< TUNER SECTION >< FRONT SECTION >
1. Clock frequency Check10.m-CON OSC Adjustment
Settings : Y Test point : TP2 (CLK)Settings : Y Test point : TP10 and GND
Method : Set to MW 1602kHz and check that the test point isY Adjustment location : L951
2052kHz ? 45Hz.Method : Insert AC plug with pressing of DISPLAY key. Adjust
L951 so that the frequency across the test point is
2. MW VT Check184.94Hz ? 0.18Hz.
Settings : Y Test point : TP1 (VT)
Method : Set to MW 1602kHz, 531kHz and check that the test
point is less than 8.0V (1602kHz) and more than<DECK SECTION > 0.6V
(531kHz).
11. Tape Speed Adjustment (DECK 2)
3. LW VT AdjustmentSettings : Y Test tape : TTA�100
Settings : Y Test point : TP1(VT)Y Test point : TP8(Lch), TP9(Rch)
Y Adjustment location :Y Adjustment location : SFR1
L942 ...............................................Method :144 kHzPlay back the test tape and adjust SFR1 so that the
TC942 ............................................290 kHzfrequency counter reads 3000Hz ? 5Hz and ? 45Hz
Method : Set to LW 144 kHz and adjust L942 so that the test point(REV) with respect to forward speed.
becomes 1.3V ? 0.05V. Then set to LW 290 kHz and
check that the test point is less than 8.0V.12. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : Y Test tape : TTA�330
4. FM VT CheckY Test point : TP8(Lch), TP9(Rch)
Settings : Y Test point : TP1 (VT)Y Adjustment location : Head azimuth
Method : Set to FM 87.5MHz, 108.0MHz and check that the testadjustment screw
point is more than 0.5V (87.5MHz) and less than 8.0VMethod : Play back (FWD) the 8kHz signal of the test tape and
(108.0MHz).adjust screw so that the output becomes maximum.
Next, perform on REV PLAY mode.
5. MW Tracking Adjustment
Settings : Y Test point : TP8(Lch), TP9(Rch)13. PB Frequency Response Check (DECK 1, DECK 2)
Y Adjustment location :Settings : Y Test tape : TTA�330
L951(1/3) .......................................999 kHzY Test point :TP8(Lch), TP9(Rch)
Method : Set to MW 999 kHz and adjust L951(1/3) to MAX.Method : Play back the 315Hz and 8kHz signals of the test tape
and check that the output ratio of the 8kHz signal with
6. LW Tracking Adjustmentrespect to that of the 315Hz signal is within 5dB.
Settings : Y Test point : TP8(Lch), TP9(Rch)
Y Adjustment location :14. PB Sensitivity Check (DECK 1, DECK 2)
L941 ...............................................Settings :144 kHzY Test tape : TTA�200
TC942 ............................................290 kHzY Test point : TP8(Lch), TP9(Rch)
Method : Set up TC942 to center before adjustment. The level atMethod : Play back the test tape and check that the output level of
144 kHz is adjusted to MAX by L941. Then the level atthe test point is 110mV ? 3dB.
290 kHz is adjusted to MAX by TC942.
15. REC/PB Frequency Response Adjustment (DECK 2)
Settings : Y Test tape : TTA�602
Y Test point : TP8(Lch), TP9(Rch)7. FM Tracking Check
Settings : Y Test point : TP8(Lch), TP9(Rch)Y Input signal : 1kHz / 8kHz (LINE IN)
Method : Set to FM 98.0MHz and check that the test point is lessY Adjustment location : SFR451 (Lch)
than 13dBmV.SFR452 (Rch)
Method : Apply a 1kHz signal and REC mode. Then adjust
8. AM IF AdjustmentOSC attenuator so that the output level at the TP8,
Settings : Y Test point : TP8(Lch), TP9(Rch)TP9 becomes -20VU. Record and play back the 1kHz
Y Adjustment location :and 8kHz signals and adjust SFRs so that the output of
L802 ...............................................999 kHzthe 8kHz signals becomes 0dB ? 0.5dB with respect to
Method : Set to AM 98.0MHz and adjust L802 so that the outputthat of the 1kHz signal.
at the test point becomes maximum.
16. REC/PB Sensitivity Check (DECK 2)
Settings : Y Test tape : TTA�6029. DC Balance / Mono Distortion Adjustment
Y Test point : TP8(Lch), TP9(Rch)
Y Input signal : 1kHz (LINE IN)Settings : Y Test point : TP3, TP4 (DC Balance)
Y Adjustment location : L801
Method : Apply a 1kHz signal and REC mode. Then adjustY Input level : 60dBmV
OSC attenuator so that the output level at TP8, TP9Method : Set to FM 98.0MHz and adjust L801 so that the
becomes 0VU. Record and play back the 1kHz signals
and check that the output is -1dB ? 3.5dB.voltage between TP3 and TP4 becomes 0V ? 300mV.
Next, check that the distortion is less than 1.3%.
� 25 � |
ACEC
