Technics RS-M250

toa" P4010)
ITEM MEASUREMENT & ADJUSTMENT
6. At this time, LINE OUT level indicates
0.07 V.
7. Record each frequency 30 Hz, 100Hz, kHz
1kHz, 4kHz, 8kHz, 10kHz, 12 kHz,
and 13kHz (14kHz for CrO2 and =
Fe-Cr, 16kHz for Metal). LSkH2 _ SkHz 10kHz|
8. Playback and express in dB the :
difference between playback output
level of each frequency based on
playback output level of 1 kHz.
9. Make sure that the measured value is Fig. 18
within the range specified in the overall
frequency response chart (shown infig.
15).
10. Change test tape to Metal (QZZCRZ),
CrOz2 (QZZCRX) and Fe-Cr (QZZCRY).
11. Set the tape selector to each position.
12. Measure as same as manner above.
13. Make sure that the measured value is within the range specified in the overail frequency response
chart for Fe-Cr, CrOz and Metal tape shown in fig. 17 and 18.
14. If measured value is not within standard, adjust C109 (L-CH), C110 (R-CH)
Overall frequency response chart (Fe-Cr)
@ Dolby NR circuit
Condition:
* Record mode
* Input level controls --- MAX
* Output level control --- MAX
Equipment:
*VTVM * AF oscillator
* ATT * Oscilloscope
* Resistor (600 Q)
1. Test equipment connection is shown in fig. 19.
2. Place UNIT into record mode, set the Dolby NR
switch to OUT position and supply to LINE IN to
obtain —34.5dB at TP5 (L-CH), TP6 (R-CH)
(frequency 5kHz).
3. Confirm that the value at IN position is 8(+ 2.5) dB
greater than the value at OUT position of Dolby
NR switch.
TPS (L-CH}
TP6(R-CH)
1€3 (L-CH)
14 (R-CH)
VTVM
ATT Record mode
Fig. 19
AF oscillator
OSC VSS
VDD C011
DO7 C010
DO6 Cog
DO5 C08
DO4 C07
DO3 C06
DO2 C05
DO1 co04
DO¢ C03
SNS1 Cco2
SNS¢@ Col
CSLCT CO¢
RST Al3
TST Al2
E03 All
E02 Ald
E01 BI3
E0¢ BI2
Bl¢ Bl1