Μ-Com Circuit - NAD T512C Service Manual

2. µ-COM Circuit
A. No Power
YES
Does Logo appear
on the screen?
YES
OK
1
Is oscillation of
X501 normal?
YES
Are IC503 Pins 193, 80
and 81 normal?
YES
A
appear at FLD?
Does no DISC appear?
NO
NO
NO
Check the oscillation
NO
Check short.
OK
Replace IC501
POWER ON
NO
Does Hello
Is P5901
NO
connected normally?
Reconnect it.
Refer to Front Part
Check short
Replace IC301.
3-3
YES
Check power.
(Refer to power)
If power is
normal
NO
Is P5901 Pin 23 normal?
YES
A
The waveform
NO NO
on AD(00~21) of IC501
normal?
YES
NO
Are IC301 Pins 5, 26 normal?
YES
Replace Main B/D.
1