Audio Repair

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  6. Yamaha
  • Trusted Audio Maintenance: Regular maintenance is important to keep your Marantz audio equipment running smoothly. We offer maintenance services to keep your equipment in top condition.
  • Expert Audio Repair Services: Our team of experienced technicians can diagnose and repair any issue with your audio equipment, ensuring that your sound quality is restored to its optimal level
  • Comprehensive Audio Restoration: We offer restoration services for vintage and older audio equipment, helping to bring back the rich, warm sound that Hi end Audio is known for.
  • Amplifier Repair: If your Marantz amplifier is malfunctioning or needs repair, trust us to get it working like new again. We have experience repairing all types of amplifiers.
  • Professional Receiver Repair: Our technicians have the expertise to diagnose and repair all types of Marantz receivers, from vintage to modern models, so you can enjoy your music again.
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Audio Repair
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  • Anthom
  • Marantz
  • NAD
  • Rotel
  • Intergra
  • Yamaha
Brands
  • Audio Research
  • Intergra
  • Denon
  • Onkyo
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You were told that your Classic Mcintosh is not repairabl We say it is

Mcintosh Audio Repair Services

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General Repair Procedures for McIntosh

  1. Initial Assessment
  • Power On Test: Plug in the unit and check if it powers on. Look for unresponsive controls, random actions (e.g., powering on/off by itself), or no sound output.
  • Visual Inspection:Open the unit (unplug it first!) and inspect for burnt components, loose connections, or leaking capacitors. The MAC4300V uses solid-state electronics, so focus on the circuit boards and power supply.
  • Remote Check:Test the remote with fresh batteries. Point it at the receiver’s IR sensor and press buttons (e.g., volume, power). If it doesn’t respond, the issue could be the remote, the IR sensor, or the receiver’s control circuitry.
  • Symptoms:
  • Procedure:
  1. Clean Switches:Remove the front panel (unscrew the top cover and sides—wood panels may need care to avoid damage). Use DeoxIT or similar contact cleaner on pushbutton switches. Apply sparingly, work the buttons, and let dry.
  2. Inspect Wiring:Check ribbon cables or connectors to the control board for looseness or corrosion.
  3. Test:Reassemble and test each button. If some still fail, a logic IC might be faulty (see Logic Faults below).
  1. Power Supply Check
  • Symptoms: Unit won’t power on, or intermittent power.
  • Procedure:
  1. Fuse Check: Inspect the rear fuse. Replace if blown with the exact rating (likely 3-5A, check manual).
  2. Capacitor Inspection: Look for bulging or leaking electrolytic capacitors in the power supply. Replace with high-quality equivalents (same voltage/capacitance).
  3. Voltage Test: Measure rail voltages with a multimeter (e.g., ±35V for amp section) against specs.
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  1. Speaker Output Problems
  • Symptoms: Intermittent or noisy sound, one channel dead.
  • Procedure
  1. Relay Cleaning MAC4300V uses speaker relays that can wear out. Locate them (typically near the output terminals), disassemble, and clean contacts with fine sandpaper or contact cleaner. Test continuity with a multimeter.
  2. Relay Replacement:If cleaning fails, replace with compatible relays (specs in the service manual).
  3. Output Test:Connect test speakers and play audio. Check both channels at various volumes. If still noisy, inspect output transistors or capacitors in the amp section.
  1. Tuner Alignment (FM/AM)
  • Symptoms: Poor reception, stations drifting, or no auto-tuning.
  • Procedure:
  1. Tools Needed: AM/FM signal generator (e.g., Panasonic 8122), oscilloscope, and non-metallic tuning tools.
  2. Access Tuner Section: Open the unit and locate the tuner board (refer to the service manual for layout).
  3. FM Alignment:
  1. AM Alignment: Inject a 1000 kHz signal, adjust AM IF and oscillator trimmers for peak output.
  2. Test: Verify with real stations. Auto-tuning issues might also tie to front panel switch problems.
  1. Logic Faults
  • Symptoms: Audio input stuck on, lockout function always on, or random behavior.
  • Procedure:
  • Identify ICs: Faulty logic devices (e.g., input selectors or control chips) are culprits. You’ll need the schematic to pinpoint them.
  • Test/Replacement: Use a multimeter to check IC pin voltages against expected values (service manual data). Replace suspect ICs with exact matches—common ones might be TTL or CMOS logic chips.
  • Re-seat Connections: Loose socketed ICs can cause issues; reseat them carefully.

Mcintosh Products That We Repair

  • Receivers
  • Turntable
  • Amplifiers
  • Cassette Tape
  • Turntable
  • Radio
  • Mixers
  • Mcintosh
  • MR77 - MR78
  • MR80 - MR85
  • MR87 - MR88
  • MR88_own
  • MR89
  • MS300
  • MS750
  • MSD4
  • MSE1
  • MSS630
  • MT10
  • MVP841
  • VP1000
  • VP1000_own
  • WK2_own
  • WK3-WK4
  • WS320-RK320
  • WS320WS350
  • MXA60
  • TM1
  • UR12
  • WS320-RK320
  • WS320WS350
  • Mcintosh
  • MVP861
  • MVP871
  • MVP881
  • XLS360XL
  • MVP851_bro
  • MVP891
  • MX132_own
  • PC3
  • PS112
  • R649
  • RCT1
  • RCT3
  • RCT4
  • RCT4
  • SCR2
  • UR12
  • XCS1K
  • XCS2K
  • XLS
  • XR200
  • XR27
  • MXA60
  • XLS112
  • MAC7200
  • Mcintosh
  • WS350
  • XRT1K
  • XRT28
  • XRT29
  • XRT2K
  • XRT30
  • MVS3
  • MX110
  • MX112
  • MX113
  • MX114
  • MX115
  • MX117
  • MX118
  • MX119
  • MX120
  • MX121
  • MX130
  • MX132
  • VP1000
  • VP1000_own
  • WK2_own
  • WK3-WK4
  • Final Testing
  • After repairs, run the unit with speakers at low volume for 30 minutes, then test all functions: inputs (phono, CD, etc.), tuner, remote, and EQ controls. Monitor for overheating or odd behavior.
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McIntosh Receivers Capacitor Replacement

McIntosh Receiver Model Approximate Number of Capacitors to Replace Notes
MAC 1700 ~30–40 Includes electrolytic capacitors across power supply, preamp, and amplifier boards. Three multi-section can capacitors (part #066-093) contain multiple sections (e.g., 200µF/500µF). Each can may require replacing with individual capacitors or a rebuild kit.
MAC 1900 ~40–50 Full recap includes power supply, preamp, and main amplifier boards. Typically involves replacing all electrolytic capacitors. Exact count depends on whether signal path film capacitors are also replaced.
MAC 4100 ~80-100+ Similar to MAC 4100 in complexity.
MAC 4200 ~90-110+ Includes electrolytic capacitors on power supply, preamp, and power amp boards. Also involves replacing RCA jack capacitors and potentially others for optimal performance.
MAC 4275 ~90-110+ Solid-state receiver, expect a high number of electrolytics throughout the various stages
MAC 4300V ~100-120+ A very full-featured receiver with video switching capabilities, indicating a high component count. This complexity translates to a substantial number of electrolytic capacitors requiring replacement for a comprehensive restoration.
MAC 5200 ~100-120+ While a more modern design compared to the 70s units, it's still vintage and will contain a considerable number of electrolytic capacitors, especially in the power supply and audio sections.
MAC 6700 Fewer required than vintage units (typically focus on power supply) This is a much newer, modern solid-state unit. Capacitors are generally more reliable, but long-term heavy use can still necessitate some replacements, primarily in the power supply section. Full "shotgun" recaps are less common than on older vintage units.
MAC 7200 Fewer required than vintage units (typically focus on power supply) Similar to the MAC 6700, being a contemporary model. Electrolytic capacitor issues are less prevalent than in units from the 70s and 80s, but still possible with very long-term use, particularly in critical power supply filtering.
MA6100 ~40–50 Full rebuild involves replacing all electrolytic capacitors across power supply and audio boards. Can capacitors may be retained if still in spec, but small signal capacitors are often replaced.
C28 (Preamp) ~30–40 As a preamp, it has fewer capacitors than integrated receivers but requires a full recap of power supply and audio boards for restoration. Buzzing issues often point to power supply caps.
MQ102 (Equalizer) ~20–30 Recap kit focuses on electrolytic capacitors. Exact count depends on the specific board configuration, but typically fewer than full receivers.
MA-5100 (Solid-State) 30–40 Early SS, prone to leaky caps
MA-6100 35–45 Includes small electrolytics in signal path
MAC-1700 25–35 Fewer caps than later models
MAC-1900 30–40 Similar to 1700 but more complex
MAC-4100 40–50 More advanced, additional circuits
MAC-4200 45–55 Higher part count than 4100
MAC-4300 50–60 Complex tuner & amp sections
MA-6200 40–50 More filtering & protection circuits
MA-6900 60–70 High-end integrated, many small caps
Model Capacitor Count
C22 10-15 Power supply, signal path, and tone controls
MC2100 14-16 8-10 x 1000uF/50V, 2-4 x 100uF/100V, 2 x 10uF/63V
MC2105 16-18 10-12 x 1000uF/50V, 2-4 x 100uF/100V, 2 x 10uF/63V
MC2300 18-20 12-14 x 1000uF/50V, 4 x 100uF/100V, 2 x 10uF/63V
MC250 10-12 6-8 x 1000uF/50V, 2 x 100uF/100V, 2 x 10uF/63V
MC2505 12-14 8-10 x 1000uF/50V, 2 x 100uF/100V, 2 x 10uF/63V
MC275 14-16 8-10 x 2000uF/50V, 2-4 x 100uF/100V, 2 x 10uF/63V
MC275 V 16-18 10-12 x 2000uF/50V, 2-4 x 100uF/100V, 2 x 10uF/63V
MAC4100 15-18 Power supply, signal path, and tone controls
MA6200 20-25 Power supply, signal path, and tone controls
MC7205 20-22 12-14 x 1000uF/50V, 4 x 100uF/100V, 2-4 x 10uF/63V
MC7300 18-20 10-12 x 2000uF/50V, 4 x 100uF/100V, 2-4 x 10uF/63V

Notes and Considerations

  • Electrolytic Capacitors: The counts above primarily refer to electrolytic capacitors, as these are prone to aging and failure (e.g., leaking or high ESR). Some restorations also replace film or Mylar capacitors, which may increase the count slightly.
  • Multi-Section Can Capacitors: Models like the MAC 1700 and MC2100/MC2105/MC2300 use multi-section can capacitors (e.g., part #066-095), where a single can contains multiple capacitor values. These can be replaced with individual capacitors or a rebuild kit.
  • Model-Specific Variations: Capacitor counts can vary due to revisions in manufacturing or optional upgrades. Always refer to the service manual or inspect the unit for accuracy.
  • Restoration Kits: Many vendors offer model-specific recap kits with high-quality capacitors (e.g., Nichicon, WIMA). These kits typically include detailed instructions.
  • Safety: Always discharge capacitors before working on the unit, especially large filter capacitors, to avoid shock. Use a multimeter to confirm voltage is below 12V.

General Repair Tips for the Marantz Model 2235 - 2235B

The Marantz Model 2235 2235B is a classic receiver that was first introduced in the 1970s. It is known for its high-quality sound and durability, but like any electronic device, it can experience issues over time. Here are some general repair tips for the Marantz Model 2235:

Power Issues (Won’t Turn On)

  1. Check the Fuse:
    2. Start by inspecting the AC line fuse on the back of the unit. If it’s blown, replace it with one of the same rating (typically listed in the service manual or near the fuse holder). A blown fuse could indicate a deeper issue, like a shorted power supply component.

Sound Issues (Distortion, No Sound, etc.)

  1. Check Connections:
    2. Ensure all speaker and input connections are secure. Loose connections can cause sound issues.
  2. Inspect the Speaker Protection Relay:
    3. The speaker protection relay can sometimes fail, causing no sound or distortion. Listen for a clicking sound when the unit is powered on. If you don’t hear it, the relay may need to be replaced.
  3. Clean the Controls:
    4. Dirty or oxidized controls (volume, balance, etc.) can cause distortion or intermittent sound. Use a contact cleaner to clean these controls.

Power Supply Caps:

  1. Power Supply Caps:The large electrolytic capacitors in the power supply (often C801/C802 on the P800 board) degrade over time. If the unit hums or doesn’t power up reliably, consider replacing these with high-quality equivalents (e.g., Nichicon or Panasonic caps). Look for bulging or leaking caps as a visual clue.
  2. Check Switch:These can get dirty or worn. Spray some contact cleaner (like DeoxIT) into the switch and toggle it several times to clean the contacts.

One Channel Silent or Weak

  1. Preamp vs. Power Amp Test: Use the “Pre Out” and “Main In” jacks on the back. Connect the Pre Out to another amp’s input. If both channels work, the issue is in the power amp section. If one channel is still dead, it’s likely the preamp or earlier stages.

Sound Issues

Speaker Protection Circuit

  1. Check the Relay: The speaker protection relay can fail, causing no sound or distortion. Listen for a clicking sound when the unit is powered on. If you don’t hear it, the relay may need to be replaced.
  2. Inspect the Circuit: If the relay is fine, inspect the speaker protection circuit for shorts or open connections.
  3. Replace the Relay: These models have a speaker protection relay that can wear out over time. A failing relay may prevent the speakers from activating or cause intermittent connection issues. You can clean or replace the relay if necessary.
  4. Test the Circuit: After replacing the relay, test the speaker protection circuit by connecting speakers and playing audio. If still noisy, inspect output transistors or capacitors in the amp section.
  5. Output Test: Connect test speakers and play audio. Check both channels at various volumes. If still noisy, inspect output transistors or capacitors in the amp section.
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