Aiwa tpr-940 Service Manual

MULTI-BAND RADIO STEREO

CASSETTE RECORDER

MDDELTPR-94DEE,uK

AIW~

(SERVICE MANUAL]

Type

Circuitry

Power source

Output Powr consumption Frequency response

Speakers 120 mmq,x2,

Multiband (FM/SW/MW/LW) radio stereo cassette recorder 38 transistors, 24 diodes, 5 ICs,

1 LEO Batteries, OC 9V(UM-1 x 6)

AC 110-120V/220-240

(switchable) Car battery 5 W maximum (2.5 W+2.5 W) 12W Normal

tape:

CrO,

tape :

Tape Recorder Section

Built-in microphones

Tape speed

Recording system Erasing system

Recording time

Signal to noise ratio

Wow and flutter

Electret condenser microphones

4.8 cm/sec AC bias AC erase

90 minutes (C-90 cassette, directions)

55 dB

0.09% (WRMS)

Shown above is TPR- 940EE

SPECIFICATIONS

V

(thru

car

adapter)

40-12,000 Hz 40-15,000 Hz

70 mrno

x

both

2

Set using ISO screws

DATE OF ISSUE 25/2/1977

Radio Section

Freq uency ranges

Antennas

Dimensions

Weight

Accessor ies

The specifications and external appearance of this set are subject to change without prior notice.

FM: 87.5-108MHz

(3.43 - 2.87 rn)

SW: 5.9-18MHz

(50.9 - 16.6

MW: 525 - 1605 kHz

(571 - 187 m)

LW: 150 - 300 kHz

(2.000 - 1.000

Whip antenna for FM and SW

Ferrite bar antenna for MW and LW External antenna jack for FM 397x268x114 mm

5.1 kg (including AC power cord Cassette tape 1

Batteries (Super UM-1) 6 Head cleaning stick

m)

batteries)

MODEL TPR-940EE, UK

DISASSEMBLY INSTRUCTIONS

AIWA

1. T0Remove Cassette Lid

1) While pressing hard the arrow-indicated parts (left and right) in the directions indicated by the respective arrow marks in figure, pull out the cassettelid for removal. (Refer to Fig. 1)

Fig.1

2. To Install Cassette Lid

1) Refering to figure, align the pawls of the cassettelid properly with respective guides provided on the mechanism panel and insert them into guides securely.

2) While pressingthe parts (1) of the cassettelid in the directions indicated by the respective arrow marks, push the entire cassette lid toward the mechanism panel until it is securely installed in place. (Refer to Fig. 2)

3. To Remove Back Cover

1) Remove6 screws. (Refer to Fig. 4)

Fig.4

4. To Remove Chassis

1) Pull out the control knobs. (BASS, TREBLE, BALANCE, VOLUME and TUNING).

2) Remove 8 screws. (Refer to Fig. 5)

Fig.2

Note: Do not remove or assemblethe cassettelid by force as

the parts of the cassettelid indicated by arrows might bebroken. (Refer to Fig. 3)

Fig.3 Fig.6

Fig.5

v

5. To Remove Power Circuit Board

1) Remove2 screws. (Refer to Fig. 6)

6. To Remove Rec'/Pb Circuit Board

1) Remove4 screws. (Refer to Fig. 6)

2

AIWA

MODEL TPR-940EE, UK

7. To Remove Recorder Chassis

1) Remove3 screws. (Refer to Fig. 7)

8. To Remove Tuner Circuit Board

1) Remove4 screws. (Refer to Fig.

Tuner

8)1

9. To Remove Volume Circuit Board

1) Remove2 nuts. (Refer to Fig.9)

10. To Remove Tone Circuit Board

1) Remove4 screws. (Refer to Fig. 9)

Fig.7

Fig.9

11. To Remove Switch-2 Circuit Board

1) Remove2 screws.(Referto Fig. 10)

Switch-2 Circuit Board

<v.

U(j)3-6

Fig.8

DIAL CORD INSTALLATION

Re'movethe tuner circuit board and perform dial cord installation

asfolIows.

1) Thread.dial cord through points (1) - (11).

2) Install tuner circuit board.

3) Turn tuning shaft counter-clockwise.

4) Set the dial indicator to the dial panelreferencemark. Engage dial indicator with the cord andlock with cement.

VS(j)3-8

Fig.10

~52~5__

"71':

Align indicator with this mark.

3

MO DEL TPR-940EE, UK

ADJUSTMENTS 4. Pinch Pressure

AIWA

MECHANIOAL SECTION

1. Review Timing Adjustment

During review operation, the pinch roller and play idler should separate either simultaneously, or the pinch roller separates first.

Adjustment During play operation, depress the REW button. Adjust by bending the operating tab forward or rearward to obtain the abovetiming. (Refer to Fig. 11)

Operating tab

2. Pause Timing Adjustment

In pauseoperation, the pinch roller, play idler and leaf switch

all separate sirnultaneouslv, or the pinch roller separatesfirst.

Adjustment

During play operation, adjust by bending the operating tab

forward or rearward. (Reter to Fig. 12)

Fig.11

290±30g

5. Tape Speed Variation

±2% Usea standard test tape, TTA-111 (3kHz) or equivalent.

Wow&Flutter

6.

0.08±0.04% (WARMS) Usea standard test tape, TTA-111 (3kHz) or equivalent.

Takeup Torque

7.

+

5

50 -10 g-cm

8. Fast ForwardiRewind Torque

110±20 g-cm

9. Fast Forward Time

140±10 sec. (at C-60 tape)

10. Rewing Time

110±10 sec. (at C-60 tape)

11. Current Consumption

FWD: 115±25mA FF: 160±25mA REW: 215±30mA

(mechanism unit only)

3. Thrust Adjustment

Turn the thrust adjusting screw and adjust spacing between it and the tlywheel. (Reter to Fig. 13))

tor

0.1 - 0.2mm

v

Fig.12

Fig.13

4

ADJUSTMENTS

TAPE RECORDER SECTION

• Location of Main Parts

L201

r----,

I 171\ I I \V 1

L__

...l

_TP-4

MOOEL TPR·940EE, UK

\

r--"

i

L__

SFR302

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1171\ I

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Adjustment Item

Azimuth

Bias Osc Frequency

Bias Trap Coil

Bias Current

Recording Current

Playback Level

Meter

(Jj)

-.!

J

iL301

r

r--l

I

1171\

'\VI

,_/

CD

®

ISFR304

I

SFR303

(~--i

\\V

......_-_..1

Test Point

Ext. Sp. jaek

TP-3

Leh:

TP-4

Reh: Lch:

Tp·3 TP-4

Reh:

TP-3

Leh: Reh: TP-4 Leh: TP-1

TP-2

Reh:

TP-3

Leh: Leh: TP-4

Leh:

TP-3

TP-4

Reh:

DIN OUT

L401

---.,

I I

I

(fJ)

I

L

l

SFR201

/(jf)---'

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SFR301

~P-I

I

Adjustment Location

Head azimuth serew

L401 L 301: • OSCswiteh: Center

L 201 SFR 301 • OSC switeh: Center SFR 201

SFR 303

SFR 302

SFR 304

®

or

®

©or@

Remarks (Specification)

• Load resistanee 4n

• Test tape TTA·117D (10kHz portaion l .OSC switch: Center

• 55kHz±0.5kHz

.• Adjust for maximum voltage at test point

• 550mA±30mA (55mV±3mV)

• Input: DIN IN (-70dBv. 1kHz)

• FUNCTION: CASSETTE • ALC: OFF

• Equalize the voltaqs at the test point for both ehannels (L, R).

• Input: DIN IN (-50dBv, 1kHz)

• FUNCTION: CASSETTE • ALC: ON

• Equalize the voltage at the tdst point for the both ehannels (L, R)

• Load resistanee47kn

• Test tape TTA-112A

• Make the output differenee between both ehannels within 2dB

• Load resistanee47kn

• Test tape TTA-161

• Make the outout differenee between both ehannels within 1dB

((jf)'---'

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5

MODEL TPR·940EE, UK

ADJUSTMENTS

AIWA

RADIO SECTION

• Location of Main Parts

Ll05

t.tot

~

IFTIOI

IF~I[gJ

[@

AM DET OUT

tr

IFTI04 IfTI05

~~

~

SFRIOI

1. Instruments Required

Signal Source

1 RF Signal generator (AM. FM).

2. IF sweep generator (Centered 455kHz/468kHz for AM and

10.7 MHz for FMl.

3. Loop antenna

4. Capacitor 10pF

Output Indicator

1.

V.T.V.M.

2. Oscilloscope

Regulator Adjusting Steps

For band

1. AM LW

2.

MW

3.

4. SW 1st: R F frequency range

FM

5.

For stages on each band 1st: 1F 1st:

RF frequency range

2nd: RF tracking 1st: RF frequency range

2nd: RF tracking

2nd: R F tracking 1st:

IF

2nd:

RF freq uency range

3rd: RF tracking

MPX Adjustment

Adjustment Conditions

Carrier frequency

Input Signal Modulation frequency Modulation

AM-IF Alignment

Step Set signal to

1

LW-RF Alignment

Step

1

2

3

4

5 6

83 MHz

54dB 1kHz

100%

Signal source

Connect to

AM IF sweepgen.

Test point TP·1

Signal source

Connect to

AM signal gen.

Loop anten na

Loop antenna

(Repeat steps1and 2 to obtain frequency range.)

Loop antenna

(Repeat steps4and5to minimize tracking error, and also steo3if necessary,)

Sweep centered

455

kHz

"EE" model

468

kHz

"UK" model

Set signal to

145

kHz

(Modu lated)

320 kHz AM det. 320 kHz

(Modulated)

150

kHz

(Modulated)

300

kHz

(Modulated)

MODE switch to STEREO; input applied to FM ANT INPUT: DIN OUT output employed. Adjustment: Adjust separation trimmer resistor SF R-101 for optimum separation. After adjustment, confirm that stereo indicator lights.

Alignment

indicator

Connect to Oscilloscope

AM det.

output tab

Alignment

indicator

Connect to

V.T.V.M.

AM det.

outpur tab

output tab

AM det.

outpur tab

AM det.

output tab

Set radio dial to

Min. Freq.

Set radio dial to

145

kHz Ll08

(Lowend) (aSe coi!)

(High end) (oac trirn.)

150

kHz

300

kHz

Adjust

CFT·l0l

Adjust

TC-7

L105

(ANT co

(ANT trirn.)

it)

TC-4

Adjust for

Maximum

Adjust for

Maximum

6

AIWA

MW-R F Alignment

MODEL TPR-940EE, UK

Step

1 Loop antenna

2

3 4 Loop anten na

5

6

SW-RF Alignment

Step Set signal to

1 Antenna terminal

2

3 4

5

6

FM-I F Alignment

Signal souree

Conneet to

AM signal gen. V.T.V.M.

Loop anten na

(Repeat steps 1 and 2 to obtain frequency range.)

Loop antenna

(Repeat steps 4 and 5 to minimize tracking error, and also step 3 if necessary.)

Signal souree

Conneet to

AM signal gen.

Antenna terminal

(Repeat steps 1 and 2 to obtain frequency range.)

Antenna terminal

(Repeat steps 4 and 5 to minimize tracking error, and also step 3 if necessary.)

Set signal to

515kHz

(Modulated)

1650kHz

(Modulated)

600 kHz AM det.

(Modulated) output tab (ANT coil)

1400 kHz AM det.

(Modulated) output tab (ANT trtrn.)

5.7 MHz AM det.

(Modulated)

18.5 MHz

(Modulated)

5.9 MHz

(Modulated)

18 MHz AM det.

(Modulated)

Alignment

indicator

Connect to

AM det. 515 kHz Ll09

output tab

AM det. 1650 kHz

output tab (High end)

Alignment

indicator

Connect to

V.T.V.M.

output tab (Lowend) (OSC coi l)

AM det. 18.5 MHz

output tab (High end) (OSC tr im.)

AM det.

output tab

output tab (ANTtrim)

Set radio dial to

(Lowend)

600 kHz

1400 kHz

Set radio dial to

5.7 MHz Ll07

5.9 MHz

18 MHz

Adjust

(OSC coil)

TC-8

(OSC trim.)

Ll06

TC-5

Adjust Adjust tor

TC-6

L 104

(ANT co

it)

TC-3

Adjust tor

Maximum

Step Set signal to

1

2

3

Signal souree

Connect to

FM IF sweep gen.

Test point TP-2

(Repeat 1 and 2 to obtain a balanced

FM-RF Alignment

Step Set signal to

1 Antenna terminal

2

3 (Repeat steps 1 and 2 to obtain frequency range.)

4

5

6

Signal souree

Conneet to

FM signal gen.

Antenna terminal

(Repeat steps 4 and 5,

Alignment

indieator

Connect to

OsciIloscope

Sweep centered FM det.

10.7 MHz output tab

Sweep centered FM det.

10.7 MHz

87.5 MHz FM det.

(Modulated)

108.5 MHz FM det.

(Modulated) outpur tab

88 MHz FM det.

(Modulated)

108 MHz

(Modulated)

to minimize tracking error, and step 3ifnecessarv.)

outpur tab

"5"

curve linearity.)

Alignment

indieator

Conneet to

V.T.V.M.

outpur tab

output tab

FM det.

outpur tab

Set radio dial to Adjust Adjust tor

Max. Freq.

Max. Freq. IFT101

Set radio dial to

87;5 MHz

(Lowend)

108.5 MHz (High end)

88 MHz

108 MHz

.

1FT 102 1FT 104 1FT 105

Adjust Adjust for

L103

(OSC coil)

TC-2

(OSC tr lrn)

L 101

(ANT coil)

TC-1

(ANT trim)

Symmetrical

response,

equal heights

Symmetrical

response,

centered

10.7 MHz

Maximum

Max.

.-

How to change the upper limit of FM frequency range from 108.5 MHz to 104MHz

Symbol No.

L101

L103 C103 C115

C113

Deseription

FM Coil

FM Coil Ceramic capacitor Ceramic capacitor Ceramic capacitor 39pF

2-1/4t

1-1/2t 20pF 24pF

108.5 MHz 87-006-017-01

87-006-015-01 88-212-200"-01 88-212 -220-0 1 88-212 -270-0 1

7

1-3/4t 2-1/2t 27pF 27pF 30pF

104 MHz

87-006-0 16-01 87-006-018-01 88-212-230-01 88-212-230-01 88-212-240-01

MODEL TPR·940EE, UK

BLOCK DIAGRAM - TPR·940EE

ANT

AIWA

AFC

BLOCK DIAGRAM - TPR·940UK

ANT

L-ch

513 514

(PLAY) (PAUSE)

SOL

AFC

~

~~J"

815 516 S~

(COUNTER){MEMORY) (REWIN 0)

L-ch

513 514

(PLAY) (PAUSE)

SOL

~

~~J"

$15 $16 5:;---'

(GOUNTER)(MENORY){REWINO)

8

AIWA

SHEMATIC DIAGRAM - TPR-940EE

ANT

.----

I

------------------------------------

TR10l 2SC784(R) TR102 2SC784(R)

TR104 2SC380(Y) TRIOS 2SC380(Y) TR107 2SC380(Y)

TR'

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L-ECM

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Li! ~(/): I R30B

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IC301

C304

~~TA.:n37P

22m

J.I I

8'"

C'06

10/16

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LSOl ~ L502

Ci'Y:.

SFR302

1 .,

068M

C'l't.

1,5K ••

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(9 2.

~30P '" '''' ~

rr·n-057-2

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R'07 R:

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$4-8

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TR30I-304 2SC945(P) il---- -- -

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51_ 1 _ 52 AFC (OFF) 5ro ..

53-

t -

54-1 -14- REC / PB (PB) 55 -

1- 4.. .

56-1 -4" ALC (OFF) 57- 1 - 6" FUNCTlON (RADIO) 58- 1 - 2 LIGHT ICHECK (LIGHT)

5K .OC22M '00'-

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----<?---<Hl>--O--~±:ll....---,

24·

BAND 5ELECTOR (F M) 59

6 MODE (MONO) 511 .

TAPE 5ELECTOR (NORMALJ

lc313

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512"

513

514 .

515 .

516 .....

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in

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9

MODEL TPR-940EE, UK

RI33 J8K

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RISI 33K

-

----

TR112 2SC372(Y) TRl13 2SC 1364(SIJ

----------------------

I

J

7

IAc.JACKI

S9 ,.. LOUONESS (OFF) SIO , BIAS (CrO.) S" ,·OIN(ll (OFF)

S'2 OIN (2) (OFF) S

'3"

PLAY (OFF)

S14 , PAUSE (OFF) S15' '''COUNTER (OFF) S'6 .. MEMORY (OFF)

S'7 REWINO

SIB ..MOTOR SI9 ...•... OSC S20 MUTING

S21 VOLTAGE SELECTOR

(220- 240V)

(OFF) (OFF)

(OFF)

J

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IPHONESI

10

MODEL TPR-940EE, UK

SH EMATIC DIAG RAM - TPR-940U K

r--------

I

ANT

TRlol 2SC784(R) TRI02 2SC784(R) TR104 2SC380(Y) TR105 2SC 380(Y) TR107 2SC380(Y)

I

R-ECM

SI - 1 - 24 BAND SELECTOR (F M) S2 AFC (OFF) S3- 1 - 6· ... MODE (MONO) S4- 1 _14-·- . REC / PB (PB)

S5- 1 -4 TAPE SELECTOR (NORMAU S6-1-4···············ALC (OFF) S7- 1 -

6·

SB- 1

-2··············

FUNCTION (RADIO) LIGHT/CHECK (LIGHT)

S9 LOUD S/O BIAS SII DI N (

S

12·······DIN ( SI3·········PLAY SI4·········PAUS

515 COUN

S/6 MEM

11

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AIWA

R'33 leK

Rial 33K

____________ .-J

TRI12 2SC372(Y) TR113 2SC1364(8)J

-

---------------------------

1

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J6

ilIlC. JACKI

I

J

7

IIAc..lACKl

________ J

I

59 LOUDNESS (OFF) 510 ·.. BIAS (CrO.) SII' "DIN(ll (OFF) S12' "DIN(2) (OFF)

SI3 · PlAY (OFF) S!4 PAUSE (OFF) S15' COUNTER 10FFI

SI6 MEMORY (OFF)

517 REWINO 518" .. MOTOR

SI9 .... ·0SC

S20 MUTING (OFF) S21 VOl TAGE SElECTOR

S22 POWER (OFF) S23 OC (OFF)

1220- 240V)

(OFF) (OFF)

S?2

(FRONT)

R,S?

SP4

(SI DE)

L·S? SP3

(SIDE)

J 13

I?HONESI

12