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This is the second Manual I have ordered from owner-manuals, I give it five stars because it is exactly what I expected given the age of the equipment. So the contents look a bit aged and the pictures a bit grainy, it fulfills my needs and I am glad I can still get hold of them.
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thank u so much for this manual that was so cheap that i thought it was a scam but i gambled anyway because it was too good of a deal to pass up and behold,the manual has everything and details of everything even the screws and im still amazed and very happy with my manual .so take my word and jump on it before they realize how cheap they selling thier manuals..thank you so much for taking time to read my thoughts
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I do not have very much to say.
The price is quite covenient, delivery was better as promised (about 12 ours, against the specified 24 hours if I remember well), and the quality of the PDF is more than acceptable.
The Service Manual of Sansui R30 itself is also satisfactory: good graphic for schematics and layouts, simple and well structured.
Giovanni Bianchi
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Happy to find finally a schematic for this amplifier. The schematic is of good quality, the pcb layout is useless: all is black. Never the less, it is very easy to find the components on the board using the schematics.
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Hard to find manual was ready the next day. Scans were very legible (including schematics). All the essential parts of the service manual were present (adjustment procedure, schematics, and parts list). It would have been nice if the rest of the manual was included (disassembly procedure, theory of operation, etc.).
Model 428B 5-59. TROUBLESHOOTING. 5-60. FRONT PANEL TROUBLESHOOTING. 5-61. The Front Panel Troubleshooting Tree was designed for use as a means to guide the repairman to a block of circuitry. This procedure, in combination with the adjustment, calibration, and performance checks should be adequate to repair most 428B's. 5-62. In any case where the front panel troubleshooting does not lead to the problem, it will be necessary to troubleshoot the instrument in detail. 5-63. DETAILED TROUBLESHOOTING. 5-64. Probe Check. 5-65. Resistance between pins 1-3, 1-4, 2-3, and 2-4 of the probe cable connector should be nearly identical and in the area of approximately 4 1/2 to 5 ohms. Where a resistance measurement between any of the above pairs of pins is significantly higher than between the other pairs (by about 3 times), an open probe coil is indicated. Any open circuit indicates a broken conductor between the plug and the bridge. The broken conductor is probably a broken wire in the cable. Either condition could indicate a broken wire at the Probe Terminal Section (see wiring diagram, Figure 6-1). 5-66. Power Supply Check. 5-67. To test the power supply: a. Measure +272 ±6 Vdc between Test Point 5 and ground. b. Measure +12 ±1 Vdc between the cathode of CR10 and ground. c. Measure -7 ±1 Vdc between the anode of CR9 and ground. 5-68. Where the +272 V and the +12 V have both failed, check the +12 first. Check CR10, Q1, C66, and C69.
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