Pioneer PL L50 Service Manual

Page 1

CIRCUIT DESCRIPTIONS

REPAIR & ADJUSTMENTS , ' , - ORDER NO.
AR P- 685-0
STEREO TURNTABLE
MODEL PL-L50 COMES IN SEVEN VERSIONS DISTINGUISHED AS FOLLOWS:
Type Voltage I Remarks
KU Ac1zov only i USA. model
KUT AC120V only I U.S.A. model without cartridge
KCT ACIZOV only Canada model without cartridge
HEM AC220V, 240V (switchable) European continent model
HB Ac220v, 240v (switchable) United Kingdom model
8 AC110V, 120v, 220v, 240v (switchable) General export model
SIG Acnov, 120v, 220v, 240v (switchable) us. Military model
0 This service manual is applicable to the KU, KUT, KCT, HB, HEM, S and 8/6 types.
0 As to the KUT, KCT, HEM, HB, S and 8/6 types please refer to pages 47 - 48.
0 Ce manual d'instruction se refére au mode de réglage, en frangais.
O Este manual de servicio trata del método de ajuste escrito en espafiol.
I. SAFETY INFORMATION ................. 2 10. P.C. BOARDS CONNECTION DIAGRAM ..... 26
2. SPECIFICATIONS ...................... 3 11. SCHEMATIC DIAGRAM ................. 29
3. FRONT PANEL FACILITIES ............... 4 12. ELECTRICAL PARTS LIST ............... 32
4. BLOCK DIAGRAM ..................... 5 13. ADJUSTMENTS ...................... 34
5. CIRCUIT DESCRIPTIONS ................. 7 REGLAGE .......................... 36
6. DISASSEMBLY ....................... 17 AJUSTE ............................ 38
7. PARTS LOCATIONS ................... 20 14. TROUBLESHOOTING .................. 40
8. EXPLODED VIEW AND PARTS LIST ........ 22 15. SUPPLEMENT FOR KUT, KCT, HEM, H8,
9. PACKING ........................... 25 S AND S/G TYPES ..................... 47

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1»Chome, Meguro-Ku. Tokyo 153, Japan
moussn ELECTRONICS [UBA] INC. PO. Box 1780, Long Beach, California 90801 USA.

TEL: [BOD] 421-1404. [BOD] 237-0424
moussn ELECTRONIC [EUROFE] N.V. Kaacaanglaan 1, 2740 savarari Belgium TEL: 022/775-2305
mousse: ELECTRONICS AUSTRALIA raw. LTD. 178-184 Boundary naaa, Braeside, Victoria 3195, Australia

TEL: 03 580-9911
I I FZ © NOV. 1984 Printed in Japan

Page 2

1. SAFETY INFORMATION

LSAFETY PRECAUTIONS
The following check should be performed for the

continued protection of the customer and service tech-

nician.
LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage current
tester such as Simpson Model 229-2 or equivalent between
the earth ground and all exposed metal parts of the appli-
ance (input/output terminals, screwheads, metal overlays,
control shaft, etc.). Plug the AC line cord of the appliance
directly into a 120V AC 60Hz outlet and turn the AC
power switch on. Any current measured must not exceed
0.5mA.

Reading should
not be above

Leakage

Device current 0.5mA
under tester
test
Test all
é§7 exposed metal

surfaces
24mm cord
9'Also test with . .
plug reversed . Earth
(Using AC adapter ground

plug as required)

AC Leakage Test

ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A P0-
TENTIAL SHOCK HAZARD AND MUST BE COR-
RECTED BEFORE RETURNING THE APPLIANCE
TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are often
not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety charac-
teristics are identified in this Service Manual.

Electrical components having such features are identified

by marking with a A on the schematics and on the parts
list in this Service Manual.
The use of a substitute replacement component which
dose not have the same safety characteristics as the
PIONEER recommended replacement one, shown in the
parts list in this Service Manual, may create shock, fire,
or other hazards.

Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER Service
Manual. A subscription to, or additional copies of, PIONEER
Service Manual may be obtained at a nominal charge from
PIONEER.