Technics RS-D225W Service Manual page 14

4 (Mechanism (1))
3 (Mechanism (2))
al Tape Speed Adj.
"3
PN1 (Mechanism (1))
PN2 (Mechanism (2))
1), (2) P.C.B.
er are clean.
> (68 +9°F)
|B); QZZCFM
Jain adjustment
RA
villoscope
Digital frequency
counter
man li i 1 a
63Hz toonz 1 315Hz TkHZ 2kHZ2 4kHZ 8kHz 12.5kHz
Fig. 5 200Hz2 ©500Hz
Fig. 4
Overall frequency response (TAPE [2))
1. Test equipment connection is shown in Fig. 6, and connect a
jumper of TP6. (See page 9).
6. After adjustment, cut a jumper of TP6.
Input Point
+60B --|+60B 4+60B ere
+4dB
4+4dB +4dB
+4dB
+208
ond js +2qB
+2dB
008
0aB 00B
008
—2dB
+ — | ~ 20B —20B
—~20B
~40B Hy t+
! ea}, 908 — 4B Pred
{48
se} P——t 4 - + r++
4-648 ~ 648) — ep Hl ~t-4
+H 14-608
Leitii
a Ss i ittiot:
r i tisi i _ pe ee rll
50Hz 100Hz 200Hz SOOHz tkHz 2kHz
4kHz 10kHz 50Hz
100Hz 200Hz 500Hz 1kHz 2kHz 4kHz 8kHz 12.5kHz
Fig. 7
Fig. 8
Overall gain adjustment (TAPE [2))
. Adjust the output 0.4V by attenuator and then record.
6. After adjustment, cut a jumper of TPS.
Ot w p=
vt 0.1
—o.08 | Standard value: 0.4
Dolby NR circuit
1. Test equipment connection is shown in Fig 9.
2. Set a normal tape and apply 5kHz signal in record pause
mode.
3. Adjust by attenuator so that the output between terminal ©
(L-CH) {terminal @ (R-CH)} of 1C401 and ground is 12.3mV.
specified from the level in NR out mode.
Standard value: 8+1.5dB
Terminal
Function/operation
—_— ¢ Connection to GND.
P.B. mute ¢"H"' in mute on, "L" in mute off.
Auto tape selector | *''H" in 70S mode, "L" in 120uS mode.
——+
Bias | °"H"' in bias off, "L" in bias on.
Direct muting | ¢"H" in mute off, "'L" in mute on.
— ¢ Non connection.
[1] auto tape
selector (S909) TOM
OV
|
1] motor (S904)
+5V
OV
(1] FF/REW (S906)
OV
(1) PLAY ($902)
OV
DO® output - "L'...... Reading of REC switch.
Rec/on
. a ae OV
DO1 output > "L"'...... Reading of PLAY switch.
Play/on
7 eee
Reading of input *"H" When editing switch is on mode. .
switch state eee
editing (S802)
editing/on
eer