Read Harman Kardon HD 990 (serv.man7) Service Manual online
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History
REV 1.0:
1.Make Pin1 of Y3 hang up.
2.Add R258 and C102, and both be valued "NA".
3.Add net mame "ATA_CS1#" "ATA_CS0#" "ATA
2.Add R258 and C102, and both be valued "NA".
3.Add net mame "ATA_CS1#" "ATA_CS0#" "ATA
、
、
_RDY"、"ATA_RST#"、"VFD_STB"、"DATA/SDA"、"CLOCK/SCL"、"IR"、"D[0..15]" and "A[1..19]".
4.Renamed net "CS_75710" as "CS_75711".
5.Renamed net "CS_1955_1#" in which Pin25 of U11 is connected as "CS_1955_2#".
6.Delete the Capacitors that connected Pin4,5,6 of JP5 and JP7.
7.Add FB11, FB12, FB13, FB14, CE20, CE42, CE51, CE52, CE54, CE55, CE56, CE57, CE58, CE59, CE60, CE61 and CE62.
8.Change the Y1's PCB Footprint into "DIP" Footprint.
9.Delete Y2, C83 and RN1 in the original schematics.
5.Renamed net "CS_1955_1#" in which Pin25 of U11 is connected as "CS_1955_2#".
6.Delete the Capacitors that connected Pin4,5,6 of JP5 and JP7.
7.Add FB11, FB12, FB13, FB14, CE20, CE42, CE51, CE52, CE54, CE55, CE56, CE57, CE58, CE59, CE60, CE61 and CE62.
8.Change the Y1's PCB Footprint into "DIP" Footprint.
9.Delete Y2, C83 and RN1 in the original schematics.
REV 1.1:
1.Add C165~C186, and all valued "NA";
2.Add U39, U40, T3, T4;
2.Add U39, U40, T3, T4;
4.Delete U9, U16, U18, U19, U21;
3.Add R259, R260, R265, R264, R261(NA), R262(NA), R263, R266, R267, R268, C164, C181, C182;
5.Delete C65, C104, C61, C71, R105, R119, R124, R129, R107, R108, R110, R111;
6.Change R99 to 100R;
7.Replaced U21D with U12D;
8.Renamed net "DAC_SDATA_R1" as "DAC_SDATA_L"; and Renamed net "DAC_SDATA_R2" as "DAC_SDATA_R".
6.Change R99 to 100R;
7.Replaced U21D with U12D;
8.Renamed net "DAC_SDATA_R1" as "DAC_SDATA_L"; and Renamed net "DAC_SDATA_R2" as "DAC_SDATA_R".
REV 1.2:
1.Change R5, R26, R46, R67 to 820R;
2.Add R272, R273, R274 valued 0R;
3.Add C187/0805-47pF and C188/0805-100nF;
4.Add U41/SN74LVC244;
5.Change R90, R91, R92 to 47R;
6Change some connections between U40A and U12C
7.Add a 47R resistance between U40 PIN5 and U12C PIN12.
8.Change 3.3V supply of JP4 to 5V.
2.Add R272, R273, R274 valued 0R;
3.Add C187/0805-47pF and C188/0805-100nF;
4.Add U41/SN74LVC244;
5.Change R90, R91, R92 to 47R;
6Change some connections between U40A and U12C
7.Add a 47R resistance between U40 PIN5 and U12C PIN12.
8.Change 3.3V supply of JP4 to 5V.
REV 1.3:
1.Add C198,R276.
REV 1.4:
1.Exchange L/R channel.
3.Add D22;
4.Change U2 and U6 from OP275GS to OPA2134UA;
5.Delete C3, C7, C17, C20, C25, C29, C39, C42, C12, C22, C34, C44, C4, C18, C26, C40, C5, C19, C27 & C41 and change them to C174, C168, C171,
C169, C182, C178, C180, C179, C173, C167, C181, C176, C183, C184, C185, C186, C172, C170, C177 & C175 MKP type caps one to one.
4.Change U2 and U6 from OP275GS to OPA2134UA;
5.Delete C3, C7, C17, C20, C25, C29, C39, C42, C12, C22, C34, C44, C4, C18, C26, C40, C5, C19, C27 & C41 and change them to C174, C168, C171,
C169, C182, C178, C180, C179, C173, C167, C181, C176, C183, C184, C185, C186, C172, C170, C177 & C175 MKP type caps one to one.
2.change R12, R33, R53 and R74 to 510R 1%.
6.Add C65, C66, C71, C67 & C190-C216.
8.Add CE52.
7.Add C217 & C218 be valued NA.
REV 1.5:
1.Add CON7; Add CE63; Add RF Test Point.
013_05_100 MAIN
HD990 main board
Harman Kardon
Custom
1
10
Saturday, September 13, 2008
Title
Size
Document Number
Rev
Date:
Sheet
harman/kardon
HD 990/230 Service Manual
Page 34 of 46
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