Aiwa Z-L720U Service Manual page 28

< DECK SECTION >
10. Tape Speed Adjustment (DECK 2)
Settings : • Test tape :
• Test point :
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 so that the
frequency counter reads 3000 Hz ± 5 Hz (FWD) and FWD
speed ± 45 Hz (REV) with respect to forward speed.
11. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : • Test tape :
• Test point :
• Adjustment location : Head azimuth
Method : Play back (FWD) the 8 kHz signal of the test tape and
adjust screw so that the output becomes maximum.
Next, perform on REV PLAY mode.
12. PB Frequency Response Check (DECK 1, DECK 2)
Settings : • Test tape :
• Test point :
Method : Play back the 315 Hz and 8 kHz signals of the test tape
and check that the output ratio of the 8 kHz signal with
respect to that of the 315 Hz signal is within 5dB.
13. PB Sensitivity Check (DECK 1, DECK 2)
Settings : • Test tape :
• Test point :
Method : Play back the test tape and check that the output level of the
test point is 140 mV ± 3dB.
14. REC/PB Frequency Response Adjustment (DECK 2)
Settings : • Test tape :
• Test point :
• Input signal :
• Adjustment location : SFR451 (Lch)
Method : Apply a 1 kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP8,
TP9 becomes 0dB (10 mV). Record and play back the
1 kHz and 8 kHz signals and adjust SFRs so that the output
of the 8 kHz signals becomes 0dB ± 1dB with respect to
that of the 1 kHz signal.
TTA–100
TP8(Lch), TP9(Rch)
TTA–330
TP8(Lch), TP9(Rch)
adjustment screw
TTA–330
TP8(Lch), TP9(Rch)
TTA–200
TP8(Lch), TP9(Rch)
TTA–602
TP8(Lch), TP9(Rch)
1 kHz / 8 kHz (LINE IN)
(-20VU)
SFR452 (Rch)
15. REC/PB Sensitivity Check (DECK 2)
Settings : • Test tape :
• Test point :
• Input signal :
Method : Apply a 1 kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at TP8, TP9
becomes 0dB (100 mV). Record and play back the
1 kHz signals and check that the output is -1dB ± 3.5dB.
< FRONT SECTION >
16. µ-CON OSC Adjustment
Settings : • Test point :
• Adjustment location : L101
Method : Insert AC plug while pressing POWER key and TUNER
function key. Connect a frequency counter across TP10
and TP11. Then adjust L101 so that the frequency at the
test point is 208.80 Hz ± 0.21 Hz.
[Manual Reset]
Make up for RESET after adjustment.
* Reset is to press POWER key while pressing CLEAR
(STOP) key.
– 28 –
TTA–602
TP8(Lch), TP9(Rch)
1 kHz (LINE IN) (OVU)
TP10 (KEYSCAN)
TP11 (D-GND)