more than likely is a logic card or something along those lines,dont work on alot of Daewoos or AC trucks but is what im thinking it has to be a card of some sort.....

Thank you Kevin,
when the manual asks for logic replacement, what exactly is that refering to?

7777.......

Check your line contactor for welded tips: Manual states.....

In case of alarm follow this procedure:
1. Verify the correctness of wiring from pump
motor and relative inverter;
2. Replace cable connecting the output CN4 of the
logic with the corresponding inverter;
3. Replace the inverter connected to CN4 output
of the logic;
4. Verify if main breaker has stuck closed
terminals: in such a case replace it;
5. Replace the cable connecting the output CN1 of
the logic to the right drive motor inverter: a
defective cable could give a wrong measure for
capacitors voltage;
6. Replace the right drive inverter;
7. Replace logic.

Maybe someone can also shed a light on this B15T-5, H4-00213, 2000 model. No lift, no drive.
I get a code: A, w/ an alarm. The manual states the pre charge capicitors are less than 70% of battery voltage. This is because the line contactor is not closing and draining the capaitors in attemp to energize the drive motors. Fuses are good, did not open the line contactor to look yet.
Does anyone have any ideas before I open the truck?

Hi Guys,
I have a similar problem on B-15-T (2001 dc modle) which shows a flashing F-5 after switch on. Line contactor drops out etc. So far I have swapped LHS & RHS motor cables (at the contactor), the transistor packs and the current sensors (all side to side) but no joy so far. I think it may be a logic but would like to prove it.

Just wondered if anyone can shed any light on this or does anyone have a manaul?

I have a problem with a Daewoo forklift BR15s appears the fault code F5, when you turn the machine enters and leaves the contactor which activates the hydraulic system and power steering only works, not forward or back.

Hello John,
I have 9 of these machines and they can be very troublesome to diagnose. I dont have my manual with me now, but can send you the Daewoo manual in PDF form during the week. The faults usually are the Logic itself, or the main drive amps. One thing that ruins the power amp and logic is the batteries go too low in voltage. Factory spec is 45 volts! i raised the cut out to 47...as high as it goes. Since Daewoo does not have the lift cut out when the battery is low, the drivers tend to keep going even when the alarm goes off...dragging the battery down and raising the amps. Also, none of my trucks had fans, causing more failures. It's not uncommon to blow the logic and a power amp. from a low or shorted battery. also, the steer pot must be centered or the truck will send too much current to the inside drive motor on tight turns. You need the flashware to adjust this!
To diagnose a bad power amp, swap the left and right with each other and see if F6 appears.
I'll re-check my codes on Monday. If you would like the service manual, i can email it to you.