GDP-32
II
INSTRUCTION MANUAL
May 2002 Section 17, Page 20
17.5 BATTERY AND POWER PROBLEMS
TROUBLE-SHOOTING POWER PROBLEMS
There are two general types of power problems:
low battery voltage
zero battery voltage as measured by the receiver
Low Battery Voltage
If the receiver is functioning, some battery power remains. When the voltage drops below 10.6
volts or rises above 15.5v, the Electronic Circuit Breaker activates and powers down the
receiver. The circuit breaker also activates in an overcurrent situation (e.g. I ≥ 3 A).
Once the fault condition has been eliminated (e.g., the batteries have been fully charged), the
circuit breaker should remain inactive when the power is cycled.
The actual voltage can be checked at any time with the Diagnostics Program (Section 17), or by
using a voltmeter to measure the voltage at the BATTERY CHARGE connector on the Control
I/O panel. See Figure 17.7.
Checking the Electronic Circuit Breaker (U35, BD287)
The Electronic Circuit Breaker turns power off whenever a fault condition exists. If the
Crystal LED on the front panel fails to illuminate altogether or just flashes momentarily,
follow the steps below to isolate the problem:
1. Make sure the batteries are fully charged and the fuse in the battery compartment is good.
2. Disconnect the wide blue ribbon cable at the motherboard that connects the front panel
board to the motherboard. Disconnect the red/blue/black 3-wire power cable at the 3-pin
Molex connector. This disconnects the front panel assembly from the analog and timing
section of the receiver.
3. Turn the receiver ON with the Power Button on the CONTROL I/O Panel.
If the Crystal LED stays illuminated:
Press
ON/OFF
button on the front panel to see if the MPU board boots up and displays the Zonge
logo. If the Zonge logo is displayed the circuit breaker is operating properly. This indicates that
there is a problem with the Analog Card Cage Subassembly.
1. Turn the receiver OFF.
2. Reconnect the blue motherboard cable and the red/blue/black power cable, and prepare
the receiver to remove the analog cards.
3. Pull the timing card and each analog card loose from the motherboard socket. It is not
necessary to remove the boards completely.
4. Re-insert the timing card and cycle the receiver ON. If the receiver will not turn on, there
is probably a short on the timing card and it needs to be repaired.
5. Assuming the timing card works okay, re-insert the channel 1 analog card and cycle the
receiver ON. If the receiver will not turn on, pull the analog card completely out of the
receiver and re-insert the channel 2 analog card and turn the receiver ON.
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