Jvc MF 1845 L Service Manual

Page 2

Index

Specifications . ..

Features ...............
The Name of External Parts . .
Parts List of Record Player . . . . . . . . .......... 4
Location of Circuit Board . ................... 4
Disassembly Instruction . . . . . . . . . . 5
Main Parts Removing ........................ 6
Removal of Mechanical Parts .................. 7
TunerAlignment............................. 8
Cassette Deck Alignment ....................... 10
Replacement and Adjustment of the Head . 10
ReplacingtheHead 10
AzimuthAdjustrnent.............. ..... .....10
Mechanism Adjustment . ....................... 11
Replacement and Adjustment of the Record Player . . 12

Troubleshooting .
Cassette deck section . . .
Record player section . . . .

To String Dial Cord . . ......................... 14

Block Diagram . .

Circuit Board Parts .

PowerAmp. ......
'Power Amp. Parts List ....................... 17
Rec/PBAmp...... 18

Rec/PB Amp. Parts List ...................... 19

Specification

CASSETTE: Sensitivity:

Type: Stereo Cassette Deck with ID Total harmonic
Mechanism and Automatic Stop distortion:

Track system: 4-track, 2-channel stereo S/N ratio:

Page
Tuner ............................. ......21
TunerPartsList........... ................. 22
Control Amp. ....................... . . . . . . 24
ControlAmp.PartsList.............. ....... 25
AutoStop ........................... 27
Auto Stop Parts List . . . . . . . 27
Fuse ........ ............... 28
Lever Switch . ............................. 28
Din Jack .......................... . . 28
FusePartsList ..... .. . ....... 29
Lever Switch Parts List .
Din Jack Parts List .........................
Push Switch .......................... . . . . . 30
Ant. Parts L

Cds Parts List
Mechanical Components .

Mechanical Component List .................... 33
Record Player Components ..................... 34
Record Player Component List .................. 34
Assembly Parts Except Enclosure Parts ......... . . . 35
Assembly Parts List ................ . .

Packing ........... .......... 36
Wiring Diagram . . . . . . . ....................... 37
Standard Schematic Diagram .................... 38

2,7»V lS/N: ZSdB) Image rejection:
AMPLIFIER
Continuous power

(both channels

45dB (340kHz)

0.6% (98MH2)
55dB (MONO)

Bias & erase: Ac bias (57kHZ), Capture ratiO: 3.5dB (98MHZl driven at 1kHz): 15 watts RMS at 4 ohms
AC erase (57kHz) Stereo separation: 35dB (1kHz) (1%distortion) per channel
Heads: Cronios head for Record/Play Frequency Music power
Ferrite head with double gap response: 30 - ,5sz at 1kHz; 20 watts at 4 ohms
for Erase lF rejection: 70dB (1% distortion) per channel
Frequency Image rajection: 53dB (98MH2) Power bandwidth: 30Hz - 20kHz
response: (Normal) 30 - 13,000Hz AM suppression: 48dB (98MHZ) (1% distortion, 4 ohms load)
(Chrome) 30 - 15,000Hl MW TUNER: Tone controls: Bass tlodB at 100H2
S/N ratio: Better than 50dB Antenna: Ferrite bar Treble ilOdB at lOkHz
(from peak level) Tuning range: 540 -1,600kHz Load impedance: 4 ohms
Wow and flutter: 011% WRMS Sensitivity: 400uV/m (S/N: ZOdB) TURNTABLE:
Crosstalk: SSdB (lkHZ) Total harmonic Motor: 4-pole Synchronous Motor
Channel distortion: 1.5% (EmV/m) Turntable speeds: 33-1/3, 45 rpm
separation: soda (lkHz) SIN ratio. 45dB (5mV/m) Platter diameter: 11 inches (28cm)
Total harmonic lF rejection: 35dB (SOOkHz) Drive system: Beltdrive
distortion: . 29in llkHl, Normal tapE) Image rejection: 42dB (1,400kHz) Cartridge: Moving Magnet
Fastforward time: Within 125 sec. ((2-60) LW TUNER (L model): Stylus: Diamond (DT-33H)
Rewnnd ime: WM) 125 55° (060 Antenna: Ferrite bar GENERAL:
TUNER: Tuning range: 150 7 350kHz Power source: 220V, 50Hz
TYPE= FM/MW/LW Stereo Tuner Sensitivity: 1,000uV/m (S/N: zode) Power
(L model) Total harmonic consumption: 130 watts
FM TUNER: distortion: 2% (5mV/m) Dimensions: 500(W) x 193lH) x 438lD)mm
Antenna: 300 ohms balanced s/N ratio: 40dB (1mV/m) (19~3/2 x 7-8/5" x 1745/3")
Tuning range: 88 - 108W!Z lF rejection: sous (340kHz) Weight: 16kg (35.2lbs.)

MF-1845L
No. 2361