Technics SL-P110 - Page 24

* Check the power supply circuit
Check point @
Check the voltage of D19 terminal
(cathode).......8.9V
* Check the focus servo
Check the power supply circuit
Check point @ YES
y
Check the voltage of D22 terminal
(anode)....... ©9.3V
YES
Check point @ |
Check the voltage of Q11 terminal (emitter)
or CN401 4 pin.......8.5V
YES
Check point @
Check the voltage of Q12 terminal (emitter)
or CN401 3 pin......58.5V
Check point @ v YES
Check the voltage of Q13 terminal (collector)
or IC401 64 pin.....5V
Check point @ ¢ YES
Checkr the volitage of Q14 terminal (emitter)
or jumer wire.....Q5V
Check point @ ! YES
Check the voitage of Q15 terminal (emitter)
or IC801 26 pin.......6.5V
Check
point
@
¢
YES
Check the voltage of Q16 terminal (emitter)
or IC801 28 pin....... ©6.5V
Check point @ | YES
Check the voltage of IC401 8 pin....... 125V
YES
Check point (®
Check the voltage of 1IC401 4 pin.....©O12V
Check
point
@
|
YES
Check the voltage of Q17 terminal (emitter)
or {C401 38 pin....... ©32v
Check point ® 4 YES
Check the voltage of CN11 ), @....... AC 23V
— 24 —
NO AC cord Check point @ , YES
»
S1,T1,
defective
——
—
D19, 20 Reset signal is “H (4.2V)"? NO
(1C403 1 pin or IC401 13 pin) 1CAC
Check point @ YES
NO
|
p21
,
-
o
D22
defective
Clock
is
oscillated
(4.2336
MHz)?
NO
ICX
(IC401 63 pin) R40
Check point (B v YES
NO Ic11 . Focus ON signal level is “L (OV)'? NO 1CA(
> an defective | | 4c401 28 pin) IC1C
D11
L
Check point @ v YES
Laser A.P.C. signal is ON? NO IC1(
NO IC12 _ {Q101 collector or C124) Q10
> Q12 defective L
D12 Check point @ YES
Focus search signal is emitted ? NO
(IG101 35 pin or C119) 1C1
NO | ICc13 . —
Qi3 } defective | chock point @ l YES
Focus OK signal is “L (0V)”? NO 1C1(
(1C401 31 pin) 1C4(
NO | c402 . —
o } defective l YES
Focus lens moves up and down for a few NO IC1C
seconds? Qt4
NO | aQi5 ] (Not needed to set the disc) Pick
—> defective
D15 Check point ® ¢ YES
RF signal is emitted? NO | IC1C
(Test pin TJ301) Pick
NO | Q16
D16 defective
¢ Check the tracking servo
Check point @ ‘
NO D23 defective Check the TR ON signal (IC401 27 pin). NO IC1C
D24 “L” in play and “H” in search/skip. 1C4C
Check point @ y YES
NO D24 ) Tracking error signal is emitted? NO
*! D25 } defective (CN102 1 pin or 2 pin) 1IC1C
Check point é) , YES
Track jump pulse is emitted during NO
NO D1 h . -
> ng: gfig} defective search/skip? (IC101 20 pin or jumper wire) IC10
Check point @ y YES
’ Tracking coil drive signal is emitted? NO IC1C
NO
|T1
.
g
co
9
;
Q16
D18 defective (CN101 8 pin) Q16
e