Pioneer kehp 4250 service manual

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GD PIONEER

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S ervice

ORDER NO.

CRT1 629

MULTl-CD CONTROL FM/AM TUNER DECK AMPLIFIER

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MULTI-CD CONTROL FM/MW/LW TUNER DECK AMPLIFIER
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NOTE:
0 See the separate manual CX-197 (CRT1328I for the cassette mechanism description.
O The cassette mechanism employed in this model is one of 1M mechanism series.
CONTENTS
CHAPTER 1 CHAPTER 2
1. SPECIFICATIONS .................................................... 1-2 1. PACKING METHOD ................................................. 2-2
2. OPERATION AND CONNECTION ........................... 1-3 2. CIRCUIT DIAGRAM AND PATTERN
3. DISASSEMBLY ...................................................... 1-12 2.1 TUNER AMP UNITIKEH-P4200/UC,P4250/ES)...2-5
4. ADJUSTMENT ...................................................... 1-13 2.2 TUNER AMP UNIT(KEH-P4110/EE) .................. 2-10
5. ERROR NUMBERS AND NEW TEST MODE ....... 1-17 2.3 TUNER AMP UNITIKEH-PZO/EW,P10/EW) ....... 2-15
6. ELECTRICAL PARTS LIST ..................................... 1-23 2.4 CASSETTE MECHANISM ASSY ....................... 2-20
2.5 FM/AM TUNER UNIT
(KEH-P4200/UC,P4250/ES} ................... - ........... 2-21
2.6 TUNER UNITIKEH-P41IO/EE) ............................ 2-25
2.7 FM/AM TUNER UNITIKEH-PZO/EW,P10/EW}...2-29
2.8 KEY BOARD UNIT ............................................. 2-33
3. CHASSIS EXPLODED VIEW ................................. 2:37
4. CASSETTE MECHANISM ASSY
EXPLODED VIEW .................................................. 2-40
5. BLOCK DIAGRAM ................................................. 2-44

_-_.-. a.-

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, California 90801 USA.

PIONEER ELECTRONICS OF CANADA, INC. 300 Allstate Parkway Markham,0ntario L3H 0P2 Canada

PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1 9120 MelseIe Belgium

PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178- 184 Boundary Road, Braeside, Victoria 3195, Australia TEL: [031580- 9911

© PIONEER ELECTRONIC CORPORATION 1994 mm NOV. .994 Printed in Japan

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KEH--P4EDD,P4250,P4110,PED,PID

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CHAPTER 1 -__m__ -
SAFETY INFORMAT 0N (UC MODEL)
QAUTION

This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer.
Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair
complex products such as those covered by this manual.

Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty.
If you are not qualified to perform the repair of this product properly and safely; you should not risk trying to do so and
refer the repair to a qualified service technician.

WARNING

Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxi-
cant which may cause birth defects or other reproductive harm (California Health 81 Safety Code, Section 25249.5).
When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin
contact with the solder. Also, when soldering do not inhale any smoke or fumes produced.

1 . SPECIFICATIONS

General FM tuner
Power source ................ 14.4 V DC (10.8 -15.6 V allowable) Frequency range(UC) .......................... 87.9 ~- 107.9 MHz
Grounding system ................................ Negative type Frequency range(EW,ES) ........................ 87.5 - 108 MHz
Max. current consumption ................................. 8.5 A Frequency range(EE) ............................... 65 - '74 MHz
Dimensions ............................ 87.5 --- 108 MHz
(DIN) (mounting size) ........... 178 (W) x 50 (H) x 150 (D) mm Usable sensitivity ......... 11 dBf (1.0 (JV/75 Q, mono, S/N: 30 dB)
[7 (W) x 2 (H) x 5-7/8 (D) in.] 50 dB quieting sensitivity ............. 16 dBf (1.7 (JV/75 Q, mono)
(nose) ...................... 188 (W) x 58 (H) x 19 (D) mm Signal-to-noise ratio ....................... 70 dB (lHF-A network)
[7-3/8 (W) x 2-1/4 (H) x 3/4 (D) in.] Distortion ......................... 0.3 % (at 65 dBf, 1 kHz, stereo)
(D) (mounting size) .............. 178 (W) x 50 (H) x 155 (D) mm Frequency response ...................... 30 -15,000 Hz (:3 dB)
[7 (W) x 2 (H) x 6-1/8 (D) in.) Stereo separation ........................ 40 dB (at 65 dBf, 1 kHz)
(nose) ...................... 170 (W) x 48 (H) x 14 (D) mm Selectivity .............................. 70 dB (2ACA) (1400 kHz)
[6-3/4 (W) X 1-7/8 (H) X 1/2 (D) in.) Three-signal intermodulation (desire signal level)
Weight ........................................... 1.3 kg (2.9 lbs) .................... 50 dBf (two undersire signal level: 110 dBf)
Amplifier AM tuner
Continuous power output is 15 W per channel min. into 4 ohms, Frequency range(UC,ES) ........................ 530 "1,710 kHz
both channels driven 50 to 15,000 Hz with no more than 5 % THD. Frequency range(EW,EE,ES) .................... 531 -- 1,602 kHz
Maximum power output ......................... 35 W x 4 (EiAJ) Usable sensitivity ..................... 18 (N (25 dB) (S/N: 20 dB)
Load impedance ......................... 4 Q (4 -8 Q allowable) Selectivity ....................................... 50 dB (:10 kHz)

Preout output level/output impedance

................................................. 500 mV/1 k9 These specifications were determined and are presented in accor-
Tone co ntrois (bass) .................... . ......... :10 dB (100 Hz) dance with specification standards established by the Ad Hoc
(treble) ............................ 3:10 dB (10 kHz) Committee of Car Stereo Manufacturers.
Loudness contour ................ +10 dB (100 Hz). +7 dB (10 kHz)

(Volume: -30 dB)

Note:
Specifications and design are subject to possible modification

Tape player without notice due to improvements.
Tape ....................... Compact cassette tape (C-30 - C-90)
Tape speed ............. 4.46 cm/sec. (+0.14.cm/sec.,-0.050m/sec.)
Fast forward/rewind time ............... Approx. 100 sec. for 060
Wow 81 flutter ................................... 0.13 % (WRMS)
Frequency response ....................... 40 - 14,000 Hz (:3 dB)
Stereo separation ......................................... 45 dB
Signal-noise ratio ......................... 52 dB (iHF-A network)