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Now downloading free:Johnson JM-150  [report bad file]  

Professional audio systems service manuals and repai information

File information:
File name:JM150 MAIN SCHEMATIC.pdf
[preview JM-150] new window
Size:371 kB
Extension:pdf
MD5 Checksum:886cae8a21623f29566a378844126c58
Mfg:Johnson
Model:JM-150
Original no||Chassis||Ordercode:
Description:Johnson JM-150 - preamp schematic diagram
Group:Electronics > Consumer electronics > Audio > Professional >
Uploaded:2010-02-19 20:39:56
User:krisbg
Multipart: 0  1

Information about the files in archive:
Decompress result:OK
Extracted files:2
File nameRead resultText
JM150 AMP SCHEMATIC.pdfREV DISCRIPTION ECN DATE REV ECN DATE P0 PROTOTYPE, POWER AMP BOARD 11-26-96 P1 PROTOTYPE, POWER AMP BOARD 3.14.97 P2 PROTOTYPE, POWER AMP BOARD 4.30.97 A0 RELEASE TO PRODUCTION REV A0 5.5.97 A1 ADD 2 SPACERS TO PARTLIST 6.13.97 A2 CHANGE VALUE OF R25, R22, R26, JP7 ADD 3 (28-0058), 2 (28-0059), DEL 3 (28-0060) ADD 1 680PF CAP IN PARALLEL WITH L6 1851 10.31.97 A3 1961 1.6.98 A4 UPDATE RIBBON CABLES TO KEYED ONES TO AVOID CONFUSION. REPLACE R46 AND R63 W/ 52-0376. 2063 3-4-98 B0 HOLE SIZE CHANGES ON THE BOARD, RELEASE REV B 2182 4.22.98 |LINK |056094B0.001 |056094B0.002 Digitech 8760 South Sandy Parkway Sandy, Utah 84070 Title JM150 AMP Power/Jack Board 80-6094 Size B Date: Document Number 056094B0.000 Tuesday, October 05, 1999 Sheet 0 of 2 Rev B0 +42V R94 18K R82 4.7K C19 47S63E 2 1 2 Q18 TIP142-HR 3 D12 1N4005R R78 10K R56 2K R84 4.7K D10 1N4148R D11 1N5237B R93 3.3K 1 Q16 TIP142-HR 3 H2K PA7X2 11 2 Q12 MPSA56 1 R81 1.00K 1% 2 Q15 2
JM150 MAIN SCHEMATIC.pdfREV DISCRIPTION ECN DATE REV ECN DATE P0 PROTOTYPE, POWER AMP BOARD (NOT THE SAME LAYOUT) 8.20.96 AM CHANGE TUBES TO 76-0002 480 3.30.99 P1 PROTOTYPE, ADD MAIN BOARD, THEN REMOVE POWER AMP SECTION 11-8-96 AN CHANGE SDISCII FROM 72-3180 TO 72-5500 620 6.21.99 P2 PROTOTYPE 1-2-97 AP CHANGE LITHIUM BATTERY AND HOLDER TO BUTTON BATTERY W/TABS. 1266 6-6-00 P3 PROTOTYPE 3.11.97 AQ Install V 1.140 Software 1546 02-06-01 P4 PROTOTYPE 3-19-97 A0 PRODUCTION RELEASE 5-3-97 A1 CHANGE SOME PART VALUES, ADD TWO 1N4148 DIODES. 5-21-97 A2 CHG (V1) TUBE FROM SOVTEK 12AX7WA (76-0002) TO GROOVE TUBE 12AX7 1683 (76-0001). REMOVE C261, C262, AND C263. 6-20-97 A3 ADD 50-0317 AT POSITION C103. 1705 7-16-97 A4 REPLACE 5" RIBBON CABLE (32-1204) W/ 7" RIBBON CABLE (32-1219-A). 1709 7-16-97 A5 CHANGE FLASH EPROM FROM V1.00 TO V1.01. 1828 10-21-97 CHANGE RESISTOR VALUES: A6 R249 TO 330 OHM. R124 TO 330 OHM; R250 TO 680 OHM; 1852 10-30-97 MOVE GROUNDING B

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