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JVC HRS7800U
Service Manual


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  • Contains Circuit Diagrams
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  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of JVC HRS7800U Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 13 (click to view)
3.5.8 Sub DET [HR-S6700KR]
Signal Mode Equipment Adjustment part Specified value Adjustment tool (A) (B) (C) (F) (G) (H) • RF signal (sound carrier: S2) • Tuner • EE • Audio level meter • IC1501 pin 26 • T1501 (SUB DET) • Minimum distortion • LPF (30 kHz), HPF (400 Hz)

3.6 SYSCON CIRCUIT Note: • When perform this adjustment, remove the Mechanism assembly. 3.6.1 Timer clock
Signal Mode Equipment (A) (B) (C) • No signal • EE • Frequency counter • IC3001 pin61 • IC3001 pin24 • C3026 + and – • C3025 (TIMER CLOCK) • 1024.008 ± 0.001 Hz (976.5549 ± 0.0010 µsec)

Measuring point (D)

(1) Set the sound carrier of the RF signal generator to S2. (2) Connect the adjustment tool (H) to the measuring point (D). Then connect the equipment (C) to the adjustment tool (H). (3) Adjust the Adjustment part (F) so that the distortion level of the measuring point (D) becomes the specified value (G). 3.5.9 Pilot VCO [HR-S6700KR]
Signal Mode Equipment (A) (B) (C) • No signal • Tuner • EE • Frequency counter • IC1501 pin 11 • C1510 (+) terminal • C1510 (–) terminal • VR1502 (PILOT VCO) • 210 ± 5 Hz

Measuring point (D1) Short point (D2) (D3) Adjustment part (F) Specified value (G)

Measuring point (D1) Short point (D2) (D3) Adjustment part Specified value (F) (G)

(1) Connect the frequency counter to the measuring point (D1). (2) Connect the short wire between the short point (D2) and Vcc (5V). (3) Short the leads of capacitor (D3) once in order to reset the microprocessor of the SYSCON. (4) Disconnect the short wire between the short point (D2) and Vcc then connect it again. (5) Adjust the Adjustment part (F) so that the output frequency becomes the specified value (G).

(1) Connect the short wire between the short points (D2) and (D3). (2) Connect the equipment (C) to the measuring point (D1). (3) Adjust the Adjustment part (F) so that the frequency of the measuring point (D1) becomes the specified value (G). (4) Disconnect the short wire between the short points (D2) and (D3). 3.5.10 Separation [HR-S6700KR]
Signal Mode Equipment Adjustment part Specified value Adjustment tool (A) (B) (C) (F) (G) (H) • Sweep generator output (90 dB, 1 kHz) • EE • Oscilloscope • IC1501 pin 19 • VR1501 (SEPARATION) • Minimum level • Sweeper probe (See Fig. 3-5-10a.)

Measuring point (D)

Shorter than 8 cm

Shield

C : 1000 P R : 75Ω Earth

Out

Shorter than 5 cm

Fig. 3-5-10a

Sweeper probe

(1) Use the adjustment tool (H), supply 1 kHz R-only modulated IF signal to IF terminal of U/V tuner (front end). (2) Connect the equipment (C) to the measuring point (D). (3) Adjust the Adjustment part (F) so that the output level of the measuring point (D) becomes the specified value (G). 3-7

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