Troubleshooting The EON 10-G2
Excessive current draw problems (shorted component)
Shorted output IC’s
U1, U2, U3
Shorted Power supply components
C62, C63, BR1, Q3, Q4, D5 and D6
XFRMR primary/secondary shorted together
No voltage/missing voltage/low voltage problems (open/shorted component)
Verify proper a.c. input voltage.
If all internal voltages are absent,
Check that fuses F3 and F4 are ok? Should be 2.5amp 2AG.
If ok, check if transformer is open? Transformer should have continuity
in primary and secondary windings. Unplug Secondary from Main PCB
and verify a.c. output voltage. At pins 1&3 on P2, it should read 44Vac.
Power supply ok? ±29Vdc at C62, C63?
±15Vdc at C61, C58?
Supply voltages at all 3 output IC’s on Pins 1,5 and Pin 4
If not ok, repair, verify and continue.
Verify ±15V at P1 pins 3& 4 on Main PCB and to P1 on input/output PCB
If absent, locate, repair and continue.
No sound (possible missing control voltage)
Verify ±15Vdc at P1 pins 3 & 4 on input/output PCB
No sound (voltages are okay),
The quickest way to isolate this problem to a specific PCB is to start with a known good
input /output PCB. Most failures are related the main amplifier or to components under
the most stress.
If problem exists on the input PCB,
Verify signal input to unit at J2 pin 2.
Verify signal output at pin 1 of P1
If no signal then verify output signal on U4 , U5, U2, U3.
Signal trace PCB accordingly using circuit descriptions.
If problem exists on main amplifier board,
Verify input signal to Main Amplifier PCB at pin 1 of P1
If no input signal at P1, replace 8-pin cable assembly
Measure dc offset on output of IC’s U1, U2, U3
If more than 2Vdc, replace defective output IC
If dc offset is ok, continue to verify input at pin 10 of remaining output
IC’s
if ok, verify status of mute pin 8 on output IC.
To Next Page
Loading...
Need help?
General