FM25B • 24
rior wiring of your home or building. Do not attempt such an installation unless
you know exactly what to do and not to do. Also, because such an installation
is beyond the original purpose of this kit and the safety standards intended for
all Ramsey kits, and because we have not tested the FM25B in such an instal-
lation, we cannot provide further details.
TROUBLESHOOTING GUIDE
If your FM25B does not work at all, re-check the following:
• correct orientation of U1, U2, U3, and U4 (see PC board layout diagram)
• correct polarity of all electrolytic capacitors
• correct orientation of diodes D1 – D17
• correct orientation of Q1, Q2, and Q3 transistors
• all parts are installed as close to the printed circuit board (PCB) as possi-
ble without stressing their leads
• Q1 output is close to 12 VDC +- 2VDC
• No shorted traces on the pins of J4 or J5
• No shorted traces on U4, the main RF output amplifier.
• all solder connections.
Hints
• Erratic or unstable operation is caused by faulty solder joints or cable con-
nections.
• Replacement IC chips (including the stereo transmitter IC) may be or-
dered directly from Ramsey Electronics, Inc. but records show that IC fail-
ure rates for these parts are extremely low.
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