Fault Diagnostics; Power Supply Test Points; Hints And Tips - Arcam DIVA A65 Service Manual

Fault diagnostics

Fault
No power
Stuck in protection
Intermittent audio on one channel
Fails to respond to commands
Volume control rubs on front panel
Audio crackles on o/p

Power supply test points

Position
LK125
LK126
LK271 or black speaker terminal
LK303
LK301
Q300 emitter
Q304 emitter
Q302 emitter
Q305 emitter
D910 emitter
IQ settings
Model
A65
A75
P75
A85
P85
A65 plus
A75 plus
P75 plus
!
To isolate a fault between pre and power stage remove C602 (left channel) or C702 (right
channel).
! Always check and re-solder o/p device SAP15N and SAP15P pin connections.
! Replace Z900 IC if software version is below version 3 ( note version 82 is also ok ).
!
Make sure R127 is not touching LK130.
!
When replacing the top cover with a new top it may be necessary to re-drill the fixing holes.
A65, A75 & P75 Service Guide
IQ setting Comments - (22/01/02)
37mV
37mV
37mV
12mV Set for 8.5mV cold, reset for 12mV when warm
12mV Set for 8.5mV cold, reset for 12mV when warm
12 to 15mV
12 to 15mV
12 to 15mV
Hints & tips
Action
Check mains fuse
Check transformer connections
Check power supply rails
Check power supply rails
Check protection circuit voltages
Check for dry joints on o/p devices
Check for dry joints around o/p
devices
Check supply to remote circuit
Check IC Z900
Check remote flex foil cable
Check for dry joints on selector pcb
Pull knob out from fascia
Check for component break down
using hot air gun & freezer spray
Check transformer connections
Voltage
+37 volts DC
-37 volts DC
0 volts
+15 volts DC
- 15 volts DC
+38 volts DC
+38 volts DC
-38 volts DC
-38 volts DC
+5 volts DC remote supply