Hitachi TRK 7800 E Service Manual

Page 1

TK No. T467E

COD HITACHI

SERVICE MANUAL TRK-78°°EIE(B$)

KEY TO ILLUSTRATIONS

BUILT-IN MICROPHONE(LEFT)
LED LEVEL INDICATOR

FM STEREO INDICATOR
BALANCE CONTROL

TONE CONTROL

VOLUME CONTROL
TELESCOPIC ANTENNAIAERIAL)
PAUSE BUTTON
FASTJORWARD/CUE BUTTON
REWIND/REVIEW BUTTON
PLAYBACK BUTTON

RECORD BUTTON
STOP/EJECT BUTTON

MODE SWITCH

FUNCTION SELECTOR

BAND SELECTOR

TUNING CONTROL

BUILT-IN MICROPHONE(RIGHT)
TAPE COUNTER

HEADPHONE SOCKET

TAPE SELECT SWITCH

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SPECIFICATIONS
GENERAL SECTION Intermediate Frequency: FM : 10.7 MHz
Semi-conductors: IC's: 9 SW/MW/LW ; 455 kHz
Transistors : 9 Antennas (Aeriais) : FM/SW Telescopic antenna
Diodes: 12 MW/LW BuIIt-In Iernte-core antenna
Vari-cap: 1 TAPE RECORDER
LED : 6 Tape : Cassette tape (C430, 60, 90)
Power(Mains)Suppiy 2 AC : 220V 50 Hz (For E) Tape Speed : 4.75cm/s
240V 50 Hz (For (B8)) Recording System and
DC: 9V(IEC R20X6 or equivalent) Bias Frequency: AC has 57 kHz
Power(Mains) Consumption :15W(E), 12W(BS) Erasing System : Quasi»AC erase
Dimensions : 265(H)><468(W)X152(D) Track System : 4 track 2 channel
Weight: 4.9kg (with batteries) Frequency Response : 50 to 10.000 Hz
Power output: 2.5W/CH(T.H.D10%)3i5W/CH M,P.O S/N (Signal to Noise Ratio): 45 dB
Speaker: 120mm 2.8 0th2 Wow and Flutter: 0.\% (WRMS)
30mm 4 Oth2 Distortion: 2%
TUNER SECTION Cross Talk : 60 dB (Between tracks)
Circuit System : FM/SW/MW/LW 4-band Erase Ratio : 60 dB
superheterodyne Input Sensitivity and
Tuning Range: FM :87.5 to 108 MHz Impedance: Microphone ~55 dB, 500 Ohms
SW :6 to 18 MHz Record/playbacHDlN) 22.5mV, 50K Ohms
MW: 530 to 1605 kHz Output Levl and Impedance: Record/playback(DIN) AOOmV, 6K Ohms
LW : 150 to 350 kHz Headphone 60 Ohms
Sensitivity 1 FM : 10 dB (ma) 0 dB (max.) Ext, speaker 3.2 Ohms
SW : 30 dB (pra.) 20 dBImaxJ Fast Forward or
MW 2 45 dB (pra.) 35 dBImax.) Rewinding Time: 120 sec. (Using C450)
LW : 55 dB (pra.) 40 dB (max) Motor: DC Micro Motor

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANG TO IMPROVEMENT

CASSETTE TAPE RECORDER WITH FM/SW/MW/LW RADIO

Dec. I980 TOKAI WORKS

Page 2

TRK-7800E,E(BS) I

SAFETY PRECAUTION

The following precautions should be observed when servicing.

1. Since many pans in the unit have special safetyrelated characteristics. always use genuine Hitachi's replacement
parts. Especially critical parts in the power circuit block should not be replaced with other makes.
Critical parts are marked with Ain the schematic diagram and circuit board diagram.

2. Before returning a repaired unit to the customer. the service technician must thoroughly test the unit to ascertain
that it is completely safe to operate without danger of electrical shock.

DISASSEM BLY
1. Cassette lid 2. Rear case
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