Sharp 25MR15J, Руководство по обслуживанию, Страница: 12 / 26

12
25MR15J
DESCRIPTION OF SCHEMATIC DIAGRAM
NOTES:
1. The unit of resistance "ohm" is omitted.
(K = k
Ω
= 1000
Ω
, M = M
Ω
)
2. All resistors are 1/10 watt, unless otherwise noted.
3. All capacitors
µ
F, unless otherwise noted. (p = pF =
µµ
F)
4. (G) indicates
±
2% tolerance may be used.
VOLTAGE MEASUREMENT CONDITIONS:
1. All DC voltages are measured with VTVM placed between
points indicated and chassis ground, line voltage set at 120V
AC and all controls set for normal picture unless otherwise
indicated.
2. All voltages measured with 1000
µ
V input, B & W or Color signal.
WAVEFORM MEASUREMENT CONDITIONS:
1. Photographs taken on a standard gated color bar signal, the
tint setting adjusted for proper color. The wave shapes at the
red, green and blue cathodes of the picture tube depend on
the tint, color level and picture control.
2. indicates wave form check points (See chart, waveform
measured from point indicated to chassis ground.)
SAFETY NOTES:
1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BE-
FORE REPLACING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD BE REGARDED
AS POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS
IS OPERATING.
3. THE CHASSIS IN THIS RECEIVER IS HOT .(CONNECTED
TO ONE SIDE OF THE AC LINE) USE AN ISOLATION
TRANSFORMER BETWEEN THE LINE CORD AND POWER
RECEPTACLE, WHEN SERVICING THIS CHASSIS.
CIRCUIT PROTECTION
The entire receiver is protected by a 4.0A (F701) fuse,
mounted on PWB-A, that is wired into one side of the
AC line input.
WAVEFORMS FOR POINTS INDICATED
WAVEFORMS TAKEN WITH KEYED RAINBOW GENERATOR INPUT
S
AND SHADED COMPONENT: PRODUCT SAFETY
Chassis Waveforms