Cornford_mk50hii 电路图 维修原理图.pdf
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Cornford_mk50hii 电路图 维修原理图.pdf
1 meg 68k 39k 180k .0047 68k .033 0.1 330 pF 0.33 100 pF 25k lin 250k log 250k lin 1M log 100k 4k7 250k log 1k5 2.2uF 2.2uF 1k5 15k 100k100k 1M log .022 470 pF 680k470k 470k 470 pF .033 1 meg 1 meg 100k 1k5 330 R 330 R .033 .033 1k5 220k 250k lin 1M log 25k lin 220 pF 0.1 15k 43k 0.1 .033 1 nF 470k 25k lin 1k5 1N4007 Relay 1B N.C. N.O. N.O. N.C. Relay 1A .033 2N5462 2N5462 To Effects Send Sockets 5 Volt supply Pin 3 on 6-pin DIN socket Front panel switch Mute Send Signal Pin 2 on 6-pin DIN socket Low Current Green LED on Front Panel Low Current Red LED on Front Panel 5 Volt supply 100k 0.1 100 pF H.T. G H.T. F H.T. E MK50II Pre-amp Circuit design and drawing by Martin Kidd 25/01/11 100k 收音机爱好者资料库 Ra d i o Fa n s .CN Relay 2 N.C. N.O. Relay 3 N.O. N.C. Send 1 Send 2 Return 2 Return 1 1N4007 .033 Mute send signal 1 meg 1k5 220k Mute point 5 Volts Effects loop 1-2 footswitch 22k -Watt 47uF 450V .033 220k 1 meg log 1 meg log Master 1 Master 2 5 Volts 1N4007 To Phase Splitter 1k5 Low Current Green LED Signal from Relay 1B Pin 2 on 6-pin DIN socket H.T. D MK50II Effects Loop Circuit design and drawing by Martin Kidd 25/01/11 收音机爱好者资料库 Ra d i o Fa n s .CN Bias Supply B+ 91k100k 1 meg 1 meg 470 R 10k 4k7 0.1 25k lin 0.1 .0047 47k 1 meg log 100uF 63V 1k 4W 1k 4W 220k 10k 10k .022 .033 .033 100 pF H.T. C H.T.D 16 ohm 8 ohm 4 ohm common blue brown green red white black (yellow) From Master Volumes 1 ohm 1-Watt 1 ohm 1-Watt MK50II Output Stage including Phase Splitter Circuit design and drawing by Martin Kidd 25/01/11 收音机爱好者资料库 Ra d i o Fa n s .CN Centre tap not used 3.15 Volts a.c 3.15 Volts a.c To all heaters C.T. Mains Switch Standby Switch 47k Fuse: T2A for 230V or T4A for 115V Short red line indicated series winding for 230V operation. Dotted Blue and Magenta lines indicate parallel wiring for 115V operation. Mains inlet socket 7805 2200 uF 25V Brige rectifier module 5 Volt supply 50+50uF 500V 50+50uF 500V 47uF 450V 47uF 450V 47uF 450V 100R 7W 10k 3W 10k 3W10k 3W 10k W 4x 1N4007 brown white black blue yellow yellow black black red red wh/bk wh B+CDEFG 1N4007 10k 22k 220k 220k 100uF 63V SPST Switch for 6L6/EL34 Bias voltage Front Panel Mains Indicator MK50II Power Supply H.T. Fuse: T500m.A pink Circuit design and drawing by Martin Kidd 25/01/11 0.1 uF 2N5462MAC97 220k Mute Send Signal Mute point on effects loop MK50II Mute Circuit 5 Volt Circuit design and drawing by Martin Kidd 25/01/11
