Mitsubishi Electric HS-U449 Service Manual page 45

3-2-6. Tape Running Condition
at the GUIDE ROLLERs (Check 1)
1. Play back an Alignment Tape.
[NM6KE2: 859C339O90]
2. Check visually that there is a space between the tape
and the lower flange of the GUIDE ROLLER (SP) and
the GUIDE ROLLER (TU).
3. If no space is confirmed, replace the TAPE GUIDE
ASSY (SP) and the TAPE GUIDE ASSY (TU) in
accordance with "2-32. TAPE GUIDE ASSY (SP),
TAPE GUIDE ASSY (TU)."
4. Repeat loading and unloading the tape several times
and make sure that the FM waveform remains flat.
5. If flatness of the FM waveform varies, check the
position of the A/C HEAD. If the A/C HEAD UNIT is
incorrectly installed, reinstall it referring to "2-8. A/C
HEAD UNIT" and perform "3-2-4. Coarse Adjustment
of Phase."
3-2-7. Tape Running Condition
at the GUIDE ROLLERs (Check 2)
1. Play back an alignment tape (NM6KE2 : 859C339O90).
2. Make sure that the FM waveform is restored to the
previous level immediately after the tops of the GUIDE
ROLLER (SP) and the GUIDE ROLLER (TU) are
pressed lightly and then released.
3. If the FM waveform isn't restored immediately, replace
the TAPE GUIDE ASSY (SP) and the TAPE GUIDE
ASSY (TU) in accordance with "2-32. TAPE GUIDE
ASSY (SP), TAPE GUIDE ASSY (TU)."
Tape
Lower FLANGE of GUIDE ROLLER
- 32 -
GUIDE ROLLER
Fig. 3-2-6