JVC KD-G501 Service Manual

1-28 (No.MA038)
5.6 Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to clean the lens
with a alcohol soaked cotton swab.
(2) Life of the laser diode
When the life of the laser diode has expired, the following
symptoms will appear.
• The level of RF output (EFM output: amplitude of eye
pattern) will be low.
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board
which is attached to the pickup is used to adjust the laser
power.Since this adjustment should be performed to match
the characteristics of the whole optical block, do not touch
the semi-fixed resistor.
If the laser power is lower than the specified value, the la-
ser diode is almost worn out, and the laser pickup should
be replaced. If the semi-fixed resistor is adjusted while the
pickup is functioning normally, the laser pickup may be
damaged due to excessive current.
5.7 Replacement of laser pickup
Is RF output
1.0 0.35Vp-p?
Replace it.
NO
YES
O.K
Turn off the power switch and,disconnect the
power cord from the ac outlet.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at TP1.
Finish.

JVC KD-G501 Specifications

Audio Amplifier Specifications

maximum power output front	50 W per channel
maximum power output rear	50 W per channel
continuous power output front	19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total harmonic distortion
continuous power output rear	19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total harmonic distortion
load impedance	4 Ω (4 Ω to 8 Ω allowance)
tone control range bass	±10 dB at 100 Hz
tone control range treble	±10 dB at 10 kHz
frequency response	40 Hz to 20 000 Hz
signal-to-noise ratio	70 dB
line-out level/impedance	2.0 V/20 kΩ load (full scale)
output impedance	1 kΩ

CD Player Specifications

operating voltage	DC 14.4 V (11 V to 16 V allowance)
allowable operating temperature	0°C to +40°C
dimensions installation size	182 mm × 52 mm × 150 mm
dimensions panel size	188 mm × 58 mm × 12 mm
mass	1.4 kg (excluding accessories)
frequency response	5 Hz to 20 000 Hz
dynamic range	96 dB
signal-to-noise ratio	98 dB
max. bit rate	320 Kbps

Tuner Specifications

frequency range FM	87.5 MHz to 108.0 MHz
frequency range AM (MW)	522 kHz to 1 620 kHz
frequency range AM (LW)	144 kHz to 279 kHz
usable sensitivity FM	11.3 dBf (1.0 µV/75 Ω)
50 dB quieting sensitivity FM	16.3 dBf (1.8 µV/75 Ω)
alternate channel selectivity (400 kHz) FM	65 dB
frequency response FM	40 Hz to 15 000 Hz
stereo separation FM	30 dB
capture ratio FM	1.5 dB
sensitivity MW	20 µV
selectivity MW	35 dB
sensitivity LW	50 µV