Tascam FW-1884 Service manual

Important Information for Service Stations and Customers

TECHNICAL INFORMATION

Page 1 of 1

TASCAM FW-1884, Eliminating Bus-Power on FireWire

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

No. 0340 DATE 26th December 2003

U9

FireWire connector

F1

D6

F2

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Important Information for Service Stations and Customers

TECHNICAL INFORMATION

Page 1 of 1

TASCAM FW-1884, No Boot with STOP LED Lighting

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)

No. 0341R DATE 28th January 2004

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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