Nokia RH-10 Series Troubleshooting Manual page 24

RH-10
Troubleshooting
Probing
Probing Point Location on
the board
UHF LO at 10, Figure 1.
1009.62 MHz for Can probe on
channel 384 top of plastic
to check for
presence of LO,
but won't read
accurate
power
VHF LO at 11, Figure 1
346.2 MHz for cell (You can touch
band, any channel top of plastic
to verify pres-
ence of LO, but
this won't
measure
amplitude
accurately.)
Page 24
Table 2: RF/Analog Probing for Transmitter
Probed Absolute Power (dBm) or
gain/loss (dB) or voltage (v)
Power approx. -3 dBm
Voltage on Robin UEM output for mode with test turned on
Nokia Corporation
CCS Technical Documentation
Where to start checking if RF
power not correct (soldering,
shorts, DC power applied if
active, correct voltage of DC
signals, otherwise replace)
If LO is present but off freq (could
be off by hundreds of MHz), then
VCO G502 is at least putting out a
signal. If LO not present, check
G502, R507, R505, R515 first. Else,
check C511, C501, C532, C550,
R550, C509, R503, C508, R508,
C518, N501, R506, C516, C515,
C521, R513, C504. Lastly, check
R523, R519, R509.
N601, C612, C613, R607, R605,
C632, R606, C618, R609, C629,
V602, C637, V601, C630, C631,
L611, C638, R604, R601, R602
Confidential Issue 1 09/2002