This is the original manufacturers service manual, with detailed info on the circit boards, explosion drawings of all parts in assembly order, and tuning instructions. The only thing missing is the information on the dimensions of the various drive belts. mail me if you need them. gcrossman_at_aol.com
This service manual for the Kenwood KT-990D was reproduced really well ,is very legible and manual is complete.Combined with the low price paid,in the future,I will be checking Owner-Manuals.com any time I need a manual.
Text excerpt from page 224 (click to view)
A790 N/B Maintenance
8.12 Modem Test Error
An error occurs when run the modem.
MODEM Test Error 1.Check if the driver is installed properly. 2.Check if the notebook connect with the phone LAN properly.
Test OK? No
Yes
Replace a known good modem
t ent e cr m Se cu c Do al iT ia Mt n e d fi n o C
Board-level Troubleshooting Correct it. Replace Motherboard
U506 J10 J14 J7 F505 L531 L527 H1 H2 H3 H4
Check the following parts for cold solder or one of the parts one at a time and test after each replacement.
following parts on the mother-board may be defective, use an oscilloscope to check the following signal or replace the
