Kenwood SB 2016 for KR 4400 KR 5400 KR 4006 Service Bulletin
This is the 2 pages manual for Kenwood SB 2016 for KR 4400 KR 5400 KR 4006 Service Bulletin.
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Extracted text from Kenwood SB 2016 for KR 4400 KR 5400 KR 4006 Service Bulletin (Ocr-read)
Page 1
1) Left channel output signal (or R-Ch output signal) is applied to point "a" through Rl (or R2). 2) AC output signals are bypassed via Cl to ground and do not activate the circuit. 3) Because of the increased base voltage Ql is turned on and the Ql collector voltage decreases. As a result, the voltage at "d" also decreases and Q2 is turned off. SB 2016 4) If a negative DC voltage appears at "a", this voltage appears at "d" through Dl and D2, so that Q2 is turned off. 5) R4 and C2 have a time constant. Therefore, there is a time delay after the power switch is turned on until the relay closes. 6) D3 (Zener Diode) improves the switching characteristic of Q2 and allows a quicker release of the relay when the power switch is turned off. Additional information including schematic and parts list are found on the attached sheet.