
check
operation of
protection
circuit

Audio Analyser
output: 20kHz, 1 V,
200Hz HP filter on
A-weighted filter off

Audio Analyser
output: 100Hz, 1V
200Hz filter off
A-weighted filter off

Audio Analyser
output:
1 kHz, 100 mV
Oscilloscope
ch1: 0.5 V/div

0.2 Vms/div

ch2: 0.2 V/div

0.2 ms/div

trigger: ch1

Adjust the VOLUME knob to give
20 V rms at loudspeaker output.
Distortion should be <0.07% for left and
right channels.

Distortion should be <0.007% for left and
right channels.

Turn VOLUME knob to minimum.
Connect ground clip of oscilloscope
probe to 0 V (TP 0).
Connect probe for channel 2 to cathode
of D943 (TP 11).
Short circuit loudspeaker terminal.
Slowly increase VOLUME. Check
oscilloscope traces with Figure 5.2.
Trace will appear briefly and will
disappear when amplifier mutes.

13

5.0 performance tests

5.2 Performance test procedure

For test point (TP) references, see section 6.0 Test Points.

No

5.2.15.

5.2.16.

Action

Right channel
check
operation of
protection
circuit

Left channel
check mute
operation

Test Equipment

Audio Analyser
output voltage: 100
mV
Output frequency: 1
kHz
Oscilloscope
ch1: 0.5 V/div

0.2 ms/div

ch2: 0.2 V/div

0.2 ms/div

trigger: ch1

Multimeter set to
diode test

Details

Turn VOLUME knob to minimum.
Leave probe on cathode of D943 (TP11).
Short circuit loudspeaker terminal.
Slowly increase VOLUME. Check
oscilloscope traces with Figure 5.2.
Trace will appear briefly and will
disappear when amplifier mutes.

Disconnect input signal and loudspeaker
leads.
Turn VOLUME knob to 12 o’clock.
Connect negative probe to 0 V (TP 0).
Connect positive probe to input socket
signal pin (TP 21).
Make sure amplifier mutes.
Disconnect positive probe.
Make sure mute relay resets (not muted).
Relay will click.

5.2.17.

5.2.18.

Left channel
check mute
operation
reverse polarity

Right channel
check mute
operation

Multimeter set to
diode test

Multimeter set to
diode test

Connect positive probe to 0 V (TP 0).
Connect negative probe to input socket
signal pin (TP 21).
Make sure amplifier mutes.
Disconnect positive probe.
Make sure mute relay resets (not muted).
Relay will click.

Connect negative probe to 0 V (TP 0).
Connect positive probe to input socket
signal pin (TP 22).
Make sure amplifier mutes.
Disconnect positive probe.
Make sure mute relay resets (not muted).
Relay will click.

14

5.0 performance tests

5.2 Performance test procedure

For test point (TP) references, see section 6.0 Test Points.

No

5.2.19.

5.2.20.

5.2.21.

5.2.22.

Action

Right channel
check mute
operation
reverse polarity

Reassemble unit

Noise check

Check
operation of
remote
controller

Test Equipment

Multimeter set to
diode test

Connect to CD
player and
preamplifier and
play a TAG
McLaren Audio Test
Tracks CD

Details

Connect positive probe to 0 V (TP 0).
Connect negative probe to input socket
signal pin (TP 22).
Make sure amplifier mutes.
Disconnect positive probe.
Make sure mute relay resets (not muted).
Relay will click.

Remove all leads

Reconnect loudspeaker connections and
listen to audio output for good audio
performance.

Check remote funtions:
volume
input selection
muting

5.2.23.

Clean with
damp cloth

1

.2 ms/div
400 mV/div

2

.2 ms/div

2.00 V/div

1

2

Figure 5.2 Protection circuit waveforms

15

6.0 test points

6.1 Functional and performance test points

TP 22 TP 21

TP 15

TP 16

TP 19

TP 11

TP 12TP 13

TP 1+

TP 1-

TP 24

TP 5+ TP 5-

TP 2+

TP 2-

TP 9

TP 4+

TP 8+ TP 8-TP 6- TP 6+

TP 10

TP 25

TP 4-

TP 7-

TP 3+

TP 3-

TP 0

TP 7+

TP 0

TP 0

TP 23

16

7.0 circuit schematics

7.1.1 Master schematic diagram (SCH267M-01-05)

TP 21

TP 22

SCH26701-03-01

PAGE 25

SCH26701-04-04

PAGE 26

SCH26702-01-01

PAGE 28

SCH26701-07-02

SCH26701-08-02

PAGE 18

PAGE 19

SCH26701-05-01

PAGE 27

SCH26701-02-01

PAGE 24

SCH26701-09-02

PAGE 20

SCH26701-10-02

PAGE 21

SCH26703-01-01

PAGE 29

17.2

SCH26701-01-02

PAGE 22

SCH26701-06-02

PAGE 23

7.0 circuit schematics

7.2.1 Line amplifier left channel schematic (SCH26701-07-02)

0V

14.4V

14.0V

4.1V

4.7V

14.6V

28.8V 28.8V

0.4V 0.4V

1.0V

29.0V

0.0V

28.8V

28.2V

28.8V

28.2V

30.0V

TP 12

All DC voltages are relative to 0 V.
Measurements should be made with no connections to
amplifier except AC power.
Use high input impedance voltmeter (>20 kΩ/V).
Meter must be “floating” relative to ground.

18.1

7.0 circuit schematics

7.3.1 Line amplifier right channel schematic (SCH26701-08-02)

0.0V

0.0V

14.4V

28.2V

14.0V

4.7V

0.4V 0.4V

1.0V

28.8V

30.0V

28.8V

29.0V

4.1V

28.8V

28.2V

14.6V

28.8V

TP 13

All DC voltages are relative to 0 V.
Measurements should be made with no connections to
amplifier except AC power.
Use high input impedance voltmeter (>20 kΩ/V).
Meter must be “floating” relative to ground.

19.1

7.0 circuit schematics

7.4.1 Power amplifier left channel schematic (SCH26701-09-02)

12.0V

11.5V 11.5V

10.9V

10.3V

10.3V

11.1V

10.9V

12.0V

42.4V

43.0V

TP 5+

TP 5-

TP 24

44.0V

TP 1+

41.8V

TP 1-

TP 9

0.4V 0.4V

0.0V

-12.0V

All DC voltages are relative to 0 V.
Measurements should be made with no connections to
amplifier except AC power.
Use high input impedance voltmeter (>20 kΩ/V).
Meter must be “floating” relative to ground.

-0.5V

-8.0V

0.0 V

-11.6V

TP 2+

-11.6V

-12.0V

-42.4V

TP 2-

-43.0V

TP 6+

-44.0V

TP 6-

20.1

7.0 circuit schematics

7.5.1 Power amplifier right channel schematic (SCH26701-10-02)

11.5V 11.5V

10.9V

10.3V

10.3V

11.1V

10.9V

12.0V

42.4V

43.0V

TP 7+

TP 7-

TP 25

44.0V

TP 3+

41.8V

TP 3-

TP 10

0.4V 0.4V

0.0V

All DC voltages are relative to 0 V.
Measurements should be made with no connections to
amplifier except AC power.
Use high input impedance voltmeter (>20 kΩ/V).
Meter must be “floating” relative to ground.

-0.5V

-8.0V

0.0 V

-11.6V

-11.6V

-12.0V

TP 4+

-41.8V

-42.4V

TP 4-

-43.0V

TP 8+

-44.0V

TP 8-

21.1

7.0 circuit schematics

7.6.1 Power supplies schematic (SCH26701-01-02)

44.0V

TP 18

TP 0

6.2V

6.8V

28.8V

6.2V

30.0V

TP 17

30.0V

TP 15

10.0V

TP 16

5.0V

0.0V

All DC voltages are relative to 0 V.
Measurements should be made with no
connections to amplifier except AC
power.
Use high input impedance voltmeter
(>20 kΩ/V).
Meter must be “floating” relative to
ground.

22.1

TP 19

30.0V

6.8V

6.2V

0.0V

7.0 circuit schematics

7.7.1 Protect and turn on schematic (SCH26701-06-02)

44.0V 44.0V

-44.0V

0.0V

44.0V

0.0V

0.0V

TP 11

0.0V

44.0V

TP 23

-44.0V-44.0V

-18.0V

0.0V

0.0V

0.0V

ZTX653

0.0V

22.2V

ZTX753

44.0V

12.0V

44.0V

28.1V

44.0V

0.0V

0.0V

-44.0V -44.0V

0.0V

44.0V

All DC voltages are relative to 0 V.
Measurements should be made with no connections to
amplifier except AC power.
Use high input impedance voltmeter (>20 kΩ/V).
Meter must be “floating” relative to ground.

0.0V

0.0V0.0V

23.1

7.0 circuit schematics

7.8 Digital system controller schematic (SCH26701-02-01)

24

7.0 circuit schematics

7.9 Digital system interface schematic (SCH26701-03-01)

25

7.0 circuit schematics

7.10.1 Input interface schematic (SCH26701-04-04)

26.1

BZV86-2V0

7.0 circuit schematics

7.11 Relay coils schematic (SCH26701-05-01)

27

7.0 circuit schematics

7.12 Front panel schematic (SCH26702-01-01)

28

7.0 circuit schematics

7.13 Speaker outputs schematic (SCH26703-01-01)

29

8.0 printed circuit board layout

8.1 Printed circuit board layout (top view)

digital system

interface

power amplifier

left channel

power amplifier

right channel

digital
system
controller

power
supply

power
supply

digital
system
controller

30

protect 
& turn
on delay

power supplyinput interface

8.0 printed circuit board layout

8.2 Printed circuit board layout (bottom view)

power amplifier

right channel

power amplifier

left channel

digital system

interface

power
supply

power
supply

digital
system
controller

protect 
& turn
on delay

31

digital
system
controller

power supply input interface

9.0 technical data

9.1 8000S Technical specifications

rated output power

(both channels driven)

typical output power

(both channels driven)

preamplifier input

impedance

preamplifier input level

preamplifier gain

preamplifier signal

to noise

preamplifier output

impedance

60 W per channel into rated load impedance (8 Ω)
95 W into 4 Ω and 130 W into 2 Ω for short periods

72 W per channel into rated load impedance (8 Ω)
115 W into 4 Ω and 150 W into 2 Ω for short periods

20 kΩ nominal

175 mV rms (relative to 0.5 V rms preamplifier output)

9 dB at 1 kHz

greater than 80 dB
(relative to 0.5 V rms preamplifier output)

100 Ω nominal

preamplifier maximum

output

record output impedance

record output gain

power amplifier

input impedance

power amplifier

input level

power amplifier gain

power amplifier

signal to noise

frequency response

(-3dB)

greater than 7.76 V rms

1 kΩ nominal

0 dB (i.e. the record output level is the same as the input level)

47 kΩ nominal

782 mV rms (for full rated output)

29.0 dB at 1 kHz

greater than 80 dB (relative to 0 dBW)

1 Hz – 65 kHz

32

9.0 technical data

9.1 8000S Technical specifications

frequency response

(20 Hz – 20 kHz)

total harmonic

distortion + noise

channel seperation

crosstalk rejection

polarity (phase)

headphone output

impedance

operating temperature

range

ac supply frequency

± 0.5 dB

less than 0.07%

greater than 60 dB at 1 kHz

greater than 80 dB at 1 kHz

non-inverting for all inputs and outputs

330 Ω (suitable for headphones of 8 Ω – 2 kΩ impedance)

10 – 35 ˚C

50 – 60 Hz

ac supply

voltage

power consumption

dimensions

(including feet,

terminals and controls)

The rated and typical performance applies when the mains supply voltage is either 230 V AC for 220 - 240 V units or
115 V AC for 110 - 120 V units

We reserve the right to alter design and specification without notice
Specification may vary for different countries

110 – 120 V or 220 – 240 V
The voltage is marked on the rear of the unit

less than 300 W

445 mm wide
75 mm high
350 mm deep

33

9.0 technical data

9.2 International standards

The 8000S meets or exceeds all the legal requirements listed below:

directives

safety

emc emissions

emc immunity

89/336/EEC EMC Directive (as amended by 93/23/EEC)

* 73/23/EEC Low Voltage Directive (as amended by 93/23/EEC)

* IEC65: 1985
* IEC65 A2: 1989
* IEC65 A3: 1992
* EN60065: 1993

EN50081 -1: 1992
EN55022 Class B: 1994
EN60555 -2: 1987
EN61000 -3-2: 1995
EN61000 -3-3: 1995
FCC Part 15 Class B: 1997

EN50082 -1: 1992
IEC801 -2: 1991 ± 8 kV air discharge
IEC801 -3: 1984 3 V/m
IEC801 -4: 1988 ± 1 kV AC power, ± 500 V other ports
EN61000 -4-2: 1995 ± 8 kV air, ± 4 kV contact discharge
EN61000 -4-4: 1995 ± 1 kV AC power, ± 500 V other ports
EN61000 -4-5: 1995 ± 2 kV common mode, ± 1 kV

differential mode

EN61000 -4-11:1994

* 115 V units are fitted with 4 mm terminals. They comply with 73/23/EEC, IEC65 and

EN60065 in all other aspects

34

IAG Service Centre
Unit 4, St Margaret’s Way
Stukeley Meadows Industrial Estate
Huntingdon
Cambs PE29 6EB
England

ephone 452561

Tel :[phone]

13403

Fax: [phone]

www.audiolab.co.uk