JVC NIVICO CD-1667 - User Manual

NivicoO
SERVICE MANUAL
Fig. 1
MODEL CD-1667 1667U
STEREO CASSETTE TAPE DECK
Dimensions:
12.0 (H) x 38 (W)
x 26.5 (D) cm
(4-3/8" x 14-15/16” x 10-7/16")
Weight:
4.6 kg (10 Ibs)
* In this Service Manual, frequency is indicated in Hz.
* In this tapedeck, ISO screws are used.
No. 4073
July, 1972
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Power source: AC 120V, 60Hz (CD-1667)
AC 100V, 110 ~ 120V, 200V, 220
~
230V
(50,
60H,
)
(1667U)
Fuse capacity: 1.8A, 0.8A
Power consumption: 30W (CD-1667)
15W (1667U)
Track system: 2-channel, 4-track
Cassette: C-60, C-90, C-120
Tape speed: 4.8cm/sec. (1-7/8ips)
Recording system: AC bias 95kHz
Erasure system: AC erasure
Recording time: 60 min. for double pass (C-60)
Fast forward time: 100 sec. or less (C-60)
Rewinding time: 100 sec. or less (C-60)
Transistors: 20 :
IC: 4
30 ~19,000Hz (Chrome-tape)
0.7mV, 10ka
20mV (Signal source
80ka)
80mV, 330ka
0.5V, 5ka
1V, 3.3ka
Diodes: 17
Frequency response:
Crosstalk: 60dB or more
S/N ratio: 50dB
Total harmonic 4% ot less
distortion :
rievhuracteriste! 1590uS, 120uS
Input: Microphone
DIN input
AUX. IN
Output: DIN
LINE OUT
Headphones
0.5mW/0.12mW, 82
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=
CD-1667, 1667U

Summary

Features

Names of Main Parts

Removal and Replacement of Main Parts

Construction and Disassembly

Details on how to take apart the main unit and its components.

Electrical Circuits

Procedures for removing and replacing various electrical circuit boards.

Mechanism Parts

Removing the Motor

Step-by-step guide for removing the motor from the mechanism.

Removing the Flywheel

Instructions for detaching and removing the flywheel assembly.

Removing the Plunger

Procedure for the removal of the plunger mechanism.

Replacement and Adjustment of the Heads

Replacing the Head

Instructions for removing and installing the record/playback and erase heads.

Azimuth Adjustment

Procedure to adjust the head azimuth for optimal stereo separation and clarity.

Main Adjustments

Adjusting the Needle Deflection of the Level Meters

How to calibrate the level meter needles for accurate visual feedback.

Input Level Adjustment

Adjusting input signal levels to prevent distortion and ensure proper recording.

Recording Bias Current Adjustment

Setting the bias current for optimal tape recording performance.

Mechanism Adjustment

Adjustments related to pinch roller pressure, take-up, and rewind torque.

Auto-Ejector

Theory of Detecting the Stop of Tape

Explanation of how the auto-eject mechanism detects the end of the tape.

Theory of Control Circuit Operation

Details on the circuit operation that controls the auto-eject function.

Operation of Mechanism

How the plunger and slide bar movement control the mechanism's operations.

Symptoms causes by operation theory of this mechanism

Common issues and their causes related to the auto-eject and control circuits.

Check-ups and Adjustments

Procedures for checking and adjusting the auto-eject mechanism and related circuits.

Noise Reduction System

Theory of the ANRS circuit

Explanation of the ANRS circuit's function in reducing tape noise.

Adjusting the ANRS Circuit

Connection Diagram

1. Amplifier Circuit Board & Tape Select Circuit Board

Wiring diagram for the amplifier and tape select circuit boards.

2. ANRS Circuit Board

Wiring diagram for the ANRS circuit board.

3. Input;Output Circuit Board

Wiring diagram for the input and output circuit board.

4. Power Source Circuit Board

Wiring diagram for the power source circuit board.

5. Eject Circuit Board

Wiring diagram for the eject circuit board.

6. Oscillation Circuit Board

Wiring diagram for the oscillation circuit board.

Block Diagram

Playback System Block Diagram

Diagram illustrating the signal flow during playback operation.

Recording System Block Diagram

Diagram illustrating the signal flow during recording operation.

Trouble Shooting

Cleaning and Oiling

Appearance Parts

Circuit Board Parts

1. Amplifier Circuit Board

Component layout and voltage points for the amplifier circuit board.

2. ANRS Circuit Board

Component layout and voltage points for the ANRS circuit board.

3. Power Source Circuit Board

Component layout and voltage points for the power source circuit board.

4. Oscillation Circuit Board

Component layout and voltage points for the oscillation circuit board.

5. Eject Circuit Board

Component layout and voltage points for the eject circuit board.

6. Input;Output Circuit Board

Component layout and voltage points for the input/output circuit board.

7. Tape Select Circuit Board

Component layout for the tape select circuit board.

Electrical Parts Except Circuit Board

1. Chassis Front

Identification of electrical parts located on the front chassis assembly.

2. Chassis Rear

Identification of electrical parts located on the rear chassis assembly.

Mechanical Parts

1. Chassis

Diagram showing the main chassis assembly and its mechanical components.

2. Head Panel

Diagram illustrating the head panel assembly and its mechanical parts.

3. Chassis Rear

Diagram showing mechanical components on the chassis rear assembly.

JVC NIVICO CD-1667 Specifications

General

Track System	4-track, 2-channel stereo
Wow and Flutter	0.08% (WRMS)
Dimensions	420 x 110 x 274mm
Weight	5.7kg
Channels	2
Type	Stereo cassette deck
Heads	1 x Record/Playback, 1 x Erase