Broadcast Electronics AM-2.5E, User Manual

Page: 97 / 320

5-12
WARNING: DISCONNECT POWER PRIOR TO SERVICING
TABLE 5-2. AM-2.5E/AM-5E TROUBLESHOOTING
(Sheet 4 of 5)
SYMPTOM CIRCUITRY TO CHECK
RF DRIVE INDICATORS 1. Check the RF drive output on the ECU motherboard
EXTINGUISHED FOR A as follows: 1) output 1 -P101-7 and 2) output 2 -
POWER BLOCK P101-47 (AM-5E only).
1. If no RF drive is present, refer to the ECU
section and troubleshoot the exciter circuit board.
2. If RF drive is present at the exciter circuit board,
check bridge rectifiers D10 and D11 on the power
supply module for the power block.
2. Refer to the RF POWER MODULE section and
troubleshoot each RF power module.
LOW DEMODULATOR LEFT 1. Refer to the ECU section and troubleshoot the
CHANNEL MODULATION LEVEL exciter circuit board.
WITH LOW EXCITER
MONITOR LEFT CHANNEL
MODULATION LEVEL
LOW DEMODULATOR RIGHT
1. Refer to the ECU section and troubleshoot the
CHANNEL MODULATION LEVEL exciter circuit board.
WITH LOW EXCITER
MONITOR RIGHT CHANNEL
MODULATION LEVEL
LOW DEMODULATOR LEFT
1. Refer to the ECU section and troubleshoot the
CHANNEL MODULATION LEVEL stereo circuit board.
WITH NORMAL EXCITER
MONITOR LEFT CHANNEL
MODULATION LEVEL
LOW DEMODULATOR RIGHT
1. Refer to the ECU section and troubleshoot the
CHANNEL MODULATION LEVEL stereo circuit board.
WITH NORMAL EXCITER
MONITOR RIGHT CHANNEL
MODULATION LEVEL
PWM DRIVE INDICATOR
1. Refer to the ECU section and troubleshoot the
EXTINGUISHED ON A POWER exciter circuit board.
BLOCK
PWM DRIVE AND RF DRIVE
1. Refer to the ECU section and troubleshoot the exciter
INDICATORS EXTINGUISHED circuit board.
ON ALL POWER BLOCKS