Troubleshooting; Overview; Error Indications; Camera Has No Power - Epson PhotoPC 850Z Service Manual

EPSON PhotoPC 850Z

3.1 Overview

3.1.1 Error Indications

PhotoPC 850Z has a function to indicate an error with LED as shown in the
table below, but it does not indicate the detailed cause of the error.
Table 3-1. Error Indications
Camera Shooting
Condition Condition
(Green) (Red)
Blinks with an
Battery Out
interval of 0.1 sec.
Error
Several different malfunctions can be found from the same symptom.
Therefore, follow the check points in the order shown in this chapter, and
perform proper repair service.


Before disassembling the camera, make sure that
batteries are removed or the AC adapter is disconnected
from the plug.


Electrolytic capacitor (C5412) mounted on the PW1 Board
is for flash emission. This capacitor is charged
automatically every time the power is turned on. Since
there is a possibility of getting electric shock during the
service operation, discharge the electricity by using the
cement resistance if you need to touch the capacitor for
repair service (see Chapter 4 "Disassembly and
Assembly" for details).

Troubleshooting

Shooting Self-Timer
Condition Condition
(Green)
On
3.2 Trouble Shooting
This section shows the procedure for checking malfunctioning unit or parts by
each abnormal symptom.

3.2.1 Camera Has No Power

Nothing is indicated on the LCD or red LED keeps blinking, and the camera
does not go into the stand-by state even if the dial switch is turned on after
installing batteries or connecting the AC adapter. In this case, refer to
Table 3-2 ~ 3-4.
(Red)




Table 3-2. Check points when the camera has no power
Checking
Order
Check 91-pin (SCAN IN 0)
1
pulse input of IC301.
Check 7-pin (UNREG) pulse
2
input of IC302.
Check 81-pin (VDD) pulse
3
input of IC301.
Check 84-pin (/RESET) pulse
4
input of IC301.
Check 80-pin (/BAT OFF)
5
pulse input of IC301.
Overview
If the 8-bit micro processor, which controls User I/F,
located on the SY1 Board has a problem, the signal
necessary to generate the various digital and analog
power source will not be generated. As a result, the
camera goes into "No Power" state.
Also, since this 8-bit micro processor performs serial
communication with the main CPU on the CA2 Board, if
trouble occurs on the CA2 Board, the same symptom as
above will appear.
Check Point Judgement
NO
LOW
LOW
LOW
LOW
Revision A
Solution
Check CN301, R3021,
and the harness
including the power
switch.
Check PW1 and CA2.
Check IC302.
Check IC302 and R3051.
Check R3052.
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