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| Germanium SB0550 Repair - Oct 10, 2007 - no Line-In signal getting to Line-In opamp U3 (15532) - no +12vdc to Line-In (U3) and ADC pre-processing opamps (U2 and U5) (15532's) - accidental probe short: "D-9 to what looks like C-15, left channel coupling capacitor" |
| By
bichi
on Oct. 12 2007 |
Size:
1.1MB |
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223 View(s)
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| Germanium SB0550 Repair - Oct 10, 2007 - closeup, U3 Line-In opamp installation and C15, C27 Line-In coupling caps - note amount of residual solder-flux and marginal soldering |
| By
bichi
on Oct. 12 2007 |
Size:
1.1MB |
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148 View(s)
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| Germanium SB0550 Repair - Oct 10, 2007 - closeup, uninsulated "paper-clip" type wire, left from troubleshooting
- note amount of residual solder-flux and marginal soldering |
| By
bichi
on Oct. 12 2007 |
Size:
1,005.9kb |
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158 View(s)
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| Germanium SB0550 Repair - Oct 10, 2007 - Uninsulated "paperclip" type wire and "shorting loops" removed - excess solder and flux removed - PCB holes cleared of solder |
| By
bichi
on Oct. 12 2007 |
Size:
899.2kb |
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70 View(s)
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| Germanium SB0550 Repair - Oct 10, 2007 - 2min ultrasonic cleaning bath and 2hr drying cycle - L12 missing: might have "blown off" when accidental short occured - looks to be standard "ferrite bead" type inductor - should be connected to "tip" on Line-In/MIC/Flexijack |
| By
bichi
on Oct. 12 2007 |
Size:
922.8kb |
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88 View(s)
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| Germanium SB0550 Repair - Oct 10, 2007 - removed relays and "flexijack" - check relays for open coils and burn-contacts - look for burnt PCB traces under relays and flexijack - discovered one burnt trace related to "tip" and "missing" L12 - SW2 relay contacts, 7,8,9 are open and needs replacement |
| By
bichi
on Oct. 12 2007 |
Size:
732.3kb |
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74 View(s)
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| Germanium SB0550 Repair - Oct 12, 2007 - burnt trace repair - 30awg Kaynar wire, held in place with masking tape, prior to soldering - thin layer of epoxy will be added after trace repair - shown with Flexijack and relays removed |
| By
bichi
on Oct. 14 2007 |
Size:
400.9kb |
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55 View(s)
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| Germanium SB0550 Repair - Oct 12, 2007 - R35, 4.7ohm, +12vdc Limit Resistor OPEN, (shown removed) - supplies +12vdc to U3, U2 and U5 opamps - R12, 4.7ohm, -12vdc Limit Resistor - C19 and C17 and X-FI LED Cover removed, space for replacing burnt/open R35 |
| By
bichi
on Oct. 12 2007 |
Size:
438.4kb |
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121 View(s)
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| Germanium SB0550 Repair - Oct 12, 2007 - R35, R12 replaced with 3.9ohm low-noise, 1%, 0805 - both replaced to keep +/-12vdc balanced - C19, C17 and X-FI LED Cover reinstalled |
| By
bichi
on Oct. 13 2007 |
Size:
400.5kb |
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86 View(s)
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