Repair Quality Assurance - Canon A-1 Repair Manual

used in the correct camera. Lubrication is also dif-
ferent from the
~-l.
6.7 The A-I is a system camera. Interchangeability and correct
operation with accessories must be considered when
repairing it.
6.8 The viewfinder screen is interchangeable by service.
When it is changed, always chec!, the infinity focus and
exposure.
6.9 Much information is presented in digital form in the
viewfinder, and it is different for each mode of operation.
If the imformation presented in all different modes is
not thoroughly understood, answering inquiries, especially
over the telephone, is difficult and may lead to more
confusion.
6.10 Repair Quality Assurance
(1) Shutter Speed is adjusted by
varyi~g
the count start
(CTST) timing with variable resistor VRT.
(Shutter Speed Tester is necessary)
(2) Flange Focal Distance is adjusted to 42.14 mm using
the Glass gage and me asuring at the four corners.
(3) The "finder back" is adjusted to 42.03 mm using the
standard lens.
(4) Exposure accuracy is adjusted by the SPC output using
the Bus Checker tool to check the I Bus. It is then
confirmed using the EE Camera Tester. If exposure
accuracy is not wi t h i n the proper limits, check the
diaphragm and MGl release operation with the oscillo-
scope. (If the AE Evaluation Standard Lens is
available, check the diaphragm operation with it,)
(5) Check the 0 BUS output from the CPU to the decoder
driver against the a ctual display in the viewfinder
using the Bus Checke r tool. (I Bus inputs to the CPU
must be correct as a precondit~on.)
(6) Inputs to CPU are checked with the Bus Checker tool.
(7) To adjust the ASA (SV) brush, the SV Check Bit tool
is used. The top cover provides the positioning pin
for the SV Check Bit tool.