JVC XV-1000BK, Service Manual

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(5) Focus balance coarse adjustment NG (This error rarely occurs.)
* Mechanical unit is defective.
Although focusing is executed normally, blooming occurs if vibrated during coarse adjustment.
* Periphery of driver is defective.
. Due to cold soldered or short-circuited resistor, capacitor, etc., of the gain setting
section, gain becomes too large, and blooming occurs when vibrated.
. BTL offset occurs due to defective driver IC.
(Compare DC voltage of CN101"20" and "21" during stop.)
. IC301 is defective. Is W002 (TP252) at approx. 2.5V during stop?
(6) Phase difference cancel adjustment NG (This error rarely occurs.)
* Same as above (5). Periphery of the driver for the tracking system is defective.
* Mechanical unit is defective.
Blooming occurs if vibrated in the direction of tracking.
* Driver IC
Compare DC voltage of CN101"20" and "21" during stop.
* IC301 is defective.
Is W001 (TP251) at approx. 2.5V during stop?
(7) Tracking balance adjustment NG (This error rarely occurs.)
* Check the same as (6) above.
* Is TE sent? (TP106)
This error does not occur in relation with the adjustment value of "5" to "7".
This error basically occurs only when abnormality such as blooming occurred during adjustment.
(8) Tracking ON NG
* Mechanical unit is defective.
Cannot retract normally due to abnormal adjustment value of "5" to "7".
* Periphery of driver (IC251)
Constant or IC itself is defective.
(When passed without entering abnormal condition in the adjustment of "5" to "7")
* Servo IC (IC301)
When improperly adjusted due to defective IC ("5" to "7")
(9) Spindle 1 8T mode NG
* Is RFAS3 input to IC201 (R-CH)? (Voltage from IC101"64" is divided and input through coupling
capacitor.) CN301"1"
* IC201 Is signal output from TP206 and TP207 (AGC OUT)?
* IC201 Is signal output from TP204 and TP205 (EQ OUT)?
* IC201 Is signal output from "27" (RDCK) and "28" (SRD) (binary-coded clock and data)?
* IC201 Is "2" (TRON) at "H" level? (Reverse logic for CD)
* IC201 Is "3" (XRFOK) at "L" level?
* IC201 "9" to "12" Is signal output to IC301"43", "44", "47" and "48"?
(Serial communication of rotation information)
* Spindle motor driver is defective.
Even when one of the three phases is defective, item (2) may be passed.
Check the second item in (2) above.
* C259 to C261, C271 Defective soldering
If noise eliminating capacitors are not properly soldered, noise may ride on the waveform.
(10) Focus balance fine adjustment NG
Basically, when above (1) to (9) are OK, this error does not occur.
Though rarely, this error occurs if blooming does not occur in above (5) to (7) but occurs in
this step.