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Reference Oscillator Test (Continued)
Continued
from previous
Page
Check 33.6 MHz at
the TCXO output
at C670 (high
impedance probe).
Is
the voltage
P-P 0.6 < Vp-p
< 1Vpp?
Pass
The TXCO
is functioning
correctly.
6880401P26-O
Check
Fail
voltage at
C650.
Is
the voltage
2.775V +10%
?
Pass
Check voltage
V2 supplies into
SLEDGEHAMMER at
R652, R653, R654 and R699
Is
the voltage
2.775 Vdc
?
Pass
Replace Y002.
TROUBLESHOOTING: Reference Oscillator Test
Is the
Fail
Voltage at R651 ~
2.775 Vdc
?
Pass
Fail
Go to DC distribution
flow charts for V2.
95
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