Aiwa XR-HG2MDK Service Manual page 29

< DECK SECTION >
1. Tape Speed Adjustment
Settings : • Test tape : TTA–100
• Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location : SFR601
Method : Play back (FWD) the test tape and adjust SFR601 so
that the frequency counter reads 3000Hz ± 5Hz and
± 45Hz (REV) with respect to forward speed.
2. Head Azimuth Adjustment (Deck 1, 2)
Settings : • Test tape : TTA–300
• Test point : TP8 (Lch), TP9 (Rch)
• Adjustment location : Head azimuth
Method : Play back (FWD) the 8kHz signal of the test tape
and adjust screw so that the output becomes
maximum.
3. PB Frequency Response Check (Deck 1, 2)
Settings : • Test tape : TTA–330
• Test point :TP8 (Lch), TP9 (Rch)
Method : Play back the 315Hz and 8kHz signals of the test
tape and check that the output ratio of the 8kHz
signal with respect to that of the 315Hz signal is
0dB ± 4dB.
4. REC/PB Frequency Response Check (Deck 2)
Settings : • Test tape : TTA–602
• Test point : TP8 (Lch), TP9 (Rch)
• Input signal : 1kHz / 8kHz (-20Vu)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP8,
TP9 becomes 46mV. Record and play back the 1kHz
and 8kHz signals and check that the output of the
8kHz signals is 0dB ± 5dB with respect to that of the
1kHz signal.
5. REC/PB Sensitivity Check
Settings : • Test tape : TTA–602
• Test point : TP8 (Lch), TP9 (Rch)
• Input signal : 1kHz (0Vu)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at TP8, TP9
becomes 460mV. Record and play back the 1kHz
signals and check that the output is -1dB ± 3.5dB.
adjustment screw
< FRONT SECTION >
6. µ-CON CLOCK Adjustment
Settings : • Test point : TP5 (CLK), TP2 (GND)
• Adjustment location : L201
Method : Connect a frequency counter to TP2 and TP5. Adjust
L201 so that the frequency across the test point
becomes 247.76Hz ± 0.24Hz.
– 29 –