Troubleshooting Flow Chart For Vco - Motorola GP328 Detailed Service Manual

6E-30
No TX LO or No
signal at U205 Pin
32 in TX
Check signal at
collector of Q201
Level >
+2 dBm
No
Check signal at
drain of Q203
Level >
-3 dBm?
No
Check C215, C216,
L207, L208, L209,
U203
Problem
fixed?
Yes
Done

Troubleshooting Flow Chart for VCO

Check L204, L211, L212,
Yes L215, C221, C228, C229,
C230,C231, C235,C297,
R204, R234, R238
Yes
No
Replace Q203
Replace Q201
Replace Q202
and Q204
Troubleshooting charts
No RX LO or No
signal at U205 Pin
32 in RX
Check signal at
collector of Q201
Yes
Level >
+10 dBm?
No
Check signal at
drain of Q202
and Q204
Yes
Level >
+7 dBm?
No
Check DC volt-
age across R203
No
Level >
500 mV ?
Yes
Check C200, C202, C203,
C222, C223, L201, L203,
TR201, CR202