AIWA HS-SP170W
Service Manual

ADJUSTMENT
CHIP RESISTOR PART CODE Chip Resistor Part Coding

A MAIN C.B
2 3 5 4 3 5 1 8 7 L201 BAR ANT

88
A
Figure Resistor Code Value of resistor Chip resistor
Dimensions

L203 L205 TC204 TC202 TC205 TC201 L202

R55 R56 A B C

R54 SFR101

Wattage 1/16W 1/10W 1/8W

Type

Tolerance

Symbol

Form L W t

L
1.6 2 3.2

W
0.8

t
0.45

Resistor
108 118 128

:A :A
L204 PHONES 4 J101

PVC201

1608 2125 3216

5% 5% 5%

CJ CJ CJ

1.25 0.45 1.6 0.55

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6 7. Tape speed adjustment Settings : �Test tape : TTA-100 (TAPE CENTER) �Test point : PHONES JACK (J101) �Adjustment location : SFR101 Method : Play back the test tape and adjust for 3015 ± 10 Hz. 8. GOVERNOR Adjustment Perform the STOP PLAY and REVERSE operations(or PAUSE ON OFF) after the motor is replaced. When the tape starts running smooth, this adjustment is not necessary. If wow is conspicuous at the beginning of the tape-run, perform this adjustment following the procedure below. 1) Solder only medium resistor pattern (B) of the MOTOR AND GOVERNOR MATCHING ADJ. resistor group. 2) Set the tape speed (using speed adjustment SFR). 3) Restrict the motor rotation by hand (or turn PAUSE ON). 4) Remove your hand and listen to the begining of the taperun. 5) When the rise of tape running is smooth, no more adjustment is necessary. If wow continues for 1 to 2 seconds at the rise time, change the combined resistance according to procedure 6 and check that the tape starts running smooth. 6) Solder the resistor pattern according to the table below. Pattern High resistance(C) Medium resistance(B) Low resistance(A) (Procedure 1 above) Open Solder Solder Step(1) Open Open Solder Step(2) Solder Open Solder Step(3) Solder Solder Solder

TRANSISTOR ILLUSTRATION

<RADIO SECTION>

1. AM IF Adjustment L205........................................................... 450kHz 2. AM Frequency Range Adjustment L204............................................... 515kHz ± 5kHz <EXCEPT YU> 517kHz ± 5kHz <YU> TC205.......................................... 1635kHz ± 10kHz <EXCEPT YU> 1750kHz ± 10kHz <YU> 3. FM Frequency Range Adjustment L203................................................87.4MHz ± 0.1MHz <EXCEPT YU> 87.0MHz ± 0.1MHz <YU> TC204............................................ 108.3MHz ± 0.1MHz <EXCEPT YU> 109.0MHz ± 0.1MHz <YU>

C

B

E

2SA1362 DTC143 RN1407 RN1411 RN2407

PRACTICAL SERVICE FIGURE
<RADIO SECTION>
Sensitivity : (IHF, THD 3%) FM Less than 16dB (88/98MHz) Less than 17dB (108MHz) (S/N 10dB) AM Less than 52dB (600kHz) Less than 51dB (1000/1440kHz) Intermediate frequency: FM 10.7MHz ± 0.1MHz AM 455kHz ± 3kHz FM stereo separation : FM More than 15dB (98MHz)

<TAPE SECTION>
Tape section : Wow & flutter : Take-up torque : F.F torque : REW torque : S/N ratio : Distortion : Noise level : Frequency response : 3015Hz ± 40Hz Less than 0.55% 60g-cm(FWD) 27~60g-cm More than 55g-cm More than 43dB (PB) Less than 3.0% (PB) Less than 3.5mV (Vol MAX, PB) 63Hz +2/� 6dB ~ 8kHz + 4/�6dB (NORMAL) 63Hz +2/� 6dB ~ 10kHz + 4/�6dB (CrO2, METAL)

4. AM Tracking Adjustment L201 ......................................................................... 600kHz TC201 .................................................................... 1400kHz 5. FM Tracking Adjustment L202......................................................................88MHz TC202.................................................................108MHz <TAPE PLAYER SECTION> 6. Azimuth Adjustment Settings : �Test tape : TTA-320 (TTA-3.30) �Test point : PHONES JACK (J101) �S-BASS : OFF �TAPE SELECTOR : NORMAL �VOLUME : MAX �Adjustment location : Azimuth adjustment screw Method : Play back the 8kHz signal of the test tape and adjust so that the output becomes maximum.

7) Finally re-check the tape speed. Caution: Cool the patterns down to normal temperature after soldering. If the pattern remains heated, the governor circuit does not operate normally.

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