Specifications

6.2.6 Instructions for Factory Service
Please include a note with any specific information available about the equipment failure as an aid to our technicians.
Pack equipment carefully to avoid further damage in shipping. We are not responsible for damage during transport.
When returning a system with multiple components, we strongly suggest that you return the entire system. We will
repair the parts that are returned but lightning is rarely selective enough to damage only a single part of a system.
Be sure to include a street address for return shipping by UPS. The repair will be delayed if you neglect to give us
enough information to return your equipment--this actually happens! If you prefer a carrier other than UPS or wish us
to bill to your shipping account, we can usually accommodate these requests. Many carriers do not accept COD
shipments so credit card billing may be required for carriers other than UPS. If you do not specify otherwise, return
shipments will be made by the UPS equivalent of the received shipping method (i.e. Ground shipment, 2nd Day,
Overnight).
We suggest that you verify our shipping address before sending equipment for repair. Same day service does not
apply if you ship to an incorrect address and/or the carrier delivers the equipment too late in the day for repairs to be
completed. Sine Systems is not responsible for equipment that is not delivered to our factory. It will be your
responsibility to contact the carrier to retrieve your improperly delivered equipment.
6.3 Repair Procedure
!
The DAI-2 and its relay panel should be installed or repaired only by qualified technical personnel. An
attempt to repair this device by a person who is not technically qualified could result in a hazardous
condition to the installer or other personnel, and/or damage to the DAI-2 or other equipment. Please
ensure that proper safety precautions have been made before installing or repairing this device.
Because the DAI-2 is an FCC registered device, it must not be modified in any way. Any components
which are replaced must be replaced with ones of exactly the same type and rating. This is particularly
critical in the circuitry involving connection to the telephone line. Unless repair is performed by a
properly qualified technician, it is strongly recommended that the DAI-2 be returned to Sine Systems for
repair.
The first step in troubleshooting should be to look for signs of burned or otherwise damaged parts. U9 may run a little
warm but should not be hot enough to burn or discolor the PC board. Check the incoming DC voltage (12 volts).
Check for +5 volts DC at the output of the regulator (U9). The bottom two resistors in the SIP network R10 form a
voltage divider which generates a midpoint reference voltage for the analog circuits. Check to see that this is one-
half the main power supply voltage. If it is not, something is pulling it up or down. The current consumption of the
DAI-2 at 12 volts DC should be about 80 milliamperes. If it is significantly more than this, remove the ICs one at a
time until the current drops.
DAI-2 Troubleshooting and Repair page 6. 4