Self Diagnostics - Zenith XBV243 Service Manual

SELF DIAGNOSTICS

SELF DIAGNOSTIC OVERVIEW
Provides service personnel a convenient service aid by a
visual display of error codes generated by the
microcomputer and displayed on the digitron.
OPERATIONAL PROCEDURE
With the remote control, press and hold the "MENU" key
until the word MENU appears in the display. Then press
4, 3, 2, 1 and then "ENTER". The self diagnostic procedure
will sequence through the 8 step procedure. If an error
is detected, a code number will flash approximately 5
times and then return to its initial mode of operation.
DISPLAY DESCRIPTION
"D1" •Tape Loading
Error
"D2" •Tape Loading
Error
"D3" •CST Loading
Error
"D4" •CST Loading
Error
"D5" •DRUM Motor
Error
"D6" •Reel Rotational
Error
"D7" •Capstan Motor
Error
"F1" •Tuner Signal
Input
VCR should be in PB mode for D5, D6 and D7. Stop mode for F1, cassette loading D3, D4 and tape loading D1 and D2.
VR168 - 923-03485
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CHASSIS
NOTES
1. Error codes will not be stored. The program must be
2. Pin numbers refer to IC501 microcomputer, unless
INPUT SIGNAL
•Mode SW Position not
•Mode SW
changed within 6 seconds
Pos. S1, S2, S3, S4
after cassette loading
Pins: 25, 24, 23, 22
attempt.
•Load Motor
Pins: 60 (+)
Pins: 59 (-)
•Mode SW Position not
•Mode SW
changed within 6 seconds
Pos. S1, S2, S3, S4
after cassette loading
Pins: 25, 24, 23, 22
attempt.
•Load Motor
Pins: 60
•Mode SW Position not
•Mode SW
changed within 6 sec-
Pos. S1, S2, S3, S4
onds after cassette
Pins: 25, 24, 23, 22
loading attempt.
•Load Motor
Pins: 60
•CST SW must be activat-
•Mode SW
ed within 3 seconds, oth-
Pos. S1, S2, S3, S4
erwise unit shut down will
Pins: 25, 24, 23, 22
occur.
•Load Motor
Pins: 60
•Drum Motor (Slow Start)
•Head SW(30Hz)
•Motor must be up to
Pulses Pin18
speed within 3 seconds
of operation
•CFG Signal present, but
•Supply Take-up Reel
take-up pulses are mis-
Pulses, Pins 79, 80
sing.
(Capstan motor running)
•No CFG Signal
•Capstan FG Pulses
•Composite Sync not
•CVin Pin 56
detected, RF or Video
Signal loss.
2-2
re-initialized as described in the preceding step.
otherwise stated.
CIRCUIT STATUS
•Loading motor,
mech problems,
gears, timing
•Mode SW Position
•Mode SW Contacts
•Mode SW Contacts
•CST SW or
Connector Contacts
•Drum Motor and
Control Circuits
•Capstan belt
•Idler and reel gears
damaged
•ST/U Sensors
•Capstan control ckt.
•Motor assy.
•IC501 Ckt.
•Loss of C-sync
Tuner Line
Video Path
SERVICE POINTS
D35E COMBO - CHASSIS