Functional Test Procedure - Audiolab 8000S Service Manual

4.0 f u n c t i o n a l t e s t s
4.2

Functional test procedure

For test point (TP) references, see section 6.0 Test Points.
No Action
4.2.1. Disconnect all
cables from
amplifier
4.2.2. Check voltage
setting
4.2.3. Check fuse
type
4.2.4. Check fuse
resistance
4.2.5. Set up power
supply
4.2.6. Remove cover
4.2.7. Connect
supplies as
shown in
Figure 4.1
4.2.8. Apply DC
voltage to
amplifier
4.2.9. Measure left
channel supply
rails
Test Equipment Details
Read ratings label on rear of amplifier.
Open fuse holder in power socket on rear
panel.
Rated supply
230 V AC
115 V AC
110 V AC
Multimeter set Fuse and spare fuse should be low
to Ω
resistance.
Dual tracking DC Set output voltage to ±32 V, current limited
power supply to 500 mA.
Dual tracking DC With supplies off, connect
power supply •
terminal of reservoir capacitor
•
negative terminal of capacitor
No connection is required to 0 V terminal
of power supply.
CAUTION:
Do not connect with wrong polarity.
Dual tracking DC Check supply outputs are ±32 V and
power supply switch output on.
Current output should be
<300 mA negative supply and
<600 mA positive supply.
If higher, turn RV701
(TP 25)
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.
Multimeter set to Measure voltage across D713
V DC TP 1-)
Voltage should be 32 V ±0.25 V.
Fuse Type
T2.5A L250V
T4A 125V
T4A 125V
positive output of supply to positive
negative output of supply to
(TP 24) and RV801
fully anti-clockwise.
(TP 1+ and
and D714 (TP 2+ and TP 2-).
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