User's Manual

RPT 633
Page 5 - 10 TM1184 Issue 1
GREAT CARE MUST BE TAKEN TO AVOID BREAKING OPEN THE
ENCAPSULATION OF TR10 ON THE TRANSMITTER BOARD WHEN REPAIR OR
COMPONENT REPLACEMENT IS BEING CARRIED OUT, AS THIS COMPONENT
CONTAINS TOXIC BERYLLIUM OXIDE.
FAULT-FINDING
WARNING
17. Table 4 shows the signals to be expected at the various test points as an aid to
fault-finding.
Table 4: Test Points
T.P. SIGNAL
1 Carrier Frequency
2 Tx Key (low-going)
3 PLL Control Voltage (nominally 5V)
4 VCO Frequency (div. by 256)
5 Crystal Frequency
6 In-Lock (high going)
7 Modulating Signal
8 -12V
9 0V
10 Audio Signal (limited)
11 Audio Signal (un-limited)
12 Over-rides Lock Fail when connected to TP13
13 +12V
14 Data
15 +5V