FNIRSI Oscilloscopes for
Repair Hobbyists.
Fix what others throw away. Diagnose vintage audio gear, retro game consoles, and broken electronics with proper test equipment. See exactly what’s wrong—no more guesswork.
What You Can Diagnose
Vintage Audio Equipment
Trace signal paths through amplifiers, find noisy capacitors, diagnose distortion. See exactly where the audio chain breaks down in old receivers and amps.
Retro Game Consoles
Fix NES, SNES, Mega Drive, and other classics. Check video signals, clock circuits, and controller inputs. Bring dead consoles back to life.
Power Supply Testing
Check for ripple, noise, and voltage stability. Find why equipment acts erratically. Verify capacitor replacements actually fixed the problem.
CRT Monitors & TVs
Diagnose horizontal and vertical circuits, check flyback transformers, trace sync signals. Essential for vintage computer and arcade repairs.
Clock & Timing Circuits
Verify oscillators are running at correct frequencies. Find intermittent clock issues that cause random crashes and lockups.
Component Testing
Check transistors, verify op-amp operation, test capacitors under load. Go beyond what a multimeter can tell you.
Recommended for Repair Hobbyists
FNIRSI DSO510 Mini 2-in-1
50MHz • 200MSa/s • Portable • 2.4″ LCD • Built-in Signal Generator
FNIRSI DST-210 3-in-1
10MHz Scope • 50MSa/s • 10000 Counts DMM • Signal Generator • 2.8″ Display
FNIRSI 2C53T 3-in-1
50MHz • 250MSa/s • 2 Channels • 20000 Counts DMM • Signal Generator
FNIRSI 1014D 7″ Touchscreen
100MHz • 1GSa/s • 2 Channels • DDS Generator • 7″ Touch Screen
Why Repair Work Needs an Oscilloscope
A multimeter tells you there’s 5V on a rail. An oscilloscope shows you the 500mV of ripple riding on top of it—the actual reason your equipment is misbehaving.
For repair work, you need to see signals over time: audio paths, clock signals, video timing, power quality. That’s what separates a quick diagnosis from hours of guessing.
- Trace signal paths through audio stages to find where it breaks
- Find bad capacitors by checking for ripple and noise
- Verify clock signals are present and at correct frequency
- Compare before/after to confirm your repair worked
Symptom: Amp has loud hum
Multimeter says:
Power rail = 24V DC ✓
“Looks fine”
Oscilloscope shows:
Power rail = 24V DC + 800mV ripple
→ Filter caps are shot
// Replace C12, C13 → hum gone
What Bandwidth Do You Actually Need?
| Repair Type | Typical Signals | Bandwidth Needed | Recommended |
|---|---|---|---|
| Audio Equipment | 20Hz – 20kHz audio | 10MHz is plenty | DST-210 (£49) |
| Power Supplies | DC + ripple, switching noise | 20-50MHz | DSO510 (£38) |
| Retro Consoles (8/16-bit) | 1-20MHz clocks, video | 50MHz | 2C53T (£94) |
| CRT Monitors | 15-31kHz H-sync, flyback | 50-100MHz | 2C53T / 1014D |
| Modern Electronics | Faster clocks, USB, HDMI | 100MHz+ | 1014D (£127) |
What Repair Hobbyists Say
“Fixed a 1970s Marantz receiver that three shops gave up on. Scope showed the bias oscillator was drifting. £15 in parts later, it sounds better than new. This scope paid for itself on day one.”
“Retro console repair is my thing. Dead SNES with no video? 5 minutes with the scope found a missing clock signal. Game Gear with bad caps? Scope confirmed the fix worked. Essential tool.”
“The handheld form factor is perfect. I can probe around inside equipment without a bulky bench scope taking up space. Battery powered means I can use it anywhere in the workshop.”
Repair FAQ
Common questions from people repairing vintage audio, retro consoles, and other electronics.
Ask Us AnythingFix What Others
Throw Away.
The right tools turn “unrepairable” into “fixed it myself.” Get an oscilloscope and start seeing what’s actually wrong. From £38, delivered in 1-2 days.