Harman Kardon CD491 - Page 75

‘@harman/kardon Service Bulletin
SERVICE BULLETIN #4005 - DECEMBER, 1984
TO: ALL HARMAN KARDON WARRANTY STATIONS
MODEL: CD391/CD491 STEREO CASSETTE DECK
SUBJECT: POP SOUND RECORDED ON TAPE
In the event you receive a CD391 or CD491 Cassette Deck with the
complaint "unit records pop or bleep on tape when placed in
record pause mode" we recommend you solder on the micro processor
PC Board a signal diode between IC 801 and IC 852.
The anode of this diode is connected to PIN 6 of IC 801 and the
cathode of this diode is connected to PIN 14 of IC 852.
The purpose of this diode is to prevent the transport from
rewinding the tape momentarily at the moment the pause button is
r ) depressed.
Due to this momentary rewind of the tape while the bias oscillator
is on, the bias signal will be recorded on the tape at high tape
speed. When the tape is played back this high frequency signal
becomes audible.
The modification indicated above will prevent this momentary rewind.
Harman Kardon Incorporated, 240 Crossways Park West, Woodbury, New York 11797 (516) 496-3400 TELEX: 22 99 11 HARMN UR