3
3. TEST EQUIPMENT REQUIRED FOR SERVICING
For measuring or checking a Cassette Deck, the following
instruments and materials are necessary.
• Audio Oscillator (Audio Signal Generator)
• Attenuator (600 ohm)
• Audio Noise Meter
• Oscilloscope
• Wow and Flutter Meter
• Torque Meter (Cassette Type)
• Digital Frequency Counter
• Test Tape
TCC-112/MTT-111 Wow/Flutter, Tape Speed
TCC-120/MTT-212N Signal-to-Noise Ratio
TCC-130/MTT-150 Dolby Level Adjustment
TCC-174A/MTT-255M Azimuth Adjustment
(TCC-
****
:A-BEX/MTT-
****
:TEAC)
• Blank Tapes (Completely erased with bulk eraser)
AC-225 (Normal)
AC-514 (High Position)
AC-713 (Metal)
NOTE:
If any doubt is noted in a measured value, which is due to a
tape. Re-measurement is necessary by use the new tape.
• Mirror cassette 12um padless
TCC-902/MTT-902 Tape fl owing check
• Head guide gauge (M-300)
THG-801
4. ELECTRICAL ADJUSTMENTS
(A) Remark for adjustment
1) Clean and de-magnetize the tape path part before
measurement.
2) Keep cassette tapes away from equipments.
3) De-magnetize tools often.
4) Do not turn adjustment parts by strong force.
5) Keep a cassette deck horizontally while measuring.
6) Keep amount of glue in proper.
7) Confi rm the mains voltage, output level of oscillator and
etc. before adjustment and measurement.
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