Nokia RH-57 Series Troubleshooting Manual page 22

2112 (RH-57)
Troubleshooting - RF
Step # Part
TP3 I+, I-, Q+, Q-
TP4 C728T
TP5 C711T
TP6 L708R (L708R
for Prod
Probe)
TP7 C731T
TP8 R702L
(C703R)
TP9 R703T (R701L,
R715T)
TP10 C734B
TP11 C712R, C744R
TP12 C710T, C704B
* The R, L, T, and B values at the end of the part numbers indicate the Right, Left, Top, and Bottom
side of the part respectively in Figure 13.
Page 22
Table 13: Rx IF Troubleshooting (Continued)
Typical
Value/
Function
Frequency
HP85024A
I/Q outputs 300KHz tone
of Yoda N700 for input:
881.22MHz
19.2MHz In +6.5 dBm
19.2MHz
19.2MHz Out +4 dBm
19.2MHz
VHF VCO +1.0 dBm
367.2MHz
VREF 1.35Vdc
RX_IF_AGC 0.2 to 1.8 Vdc
VR7 2.7Vdc
VR3 2.7Vdc
VR6 2.7Vdc
VIO 1.8Vdc
©2004 Nokia Corporation
Nokia Customer Care
Typical
Value
Comments
Frequency
Prod Probe
-69/-84 dBm Baseband differential out-
300KHz puts of the IF IC (N700). To
test: set the input to 881.22
or 881.82MHz/-75dBm to
get a 300KHz tone when
receiver is on channel 384
(881.52MHz)
-22 dBm Sine wave input to N700
19.2MHz from VCTCXO.
-25 dBm Square wave output of N700
19.2MHz to baseband.
-61 dBm Rx VHF VCO - Fixed at
367.2MHz 367.2MHz (Be careful not to
load the circuit with the
probe.)
System reference voltage
1.35Vdc from UEM.
AGC control Voltage. 0.2V =
Max Gain, 1.8V = Minimum
Gain
VHF VCO Supply from UEM
VCTCXO buffer supply from
UEM.
Main supply to N700, from
UEM.
Digital circuits supply from
UEM.
Company Confidential Issue 1 07/2004