Important Information for Service Stations and Customers |
Page 1 of 1 |
TECHNICAL INFORMATION
TASCAM FW-1884, Eliminating Bus-Power on FireWire
No. 0340
DATE 26th December 2003
There have been some reports arisen from the market that the FW-1884 does not communicate with the host computer. FireWire LED on the FW-1884 does not light.
Cause of problem seems to be on the host computer that may cause surges when “hot-plugging”. In this case, FireWire IC on the FW-1884 (U9 on the Main FW PCB Assy) is ruined. In the worst case, FireWire I/O section on the host computer is also damaged.
To reduce the risk of above possibilities, following change has been applied on the products with S/No. 0080001 and higher.
1.Eliminating bus-power that affords safety “hot-plugging”.
2.Adding an insertion sheet suggesting:
●How to place the FW-1884 in FireWire chain.
●Double-checking for a safer operation ― “make all connections with power OFF”.
To eliminate the bus-power, following components on the Main FW PCB Assy have been removed.
D6 |
DI, FM4002 CHIP |
F1/F2 |
RESETTABLE PTC 3425L150 |
Main FW PCB Assy
U9 |
FireWire connector
F1
D6
F2
N-3621
Important Information for Service Stations and Customers |
Page 1 of 1 |
TECHNICAL INFORMATION
TASCAM FW-1884, No Boot with STOP LED Lighting
No. 0341R
DATE 28th January 2004
This is the revised edition of Tech-Info No. 0341. See page 2.
Symptom: Occasionally the unit does not boot. At this time, only STOP LED lights.
Cause: +5 V has been supplied to U16 (PLL, Main FW PCB Assy) from two different sources. If there is a time difference between them upon booting, U16-14 will not generate the internal clock causing no boot.
Solution: Supply +5 V from an identical source (U49-3).
This change has been made on the products with S/No. 0080551 and higher.
Main FW PCB Assy Main (5/11) CLOCK, Grid (D, 4/5)
N-3626
Page 2 of 2
0341R
Main FW PCB Assy
cut
cut
Through Hole
● Cut foil: U16-1/2/3 ↔ Through Hole ● Cut foil: U16-18
● Jumper wire: U49-3 ↔ U11-1/2/3 ● Jumper wire: U49-3 ↔ U11-18
U11 → U16
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