JVC KD-D30A, KD-D30B, KD-D30C, KD-D30E, KD-D30J SERVICE MANUAL

...

Page 1

No. 4209 April, 1982

Page 2

	Page
Specifications	2
Features	2
Controls and Connections	3
Main Parts Location	3
Description on New Technology	4
Safety Precautions	5
Removal of the Main Parts	6
Dimensions	7
Main Adjustment	8
Block Diagram	10
Wiring Connections	11
Main Amp. P.W. Board Parts	12
Standard Schematic Diagram (Main Amplifier Circuit)	13

Done Standard Schematic Diagram (Mecha. Control Circuit) .................................... ICs 15 Power Supply P.W. Board Parts ..... 15 Power Supply P.W. Board Parts List 16 Main Amp. P.W. Board Parts List .................................... Other P.W. Board Parts, Parts List .................................... Mechanical Component Parts .................................... Enclosure Assembly and Electrical Parts .................................... Mechanical Component Parts List .................................... Enclosure Assembly and Electrical Parts List .................................... Packina. Packina Material Parts List .................................... Accessories ....................................

Specifications

Туре	: Stereo cassette deck	Input terminals
Track system	: 4-track, 2-channel	Mic jack x 2	· Max sensitivity: 0.2 mV
Tape speed	: 1-7/8 inch/sec (4.8 cm/sec)		(- 74 dBV)
Frequency response	: (O dB recording)
	Metal tape *1;
	30-12,500 Hz (±3 dB)	Input jack x 2
	SA/Chrome tape *2:		Input impedance: 100 k0
	30-8,000 Hz (±3 dB)	Output terminals	input impedance, 100 km
	SF/Normal tape *3;		: Output loval: 200 mV
	30-8,000 Hz (±3 dB)
	(-20 dB recording)	Phones jack × 1	: Output Impedance, 5 km
	Metal tape *1;		Matching impedance: 9 1 k0
	20–16,000 Hz	Power requirement
	30-15,000 Hz (±30 dB)	i ower requirement
	SA/Chrome tape *2:
	20-16,000 Hz		50/60 Hz (KD D2011)
	30-15,000 Hz (± 3 dB)	Power consumption	: With power on 17 M
	SF/Normal tape *3:		With power on 17 W
	20-15.000 Hz	Dimensions	• 17 1/9" (425 mm) W/
	30-14.000 Hz (± 3 dB)	Dimensions	19/16" (116 mm) H
Note: *1 IVC	ME or Equivalent		10.13/16″ (275 mm) D
*2 TDK	SA or Equivalent	Weight
*3 MA)		Accessories	: Pin plug cord
S/N rotio		Accessiones
S/IN TALIO	: 58 UB (S = 1 KHZ, K3 = 3%,	Design and specifica	tions are subject to obspace without
	N = A-weight, Metal tape)	notice	tions are subject to change without
	1E dB at EQO He and by may




	ADOVE 5 KHZ WITH ANRS/DULBY B	Eastura
Improvement of MO		reatures	5
improvement of MO

Wow and flutter		• DOLBY * C NR sys	item.
wow and nutter	: 0.05% (WRIVIS), 0.16% (DIN 45 500)	Music Scan mecha	anism
Croostally		"Under license of	Staar S.A., Brussels Belgium''
		Metal tape compatient	tible.
harmonic distortion		2-color LED peak I	evel indicator.
Hoodo		IMER START facilities	lity.
neaus	ding (newback, 2 and for recor-	Full auto-stop mec	hanism.
	for crocure	I ape running indic	ator.
Motor	Flastrania neuronal DC mater	Geared and oil-dan	nped cassette door.
Fast fl muand time	. Electronic governed DC motor	Automatic input se	elect.
	cassette	REC MUTE (record	muting) mechanism.
Rewind time	: Approx 100 sec. with C-60 cassette	* ''Dolby'' and the dou Laboratories Licensi	uble-D symbol are trademark of Dolby

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Controls and Connections

Fig. 1

Fig. 2

1. POWER switch
2. MULTI PEAK INDICATOR
3. Tape running indicator
4. Cassette holder
5. Tape COUNTER/counter RESET button
6. NR SYSTEM switches [OFF, ANRS DOLBY C]
7. Headphone jack [PHONES]
8. Microphone jacks [MIC-L, MIC-R]
9. TAPE SELECT switches [METAL, SA/CrO2, SF/NORM]
10. REC LEVEL control (right)
11. REC LEVEL control (left)

12. Cassette operation buttons
- O REC (Record) button
- REW/REV (Rewind/Review) button
- PLAY button
- ►► FF/CUE (Fast forward/cue) button
- STOP button
- PAUSE button
13. EJECT button
14. REC MUTE button
15. Power cord
16. Voltage select switch
17. LINE IN (REC) terminals
18. LINE OUT (PLAY) terminals

Main Parts Location

1. Power switch
2. Pin jacks ass'y
3. Recording switch
4. Power transformer
5. Remote bar for power transformer
6. Microphone jacks
7. Main P.W. board ass'y
8. Tape select switches
9. Motor
10. Hall IC. P.W. board

Fig. 3

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Description of New Technology

Dolby C-type Noise Reduction System

- A newly developed IC is used to reduce noise and expand the MOL (maximum output level) dramatically. -

The Dolby C-type closely resembles the B-type in operation, the system compatible with ANRS, yet offers even better performance and more distinctive features. Namely: • Noise reduction is greater -20 dB from 1 kHz to

10 kHz and as much as 15 dB at 500 Hz.
At 10 kHz it improves MOL by 4 dB when recorded at 0 VU.
It is immune to undesirable side effects such as modulation noise and breathing.

Dolby C noise reduction solves the problem of achieving a large amount of compression and expansion without introducing undesirable side effects by the use of two processing stages in series, each supplying 10 dB of compression during recording and of expansion during playback. These circuits operate at independent levels. One, identified as the high-level stage in Figure B, is sensitive to signals at about the same levels as Dolby B-type noise reduction, while the other, the low-level stage, operates on signals of somewhat lower level. Because the two stages operate in tandem with each other, their effect is to multiply the signals (or add and subtract in dB's), so that a total of 20 dB of compression and expansion, and thus of noise reduction is accomplished. Yet simultaneously, at no time is the signal subject to the vagaries of a single compression. or expansion action of 20 dB. In other words, the tandem two-level, two-stage configuration provides a much more accurate control of the signal than a single compander circuit would be able to achieve.

Since a single newly developed IC is used for Dolby C noise reduction in this unit, compared with the Dolby B ICs two normally used, better characteristics are achieved.

1. Recording/playback mode and NR mode (OFF/Dolby B/ Dolby C) selection is electronic.
2. The circuit does not need adjustment.
3. The over-shoot and limiter level specified for Dolby B and C are adopted to give better transient characteristics.

4. Phase distortion is improved by use of a full-wave rectifying circuit.
Almost totally integrated with few external components.
With all signal processing performed in a single chip, characteristics in recording and playback are indentical.
7. Since the same elements are used for spectral skewing and in the anti-saturation network in both recording and playback, the characteristics are the same.
8. Multiplex buffer amplifier built-in.
External semi-fixed resistor allows setting of monitor output level to required level.
Since the performance of the unit is not affected by the side chain when noise reduction is switched off, distortion and frequency response do not deteriorate.
11. It can be used as two Dolby B noise reduction circuits.

Other developments

In addition to two-level processing, Dolby C-type noise reduction incorporates a number of further innovations. Two of these, shown in Figure B as anti-saturation and spectral skewing networks, are carefully calculated frequency response modifications introduced in the encoding (record) process and reciprocally compensated for in the decode (playback) process. Their purpose is two-fold: to further guard against audible side effects, and to ensure the practicality of the system in day-to-day consumer use. The specific benefits of these innovations include the reduction of encode-decorde errors and a reduction of upper-middle and high frequency tape saturation and its side effects, such as high frequency losses and intermodulation distortion. Together with the two-level twostage configuration, these new developments result in a 20 dB noise reduction system at least as free of side effects as the 10 dB B-type system, and one which is just as practical in day-to-day use.

Fig. 4-A Low-level encoding frequency response

Page 5

These curves, showing the maximum low-level boost imparted by both C-type and B-type noise reduction in the absence of high frequency signals, illustrate some of the similarities and differences between the two systems. Dolby C noise reduction imparts more boost in recording and more cut in playback, thus providing more noise reduc-

tion. The effect also extends about two octaves lower with C-type noise reduction to maintain subjectively uniform noise level across the spectrum. Processing at very low frequencies is not required with either system because low frequency noise is insignificant in properly engineered cassette recorders.

Fig. 4-B Dolby C-type NR block diagram

Safety Precautions

▲Safety mark

Safety is very important with this unit. When replacing the parts marked A, be sure to use only those designated parts. The designated resistors, diodes, transistors become hot in use. When replacing, be sure to secure them with a distance of more than 5 mm from the circuit board. In addition, they are banded together to avoid touching other wiring, recheck this point as well after repair.

The wiring of the primary side should be wound more than one and half times, then soldered.

To protect the circuit board from carbonized under abnormal condition.

Fig. 5

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Removal of the Main Parts

Observe care in handling the parts since the parts are small in size and the distance between them are short due to a deck design aimed mainly at compactness and high performance.

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Enclosure assembly parts

1. Cassette door

Push the EJECT button to open the cassette door. Slide off the cassette door upwards to unlock its pawls off both sides.

2. Top cover

Remove 6 screws 1. (left, right and rear ..... 2 screws on each.)

3. Bottom cover Remove 6 screws (2)
4. Front plate assembly

Remove 6 screws (4 screws (3) on upper side and 2 screws (4) on bottom side).

5. Cassette holder Remove 2 screws (5) fastening the door bracket ass'y.

Mechanical assembly

Remove 6 screws 6 fastening the mechanical ass'y (2 screws on the front bracket, and 4 screws on the chassis.)

Mechanical parts

The removal methods of mechanical parts are the same as model KD-D20. Please refer to service manual of KD-D20 (No. 4208 page 6).

Electrical parts

When removing wire clamp (QHX2075-001), cut off it and when clamping wires, use new parts.

1. Power switch
- Remove 2 screws (7) fastening the power switch.
Power transformer Remove 4 screws (8) fastening the power transformer. Slide knobs (Recording level control)
Remove 2 screws (9) fastening the blind. 4. Main amplifier P.W. board ass'v
- 1) Pull off 4 knob holders (10) of tape select switches and NR system switch.
- 2) Remove a screw (12) fastening PIN jacks cover.
- 3) Remove the recording switch wire (13)
- 4) Remove 5 screws (14) fastening the main amplifier P.W. board.
- 5) Slide down the rear side of main amp. P.W. board and pull off it to rear side.
5. Power supply P.W. board ass'y
- Remove 4 screws (15) fastening the power supply P.W. board

Dimensions

- 7 -

Page 8

Main Adjustments

[I] Equipment and measuring instruments used for adjustment

1. Electrical adjustment

1) Electronic voltmeter
Audio frequency oscillator (range: 50-20 kHz and output 0 dB with impedance 600 Ω)
3) Attenuator
4) Standard tapes for REC/PB Maxell UD — SF tape TDK SA — SA tape IVC ME — Metal tape
5) Reference tapes for playback (JVC Test Tape) VTT-658 (for head azimuth adj.) VTT-656 (for motor speed, wow flutter adj.) VTT-664 (for Reference Level 1 kHz) VTT-675N (for playback frequency response)
VII-675N (for playback frequency response) 6) Resistor 600 Ω (for attenuator matching)

2. Mechanical adjustment

1) Torque testing cassette gauge, CTG-N.
2) Blank tape (C-120) for tape running checker.

[II] Mechanical adjustment

This adjustment is the same as those of the service manual for PC-3 JW/W/WH/C (No. 1469) or PC-3L/LB (No. 1470).

Please refer to the service manual of PC-3 JW/W/WH/C (No. 1469, page 17) or PC-3L/LB (No. 1470 page 17).

[III] Electrical adjustments location

Main Amp. P.W. Board (parts ass'y side view)

Fig. 8

[IV] Electrical circuit adjustment procedure

In the steps marked by an asterisk (*), adjustment should be performed, however, only checking is sufficient with steps other than those.

Adjustment should be performed in the order of steps 1, 2, 3,..... Perform this adjustment with the NR SYSTEM switch set to OFF.

Step	ltem	Adjustment	Adjusting point	Standard value	Remarks
1*	Playback frequency response	Play back test tape VTT-675N (1 kHz, 10 kHz) for following adjustment. 1. Connect/Disconnect C102 or C103 so that 10 kHz signal and 1 kHz signal gains become flat response.	C102 C103	Reference frequency: 1 kHz 0±2 dB at 10 kHz	NR SYSTEM: OFF TAPE SELECT: SF/NORM
2*	Adjusting playback level	Play back the VTT-664 Reference tape (1 kHz) with the tape select switch set to the SF/NORM position. Adjust VR101 and VR201 until the LINE OUT becomes about -8 dBs.	VR101 201	- 8 dBs	This adjustment becomes necessary when a change in playback level results (for example, due to head replacement).

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Step	ltem	Adjustment	Adjusting point	Standard value	Remarks
3*	Checking record/ playback frequency response	Record 1 kHz, 50 Hz and 12.5 kHz signals at an input level of 0 dB to - 20 dB. Play back the tape. Check to see that the 50 Hz and 12.5 kHz signal output deviations fall within the standard range, using the 1 kHz signal out- put as a reference. Increase in high frequencies (with a small bias current) Optimum level Decrease in high frequencies (with a larger bias current) 1kHz 12.5kHz Frequency (Hz)	For SF/ NORM tape; VR103 203 For Metal tape; VR104 204	Reference frequency; 1 kHz 0±3 dB at 50 Hz 0±4 dB at 12.5 kHz	This checking should be performed for normal tape and for both right and left channels. 1. Bias current adjustment for a cassette deck should generally be performed referring to the record/playback frequency response. This is because the frequency response of a cassette deck depends more greatly upon the bias current than does that of an open reel deck. 2. If the bias current is not properly adjusted, the record and playback characteristics become as shown left.
4	Adjusting recording level	Apply a 1 kHz, approx 10 dB signal to the LINE IN terminals. Adjust the recording level controls until the signal is available at - 8 dBs at the LINE OUT terminals. After checking to see if the Peak level indicator become 0, record the signal applied to both left and right channels using normal tape. Play back the recording part. Perform the recording signal adjustment with VR102 and VR202 so that the peak level indicator become 0.	VR102 202	0 VU	The level difference between left and right channels for SF/NORM tape and metal tape should be less than 1 dB. Perform the adjustment using a normal tape, level difference between recor- ding and playback for metal tape, should be less than 1.5 dB, and that between left and right channels should also be less than 1 dB.
5	Checking record/ playback signal distortion	Record a 1 kHz, -8 dBs signal to LINE IN terminals and perform recording with the peak level indicator become 0. Play back the recorded part. Check the output with a distortion meter to see if the value conforms to the standard value.		SF/NORM tape; Less than 2.5% SA/CrO2 tape; Less than 3% Metal tape; Less than 2%	Be sure to perform this adjustment following bias current and recording level adjustments.
6	Checking signal to noise ratio in record- ing/play- back	Record a 1 kHz, O dB signal. Stop the in- put by disconnecting from the terminal to perform nonsignal recording. Play back the recorded part. Measure the O dB recording output and the non- signal recording output for comparison using an electronic voltmeter. Check to see if the value conforms to the standard value.		SF/NORM, and Metal tapes; More than 42 dB
7	Checking erasing coefficient	Apply a 1 kHz signal to the LINE IN terminals. Adjust the recording level controls until the peak level indicator become 0. Perform recording with the signal enhanced by 20 dB. Erase a part of the recording. Measure the output difference between the erased part and nonerased part to compare with an electronic voltmeter.		More than 65 dB	For the measuring, connect a band pass filter between the deck and the elec- tronic voltmeter. Input (1kHz OdB + 2OdB) Band pass filter (1kHz)
8.	Check Auto stop	Hold less than 1 +0 -0.5 mm gap to the mag	net from the h	all IC.

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Block Diagram

Recording System

Playback System

Power Supply and Mecha. Control Circuit

Page 11

Wiring Connections

Page 12

No. 4209 - 12 -

Page 13

Standard Schematic Diagram of KD-D30 (Main Amplifier Circuit)

- 13 -

No. 4209

Page 14

Page 15

Power Supply P.W. Board Parts

Page 16

Power Supply P.W. Board Parts List

▲ parts are safety assurance parts.

When replacing those parts, make sure to use the specified one.

Ref. No.	⚠	Parts No.	Parts Name	Remar	ks	Q'ty
R1 R2 R3 R4 R5	♪	VMW2541-***A QRG019J-4R7 QRG019J-152 QRD129J-821S QRD121J-122 QRG019J-680	P.W. Board O.M.F. Resistor " C. Resistor " O.M.F. Resistor	4.7 Ω 1.5 kΩ 820 Ω 1.2 kΩ 68 Ω	1 W 1 W 2 W 1/2W 1 W	1 1 1 1 1 1
R6,7 R8 R9 R10,24,25 R11,14,35		QRD161J-152 QRD121J-2R2 QRD161J-224 ″-562 ″-563	C. Resistor " " "	1.5 kΩ 2.2 Ω 220 kΩ 5.6 kΩ 56 kΩ	1/6 W 1/2 W 1/6 W ″	2 1 1 3 3
R12,13,31,36 R15 R16 R17 R18		" -103 " -682 " -333 QRD143J-225S QRD161J-222	"	10 kΩ 6.8 kΩ 33 kΩ 2.2 MΩ 2.2 kΩ	" " 1/4 W 1/6 W	4 1 1 1 1
R19 R2O,21,23 R22 R26 R27		" -472 " -223 " -151 QRD147J-102S QRD161J-224		4.7 kΩ 22 kΩ 150 Ω 1 kΩ 220 kΩ	″ ″ 1/4 W 1/6 W	1 3 1 1 1
R30 R32 R33 R34 R37		QRD149J-121S QRD161J-333 ″ -473 ″ -153 QRD147J-152S	O.M.F. Resistor C. Resistor ″ ″	120 Ω 33 kΩ 47 kΩ 15 kΩ 1.5 kΩ	2 W 1/6 W ″ 1/4 W	1 1 1 1
C1 C2,3 C4,5,6,7 C8 C9		QET41ER-108 QCF11HP-103 QET41HR-477 QET61ER-476 QET61ER-336	E. Capacitor F.C. Capacitor E. Capacitor			1 2 4 1 1
C10,13 C11 C12 C14 C15		QET61HR-106 QET61ER-107 QEN41EM-226 QET41HR-104N QFM41HJ-154	" " N.P.E. Capacitor E. Capacitor Mylar Capacitor			2 1 1 1 1
C16 C17 C18 C30 C31		QET61ER-476 QFN31HJ-103 QET41HR-227N QET41ER-477N QET41HR-106	E. Capacitor Mylar Capacitor E. Capacitor "			1 1 1 1
IC1 IC31 Q2 Q3 Q4,5,31		LA2000 IR2408 2SC1318(R,S) 2SC1685(R,S)PH 2SA564(R,S)	IC " Si. Transistor "			1 1 1 3
Q32 D1~4,5,7,8 D6 D9~16, 31~36 D17		2SC1685(R,S)PH 10E1-B RD20E(E3) 1SS119-14TE 10E1-B	" Si Diode Zener Diode Si Diode "	MA165-TA5		1 7 1 14 1

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Main Amp. P.W. Board Parts List

▲ parts are safety assurance parts.

When replacing those parts, make sure to use the specified one.

Ref. No.	⚠	Parts No.	Parts Name	Ren	narks	Q'ty
		VMW1580-***A	P.W. Board			1
R101,201,119		QRD161J-273	C. Resistor	27 kΩ	1/6 W	7
219,160,260
901		" 222	"	2210	"	٩
R102,202,127		-332		3.3 KM		5

B103 203 105		″ -104	"	100 kΩ	"	12
205.121.221
145,245,169
269,905,916				10010	"	2
R104,204		// ·184	,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,		"
R106,206,138		″ -823		02 KM		-
238				120.0	"	2
R107,207			"	1 MO	"	6
R108,208,172		-105		1 10122		Ŭ
2/2,1/3,2/3 P100 200 120		" _222	"	2.2 kΩ	"	9
220 134 234
167.267.929
R110,210,170		″ -103	"	10 kΩ	"	10
270,171,271
906,911,913
931		" 101	"	100 0	"	4
R111,211,100		-101		100 1
200	-	// 152	"	1.5 kΩ	"	4
R112,212,144		-152		1.0 (12
244 B113 213		″ -224	"	220 kΩ	"	2
R114,214,140		" -123	"	12 kΩ	"	4
240
R115,215,163		″ -223	"	220 kΩ	"	4
263			"	1740	"	12
R116,216,126		-4/2		4.7 1.1		12

253 914 923
P117 217 910	1	″ -562	"	5.6 kΩ	"	4
912		002
R118,218		″ -274	"	270 kΩ	"	2
R129,229,130		″ -682	"	6.8 kΩ	"	4
230			"	1 40	"	5
R131,231,164		" -102		1 K12
264,928		" _683	"	68 kΩ	"	6
259 908 909
P122 222		″ -512	"	5.1 kΩ	"	2
R135,235 157		" -473	"	47 kΩ	"	5
257.922				-
R136,236,142		″ -334	"	330 kΩ	"	4
242				200 10	"	6
R137,237,143				390 KM
243,148,248		″ - 753	"	75 kΩ	"	2
n141,241		-755	"	120 40	"	4
K14/,24/,162		-124
B150 250		″ -151	"	150 Ω	"	2
R151.251.902		″ -563	"	56 kΩ	"	3
R152,252		″ -153	"	15 kΩ	"	2
R154,254		″ -821	"	820 Ω	"	2
R155,255		″ -393	"	39 kΩ	"
R156,256,158		″ -333	\| "	33 kΩ	"	4
258						1

Page 18

Ref. No.	♪	Parts No.	Parts Name	Rema	arks	Q'ty
R161,261 R165,265 R168,268 R915 R917		QRD143J-155S QRD161J-560 ″ -154 ″ -6R8 QRD121J-272	C. Resistor	1.5 ΜΩ 56 Ω 150 kΩ 6.8 Ω 2.7 kΩ	1/6 W ″ ″ 1/2 W	2 2 2 1
R918 R919 R920 R921 R924		QRG019J-181 "-680 QRD129J-4R7 QRD149J-100S QRD121J-122	O.M.F. Resistor " C. Resistor "	180 Ω 68 Ω 4.7 Ω 10 Ω 1.2 kΩ	1W ″ 1/2 W 1/4 W 1/2 W	1 1 1 1 1
R925 R926 C100,200 C101,201 C102,202		"-681 QRG019J-680 QCS11HJ-331 "-361 "-131	" O.M.F. Resistor F.C. Capacitor "	680 Ω 68 Ω 330 pF 360 pF 130 pF	″ 1 W 50 V ″	1 1 2 2 2
C103,203 C104,204 C105,205 C106,206,108 208,143,243 154,254,906 C107,207		"-201 QEB41EM-106 QCS11HJ-471 QET41ERT-476	" E. Capacitor (Low Leak) F.C. Capacitor E. Capacitor	200 pF 10 μF 470 pF 47 μF	″ 25 V 50 V 25 V	2 2 9
C109,209 C110,210 C111,211 C112,212 C113,213		QET41ER-227N QEB41EM-475 QET41AR-107 QFN41HJ-822 ″ -182	E. Capacitor E. Capacitor (Low Leak) E. Capacitor M. Capacitor	220 μF 4.7 μF 100 μF 0.0082 μF 0.0018 μF	25 V 10 V 50 V "	2 2 2 2 2 2 2
C114,214,123 223 C115,215,116		″ -103 QEB41HM-105	" E. Capacitor (Low Leak)	0.01 μF 1 μF	″ 50 V	4
C117,217 C118,218,121 221,124,224 133,233,904 905 C122,222,142		QCS11HJ-470 QET41HR-106N ″ -335N	F.C. Capacitor E. Capacitor "	47 pF 10 μF 3.3 μF	" "	2 10 4
C125,225 C127,227,134 234		QFN41HJ-473 ″ -472	M. Capacitor	0.047 μF 0.0047 μF	"	2 4
C128,228,132 232,136,236 C129,229 C130,230,156 256	·	″ -333 ″ -683 ″ -104	" " "	0.033 μF 0.068 μF 0.01 μF	" " "	6 2 4
C131,231 C135,235 C138,238,141 241,149,249 901,903 C139,239		"-154 QEB41HM-224 QET41HR-105	" E. Capacitor (Low Leak) E. Capacitor	0.15 μF 0.22 μF 1 μF	"" "	2 2 8
C140,240 C144,244 C145,245 C146,246,160		QET41CR-227N QET41HR-104N QFN41HJ-122 QFN41HJ-152	" M. Capacitor M. Capacitor	220 μF 0.1 μF 0.0012 μF 0.0015 μF	16 V 50 V ^″ 50 V	2 2 2 2 4
260 C147,247 C148,248		QET41HR-105 QFN41HJ-124	E. Capacitor M. Capacitor	1 μF Ο.12 μF	" "	2 2
C150,250,909 C151,251 C152,252 C153,253		" -153 " -392 QCS11HJ-391 QCS12HJ-151	″ ″ C. Capacitor	0.015 μF 0.0039 μF 390 pF 150 pF	″ ″ 500 V	3 2 2 2

Page 19

Ref. No.	₼	Parts No.	Parts Name	Remarks	Qʻty
C155,255 C157,257 C158,258,910 C159,259 C907		QCY12HK-221 QCS11HJ-151 QET41HR-474N QFN41HJ-102 QET40JR-227N	C. Capacitor " E. Capacitor M. Capacitor E. Capacitor	220 pF 500 V 150 pF 50 V 0.47 μF " 0.001 μF " 220 μF 6.3 V	2 2 3 2 1
C908 C911 C912 C914 CRB1,2		QFP82AJ-103 QFP82XJ-152 QFN41HJ-122 QET41ER-336N EXR-P472M393W	P.P. Capacitor M. Capacitor E. Capacitor C.R. Block	0.01 μF 100 V 0.0015 μF 0.0012 μF 50 V 33 μF 25 V	1 1 1 1 2
VR101,201 VR102,202 VR103,203,104 204	α.	QVP8A0B-054	V. Resistor	50 kΩ 20 kΩ 220 kΩ	2 2 4 2
L101,201		VQZ0013-001			2
L103,203 L104,204,105 205		VQP0001-332S ″-183S	Inductor ″		2 4
T901 IC101,201		VQH1009-018 VYH4514-002 NE652N	OSC Coil Shield Case IC	Dolby	1 1 2 2
IC901 IC902 Q101,201,102 202,108,208	♪	AN6552 UPC78L15 2SC2634(T)	″″ ″ Si. Transistor		1 1 6
Q103,203,106 206,109,209 110,210,901 902,905		2SC1685(R,S)PH	"		11
Q107,207		2SC2001(L,K)	"		2
Q903,904 D901,902 904 ~ 908		2SC2274(E,F) 1SS119-14TE	″ Si. Diode	or MA165-TA5	2 7
D903 S1 S2,3		RD6.8E(B3) QSS9201-005R QST4242-V03	Zener Diode Slide Switch Push Switch	for REC/PB for NR	1 1 1
S4,5 CN901		"-V02 VMJ5006-003 VMJ3004-102 QMV5005-005	″ Jack Ass'y PIN Jack Ass'y Plug Ass'y	for EQ for MIC & H.P	1 1 1 1

Page 20

Other P.W. Board Parts

Slide Switch (Voltage select SW)

Other P.W. Board Parts List

▲ parts are safety assurance parts. When replacing those parts, make sure to use the specified one.

Fig. 15

Ref. No.	Δ	Parts No.	Parts Name	Remarks	Q'ty
(R/P Head)		VMW4647-001	P.W. Board	for R/P Head	1
(LED)		VMW4629-001 LD-702	P.W. Board LED		1
(Voltage select swi	tch)
S02		VMW4644-002 VKS4354-001 QSS2325-203BS QSS2325-203 QSR0084-001 VMA4151-001 VYSR106-007	P.W. Board Wire Clamp Slide Switch Slide Switch V. Select Switch Insulator Spacer	KD-D30B KD-D30 A/C/E/J KD-D30U for Voltage select switch	1 1 1 1 1 1 1
(Input Volume)
VR105,205		VMW1580-*B VMW1580-*C QVZ6201-001	P.W. Board ″ V. Resistor		1 1 1
(Level Indicator)
RA,RB CC,CD CA,CB CE		LT-1062 QRD161J-472 QET41ER-106N QET41HR-105N QET41ER-226N	L.E.D. Module C. Resistor E. Capacitor		1 2 2 2 1
(Indicator)
D961 D962,963		VMW1580-***D GL-9PR92 GL-9NG92	P.W. Board L.E.D.	Red Green	1 1 1
(Rec Mute SW)		VMW1580-***E QSP0301-002	P.W. Board Push Switch		1
(Power Transistor)
Q1		VMW2541-***B 2SC1162(B,C) VKL5002-001 DPSP3006Z	P.W. Board Si. Transistor Heat Sink Screw	for Q1 for Q1	1 1 1 1
(Hall IC)
		VMW2541-***C DN6835A	P.W. Board Hall IC		1
(Power Switch)
S01	♪	VMW2541-***D QSP0219-061	P.W. Board Push Switch		1
(Tape run LED)
D981~982		VMW2541-***E GL-9PR92	P.W. Board L.E.D.	red	1 3

Page 21

Mechanical Component Parts

Page 22

KD-D30 A/B/C/E/J/U

No. 4209 - 22 -

Page 23

Mechanical Component Parts List

▲ parts are safety assurance parts.

A parts are safety assurance parts. When replacing those parts, make sure to use the specified one.

Def No		Parts No	Parts Name	Bemarks	Q'ty
Ref. NO.			Moin Pace		1
		VK52115-001	Pause Trigger		1
		VK34400-001	Spring	Pause Trigger	1
3		VK$4401-001	FELever		1
5		VKW3006-027	Spring	FF Lever	1
6		VK$4402-001	Play Trigger		1
		VKW3006-028	Spring	Play Trigger	1
8		VKS4403-002	EB Safety		1
9		VKS4404-001	Rew Lever		1
10		VKW3006-029	Spring	Rew Lever	1
11		VKS4405-00A	Pause Arm Ass'v		1
12		VKS4483-00A	Play Arm Ass'y		1
13		VKW4333-001	Spring	Pause Cam	1
14		VKS3147-001	Pause Cam		1
15		VKS4410-002	Lock Bush	Pause Cam	1
16		VKW4334-001	Spring	Play Cam	1
17		VKS4411-002	Play Cam		\| 1
18		VKS4410-002	Lock Bush	Play Cam
20		VKS2117-00A	Disk Base Ass'y
21		VKR4265-00A	Supply Reel Ass'y
22		VKZ4003-003	Felt	Back Tension
23		VKR4170-001	Ring
24		VKS4131-001	Reel Stopper
25		VKR4267-00A	Take-up Reel Ass y
26		VKR4170-001	Ring
27		VKS4131-001	Reel Stopper
28		VKS3148-00A	FR Base Ass'y	FF	1
29		VKW3006-031	Spring
30		VKW3000-032	Bew Gear		1
			Special Wester	Row Gear	1
32		VK24004-001	ER Stopper
33		VKW3006-033	Spring	FB Base	1
35		VKS4414-00A	FR Arm Ass'v		1
36		VKW3006-034	Spring	FR Arm	1
37	+	VKH3000-045	Collar	"	1
38		VKS4416-002	FR Trigger		1
39		VKW3006-035	Spring	FR Trigger	\| 1
40		VKS4417-001	FR Cam		\| 1
41		VKW3006-036	Spring	FR Cam	1
42		VKS4410-002	Lock Bush		1
43		VKS4418-001	Return Lever		\| 1
44		VKW3006-045	Spring	Return Spring
45		VKR4272-00A	FW. Gear Ass'y
46		VKR4276-001	Roller
47		VKL3352-00A	Chassis Base Ass'y
49		VKL3354-00A	Button Case Ass'y
50		VKS4420-00A	Button Ass'y		2
51		VK54420-00C	Pause Button Ass'y
52		VK34493-00A			1
53		VKW4345-002	spring ″
54		-001 VKW/4326-001	"		2
55		VKI 3355-007	Bec Cam		1
57		VKL5125-00A	Main Cam Ass'y		1
E0		VKI 3357-002	Sub Cam		1
50		VKL3358-001	Switch Cam		1
60		VKW3002-094	Tension Spring	Switch Cam ~ Main Cam	2
61		// -100	,	Switch Cam ~ Rec. Cam	\| 1

Page 24

Ref. No.	⚠	Parts No.	Parts Name	Remarks	Q'ty
62 63 64 65 66		VKW3002-095 VKS4422-001 VKW4340-001 VKW4327-002 VKS4423-001	Tension Spring Select Arm Spring Wire Wire Stopper	Sub Cam Select Arm	1 1 1 1 1
69 70 71 72 73		VKF4115-00A VKS4424-00A VKS4427-001 VKW3002-096 VKS4428-003	Capstan Metal Ass'y Take-up Idler Ass'y Pause Arm Tension Spring Brake Arm (1)	Take-up	1 1 1 1 1
74 75 76 77 78		VKW3002-097 VKS4429-001 VKS4430-002 VKW3002-097 VKS4431-002	Tension Spring Brake Lever Brake Arm (2) Tension Spring Brake	Brake Arm (1) Brake Arm (2)	1 1 1 1 1
79 80 81 82 83		VKP4121-00A VKW4356-001 VKL3359-002 VKS2119-001 VGH0421-003	Pinch Roller Arm Ass'y Pinch Roller Spring Slide Base Head Mount Base R/P Head Ass'y		1 1 1 1 1
84 85 86 87 88		ZMM090430-0A VKW3001-020 VKW4342-002 VKW3002-099 VKS4432-002	E Head Ass'y Compression Spring Slide Base Spring Tension Spring Roller	R/P & E. Head	1 2 1 1 3
89 90 91 92 93		VKS4433-001 VKS4434-001 VKY4238-001 T41615-004 VKW4341-001	Switch Arm Cassette Guide Spring Plate Stell Ball Spring	Slide Base	1 1 1 1 1
94 95 96 97 98	♪	VKS4435-003 VKW3002-011 VGP0601-013 VKW3002-043 VKS4436-001	Rec Lever Tension Spring Solenoid Ass'y Tension Spring Rec Arm		1 1 1 1 1
99 100 101 102 103		VKF3120-00A VKW3001-010 VKB3001-011 VKL3402-001 VKS4437-001	Flywheel Ass'y Spring Belt F.M. Bracket Thrust Plate	Thrust Capstan	1 1 1 1
104 105 106 107 108	۸	MMI-6A2LKUA VKS4139-002 VKZ4014-001 VKS4438-002 VKW3002-039	D.C. Motor Motor Pulley Special Screw Rec. Safety Arm Tension Spring	Rec ^- S. Arm	1 1 4 1 1
111 112 113 114 115		VKS4492-00A VKY4239-001 VKS4490-001 VMW4647-001 VKW3006-049	Rec. Arm Ass'y Pack Spring Select Arm Printed Wiring Board Spring	for REC/PB Head	1 1 1 1 1
116 117 118 119 121		VKW4374-002 VKL3403-001 VSH1121-001 VSH1119-001 Q03093-838	" Switch Bracket Leaf Switch " Washer		1 1 2 3 1
122 123 124 125 126		" -627 " -827 " -522 REE1500 BEE2500	" " E. Ring ″	Thrust Öil Cut Select Arm x 1 Rec. Arm Unit x 1 Switch Cam x 1	1 1 1 2 2
120		NCE20UU		Switch Cam x 1 Pinch Roller Ass'v x 1	2

Page 25

Ref. No.	⚠	Parts No.	Parts Name	Remarks	Qʻty
128		HPST2604Z	Screw	Solenoid Ass'y x 1 Pack Spring x 1, Side Bracket Ass'y x 3	5
129		HPST26067	"		1
130		HPST2612Z	"	Main Base x 1 Disk Base x 1	2
132	\| .	SBSB2006Z	"	Leaf Switch	2
133		SDSP2006Z	"	"	3
134		VKZ4109-001	Motor Screw		3
135		SPSX2010N	"	R/P Head x 2 E. Head x 1	3
136		SSST2604Z	"	Capstan Metal Ass'y	3
137		SSST2605Z	"	Button Case	2
138		SPSP2612Z		Side Bracket Ass'y	1
139		SPSX2008N	Screw	E. Head	1
141		VKL3399-001	Side Bracket		1
142		VKS4488-001	Lock Arm		1
143		VKH3001-054	Flange Collar		1
144		VKS4487-001	Connecting Lever		1
145		VKW3002-063	Tension Spring	E. Button	\| 1 \|
146		″ -034	"	E. Lever	1
147		VKS4480-001	Eject Button		1
148		VKH3000-053	Collar		1
149		VKL5256-002	Bracket		1
150		SPSK1425M	Screw		1
151		VKZ4130-001	Cushion Rubber		3
152		TFB345469-01	Rubber Stopper		1
154		VKL5295-001	Stopper
155		SSSP3004Z	Screw		1
156		SDSP3004Z	Screw		1
157		VKL5199-002	Plate		1

Page 26

Enclosure Assembly and Electrical Parts List (Except P.W. Board Parts)

▲ parts are safety assurance parts.

When replacing those parts, make sure to use the specified one.

Ref. No.	Parts No.	Parts Name	Remarks	Q'ty
1	VJD3340-001	Mecha. Cover		1
2	VJD4437-003	Disk Plate	ĺ	\| 1 \|
3	VKL5257-001	Mecha. Bracket (L)
4	VXP4240-001	Push Button	Mecha.	6
5	VKB3000-053	Beit		1
6	VJD3339-001	Blind
	VK53159-001	Volume Lever
9	VKS3160-002	Bemote Bar
10	VXP4234-001	Push Button		4
11~15	ZCKDD30Y-CBF	Front Plate Ass'y
(18,21)
23~28
11	VJC1236-002	Front Plate		1
	VJD4593-001	Scale Plate		1
13	VJD4594-002	Plate		1
14	E69212-001	JVC Mark		1
15	VJD3342-001	Counter Escutcheon		1
10	VXP4241-001	Reset Knob
18	V ID3357 001	Button Escutoboon
19	VXP4239-001	Push Button	Fiect	1
20		Compression Spring
20	V ID3341-002	Button Case
22	VKI 5262-00A			1
23	V.IK3195-001	Finder
24	VJD2189-001	LED Escutcheon
25	V.ID4595-002	I ED Plate		1
26	VJD3198-001	Light Lens
27	VJD4592-001	Button Escutcheon
28	E69189-002	Push Knob Ass'y		1
29	VKS4003-011	Pipe		1
30	VYH4460-001	Gear		1
31	VJT2073-001	Cassette Door		1
32	VKY4273-001	Cassette Spring		2
33	VKY4252-002			1
34	VJ13089-001			1
35	VKW4365-002	Holder Spring		1
36	VJD3311-001			1
38	VJC2075-001	Bottom Cover
40	VJC2076-001			4
	VK73001.002	Special Scrow
42	VYN2100-002	Name Plate		4
12	″ -003PA	// ////////////////////////////////////	KD-D30A	1
	″ -004PA	"	КД-ДЗОС, -004РК	1
	″ -005PA	"	KD-D30E
	″ -006PA	"	KD-D30J	1
	″ -007PA		KD-D30U	1
43	LD-702
44	VIVIVV4629-001	Amp Chassis

46 17	VJC2074-002	Kear Panel
47 48	VKL3383-001 VKL2160-002	Front Bracket (L)
49	VKL2100-003
50	VKL3387-001	Power Bracket		1
51	VKL3395-001	Bec Arm		1
52	VKL5260-00A	Rec. Bracket Ass'v
53	VKW4363-001	Spring		\| i \|
54	VKW4364-002	Rec. Wire		1

Page 27

Ref. No.	⚠	Parts No.	Parts Name	Remarks	Q'ty
55		VMW4644-001	P.W. Board	Voltage Select SW	1
56		OSS2325-203BS	Slide Switch	KD-D30A/B/C/E/J	1
		" -203	"	KD-D30A/C/E/J	1
57		VMA4151-001		for V.S. Switch
58		QSR0084-001	V. Select Switch	KD-D30U	1
60	Δ	VKL4275-001	Bracket	"	1
61		VTP54C3-031BBS	Power Transformer	KD-D30B	1
		″ -031A ″ -032B	,
		VTP54U3-031B	"	KD-D30U	1
62	Â	QMP9017-008BS	Power Cord	KD-D30B	1
		QMP2560-200 OMP1200-200		KD-D30A KD-D30C/J	1
i		QMP3900-200	"	KD-D30E	1
		QMP7600-200	" Otherin Daliaf	KD-D30U	1
63		UHS3876-16285 ″-162		KD-D30A/C/E/J/U	1
64		VKC5160-001T	Tape Counter		1
65		VKL5258-001	Eject Lever		1
67		VKH4387-001 VKZ4001-011	Wire Holder		5
68		VKL5276-001	Lamp Holder		1
69	⚠	VGZ0001-006	Lamp Ass'y		1
70		T47818-002 VXP4258-001	Spacer Push Button	Rec. Mute	4
72		VKL5268-001	Bracket (A)		1
73		VKL5269-001	Bracket (B)	KD D2011	1
/4		PE2500	E Ping	Fiect Escutcheon	2
82		REE3000	L Thing "	Rec. Bracket x 1	2
		100000047			1
83		LPSP26042 SSSP26047	Screw	Door Bracket Ass'v	2
85		LPSP3006Z	"	Power Switch P.W.B. x 2	4
				V. Select SW x 2 (KD-D30U)
86		SDSF2606Z	" "	Tape Counter P W B	2
88		SDSP3006R	"	V. Select Switch	2
89		SDST2604Z	"	Mecha. Bracket	2
90		SDS126062		Blind X 2 Lamp holder X 1	3
91		SDST3006R		Rear Panel x 3	9
				Angle x 2
				Power Bracket x 1
92		SDST3006Z	"	Mecha. x 6	32

				Bottom Cover x 6
				Front Bracket (L) x 3
				Front Bracket (R) x 3
				Rec. Bracket x 1
				Power Transformer x 4
				P.W.B. x 3 Wire Holder x 2
93		SSST3006Z	"	Front Plate	3
94		SDST3008Z	Screw	Main P.W.B. x 5	11
				Fower Supply X 4 Transistor X 2
1	1 1

Page 28

Packing

Positions of controls and switch knobs at renew packing

Power switch	: OFF
NR system SWs	: OFF
Tape select SWs	: SF/NORM
Rec level controls	: MIN
Counter	: 000
Mecha. operation buttons	: OFF
Eject	: OFF
Rec Mute SW	: OFF

Fig. 18

Packing Material Parts List

Ref. No.	Parts No.	Parts Name	Remarks	Q'ty
1	VPD2100-J02	Carton	KD-D30B	1
	″ -JO3	"	KD-D30A	1 1
	″ -J04	"	KD-D30C	1
	″ -J05	"	KD-D30E	1
	″ -J06	"	KD-D30J	1
	″ -J07	"	KD-D30U	1
2	VPH3111-001	Cushion	Left	1
3	VPH3112-001	"	Right	1
	Q04141H	Wire Clamp	for Power Cord	1
	TKS000501-08	Sheet	for Unit	1
	VPE4002-005	Poly Bag	for Unit KD-D30B	1
	QPGA060-06005	Envelope	for Unit	1
			KD-D30A/C/E/J/U
	AP4056A-36	Poly Bag	for PIN Cord	1
4	VPE4002-004	"	for Inst. Book KD-D30B	1
	AP4056B-077	Envelope	for Inst. Book	1
			KD-D30A/C/E/J/U

Page 29

Accessories

A parts are safety assurance parts.

When replacing those parts, make sure to use the specified one.

Parts No.	Parts Name	Remarks	Q'ty
VMP0002-00B VNN0095-901 ~ -301 BT20013C BT20029B	Pin Cord Instruction Book Guarantee Certificate Warranty Card	KD-D30A/C/J/U KD-D30B/E KD-D30B KD-D30A	2 1 1 1 1
BT20025E BT20047 TJL000443-01	″ ″ Seal	KD-D30C KD-D30U/J KD-D30B (Made in Japan)	1
VNC5004-001 TLT052401-01	BEAB Label Mark Sticker Warning Label	KD-D30B KD-D30B/E KD-D30A/B/E for Dis Connection	1 1
QZL1002-003BS T44362-001 E66416-003	" CSA Marker Envelope	KD-D30B for 2 Pin Power Cord KD-D30C KD-D30J for Werenty Cord	1
BT20046A BT20046	Special Relay Card	KD-D30J KD-D30U	1 1
BT20044D TLT000505-01 E7795-1 VNC5311-101 V04062-001	Safety Instruction UL/CSA Caution Label EP Mark Caution Card Siemens Plug	KD-D30J " KD-D30U KD-D30U "	1 2 1 1 1
T46328-001 VND4037-001	Caution Label F. Mark Label	″ КD-D30Е	1

JVC KD-D30A, KD-D30B, KD-D30C, KD-D30E, KD-D30J SERVICE MANUAL

Contents

Specifications

Controls and Connections

Main Parts Location

Description of New Technology

Dolby C-type Noise Reduction System

Other developments

Safety Precautions

▲Safety mark

Removal of the Main Parts

Enclosure assembly parts

Mechanical assembly

Mechanical parts

Electrical parts

Dimensions

Main Adjustments

[I] Equipment and measuring instruments used for adjustment

1. Electrical adjustment

2. Mechanical adjustment

[II] Mechanical adjustment

[III] Electrical adjustments location

[IV] Electrical circuit adjustment procedure

Block Diagram

Recording System

Playback System

Power Supply and Mecha. Control Circuit

Wiring Connections

Power Supply P.W. Board Parts

Other P.W. Board Parts

Mechanical Component Parts

Mechanical Component Parts List

Enclosure Assembly and Electrical Parts List (Except P.W. Board Parts)

Packing

Packing Material Parts List

Accessories