We repair Tascam

TASCAM 58 Reel-to-Reel Tape Deck Repair Guide

Model Overview

The TASCAM 58 is a professional 1/2" 8-track reel-to-reel tape deck that was part of TASCAM's Series 50 lineup. It was designed as a step-up from the TASCAM 38 with improved specifications and build quality. The 58 features a three-motor transport system, dual-capstan drive, and advanced electronics for its time.

Common Issues and Solutions

Transport Mechanism Problems

The TASCAM 58 features a sophisticated transport system that can develop specific issues:

• Pinch roller mechanism: The engagement mechanism can become stiff or fail to engage properly
• Capstan motor issues: The DC servo capstan motor can develop speed stability issues or fail completely
• Brake system wear: Brake bands can wear out or become glazed, affecting stopping accuracy
• Tension sensor problems: The infrared tension sensors can become dirty or misaligned

Electronic Issues

Common electrical problems include:

• Capacitor failure: Electrolytic capacitors dry out, causing various issues including noise and power supply problems
• Relay contact problems: Oxidized contacts cause intermittent operation or channel dropouts
• Power supply issues: Failed regulators or diodes cause incorrect voltages
• DBX board issues: If equipped, the DBX noise reduction cards can develop problems
• Memory backup battery: The CMOS battery for memory backup can leak and damage the circuit board

Capacitor Replacement Guide

The following capacitors should be replaced in any comprehensive restoration:

Critical Components to Check/Replace

Component	Reference	Location	Notes
Voltage Regulators	IC1, IC2	Power Supply	Check for proper output voltages (+24V, +15V, -15V)
Relays	RLY1, RLY2	Control Board	Clean or replace oxidized contacts
Capstan Motor	M1	Transport	Check and replace if speed unstable
Tension Sensors	PS1, PS2	Transport	Clean infrared sensors and check alignment
Memory Backup Battery	BAT1	System Control Board	Check for leakage and replace if necessary

Mechanical Maintenance Procedure

1. Disconnect power and remove covers
2. Carefully clean the transport mechanism with isopropyl alcohol
3. Inspect and replace worn brake bands if necessary
4. Remove old hardened lubricant from all moving parts
5. Apply fresh lubricant to appropriate areas:
   • Capstan bearing: Light machine oil
   • Guide rods: Light grease
   • Levers and pivots: Light machine oil
6. Clean and inspect the pinch roller; replace if hardened or cracked
7. Check and adjust tape tension as needed
8. Clean all switches and potentiometers with contact cleaner
9. Clean tension sensors with isopropyl alcohol
10. Lubricate the solenoid mechanism

Calibration Procedure

After capacitor replacement, these calibrations are essential:

• Set playback level and EQ using MRL calibration tape
• Adjust record level and bias for each tape type
• Check and adjust tape tension
• Verify tape speed accuracy (7.5 and 15 ips)
• Adjust head azimuth for proper high-frequency response
• Calibrate reproduce and record electronics for all channels
• Set proper brake tension for smooth operation
• If equipped, calibrate DBX noise reduction system

Additional Tips

• Use high-quality, low-ESR capacitors for longer life
• Document all adjustments before making changes
• Check all resistors near replaced components; they may have drifted in value
• Clean the record/playback switches thoroughly as they often cause noise
• Allow the unit to warm up for 30 minutes before making final adjustments
• Consider replacing relay contacts if they show signs of pitting or oxidation
• Check the memory backup battery for leakage and replace if necessary
• If DBX cards are installed, check for leaking capacitors on those as well